Hi all,
This is another version of the driver. Note that the driver changed
significally and is a more simply because now is using the panel_bridge
helpers. Apart from this, I addressed the comments from Maxime, Laurent
and Ezequiel.
This bridge is required to have the embedded display working on an Acer
Chromebook R13 ("Elm"). Hopefully we are a bit more close to have this
driver merged. If more changes are required, please let me know and I
will work on it.
Note: Along these around 20 revisions of this driver I was unable to
reconstruct the full changelog history, so I'm skipping this. Sorry
about that, I promise I'll maintain the changelog for future revisions.
Thanks,
Enric
Changes in v23:
- Merge mute/unmute functions into one (Nicolas Boichat)
- Use enum for ENABLE/DISABLE instead of bool (Ezequiel Garcia)
- Rename mute/unmute to vdo_control and fix error messages (Nicolas Boichat and Enric)
- Add space between address and address parameter 'address%02x' (Nicolas Boichat)
- Add Tested-by Hsin-Yi
- Added me as author after the refactor
Changes in v22:
- Migrate to YAML format (Maxime Ripart)
- Remove mode-sel property.
- Rename sleep-gpios to powerdown-gpios.
- Remove sysfs attributes because are not really used (Enric Balletbo)
- Use enum for address page offsets (Ezequiel Garcia)
- Remove enable tracking (Enric Balletbo)
- Use panel_bridge API (Laurent Pinchart)
- Do not use kernel-doc format for non kernel-doc formatted commands (Enric Balletbo)
- Remove verbose message for PAGE1_VSTART command (Ezequiel Garcia)
- Use time_is_after_jiffies idiom (Ezequiel Garcia)
- Remove unused macros (Ezequiel Garcia)
- Fix weird alignment in dsi->mode_flags (Laurent Pinchart)
- Use drm_of_find_panel_or_bridge helper (Laurent Pinchart)
- Remove mode-sel-gpios as is not used (Laurent Pinchart)
- Remove error messages to get gpios as the core will already report it (Enric Balletbo)
- Remove redundant message getting the regulators (Laurent Pinchart)
- Rename sleep-gpios to powerdown-gpios (Laurent Pinchart)
- Use ARRAY_SIZE(ps_bridge->page) instead of MAX_DEV when possible (Laurent Pinchart)
- Fix race with userspace accessing the sysfs attributes (Laurent Pinchart)
- Remove id_table as is only used on DR platforms (Laurent Pinchart)
- Convert to new i2c device probe() (Laurent Pinchart)
- Use i2c_smbus_read/write helpers instead of open coding it (Laurent Pinchart)
- Remove unnused global variables (Laurent Pinchart)
- Remove unnused fields in ps8640 struct (Laurent Pinchart)
- Remove commented-out headers (Laurent Pinchart)
Changes in v21:
- Use devm_i2c_new_dummy_device and fix build issue using deprecated i2c_new_dummy
- Fix build issue due missing drm_bridge.h
- Do not remove in ps8640_remove device managed resources
Changes in v19:
- fixed return value of ps8640_probe() when no panel is found
Changes in v18:
- followed DRM API changes
- use DEVICE_ATTR_RO()
- remove firmware update code
- add SPDX identifier
Changes in v17:
- remove some unused head files.
- add macros for ps8640 pages.
- remove ddc_i2c client
- add mipi_dsi_device_register_full
- remove the manufacturer from the name and i2c_device_id
Changes in v16:
- Disable ps8640 DSI MCS Function.
- Rename gpios name more clearly.
- Tune the ps8640 power on sequence.
Changes in v15:
- Drop drm_connector_(un)register calls from parade ps8640.
The main DRM driver mtk_drm_drv now calls
drm_connector_register_all() after drm_dev_register() in the
mtk_drm_bind() function. That function should iterate over all
connectors and call drm_connector_register() for each of them.
So, remove drm_connector_(un)register calls from parade ps8640.
Changes in v14:
- update copyright info.
- change bridge_to_ps8640 and connector_to_ps8640 to inline function.
- fix some coding style.
- use sizeof as array counter.
- use drm_get_edid when read edid.
- add mutex when firmware updating.
Changes in v13:
- add const on data, ps8640_write_bytes(struct i2c_client *client, const u8 *data, u16 data_len)
- fix PAGE2_SW_REST tyro.
- move the buf[3] init to entrance of the function.
Changes in v12:
- fix hw_chip_id build warning
Changes in v11:
- Remove depends on I2C, add DRM depends
- Reuse ps8640_write_bytes() in ps8640_write_byte()
- Use timer check for polling like the routines in <linux/iopoll.h>
- Fix no drm_connector_unregister/drm_connector_cleanup when ps8640_bridge_attach fail
- Check the ps8640 hardware id in ps8640_validate_firmware
- Remove fw_version check
- Move ps8640_validate_firmware before ps8640_enter_bl
- Add ddc_i2c unregister when probe fail and ps8640_remove
Jitao Shi (2):
Documentation: bridge: Add documentation for ps8640 DT properties
drm/bridge: Add I2C based driver for ps8640 bridge
.../bindings/display/bridge/ps8640.yaml | 112 ++++++
drivers/gpu/drm/bridge/Kconfig | 11 +
drivers/gpu/drm/bridge/Makefile | 1 +
drivers/gpu/drm/bridge/parade-ps8640.c | 348 ++++++++++++++++++
4 files changed, 472 insertions(+)
create mode 100644 Documentation/devicetree/bindings/display/bridge/ps8640.yaml
create mode 100644 drivers/gpu/drm/bridge/parade-ps8640.c
--
2.20.1
From: Jitao Shi <[email protected]>
This patch adds drm_bridge driver for parade DSI to eDP bridge chip.
Signed-off-by: Jitao Shi <[email protected]>
Reviewed-by: Daniel Kurtz <[email protected]>
[uli: followed API changes, removed FW update feature]
Signed-off-by: Ulrich Hecht <[email protected]>
Signed-off-by: Enric Balletbo i Serra <[email protected]>
Tested-by: Hsin-Yi Wang <[email protected]>
---
One of the reviews from Laurent was to use 'i2c_new_ancillary_device'. I
didn't change this for two reasons.
1) It doesn't have a devm version, so the remove path is more simple
using the devm_i2c_new_dummy_device family.
2) IIUC the ancillary function is useful when you want to retrieve the
address from the firmware or DT, that's not really the case here, as we
have a base address and fixed offset to the base address which I think
is not configurable.
Let me know if you still think that I should use the ancillary call.
Changes in v23:
- Merge mute/unmute functions into one (Nicolas Boichat)
- Use enum for ENABLE/DISABLE instead of bool (Ezequiel Garcia)
- Rename mute/unmute to vdo_control and fix error messages (Nicolas Boichat and Enric)
- Add space between address and address parameter 'address%02x' (Nicolas Boichat)
- Add Tested-by Hsin-Yi
- Added me as author after the refactor
Changes in v22:
- Remove sysfs attributes because are not really used (Enric Balletbo)
- Use enum for address page offsets (Ezequiel Garcia)
- Remove enable tracking (Enric Balletbo)
- Use panel_bridge API (Laurent Pinchart)
- Do not use kernel-doc format for non kernel-doc formatted commands (Enric Balletbo)
- Remove verbose message for PAGE1_VSTART command (Ezequiel Garcia)
- Use time_is_after_jiffies idiom (Ezequiel Garcia)
- Remove unused macros (Ezequiel Garcia)
- Fix weird alignment in dsi->mode_flags (Laurent Pinchart)
- Use drm_of_find_panel_or_bridge helper (Laurent Pinchart)
- Remove mode-sel-gpios as is not used (Laurent Pinchart)
- Remove error messages to get gpios as the core will already report it (Enric Balletbo)
- Remove redundant message getting the regulators (Laurent Pinchart)
- Rename sleep-gpios to powerdown-gpios (Laurent Pinchart)
- Use ARRAY_SIZE(ps_bridge->page) instead of MAX_DEV when possible (Laurent Pinchart)
- Fix race with userspace accessing the sysfs attributes (Laurent Pinchart)
- Remove id_table as is only used on DR platforms (Laurent Pinchart)
- Convert to new i2c device probe() (Laurent Pinchart)
- Use i2c_smbus_read/write helpers instead of open coding it (Laurent Pinchart)
- Remove unnused global variables (Laurent Pinchart)
- Remove unnused fields in ps8640 struct (Laurent Pinchart)
- Remove commented-out headers (Laurent Pinchart)
Changes in v21:
- Use devm_i2c_new_dummy_device and fix build issue using deprecated i2c_new_dummy
- Fix build issue due missing drm_bridge.h
- Do not remove in ps8640_remove device managed resources
Changes in v19:
- fixed return value of ps8640_probe() when no panel is found
Changes in v18:
- followed DRM API changes
- use DEVICE_ATTR_RO()
- remove firmware update code
- add SPDX identifier
Changes in v17:
- remove some unused head files.
- add macros for ps8640 pages.
- remove ddc_i2c client
- add mipi_dsi_device_register_full
- remove the manufacturer from the name and i2c_device_id
Changes in v16:
- Disable ps8640 DSI MCS Function.
- Rename gpios name more clearly.
- Tune the ps8640 power on sequence.
Changes in v15:
- Drop drm_connector_(un)register calls from parade ps8640.
The main DRM driver mtk_drm_drv now calls
drm_connector_register_all() after drm_dev_register() in the
mtk_drm_bind() function. That function should iterate over all
connectors and call drm_connector_register() for each of them.
So, remove drm_connector_(un)register calls from parade ps8640.
Changes in v14:
- update copyright info.
- change bridge_to_ps8640 and connector_to_ps8640 to inline function.
- fix some coding style.
- use sizeof as array counter.
- use drm_get_edid when read edid.
- add mutex when firmware updating.
Changes in v13:
- add const on data, ps8640_write_bytes(struct i2c_client *client, const u8 *data, u16 data_len)
- fix PAGE2_SW_REST tyro.
- move the buf[3] init to entrance of the function.
Changes in v12:
- fix hw_chip_id build warning
Changes in v11:
- Remove depends on I2C, add DRM depends
- Reuse ps8640_write_bytes() in ps8640_write_byte()
- Use timer check for polling like the routines in <linux/iopoll.h>
- Fix no drm_connector_unregister/drm_connector_cleanup when ps8640_bridge_attach fail
- Check the ps8640 hardware id in ps8640_validate_firmware
- Remove fw_version check
- Move ps8640_validate_firmware before ps8640_enter_bl
- Add ddc_i2c unregister when probe fail and ps8640_remove
drivers/gpu/drm/bridge/Kconfig | 11 +
drivers/gpu/drm/bridge/Makefile | 1 +
drivers/gpu/drm/bridge/parade-ps8640.c | 348 +++++++++++++++++++++++++
3 files changed, 360 insertions(+)
create mode 100644 drivers/gpu/drm/bridge/parade-ps8640.c
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 4734f6993858..3e0a63011723 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -101,6 +101,17 @@ config DRM_PARADE_PS8622
---help---
Parade eDP-LVDS bridge chip driver.
+config DRM_PARADE_PS8640
+ tristate "Parade PS8640 MIPI DSI to eDP Converter"
+ depends on OF
+ select DRM_KMS_HELPER
+ select DRM_MIPI_DSI
+ select DRM_PANEL
+ help
+ Choose this option if you have PS8640 for display
+ The PS8640 is a high-performance and low-power
+ MIPI DSI to eDP converter
+
config DRM_SIL_SII8620
tristate "Silicon Image SII8620 HDMI/MHL bridge"
depends on OF
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index 1c0c92667ac4..91490c595b38 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_DRM_LVDS_ENCODER) += lvds-encoder.o
obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
+obj-$(CONFIG_DRM_PARADE_PS8640) += parade-ps8640.o
obj-$(CONFIG_DRM_SIL_SII8620) += sil-sii8620.o
obj-$(CONFIG_DRM_SII902X) += sii902x.o
obj-$(CONFIG_DRM_SII9234) += sii9234.o
diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
new file mode 100644
index 000000000000..646ac649d175
--- /dev/null
+++ b/drivers/gpu/drm/bridge/parade-ps8640.c
@@ -0,0 +1,348 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2016 MediaTek Inc.
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_graph.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_bridge.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+
+#define PAGE2_GPIO_H 0xa7
+#define PS_GPIO9 BIT(1)
+#define PAGE2_I2C_BYPASS 0xea
+#define I2C_BYPASS_EN 0xd0
+#define PAGE2_MCS_EN 0xf3
+#define MCS_EN BIT(0)
+#define PAGE3_SET_ADD 0xfe
+#define VDO_CTL_ADD 0x13
+#define VDO_DIS 0x18
+#define VDO_EN 0x1c
+
+/*
+ * PS8640 uses multiple addresses:
+ * page[0]: for DP control
+ * page[1]: for VIDEO Bridge
+ * page[2]: for control top
+ * page[3]: for DSI Link Control1
+ * page[4]: for MIPI Phy
+ * page[5]: for VPLL
+ * page[6]: for DSI Link Control2
+ * page[7]: for SPI ROM mapping
+ */
+enum page_addr_offset {
+ PAGE0_DP_CNTL = 0,
+ PAGE1_VDO_BDG,
+ PAGE2_TOP_CNTL,
+ PAGE3_DSI_CNTL1,
+ PAGE4_MIPI_PHY,
+ PAGE5_VPLL,
+ PAGE6_DSI_CNTL2,
+ PAGE7_SPI_CNTL,
+ MAX_DEVS
+};
+
+enum ps8640_vdo_control {
+ DISABLE = VDO_DIS,
+ ENABLE = VDO_EN,
+};
+
+struct ps8640 {
+ struct drm_bridge bridge;
+ struct drm_bridge *panel_bridge;
+ struct mipi_dsi_device *dsi;
+ struct i2c_client *page[MAX_DEVS];
+ struct regulator_bulk_data supplies[2];
+ struct gpio_desc *gpio_reset;
+ struct gpio_desc *gpio_powerdown;
+};
+
+static inline struct ps8640 *bridge_to_ps8640(struct drm_bridge *e)
+{
+ return container_of(e, struct ps8640, bridge);
+}
+
+static int ps8640_bridge_vdo_control(struct ps8640 *ps_bridge,
+ const enum ps8640_vdo_control ctrl)
+{
+ struct i2c_client *client = ps_bridge->page[PAGE3_DSI_CNTL1];
+ u8 vdo_ctrl_buf[] = { VDO_CTL_ADD, ctrl };
+ int ret;
+
+ ret = i2c_smbus_write_i2c_block_data(client, PAGE3_SET_ADD,
+ sizeof(vdo_ctrl_buf),
+ vdo_ctrl_buf);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static void ps8640_pre_enable(struct drm_bridge *bridge)
+{
+ struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
+ struct i2c_client *client = ps_bridge->page[PAGE2_TOP_CNTL];
+ unsigned long timeout;
+ int ret, status;
+
+ ret = regulator_bulk_enable(ARRAY_SIZE(ps_bridge->supplies),
+ ps_bridge->supplies);
+ if (ret < 0) {
+ DRM_ERROR("cannot enable regulators %d\n", ret);
+ return;
+ }
+
+ gpiod_set_value(ps_bridge->gpio_powerdown, 1);
+ gpiod_set_value(ps_bridge->gpio_reset, 0);
+ usleep_range(2000, 2500);
+ gpiod_set_value(ps_bridge->gpio_reset, 1);
+
+ /*
+ * Wait for the ps8640 embedded MCU to be ready
+ * First wait 200ms and then check the MCU ready flag every 20ms
+ */
+ msleep(200);
+
+ timeout = jiffies + msecs_to_jiffies(200) + 1;
+
+ while (time_is_after_jiffies(timeout)) {
+ status = i2c_smbus_read_byte_data(client, PAGE2_GPIO_H);
+ if (status < 0) {
+ DRM_ERROR("failed read PAGE2_GPIO_H: %d\n", status);
+ goto err_regulators_disable;
+ }
+ if ((status & PS_GPIO9) == PS_GPIO9)
+ break;
+
+ msleep(20);
+ }
+
+ msleep(50);
+
+ /*
+ * The Manufacturer Command Set (MCS) is a device dependent interface
+ * intended for factory programming of the display module default
+ * parameters. Once the display module is configured, the MCS shall be
+ * disabled by the manufacturer. Once disabled, all MCS commands are
+ * ignored by the display interface.
+ */
+ status = i2c_smbus_read_byte_data(client, PAGE2_MCS_EN);
+ if (status < 0) {
+ DRM_ERROR("failed read PAGE2_MCS_EN: %d\n", status);
+ goto err_regulators_disable;
+ }
+
+ ret = i2c_smbus_write_byte_data(client, PAGE2_MCS_EN,
+ status & ~MCS_EN);
+ if (ret < 0) {
+ DRM_ERROR("failed write PAGE2_MCS_EN: %d\n", ret);
+ goto err_regulators_disable;
+ }
+
+ ret = ps8640_bridge_vdo_control(ps_bridge, ENABLE);
+ if (ret) {
+ DRM_ERROR("failed to enable VDO: %d\n", ret);
+ goto err_regulators_disable;
+ }
+
+ /* Switch access edp panel's edid through i2c */
+ ret = i2c_smbus_write_byte_data(client, PAGE2_I2C_BYPASS,
+ I2C_BYPASS_EN);
+ if (ret < 0) {
+ DRM_ERROR("failed write PAGE2_I2C_BYPASS: %d\n", ret);
+ goto err_regulators_disable;
+ }
+
+ return;
+
+err_regulators_disable:
+ regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
+ ps_bridge->supplies);
+}
+
+static void ps8640_post_disable(struct drm_bridge *bridge)
+{
+ struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
+ int ret;
+
+ ret = ps8640_bridge_vdo_control(ps_bridge, DISABLE);
+ if (ret < 0)
+ DRM_ERROR("failed to disable VDO: %d\n", ret);
+
+ gpiod_set_value(ps_bridge->gpio_reset, 0);
+ gpiod_set_value(ps_bridge->gpio_powerdown, 0);
+ ret = regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
+ ps_bridge->supplies);
+ if (ret < 0)
+ DRM_ERROR("cannot disable regulators %d\n", ret);
+}
+
+int ps8640_bridge_attach(struct drm_bridge *bridge)
+{
+ struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
+ struct device *dev = &ps_bridge->page[0]->dev;
+ struct device_node *in_ep, *dsi_node;
+ struct mipi_dsi_device *dsi;
+ struct mipi_dsi_host *host;
+ int ret;
+ const struct mipi_dsi_device_info info = { .type = "ps8640",
+ .channel = 0,
+ .node = NULL,
+ };
+ /* port@0 is ps8640 dsi input port */
+ in_ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
+ if (!in_ep)
+ return -ENODEV;
+
+ dsi_node = of_graph_get_remote_port_parent(in_ep);
+ of_node_put(in_ep);
+ if (!dsi_node)
+ return -ENODEV;
+
+ host = of_find_mipi_dsi_host_by_node(dsi_node);
+ of_node_put(dsi_node);
+ if (!host)
+ return -ENODEV;
+
+ dsi = mipi_dsi_device_register_full(host, &info);
+ if (IS_ERR(dsi)) {
+ dev_err(dev, "failed to create dsi device\n");
+ ret = PTR_ERR(dsi);
+ return ret;
+ }
+
+ ps_bridge->dsi = dsi;
+
+ dsi->host = host;
+ dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
+ MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
+ dsi->format = MIPI_DSI_FMT_RGB888;
+ dsi->lanes = 4;
+ ret = mipi_dsi_attach(dsi);
+ if (ret)
+ goto err_dsi_attach;
+
+ /* Attach the panel-bridge to the dsi bridge */
+ return drm_bridge_attach(bridge->encoder, ps_bridge->panel_bridge,
+ &ps_bridge->bridge);
+
+err_dsi_attach:
+ mipi_dsi_device_unregister(dsi);
+ return ret;
+}
+
+static const struct drm_bridge_funcs ps8640_bridge_funcs = {
+ .attach = ps8640_bridge_attach,
+ .post_disable = ps8640_post_disable,
+ .pre_enable = ps8640_pre_enable,
+};
+
+static int ps8640_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct device_node *np = dev->of_node;
+ struct ps8640 *ps_bridge;
+ struct drm_panel *panel;
+ int ret;
+ u32 i;
+
+ ps_bridge = devm_kzalloc(dev, sizeof(*ps_bridge), GFP_KERNEL);
+ if (!ps_bridge)
+ return -ENOMEM;
+
+ /* port@1 is ps8640 output port */
+ ret = drm_of_find_panel_or_bridge(np, 1, 0, &panel, NULL);
+ if (ret < 0)
+ return ret;
+ if (!panel)
+ return -ENODEV;
+
+ panel->connector_type = DRM_MODE_CONNECTOR_eDP;
+
+ ps_bridge->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
+ if (IS_ERR(ps_bridge->panel_bridge))
+ return PTR_ERR(ps_bridge->panel_bridge);
+
+ ps_bridge->supplies[0].supply = "vdd33";
+ ps_bridge->supplies[1].supply = "vdd12";
+ ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ps_bridge->supplies),
+ ps_bridge->supplies);
+ if (ret)
+ return ret;
+
+ ps_bridge->gpio_powerdown = devm_gpiod_get(&client->dev, "powerdown",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(ps_bridge->gpio_powerdown))
+ return PTR_ERR(ps_bridge->gpio_powerdown);
+
+ /*
+ * Request the reset pin low to avoid the bridge being
+ * initialized prematurely
+ */
+ ps_bridge->gpio_reset = devm_gpiod_get(&client->dev, "reset",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(ps_bridge->gpio_reset))
+ return PTR_ERR(ps_bridge->gpio_reset);
+
+ ps_bridge->bridge.funcs = &ps8640_bridge_funcs;
+ ps_bridge->bridge.of_node = dev->of_node;
+
+ ps_bridge->page[PAGE0_DP_CNTL] = client;
+
+ for (i = 1; i < ARRAY_SIZE(ps_bridge->page); i++) {
+ ps_bridge->page[i] = devm_i2c_new_dummy_device(&client->dev,
+ client->adapter,
+ client->addr + i);
+ if (IS_ERR(ps_bridge->page[i])) {
+ dev_err(dev, "failed i2c dummy device, address %02x\n",
+ client->addr + i);
+ return PTR_ERR(ps_bridge->page[i]);
+ }
+ }
+
+ i2c_set_clientdata(client, ps_bridge);
+
+ drm_bridge_add(&ps_bridge->bridge);
+
+ return 0;
+}
+
+static int ps8640_remove(struct i2c_client *client)
+{
+ struct ps8640 *ps_bridge = i2c_get_clientdata(client);
+
+ drm_bridge_remove(&ps_bridge->bridge);
+
+ return 0;
+}
+
+static const struct of_device_id ps8640_match[] = {
+ { .compatible = "parade,ps8640" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ps8640_match);
+
+static struct i2c_driver ps8640_driver = {
+ .probe_new = ps8640_probe,
+ .remove = ps8640_remove,
+ .driver = {
+ .name = "ps8640",
+ .of_match_table = ps8640_match,
+ },
+};
+module_i2c_driver(ps8640_driver);
+
+MODULE_AUTHOR("Jitao Shi <[email protected]>");
+MODULE_AUTHOR("CK Hu <[email protected]>");
+MODULE_AUTHOR("Enric Balletbo i Serra <[email protected]>");
+MODULE_DESCRIPTION("PARADE ps8640 DSI-eDP converter driver");
+MODULE_LICENSE("GPL v2");
--
2.20.1
From: Jitao Shi <[email protected]>
Add documentation for DT properties supported by
ps8640 DSI-eDP converter.
Signed-off-by: Jitao Shi <[email protected]>
Acked-by: Rob Herring <[email protected]>
Reviewed-by: Philipp Zabel <[email protected]>
Signed-off-by: Ulrich Hecht <[email protected]>
Signed-off-by: Enric Balletbo i Serra <[email protected]>
---
I maintained the ack from Rob Herring and the review from Philipp
because in essence the only thing I did is migrate to YAML format and
check that no errors are reported via dtbs_check. Just let me know if
you're not agree.
Apart from this note that I removed the mode-sel property because is not
used and I renamed sleep-gpios to powerdown-gpios.
Changes in v23: None
Changes in v22:
- Migrate to YAML format (Maxime Ripart)
- Remove mode-sel property.
- Rename sleep-gpios to powerdown-gpios.
Changes in v21: None
Changes in v19: None
Changes in v18: None
Changes in v17: None
Changes in v16: None
Changes in v15: None
Changes in v14: None
Changes in v13: None
Changes in v12: None
Changes in v11: None
.../bindings/display/bridge/ps8640.yaml | 112 ++++++++++++++++++
1 file changed, 112 insertions(+)
create mode 100644 Documentation/devicetree/bindings/display/bridge/ps8640.yaml
diff --git a/Documentation/devicetree/bindings/display/bridge/ps8640.yaml b/Documentation/devicetree/bindings/display/bridge/ps8640.yaml
new file mode 100644
index 000000000000..5dff93641bea
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/ps8640.yaml
@@ -0,0 +1,112 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/bridge/ps8640.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MIPI DSI to eDP Video Format Converter Device Tree Bindings
+
+maintainers:
+ - Nicolas Boichat <[email protected]>
+ - Enric Balletbo i Serra <[email protected]>
+
+description: |
+ The PS8640 is a low power MIPI-to-eDP video format converter supporting
+ mobile devices with embedded panel resolutions up to 2048 x 1536. The
+ device accepts a single channel of MIPI DSI v1.1, with up to four lanes
+ plus clock, at a transmission rate up to 1.5Gbit/sec per lane. The
+ device outputs eDP v1.4, one or two lanes, at a link rate of up to
+ 3.24Gbit/sec per lane.
+
+properties:
+ compatible:
+ const: parade,ps8640
+
+ reg:
+ maxItems: 1
+ description: Base I2C address of the device.
+
+ powerdown-gpios:
+ maxItems: 1
+ description: GPIO connected to active low powerdown.
+
+ reset-gpios:
+ maxItems: 1
+ description: GPIO connected to active low reset.
+
+ vdd12-supply:
+ maxItems: 1
+ description: Regulator for 1.2V digital core power.
+
+ vdd33-supply:
+ maxItems: 1
+ description: Regulator for 3.3V digital core power.
+
+ ports:
+ type: object
+ description:
+ A node containing DSI input & output port nodes with endpoint
+ definitions as documented in
+ Documentation/devicetree/bindings/media/video-interfaces.txt
+ Documentation/devicetree/bindings/graph.txt
+ properties:
+ port@0:
+ type: object
+ description: |
+ Video port for DSI input
+
+ port@1:
+ type: object
+ description: |
+ Video port for eDP output (panel or connector).
+
+ required:
+ - port@0
+
+required:
+ - compatible
+ - reg
+ - powerdown-gpios
+ - reset-gpios
+ - vdd12-supply
+ - vdd33-supply
+ - ports
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+ i2c0 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ ps8640: edp-bridge@18 {
+ compatible = "parade,ps8640";
+ reg = <0x18>;
+ powerdown-gpios = <&pio 116 GPIO_ACTIVE_LOW>;
+ reset-gpios = <&pio 115 GPIO_ACTIVE_LOW>;
+ vdd12-supply = <&ps8640_fixed_1v2>;
+ vdd33-supply = <&mt6397_vgp2_reg>;
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port@0 {
+ reg = <0>;
+ ps8640_in: endpoint {
+ remote-endpoint = <&dsi0_out>;
+ };
+ };
+
+ port@1 {
+ reg = <1>;
+ ps8640_out: endpoint {
+ remote-endpoint = <&panel_in>;
+ };
+ };
+ };
+ };
+ };
+
--
2.20.1
Hi Laurent,
On 23/12/19 15:35, Enric Balletbo i Serra wrote:
> From: Jitao Shi <[email protected]>
>
> This patch adds drm_bridge driver for parade DSI to eDP bridge chip.
>
> Signed-off-by: Jitao Shi <[email protected]>
> Reviewed-by: Daniel Kurtz <[email protected]>
> [uli: followed API changes, removed FW update feature]
> Signed-off-by: Ulrich Hecht <[email protected]>
> Signed-off-by: Enric Balletbo i Serra <[email protected]>
> Tested-by: Hsin-Yi Wang <[email protected]>
> ---
> One of the reviews from Laurent was to use 'i2c_new_ancillary_device'. I
> didn't change this for two reasons.
> 1) It doesn't have a devm version, so the remove path is more simple
> using the devm_i2c_new_dummy_device family.
> 2) IIUC the ancillary function is useful when you want to retrieve the
> address from the firmware or DT, that's not really the case here, as we
> have a base address and fixed offset to the base address which I think
> is not configurable.
>
> Let me know if you still think that I should use the ancillary call.
>
> Changes in v23:
> - Merge mute/unmute functions into one (Nicolas Boichat)
> - Use enum for ENABLE/DISABLE instead of bool (Ezequiel Garcia)
> - Rename mute/unmute to vdo_control and fix error messages (Nicolas Boichat and Enric)
> - Add space between address and address parameter 'address%02x' (Nicolas Boichat)
> - Add Tested-by Hsin-Yi
> - Added me as author after the refactor
>
> Changes in v22:
> - Remove sysfs attributes because are not really used (Enric Balletbo)
> - Use enum for address page offsets (Ezequiel Garcia)
> - Remove enable tracking (Enric Balletbo)
> - Use panel_bridge API (Laurent Pinchart)
> - Do not use kernel-doc format for non kernel-doc formatted commands (Enric Balletbo)
> - Remove verbose message for PAGE1_VSTART command (Ezequiel Garcia)
> - Use time_is_after_jiffies idiom (Ezequiel Garcia)
> - Remove unused macros (Ezequiel Garcia)
> - Fix weird alignment in dsi->mode_flags (Laurent Pinchart)
> - Use drm_of_find_panel_or_bridge helper (Laurent Pinchart)
> - Remove mode-sel-gpios as is not used (Laurent Pinchart)
> - Remove error messages to get gpios as the core will already report it (Enric Balletbo)
> - Remove redundant message getting the regulators (Laurent Pinchart)
> - Rename sleep-gpios to powerdown-gpios (Laurent Pinchart)
> - Use ARRAY_SIZE(ps_bridge->page) instead of MAX_DEV when possible (Laurent Pinchart)
> - Fix race with userspace accessing the sysfs attributes (Laurent Pinchart)
> - Remove id_table as is only used on DR platforms (Laurent Pinchart)
> - Convert to new i2c device probe() (Laurent Pinchart)
> - Use i2c_smbus_read/write helpers instead of open coding it (Laurent Pinchart)
> - Remove unnused global variables (Laurent Pinchart)
> - Remove unnused fields in ps8640 struct (Laurent Pinchart)
> - Remove commented-out headers (Laurent Pinchart)
>
> Changes in v21:
> - Use devm_i2c_new_dummy_device and fix build issue using deprecated i2c_new_dummy
> - Fix build issue due missing drm_bridge.h
> - Do not remove in ps8640_remove device managed resources
>
> Changes in v19:
> - fixed return value of ps8640_probe() when no panel is found
>
> Changes in v18:
> - followed DRM API changes
> - use DEVICE_ATTR_RO()
> - remove firmware update code
> - add SPDX identifier
>
> Changes in v17:
> - remove some unused head files.
> - add macros for ps8640 pages.
> - remove ddc_i2c client
> - add mipi_dsi_device_register_full
> - remove the manufacturer from the name and i2c_device_id
>
> Changes in v16:
> - Disable ps8640 DSI MCS Function.
> - Rename gpios name more clearly.
> - Tune the ps8640 power on sequence.
>
> Changes in v15:
> - Drop drm_connector_(un)register calls from parade ps8640.
> The main DRM driver mtk_drm_drv now calls
> drm_connector_register_all() after drm_dev_register() in the
> mtk_drm_bind() function. That function should iterate over all
> connectors and call drm_connector_register() for each of them.
> So, remove drm_connector_(un)register calls from parade ps8640.
>
> Changes in v14:
> - update copyright info.
> - change bridge_to_ps8640 and connector_to_ps8640 to inline function.
> - fix some coding style.
> - use sizeof as array counter.
> - use drm_get_edid when read edid.
> - add mutex when firmware updating.
>
> Changes in v13:
> - add const on data, ps8640_write_bytes(struct i2c_client *client, const u8 *data, u16 data_len)
> - fix PAGE2_SW_REST tyro.
> - move the buf[3] init to entrance of the function.
>
> Changes in v12:
> - fix hw_chip_id build warning
>
> Changes in v11:
> - Remove depends on I2C, add DRM depends
> - Reuse ps8640_write_bytes() in ps8640_write_byte()
> - Use timer check for polling like the routines in <linux/iopoll.h>
> - Fix no drm_connector_unregister/drm_connector_cleanup when ps8640_bridge_attach fail
> - Check the ps8640 hardware id in ps8640_validate_firmware
> - Remove fw_version check
> - Move ps8640_validate_firmware before ps8640_enter_bl
> - Add ddc_i2c unregister when probe fail and ps8640_remove
>
> drivers/gpu/drm/bridge/Kconfig | 11 +
> drivers/gpu/drm/bridge/Makefile | 1 +
> drivers/gpu/drm/bridge/parade-ps8640.c | 348 +++++++++++++++++++++++++
> 3 files changed, 360 insertions(+)
> create mode 100644 drivers/gpu/drm/bridge/parade-ps8640.c
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 4734f6993858..3e0a63011723 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -101,6 +101,17 @@ config DRM_PARADE_PS8622
> ---help---
> Parade eDP-LVDS bridge chip driver.
>
> +config DRM_PARADE_PS8640
> + tristate "Parade PS8640 MIPI DSI to eDP Converter"
> + depends on OF
> + select DRM_KMS_HELPER
> + select DRM_MIPI_DSI
> + select DRM_PANEL
> + help
> + Choose this option if you have PS8640 for display
> + The PS8640 is a high-performance and low-power
> + MIPI DSI to eDP converter
> +
> config DRM_SIL_SII8620
> tristate "Silicon Image SII8620 HDMI/MHL bridge"
> depends on OF
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index 1c0c92667ac4..91490c595b38 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -8,6 +8,7 @@ obj-$(CONFIG_DRM_LVDS_ENCODER) += lvds-encoder.o
> obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
> obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
> obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
> +obj-$(CONFIG_DRM_PARADE_PS8640) += parade-ps8640.o
> obj-$(CONFIG_DRM_SIL_SII8620) += sil-sii8620.o
> obj-$(CONFIG_DRM_SII902X) += sii902x.o
> obj-$(CONFIG_DRM_SII9234) += sii9234.o
> diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
> new file mode 100644
> index 000000000000..646ac649d175
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/parade-ps8640.c
> @@ -0,0 +1,348 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2016 MediaTek Inc.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/of_graph.h>
> +#include <linux/regulator/consumer.h>
> +
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_of.h>
> +#include <drm/drm_panel.h>
> +#include <drm/drm_print.h>
> +
> +#define PAGE2_GPIO_H 0xa7
> +#define PS_GPIO9 BIT(1)
> +#define PAGE2_I2C_BYPASS 0xea
> +#define I2C_BYPASS_EN 0xd0
> +#define PAGE2_MCS_EN 0xf3
> +#define MCS_EN BIT(0)
> +#define PAGE3_SET_ADD 0xfe
> +#define VDO_CTL_ADD 0x13
> +#define VDO_DIS 0x18
> +#define VDO_EN 0x1c
> +
> +/*
> + * PS8640 uses multiple addresses:
> + * page[0]: for DP control
> + * page[1]: for VIDEO Bridge
> + * page[2]: for control top
> + * page[3]: for DSI Link Control1
> + * page[4]: for MIPI Phy
> + * page[5]: for VPLL
> + * page[6]: for DSI Link Control2
> + * page[7]: for SPI ROM mapping
> + */
> +enum page_addr_offset {
> + PAGE0_DP_CNTL = 0,
> + PAGE1_VDO_BDG,
> + PAGE2_TOP_CNTL,
> + PAGE3_DSI_CNTL1,
> + PAGE4_MIPI_PHY,
> + PAGE5_VPLL,
> + PAGE6_DSI_CNTL2,
> + PAGE7_SPI_CNTL,
> + MAX_DEVS
> +};
> +
> +enum ps8640_vdo_control {
> + DISABLE = VDO_DIS,
> + ENABLE = VDO_EN,
> +};
> +
> +struct ps8640 {
> + struct drm_bridge bridge;
> + struct drm_bridge *panel_bridge;
> + struct mipi_dsi_device *dsi;
> + struct i2c_client *page[MAX_DEVS];
> + struct regulator_bulk_data supplies[2];
> + struct gpio_desc *gpio_reset;
> + struct gpio_desc *gpio_powerdown;
> +};
> +
> +static inline struct ps8640 *bridge_to_ps8640(struct drm_bridge *e)
> +{
> + return container_of(e, struct ps8640, bridge);
> +}
> +
> +static int ps8640_bridge_vdo_control(struct ps8640 *ps_bridge,
> + const enum ps8640_vdo_control ctrl)
> +{
> + struct i2c_client *client = ps_bridge->page[PAGE3_DSI_CNTL1];
> + u8 vdo_ctrl_buf[] = { VDO_CTL_ADD, ctrl };
> + int ret;
> +
> + ret = i2c_smbus_write_i2c_block_data(client, PAGE3_SET_ADD,
> + sizeof(vdo_ctrl_buf),
> + vdo_ctrl_buf);
> + if (ret < 0)
> + return ret;
> +
> + return 0;
> +}
> +
> +static void ps8640_pre_enable(struct drm_bridge *bridge)
> +{
> + struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
> + struct i2c_client *client = ps_bridge->page[PAGE2_TOP_CNTL];
> + unsigned long timeout;
> + int ret, status;
> +
> + ret = regulator_bulk_enable(ARRAY_SIZE(ps_bridge->supplies),
> + ps_bridge->supplies);
> + if (ret < 0) {
> + DRM_ERROR("cannot enable regulators %d\n", ret);
> + return;
> + }
> +
> + gpiod_set_value(ps_bridge->gpio_powerdown, 1);
> + gpiod_set_value(ps_bridge->gpio_reset, 0);
> + usleep_range(2000, 2500);
> + gpiod_set_value(ps_bridge->gpio_reset, 1);
> +
> + /*
> + * Wait for the ps8640 embedded MCU to be ready
> + * First wait 200ms and then check the MCU ready flag every 20ms
> + */
> + msleep(200);
> +
> + timeout = jiffies + msecs_to_jiffies(200) + 1;
> +
> + while (time_is_after_jiffies(timeout)) {
> + status = i2c_smbus_read_byte_data(client, PAGE2_GPIO_H);
> + if (status < 0) {
> + DRM_ERROR("failed read PAGE2_GPIO_H: %d\n", status);
> + goto err_regulators_disable;
> + }
> + if ((status & PS_GPIO9) == PS_GPIO9)
> + break;
> +
> + msleep(20);
> + }
> +
> + msleep(50);
> +
> + /*
> + * The Manufacturer Command Set (MCS) is a device dependent interface
> + * intended for factory programming of the display module default
> + * parameters. Once the display module is configured, the MCS shall be
> + * disabled by the manufacturer. Once disabled, all MCS commands are
> + * ignored by the display interface.
> + */
> + status = i2c_smbus_read_byte_data(client, PAGE2_MCS_EN);
> + if (status < 0) {
> + DRM_ERROR("failed read PAGE2_MCS_EN: %d\n", status);
> + goto err_regulators_disable;
> + }
> +
> + ret = i2c_smbus_write_byte_data(client, PAGE2_MCS_EN,
> + status & ~MCS_EN);
> + if (ret < 0) {
> + DRM_ERROR("failed write PAGE2_MCS_EN: %d\n", ret);
> + goto err_regulators_disable;
> + }
> +
> + ret = ps8640_bridge_vdo_control(ps_bridge, ENABLE);
> + if (ret) {
> + DRM_ERROR("failed to enable VDO: %d\n", ret);
> + goto err_regulators_disable;
> + }
> +
> + /* Switch access edp panel's edid through i2c */
> + ret = i2c_smbus_write_byte_data(client, PAGE2_I2C_BYPASS,
> + I2C_BYPASS_EN);
> + if (ret < 0) {
> + DRM_ERROR("failed write PAGE2_I2C_BYPASS: %d\n", ret);
> + goto err_regulators_disable;
> + }
> +
> + return;
> +
> +err_regulators_disable:
> + regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
> + ps_bridge->supplies);
> +}
> +
> +static void ps8640_post_disable(struct drm_bridge *bridge)
> +{
> + struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
> + int ret;
> +
> + ret = ps8640_bridge_vdo_control(ps_bridge, DISABLE);
> + if (ret < 0)
> + DRM_ERROR("failed to disable VDO: %d\n", ret);
> +
> + gpiod_set_value(ps_bridge->gpio_reset, 0);
> + gpiod_set_value(ps_bridge->gpio_powerdown, 0);
> + ret = regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
> + ps_bridge->supplies);
> + if (ret < 0)
> + DRM_ERROR("cannot disable regulators %d\n", ret);
> +}
> +
> +int ps8640_bridge_attach(struct drm_bridge *bridge)
> +{
> + struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
> + struct device *dev = &ps_bridge->page[0]->dev;
> + struct device_node *in_ep, *dsi_node;
> + struct mipi_dsi_device *dsi;
> + struct mipi_dsi_host *host;
> + int ret;
> + const struct mipi_dsi_device_info info = { .type = "ps8640",
> + .channel = 0,
> + .node = NULL,
> + };
> + /* port@0 is ps8640 dsi input port */
> + in_ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
> + if (!in_ep)
> + return -ENODEV;
> +
> + dsi_node = of_graph_get_remote_port_parent(in_ep);
> + of_node_put(in_ep);
> + if (!dsi_node)
> + return -ENODEV;
> +
> + host = of_find_mipi_dsi_host_by_node(dsi_node);
> + of_node_put(dsi_node);
> + if (!host)
> + return -ENODEV;
> +
> + dsi = mipi_dsi_device_register_full(host, &info);
> + if (IS_ERR(dsi)) {
> + dev_err(dev, "failed to create dsi device\n");
> + ret = PTR_ERR(dsi);
> + return ret;
> + }
> +
> + ps_bridge->dsi = dsi;
> +
> + dsi->host = host;
> + dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
> + MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
> + dsi->format = MIPI_DSI_FMT_RGB888;
> + dsi->lanes = 4;
> + ret = mipi_dsi_attach(dsi);
> + if (ret)
> + goto err_dsi_attach;
> +
> + /* Attach the panel-bridge to the dsi bridge */
> + return drm_bridge_attach(bridge->encoder, ps_bridge->panel_bridge,
> + &ps_bridge->bridge);
> +
> +err_dsi_attach:
> + mipi_dsi_device_unregister(dsi);
> + return ret;
> +}
> +
> +static const struct drm_bridge_funcs ps8640_bridge_funcs = {
> + .attach = ps8640_bridge_attach,
> + .post_disable = ps8640_post_disable,
> + .pre_enable = ps8640_pre_enable,
> +};
> +
> +static int ps8640_probe(struct i2c_client *client)
> +{
> + struct device *dev = &client->dev;
> + struct device_node *np = dev->of_node;
> + struct ps8640 *ps_bridge;
> + struct drm_panel *panel;
> + int ret;
> + u32 i;
> +
> + ps_bridge = devm_kzalloc(dev, sizeof(*ps_bridge), GFP_KERNEL);
> + if (!ps_bridge)
> + return -ENOMEM;
> +
> + /* port@1 is ps8640 output port */
> + ret = drm_of_find_panel_or_bridge(np, 1, 0, &panel, NULL);
> + if (ret < 0)
> + return ret;
> + if (!panel)
> + return -ENODEV;
> +
> + panel->connector_type = DRM_MODE_CONNECTOR_eDP;
> +
> + ps_bridge->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
> + if (IS_ERR(ps_bridge->panel_bridge))
> + return PTR_ERR(ps_bridge->panel_bridge);
> +
> + ps_bridge->supplies[0].supply = "vdd33";
> + ps_bridge->supplies[1].supply = "vdd12";
> + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ps_bridge->supplies),
> + ps_bridge->supplies);
> + if (ret)
> + return ret;
> +
> + ps_bridge->gpio_powerdown = devm_gpiod_get(&client->dev, "powerdown",
> + GPIOD_OUT_LOW);
> + if (IS_ERR(ps_bridge->gpio_powerdown))
> + return PTR_ERR(ps_bridge->gpio_powerdown);
> +
> + /*
> + * Request the reset pin low to avoid the bridge being
> + * initialized prematurely
Ezequiel made me realise that I didn't address one of your comments from the
beginning.
"The polarity is wrong in DT then. Requesting the GPIO low should
deassert reset, in drivers all GPIO descriptors should be handled as
active high. Same for the sleep GPIO."
I fixed my DT and I'll fix this in next version I send. I'll just wait a bit for
if I receive more feedback to no flood more the ML with these patches. Let me
know if you have more comments.
Thanks,
Enric
> + */
> + ps_bridge->gpio_reset = devm_gpiod_get(&client->dev, "reset",
> + GPIOD_OUT_LOW);
> + if (IS_ERR(ps_bridge->gpio_reset))
> + return PTR_ERR(ps_bridge->gpio_reset);
> +
> + ps_bridge->bridge.funcs = &ps8640_bridge_funcs;
> + ps_bridge->bridge.of_node = dev->of_node;
> +
> + ps_bridge->page[PAGE0_DP_CNTL] = client;
> +
> + for (i = 1; i < ARRAY_SIZE(ps_bridge->page); i++) {
> + ps_bridge->page[i] = devm_i2c_new_dummy_device(&client->dev,
> + client->adapter,
> + client->addr + i);
> + if (IS_ERR(ps_bridge->page[i])) {
> + dev_err(dev, "failed i2c dummy device, address %02x\n",
> + client->addr + i);
> + return PTR_ERR(ps_bridge->page[i]);
> + }
> + }
> +
> + i2c_set_clientdata(client, ps_bridge);
> +
> + drm_bridge_add(&ps_bridge->bridge);
> +
> + return 0;
> +}
> +
> +static int ps8640_remove(struct i2c_client *client)
> +{
> + struct ps8640 *ps_bridge = i2c_get_clientdata(client);
> +
> + drm_bridge_remove(&ps_bridge->bridge);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id ps8640_match[] = {
> + { .compatible = "parade,ps8640" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, ps8640_match);
> +
> +static struct i2c_driver ps8640_driver = {
> + .probe_new = ps8640_probe,
> + .remove = ps8640_remove,
> + .driver = {
> + .name = "ps8640",
> + .of_match_table = ps8640_match,
> + },
> +};
> +module_i2c_driver(ps8640_driver);
> +
> +MODULE_AUTHOR("Jitao Shi <[email protected]>");
> +MODULE_AUTHOR("CK Hu <[email protected]>");
> +MODULE_AUTHOR("Enric Balletbo i Serra <[email protected]>");
> +MODULE_DESCRIPTION("PARADE ps8640 DSI-eDP converter driver");
> +MODULE_LICENSE("GPL v2");
>
Hi Enric, Rob,
On Mon, 2019-12-23 at 15:35 +0100, Enric Balletbo i Serra wrote:
> From: Jitao Shi <[email protected]>
>
> Add documentation for DT properties supported by
> ps8640 DSI-eDP converter.
>
> Signed-off-by: Jitao Shi <[email protected]>
> Acked-by: Rob Herring <[email protected]>
> Reviewed-by: Philipp Zabel <[email protected]>
> Signed-off-by: Ulrich Hecht <[email protected]>
> Signed-off-by: Enric Balletbo i Serra <[email protected]>
[..]
> +
> + ports:
> + type: object
> + description:
> + A node containing DSI input & output port nodes with endpoint
> + definitions as documented in
> + Documentation/devicetree/bindings/media/video-interfaces.txt
> + Documentation/devicetree/bindings/graph.txt
> + properties:
> + port@0:
> + type: object
> + description: |
> + Video port for DSI input
> +
> + port@1:
> + type: object
> + description: |
> + Video port for eDP output (panel or connector).
> +
> + required:
> + - port@0
> +
Is it correct to require port@0 ? This could be called port@1
or port@2, and IIUC it should bind the same.
Thanks,
Ezequiel
> +required:
> + - compatible
> + - reg
> + - powerdown-gpios
> + - reset-gpios
> + - vdd12-supply
> + - vdd33-supply
> + - ports
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/gpio/gpio.h>
> + i2c0 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + ps8640: edp-bridge@18 {
> + compatible = "parade,ps8640";
> + reg = <0x18>;
> + powerdown-gpios = <&pio 116 GPIO_ACTIVE_LOW>;
> + reset-gpios = <&pio 115 GPIO_ACTIVE_LOW>;
> + vdd12-supply = <&ps8640_fixed_1v2>;
> + vdd33-supply = <&mt6397_vgp2_reg>;
> +
> + ports {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + port@0 {
> + reg = <0>;
> + ps8640_in: endpoint {
> + remote-endpoint = <&dsi0_out>;
> + };
> + };
> +
> + port@1 {
> + reg = <1>;
> + ps8640_out: endpoint {
> + remote-endpoint = <&panel_in>;
> + };
> + };
> + };
> + };
> + };
> +
> --
> 2.20.1
>
>
Hi Enric,
Note that this series is marked as v22, but it's really the 23th.
Some minor comments below, it's looking really now.
Reviewed-by: Ezequiel Garcia <[email protected]>
On Mon, 2019-12-23 at 15:35 +0100, Enric Balletbo i Serra wrote:
> From: Jitao Shi <[email protected]>
>
> This patch adds drm_bridge driver for parade DSI to eDP bridge chip.
>
> Signed-off-by: Jitao Shi <[email protected]>
> Reviewed-by: Daniel Kurtz <[email protected]>
> [uli: followed API changes, removed FW update feature]
> Signed-off-by: Ulrich Hecht <[email protected]>
> Signed-off-by: Enric Balletbo i Serra <[email protected]>
> Tested-by: Hsin-Yi Wang <[email protected]>
> ---
> One of the reviews from Laurent was to use 'i2c_new_ancillary_device'. I
> didn't change this for two reasons.
> 1) It doesn't have a devm version, so the remove path is more simple
> using the devm_i2c_new_dummy_device family.
> 2) IIUC the ancillary function is useful when you want to retrieve the
> address from the firmware or DT, that's not really the case here, as we
> have a base address and fixed offset to the base address which I think
> is not configurable.
>
> Let me know if you still think that I should use the ancillary call.
>
> Changes in v23:
> - Merge mute/unmute functions into one (Nicolas Boichat)
> - Use enum for ENABLE/DISABLE instead of bool (Ezequiel Garcia)
> - Rename mute/unmute to vdo_control and fix error messages (Nicolas Boichat and Enric)
> - Add space between address and address parameter 'address%02x' (Nicolas Boichat)
> - Add Tested-by Hsin-Yi
> - Added me as author after the refactor
>
> Changes in v22:
> - Remove sysfs attributes because are not really used (Enric Balletbo)
> - Use enum for address page offsets (Ezequiel Garcia)
> - Remove enable tracking (Enric Balletbo)
> - Use panel_bridge API (Laurent Pinchart)
> - Do not use kernel-doc format for non kernel-doc formatted commands (Enric Balletbo)
> - Remove verbose message for PAGE1_VSTART command (Ezequiel Garcia)
> - Use time_is_after_jiffies idiom (Ezequiel Garcia)
> - Remove unused macros (Ezequiel Garcia)
> - Fix weird alignment in dsi->mode_flags (Laurent Pinchart)
> - Use drm_of_find_panel_or_bridge helper (Laurent Pinchart)
> - Remove mode-sel-gpios as is not used (Laurent Pinchart)
> - Remove error messages to get gpios as the core will already report it (Enric Balletbo)
> - Remove redundant message getting the regulators (Laurent Pinchart)
> - Rename sleep-gpios to powerdown-gpios (Laurent Pinchart)
> - Use ARRAY_SIZE(ps_bridge->page) instead of MAX_DEV when possible (Laurent Pinchart)
> - Fix race with userspace accessing the sysfs attributes (Laurent Pinchart)
> - Remove id_table as is only used on DR platforms (Laurent Pinchart)
> - Convert to new i2c device probe() (Laurent Pinchart)
> - Use i2c_smbus_read/write helpers instead of open coding it (Laurent Pinchart)
> - Remove unnused global variables (Laurent Pinchart)
> - Remove unnused fields in ps8640 struct (Laurent Pinchart)
> - Remove commented-out headers (Laurent Pinchart)
>
> Changes in v21:
> - Use devm_i2c_new_dummy_device and fix build issue using deprecated i2c_new_dummy
> - Fix build issue due missing drm_bridge.h
> - Do not remove in ps8640_remove device managed resources
>
> Changes in v19:
> - fixed return value of ps8640_probe() when no panel is found
>
> Changes in v18:
> - followed DRM API changes
> - use DEVICE_ATTR_RO()
> - remove firmware update code
> - add SPDX identifier
>
> Changes in v17:
> - remove some unused head files.
> - add macros for ps8640 pages.
> - remove ddc_i2c client
> - add mipi_dsi_device_register_full
> - remove the manufacturer from the name and i2c_device_id
>
> Changes in v16:
> - Disable ps8640 DSI MCS Function.
> - Rename gpios name more clearly.
> - Tune the ps8640 power on sequence.
>
> Changes in v15:
> - Drop drm_connector_(un)register calls from parade ps8640.
> The main DRM driver mtk_drm_drv now calls
> drm_connector_register_all() after drm_dev_register() in the
> mtk_drm_bind() function. That function should iterate over all
> connectors and call drm_connector_register() for each of them.
> So, remove drm_connector_(un)register calls from parade ps8640.
>
> Changes in v14:
> - update copyright info.
> - change bridge_to_ps8640 and connector_to_ps8640 to inline function.
> - fix some coding style.
> - use sizeof as array counter.
> - use drm_get_edid when read edid.
> - add mutex when firmware updating.
>
> Changes in v13:
> - add const on data, ps8640_write_bytes(struct i2c_client *client, const u8 *data, u16 data_len)
> - fix PAGE2_SW_REST tyro.
> - move the buf[3] init to entrance of the function.
>
> Changes in v12:
> - fix hw_chip_id build warning
>
> Changes in v11:
> - Remove depends on I2C, add DRM depends
> - Reuse ps8640_write_bytes() in ps8640_write_byte()
> - Use timer check for polling like the routines in <linux/iopoll.h>
> - Fix no drm_connector_unregister/drm_connector_cleanup when ps8640_bridge_attach fail
> - Check the ps8640 hardware id in ps8640_validate_firmware
> - Remove fw_version check
> - Move ps8640_validate_firmware before ps8640_enter_bl
> - Add ddc_i2c unregister when probe fail and ps8640_remove
>
> drivers/gpu/drm/bridge/Kconfig | 11 +
> drivers/gpu/drm/bridge/Makefile | 1 +
> drivers/gpu/drm/bridge/parade-ps8640.c | 348 +++++++++++++++++++++++++
> 3 files changed, 360 insertions(+)
> create mode 100644 drivers/gpu/drm/bridge/parade-ps8640.c
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 4734f6993858..3e0a63011723 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -101,6 +101,17 @@ config DRM_PARADE_PS8622
> ---help---
> Parade eDP-LVDS bridge chip driver.
>
> +config DRM_PARADE_PS8640
> + tristate "Parade PS8640 MIPI DSI to eDP Converter"
Not a showstopper, but perhaps later you can amend the other
Parade bridge menuconfig entry. Right now it's
"Parade eDP/LVDS bridge". It would be nice to have
consistency between Parade bridges.
> + depends on OF
> + select DRM_KMS_HELPER
> + select DRM_MIPI_DSI
> + select DRM_PANEL
> + help
> + Choose this option if you have PS8640 for display
> + The PS8640 is a high-performance and low-power
> + MIPI DSI to eDP converter
> +
> config DRM_SIL_SII8620
> tristate "Silicon Image SII8620 HDMI/MHL bridge"
> depends on OF
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index 1c0c92667ac4..91490c595b38 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -8,6 +8,7 @@ obj-$(CONFIG_DRM_LVDS_ENCODER) += lvds-encoder.o
> obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
> obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
> obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
> +obj-$(CONFIG_DRM_PARADE_PS8640) += parade-ps8640.o
> obj-$(CONFIG_DRM_SIL_SII8620) += sil-sii8620.o
> obj-$(CONFIG_DRM_SII902X) += sii902x.o
> obj-$(CONFIG_DRM_SII9234) += sii9234.o
> diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
> new file mode 100644
> index 000000000000..646ac649d175
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/parade-ps8640.c
> @@ -0,0 +1,348 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2016 MediaTek Inc.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/of_graph.h>
> +#include <linux/regulator/consumer.h>
> +
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_of.h>
> +#include <drm/drm_panel.h>
> +#include <drm/drm_print.h>
> +
> +#define PAGE2_GPIO_H 0xa7
> +#define PS_GPIO9 BIT(1)
> +#define PAGE2_I2C_BYPASS 0xea
> +#define I2C_BYPASS_EN 0xd0
> +#define PAGE2_MCS_EN 0xf3
> +#define MCS_EN BIT(0)
> +#define PAGE3_SET_ADD 0xfe
> +#define VDO_CTL_ADD 0x13
> +#define VDO_DIS 0x18
> +#define VDO_EN 0x1c
> +
> +/*
> + * PS8640 uses multiple addresses:
> + * page[0]: for DP control
> + * page[1]: for VIDEO Bridge
> + * page[2]: for control top
> + * page[3]: for DSI Link Control1
> + * page[4]: for MIPI Phy
> + * page[5]: for VPLL
> + * page[6]: for DSI Link Control2
> + * page[7]: for SPI ROM mapping
> + */
> +enum page_addr_offset {
> + PAGE0_DP_CNTL = 0,
> + PAGE1_VDO_BDG,
> + PAGE2_TOP_CNTL,
> + PAGE3_DSI_CNTL1,
> + PAGE4_MIPI_PHY,
> + PAGE5_VPLL,
> + PAGE6_DSI_CNTL2,
> + PAGE7_SPI_CNTL,
> + MAX_DEVS
> +};
> +
> +enum ps8640_vdo_control {
> + DISABLE = VDO_DIS,
> + ENABLE = VDO_EN,
> +};
> +
> +struct ps8640 {
> + struct drm_bridge bridge;
> + struct drm_bridge *panel_bridge;
> + struct mipi_dsi_device *dsi;
> + struct i2c_client *page[MAX_DEVS];
> + struct regulator_bulk_data supplies[2];
> + struct gpio_desc *gpio_reset;
> + struct gpio_desc *gpio_powerdown;
> +};
> +
> +static inline struct ps8640 *bridge_to_ps8640(struct drm_bridge *e)
> +{
> + return container_of(e, struct ps8640, bridge);
> +}
> +
> +static int ps8640_bridge_vdo_control(struct ps8640 *ps_bridge,
> + const enum ps8640_vdo_control ctrl)
> +{
> + struct i2c_client *client = ps_bridge->page[PAGE3_DSI_CNTL1];
> + u8 vdo_ctrl_buf[] = { VDO_CTL_ADD, ctrl };
> + int ret;
> +
> + ret = i2c_smbus_write_i2c_block_data(client, PAGE3_SET_ADD,
> + sizeof(vdo_ctrl_buf),
> + vdo_ctrl_buf);
> + if (ret < 0)
> + return ret;
> +
> + return 0;
> +}
> +
> +static void ps8640_pre_enable(struct drm_bridge *bridge)
> +{
> + struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
> + struct i2c_client *client = ps_bridge->page[PAGE2_TOP_CNTL];
> + unsigned long timeout;
> + int ret, status;
> +
> + ret = regulator_bulk_enable(ARRAY_SIZE(ps_bridge->supplies),
> + ps_bridge->supplies);
> + if (ret < 0) {
> + DRM_ERROR("cannot enable regulators %d\n", ret);
> + return;
> + }
> +
> + gpiod_set_value(ps_bridge->gpio_powerdown, 1);
> + gpiod_set_value(ps_bridge->gpio_reset, 0);
> + usleep_range(2000, 2500);
> + gpiod_set_value(ps_bridge->gpio_reset, 1);
> +
> + /*
> + * Wait for the ps8640 embedded MCU to be ready
> + * First wait 200ms and then check the MCU ready flag every 20ms
> + */
> + msleep(200);
> +
> + timeout = jiffies + msecs_to_jiffies(200) + 1;
> +
> + while (time_is_after_jiffies(timeout)) {
> + status = i2c_smbus_read_byte_data(client, PAGE2_GPIO_H);
> + if (status < 0) {
> + DRM_ERROR("failed read PAGE2_GPIO_H: %d\n", status);
> + goto err_regulators_disable;
> + }
> + if ((status & PS_GPIO9) == PS_GPIO9)
> + break;
> +
> + msleep(20);
> + }
> +
> + msleep(50);
> +
> + /*
> + * The Manufacturer Command Set (MCS) is a device dependent interface
> + * intended for factory programming of the display module default
> + * parameters. Once the display module is configured, the MCS shall be
> + * disabled by the manufacturer. Once disabled, all MCS commands are
> + * ignored by the display interface.
> + */
> + status = i2c_smbus_read_byte_data(client, PAGE2_MCS_EN);
> + if (status < 0) {
> + DRM_ERROR("failed read PAGE2_MCS_EN: %d\n", status);
> + goto err_regulators_disable;
> + }
> +
> + ret = i2c_smbus_write_byte_data(client, PAGE2_MCS_EN,
> + status & ~MCS_EN);
> + if (ret < 0) {
> + DRM_ERROR("failed write PAGE2_MCS_EN: %d\n", ret);
> + goto err_regulators_disable;
> + }
> +
> + ret = ps8640_bridge_vdo_control(ps_bridge, ENABLE);
That's much better than mute/unmute!
> + if (ret) {
> + DRM_ERROR("failed to enable VDO: %d\n", ret);
> + goto err_regulators_disable;
> + }
> +
> + /* Switch access edp panel's edid through i2c */
> + ret = i2c_smbus_write_byte_data(client, PAGE2_I2C_BYPASS,
> + I2C_BYPASS_EN);
> + if (ret < 0) {
> + DRM_ERROR("failed write PAGE2_I2C_BYPASS: %d\n", ret);
> + goto err_regulators_disable;
> + }
> +
> + return;
> +
> +err_regulators_disable:
> + regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
> + ps_bridge->supplies);
> +}
> +
> +static void ps8640_post_disable(struct drm_bridge *bridge)
> +{
> + struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
> + int ret;
> +
> + ret = ps8640_bridge_vdo_control(ps_bridge, DISABLE);
> + if (ret < 0)
> + DRM_ERROR("failed to disable VDO: %d\n", ret);
> +
> + gpiod_set_value(ps_bridge->gpio_reset, 0);
> + gpiod_set_value(ps_bridge->gpio_powerdown, 0);
> + ret = regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
> + ps_bridge->supplies);
> + if (ret < 0)
> + DRM_ERROR("cannot disable regulators %d\n", ret);
> +}
> +
> +int ps8640_bridge_attach(struct drm_bridge *bridge)
Compiling this with static analyzers says this should be 'static'.
> +{
> + struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
> + struct device *dev = &ps_bridge->page[0]->dev;
> + struct device_node *in_ep, *dsi_node;
> + struct mipi_dsi_device *dsi;
> + struct mipi_dsi_host *host;
> + int ret;
> + const struct mipi_dsi_device_info info = { .type = "ps8640",
> + .channel = 0,
> + .node = NULL,
> + };
> + /* port@0 is ps8640 dsi input port */
> + in_ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
> + if (!in_ep)
> + return -ENODEV;
> +
> + dsi_node = of_graph_get_remote_port_parent(in_ep);
> + of_node_put(in_ep);
> + if (!dsi_node)
> + return -ENODEV;
> +
> + host = of_find_mipi_dsi_host_by_node(dsi_node);
> + of_node_put(dsi_node);
> + if (!host)
> + return -ENODEV;
> +
> + dsi = mipi_dsi_device_register_full(host, &info);
> + if (IS_ERR(dsi)) {
> + dev_err(dev, "failed to create dsi device\n");
> + ret = PTR_ERR(dsi);
> + return ret;
> + }
> +
> + ps_bridge->dsi = dsi;
> +
> + dsi->host = host;
> + dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
> + MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
> + dsi->format = MIPI_DSI_FMT_RGB888;
> + dsi->lanes = 4;
I'm not an expert here, so maybe this makes no sense:
are you sure you don't need to take the number of lanes from the
device-tree?
From the yaml spec:
"""
The device accepts a single channel of
MIPI DSI v1.1, with up to four lanes [..]
"""
If it's OK to hardcode to 4, maybe use a macro for clarity?
> + ret = mipi_dsi_attach(dsi);
> + if (ret)
> + goto err_dsi_attach;
> +
> + /* Attach the panel-bridge to the dsi bridge */
> + return drm_bridge_attach(bridge->encoder, ps_bridge->panel_bridge,
> + &ps_bridge->bridge);
> +
> +err_dsi_attach:
> + mipi_dsi_device_unregister(dsi);
> + return ret;
> +}
> +
> +static const struct drm_bridge_funcs ps8640_bridge_funcs = {
> + .attach = ps8640_bridge_attach,
> + .post_disable = ps8640_post_disable,
> + .pre_enable = ps8640_pre_enable,
> +};
> +
> +static int ps8640_probe(struct i2c_client *client)
> +{
> + struct device *dev = &client->dev;
> + struct device_node *np = dev->of_node;
> + struct ps8640 *ps_bridge;
> + struct drm_panel *panel;
> + int ret;
> + u32 i;
> +
> + ps_bridge = devm_kzalloc(dev, sizeof(*ps_bridge), GFP_KERNEL);
> + if (!ps_bridge)
> + return -ENOMEM;
> +
> + /* port@1 is ps8640 output port */
Hm, regarding my comment on patch 1/2 about required port@0,
perhaps this really requires both port@0 and port@1.
> + ret = drm_of_find_panel_or_bridge(np, 1, 0, &panel, NULL);
> + if (ret < 0)
> + return ret;
> + if (!panel)
> + return -ENODEV;
> +
> + panel->connector_type = DRM_MODE_CONNECTOR_eDP;
> +
> + ps_bridge->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
> + if (IS_ERR(ps_bridge->panel_bridge))
> + return PTR_ERR(ps_bridge->panel_bridge);
> +
> + ps_bridge->supplies[0].supply = "vdd33";
> + ps_bridge->supplies[1].supply = "vdd12";
> + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ps_bridge->supplies),
> + ps_bridge->supplies);
> + if (ret)
> + return ret;
> +
> + ps_bridge->gpio_powerdown = devm_gpiod_get(&client->dev, "powerdown",
> + GPIOD_OUT_LOW);
> + if (IS_ERR(ps_bridge->gpio_powerdown))
> + return PTR_ERR(ps_bridge->gpio_powerdown);
> +
> + /*
> + * Request the reset pin low to avoid the bridge being
> + * initialized prematurely
> + */
> + ps_bridge->gpio_reset = devm_gpiod_get(&client->dev, "reset",
> + GPIOD_OUT_LOW);
> + if (IS_ERR(ps_bridge->gpio_reset))
> + return PTR_ERR(ps_bridge->gpio_reset);
> +
> + ps_bridge->bridge.funcs = &ps8640_bridge_funcs;
> + ps_bridge->bridge.of_node = dev->of_node;
> +
> + ps_bridge->page[PAGE0_DP_CNTL] = client;
> +
> + for (i = 1; i < ARRAY_SIZE(ps_bridge->page); i++) {
> + ps_bridge->page[i] = devm_i2c_new_dummy_device(&client->dev,
> + client->adapter,
> + client->addr + i);
> + if (IS_ERR(ps_bridge->page[i])) {
> + dev_err(dev, "failed i2c dummy device, address %02x\n",
> + client->addr + i);
> + return PTR_ERR(ps_bridge->page[i]);
> + }
> + }
> +
> + i2c_set_clientdata(client, ps_bridge);
> +
> + drm_bridge_add(&ps_bridge->bridge);
> +
> + return 0;
> +}
> +
> +static int ps8640_remove(struct i2c_client *client)
> +{
> + struct ps8640 *ps_bridge = i2c_get_clientdata(client);
> +
> + drm_bridge_remove(&ps_bridge->bridge);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id ps8640_match[] = {
> + { .compatible = "parade,ps8640" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, ps8640_match);
> +
> +static struct i2c_driver ps8640_driver = {
> + .probe_new = ps8640_probe,
> + .remove = ps8640_remove,
> + .driver = {
> + .name = "ps8640",
> + .of_match_table = ps8640_match,
> + },
> +};
> +module_i2c_driver(ps8640_driver);
> +
> +MODULE_AUTHOR("Jitao Shi <[email protected]>");
> +MODULE_AUTHOR("CK Hu <[email protected]>");
> +MODULE_AUTHOR("Enric Balletbo i Serra <[email protected]>");
> +MODULE_DESCRIPTION("PARADE ps8640 DSI-eDP converter driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.20.1
>
>
Hi Ezequiel,
On 26/12/19 15:27, Ezequiel Garcia wrote:
> Hi Enric, Rob,
>
> On Mon, 2019-12-23 at 15:35 +0100, Enric Balletbo i Serra wrote:
>> From: Jitao Shi <[email protected]>
>>
>> Add documentation for DT properties supported by
>> ps8640 DSI-eDP converter.
>>
>> Signed-off-by: Jitao Shi <[email protected]>
>> Acked-by: Rob Herring <[email protected]>
>> Reviewed-by: Philipp Zabel <[email protected]>
>> Signed-off-by: Ulrich Hecht <[email protected]>
>> Signed-off-by: Enric Balletbo i Serra <[email protected]>
> [..]
>> +
>> + ports:
>> + type: object
>> + description:
>> + A node containing DSI input & output port nodes with endpoint
>> + definitions as documented in
>> + Documentation/devicetree/bindings/media/video-interfaces.txt
>> + Documentation/devicetree/bindings/graph.txt
>> + properties:
>> + port@0:
>> + type: object
>> + description: |
>> + Video port for DSI input
>> +
>> + port@1:
>> + type: object
>> + description: |
>> + Video port for eDP output (panel or connector).
>> +
>> + required:
>> + - port@0
>> +
>
> Is it correct to require port@0 ? This could be called port@1
> or port@2, and IIUC it should bind the same.
>
My understanding is that at least the Video port for DSI input is required,
which makes sense, otherwise you have the chip connected nowhere. port@1 is
optional because it could be connected to a eDP panel or can just be a connector.
About your second question, I am not sure I understand you. You mean that have a
DT like this should work?
ports {
#address-cells = <1>;
#size-cells = <0>;
port@1 {
reg = <0>;
ps8640_in: endpoint {
remote-endpoint = <&dsi0_out>;
};
};
port@2 {
reg = <1>;
ps8640_out: endpoint {
remote-endpoint = <&panel_in>;
};
};
};
Probably yes, because the driver what really looks is the register value, but
that's odd and probably a bad practice. Also if I am not wrong the convention is
name the nodes with port@<reg property> (like we do in i2c devices for example)
port@0 is the label that has the register value to 0.
port@1 is the label that has the register value to 1.
...
Thanks,
Enric
> Thanks,
> Ezequiel
>
>> +required:
>> + - compatible
>> + - reg
>> + - powerdown-gpios
>> + - reset-gpios
>> + - vdd12-supply
>> + - vdd33-supply
>> + - ports
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> + - |
>> + #include <dt-bindings/gpio/gpio.h>
>> + i2c0 {
>> + #address-cells = <1>;
>> + #size-cells = <0>;
>> +
>> + ps8640: edp-bridge@18 {
>> + compatible = "parade,ps8640";
>> + reg = <0x18>;
>> + powerdown-gpios = <&pio 116 GPIO_ACTIVE_LOW>;
>> + reset-gpios = <&pio 115 GPIO_ACTIVE_LOW>;
>> + vdd12-supply = <&ps8640_fixed_1v2>;
>> + vdd33-supply = <&mt6397_vgp2_reg>;
>> +
>> + ports {
>> + #address-cells = <1>;
>> + #size-cells = <0>;
>> +
>> + port@0 {
>> + reg = <0>;
>> + ps8640_in: endpoint {
>> + remote-endpoint = <&dsi0_out>;
>> + };
>> + };
>> +
>> + port@1 {
>> + reg = <1>;
>> + ps8640_out: endpoint {
>> + remote-endpoint = <&panel_in>;
>> + };
>> + };
>> + };
>> + };
>> + };
>> +
>> --
>> 2.20.1
>>
>>
>
>
>
Hi Ezequiel,
On 26/12/19 17:38, Ezequiel Garcia wrote:
> Hi Enric,
>
> Note that this series is marked as v22, but it's really the 23th.
> Some minor comments below, it's looking really now.
>
> Reviewed-by: Ezequiel Garcia <[email protected]>
>
> On Mon, 2019-12-23 at 15:35 +0100, Enric Balletbo i Serra wrote:
>> From: Jitao Shi <[email protected]>
>>
>> This patch adds drm_bridge driver for parade DSI to eDP bridge chip.
>>
>> Signed-off-by: Jitao Shi <[email protected]>
>> Reviewed-by: Daniel Kurtz <[email protected]>
>> [uli: followed API changes, removed FW update feature]
>> Signed-off-by: Ulrich Hecht <[email protected]>
>> Signed-off-by: Enric Balletbo i Serra <[email protected]>
>> Tested-by: Hsin-Yi Wang <[email protected]>
>> ---
>> One of the reviews from Laurent was to use 'i2c_new_ancillary_device'. I
>> didn't change this for two reasons.
>> 1) It doesn't have a devm version, so the remove path is more simple
>> using the devm_i2c_new_dummy_device family.
>> 2) IIUC the ancillary function is useful when you want to retrieve the
>> address from the firmware or DT, that's not really the case here, as we
>> have a base address and fixed offset to the base address which I think
>> is not configurable.
>>
>> Let me know if you still think that I should use the ancillary call.
>>
>> Changes in v23:
>> - Merge mute/unmute functions into one (Nicolas Boichat)
>> - Use enum for ENABLE/DISABLE instead of bool (Ezequiel Garcia)
>> - Rename mute/unmute to vdo_control and fix error messages (Nicolas Boichat and Enric)
>> - Add space between address and address parameter 'address%02x' (Nicolas Boichat)
>> - Add Tested-by Hsin-Yi
>> - Added me as author after the refactor
>>
>> Changes in v22:
>> - Remove sysfs attributes because are not really used (Enric Balletbo)
>> - Use enum for address page offsets (Ezequiel Garcia)
>> - Remove enable tracking (Enric Balletbo)
>> - Use panel_bridge API (Laurent Pinchart)
>> - Do not use kernel-doc format for non kernel-doc formatted commands (Enric Balletbo)
>> - Remove verbose message for PAGE1_VSTART command (Ezequiel Garcia)
>> - Use time_is_after_jiffies idiom (Ezequiel Garcia)
>> - Remove unused macros (Ezequiel Garcia)
>> - Fix weird alignment in dsi->mode_flags (Laurent Pinchart)
>> - Use drm_of_find_panel_or_bridge helper (Laurent Pinchart)
>> - Remove mode-sel-gpios as is not used (Laurent Pinchart)
>> - Remove error messages to get gpios as the core will already report it (Enric Balletbo)
>> - Remove redundant message getting the regulators (Laurent Pinchart)
>> - Rename sleep-gpios to powerdown-gpios (Laurent Pinchart)
>> - Use ARRAY_SIZE(ps_bridge->page) instead of MAX_DEV when possible (Laurent Pinchart)
>> - Fix race with userspace accessing the sysfs attributes (Laurent Pinchart)
>> - Remove id_table as is only used on DR platforms (Laurent Pinchart)
>> - Convert to new i2c device probe() (Laurent Pinchart)
>> - Use i2c_smbus_read/write helpers instead of open coding it (Laurent Pinchart)
>> - Remove unnused global variables (Laurent Pinchart)
>> - Remove unnused fields in ps8640 struct (Laurent Pinchart)
>> - Remove commented-out headers (Laurent Pinchart)
>>
>> Changes in v21:
>> - Use devm_i2c_new_dummy_device and fix build issue using deprecated i2c_new_dummy
>> - Fix build issue due missing drm_bridge.h
>> - Do not remove in ps8640_remove device managed resources
>>
>> Changes in v19:
>> - fixed return value of ps8640_probe() when no panel is found
>>
>> Changes in v18:
>> - followed DRM API changes
>> - use DEVICE_ATTR_RO()
>> - remove firmware update code
>> - add SPDX identifier
>>
>> Changes in v17:
>> - remove some unused head files.
>> - add macros for ps8640 pages.
>> - remove ddc_i2c client
>> - add mipi_dsi_device_register_full
>> - remove the manufacturer from the name and i2c_device_id
>>
>> Changes in v16:
>> - Disable ps8640 DSI MCS Function.
>> - Rename gpios name more clearly.
>> - Tune the ps8640 power on sequence.
>>
>> Changes in v15:
>> - Drop drm_connector_(un)register calls from parade ps8640.
>> The main DRM driver mtk_drm_drv now calls
>> drm_connector_register_all() after drm_dev_register() in the
>> mtk_drm_bind() function. That function should iterate over all
>> connectors and call drm_connector_register() for each of them.
>> So, remove drm_connector_(un)register calls from parade ps8640.
>>
>> Changes in v14:
>> - update copyright info.
>> - change bridge_to_ps8640 and connector_to_ps8640 to inline function.
>> - fix some coding style.
>> - use sizeof as array counter.
>> - use drm_get_edid when read edid.
>> - add mutex when firmware updating.
>>
>> Changes in v13:
>> - add const on data, ps8640_write_bytes(struct i2c_client *client, const u8 *data, u16 data_len)
>> - fix PAGE2_SW_REST tyro.
>> - move the buf[3] init to entrance of the function.
>>
>> Changes in v12:
>> - fix hw_chip_id build warning
>>
>> Changes in v11:
>> - Remove depends on I2C, add DRM depends
>> - Reuse ps8640_write_bytes() in ps8640_write_byte()
>> - Use timer check for polling like the routines in <linux/iopoll.h>
>> - Fix no drm_connector_unregister/drm_connector_cleanup when ps8640_bridge_attach fail
>> - Check the ps8640 hardware id in ps8640_validate_firmware
>> - Remove fw_version check
>> - Move ps8640_validate_firmware before ps8640_enter_bl
>> - Add ddc_i2c unregister when probe fail and ps8640_remove
>>
>> drivers/gpu/drm/bridge/Kconfig | 11 +
>> drivers/gpu/drm/bridge/Makefile | 1 +
>> drivers/gpu/drm/bridge/parade-ps8640.c | 348 +++++++++++++++++++++++++
>> 3 files changed, 360 insertions(+)
>> create mode 100644 drivers/gpu/drm/bridge/parade-ps8640.c
>>
>> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
>> index 4734f6993858..3e0a63011723 100644
>> --- a/drivers/gpu/drm/bridge/Kconfig
>> +++ b/drivers/gpu/drm/bridge/Kconfig
>> @@ -101,6 +101,17 @@ config DRM_PARADE_PS8622
>> ---help---
>> Parade eDP-LVDS bridge chip driver.
>>
>> +config DRM_PARADE_PS8640
>> + tristate "Parade PS8640 MIPI DSI to eDP Converter"
>
> Not a showstopper, but perhaps later you can amend the other
> Parade bridge menuconfig entry. Right now it's
> "Parade eDP/LVDS bridge". It would be nice to have
> consistency between Parade bridges.
>
>> + depends on OF
>> + select DRM_KMS_HELPER
>> + select DRM_MIPI_DSI
>> + select DRM_PANEL
>> + help
>> + Choose this option if you have PS8640 for display
>> + The PS8640 is a high-performance and low-power
>> + MIPI DSI to eDP converter
>> +
>> config DRM_SIL_SII8620
>> tristate "Silicon Image SII8620 HDMI/MHL bridge"
>> depends on OF
>> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
>> index 1c0c92667ac4..91490c595b38 100644
>> --- a/drivers/gpu/drm/bridge/Makefile
>> +++ b/drivers/gpu/drm/bridge/Makefile
>> @@ -8,6 +8,7 @@ obj-$(CONFIG_DRM_LVDS_ENCODER) += lvds-encoder.o
>> obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
>> obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
>> obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
>> +obj-$(CONFIG_DRM_PARADE_PS8640) += parade-ps8640.o
>> obj-$(CONFIG_DRM_SIL_SII8620) += sil-sii8620.o
>> obj-$(CONFIG_DRM_SII902X) += sii902x.o
>> obj-$(CONFIG_DRM_SII9234) += sii9234.o
>> diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
>> new file mode 100644
>> index 000000000000..646ac649d175
>> --- /dev/null
>> +++ b/drivers/gpu/drm/bridge/parade-ps8640.c
>> @@ -0,0 +1,348 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Copyright (c) 2016 MediaTek Inc.
>> + */
>> +
>> +#include <linux/delay.h>
>> +#include <linux/err.h>
>> +#include <linux/gpio/consumer.h>
>> +#include <linux/i2c.h>
>> +#include <linux/module.h>
>> +#include <linux/of_graph.h>
>> +#include <linux/regulator/consumer.h>
>> +
>> +#include <drm/drm_bridge.h>
>> +#include <drm/drm_mipi_dsi.h>
>> +#include <drm/drm_of.h>
>> +#include <drm/drm_panel.h>
>> +#include <drm/drm_print.h>
>> +
>> +#define PAGE2_GPIO_H 0xa7
>> +#define PS_GPIO9 BIT(1)
>> +#define PAGE2_I2C_BYPASS 0xea
>> +#define I2C_BYPASS_EN 0xd0
>> +#define PAGE2_MCS_EN 0xf3
>> +#define MCS_EN BIT(0)
>> +#define PAGE3_SET_ADD 0xfe
>> +#define VDO_CTL_ADD 0x13
>> +#define VDO_DIS 0x18
>> +#define VDO_EN 0x1c
>> +
>> +/*
>> + * PS8640 uses multiple addresses:
>> + * page[0]: for DP control
>> + * page[1]: for VIDEO Bridge
>> + * page[2]: for control top
>> + * page[3]: for DSI Link Control1
>> + * page[4]: for MIPI Phy
>> + * page[5]: for VPLL
>> + * page[6]: for DSI Link Control2
>> + * page[7]: for SPI ROM mapping
>> + */
>> +enum page_addr_offset {
>> + PAGE0_DP_CNTL = 0,
>> + PAGE1_VDO_BDG,
>> + PAGE2_TOP_CNTL,
>> + PAGE3_DSI_CNTL1,
>> + PAGE4_MIPI_PHY,
>> + PAGE5_VPLL,
>> + PAGE6_DSI_CNTL2,
>> + PAGE7_SPI_CNTL,
>> + MAX_DEVS
>> +};
>> +
>> +enum ps8640_vdo_control {
>> + DISABLE = VDO_DIS,
>> + ENABLE = VDO_EN,
>> +};
>> +
>> +struct ps8640 {
>> + struct drm_bridge bridge;
>> + struct drm_bridge *panel_bridge;
>> + struct mipi_dsi_device *dsi;
>> + struct i2c_client *page[MAX_DEVS];
>> + struct regulator_bulk_data supplies[2];
>> + struct gpio_desc *gpio_reset;
>> + struct gpio_desc *gpio_powerdown;
>> +};
>> +
>> +static inline struct ps8640 *bridge_to_ps8640(struct drm_bridge *e)
>> +{
>> + return container_of(e, struct ps8640, bridge);
>> +}
>> +
>> +static int ps8640_bridge_vdo_control(struct ps8640 *ps_bridge,
>> + const enum ps8640_vdo_control ctrl)
>> +{
>> + struct i2c_client *client = ps_bridge->page[PAGE3_DSI_CNTL1];
>> + u8 vdo_ctrl_buf[] = { VDO_CTL_ADD, ctrl };
>> + int ret;
>> +
>> + ret = i2c_smbus_write_i2c_block_data(client, PAGE3_SET_ADD,
>> + sizeof(vdo_ctrl_buf),
>> + vdo_ctrl_buf);
>> + if (ret < 0)
>> + return ret;
>> +
>> + return 0;
>> +}
>> +
>> +static void ps8640_pre_enable(struct drm_bridge *bridge)
>> +{
>> + struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
>> + struct i2c_client *client = ps_bridge->page[PAGE2_TOP_CNTL];
>> + unsigned long timeout;
>> + int ret, status;
>> +
>> + ret = regulator_bulk_enable(ARRAY_SIZE(ps_bridge->supplies),
>> + ps_bridge->supplies);
>> + if (ret < 0) {
>> + DRM_ERROR("cannot enable regulators %d\n", ret);
>> + return;
>> + }
>> +
>> + gpiod_set_value(ps_bridge->gpio_powerdown, 1);
>> + gpiod_set_value(ps_bridge->gpio_reset, 0);
>> + usleep_range(2000, 2500);
>> + gpiod_set_value(ps_bridge->gpio_reset, 1);
>> +
>> + /*
>> + * Wait for the ps8640 embedded MCU to be ready
>> + * First wait 200ms and then check the MCU ready flag every 20ms
>> + */
>> + msleep(200);
>> +
>> + timeout = jiffies + msecs_to_jiffies(200) + 1;
>> +
>> + while (time_is_after_jiffies(timeout)) {
>> + status = i2c_smbus_read_byte_data(client, PAGE2_GPIO_H);
>> + if (status < 0) {
>> + DRM_ERROR("failed read PAGE2_GPIO_H: %d\n", status);
>> + goto err_regulators_disable;
>> + }
>> + if ((status & PS_GPIO9) == PS_GPIO9)
>> + break;
>> +
>> + msleep(20);
>> + }
>> +
>> + msleep(50);
>> +
>> + /*
>> + * The Manufacturer Command Set (MCS) is a device dependent interface
>> + * intended for factory programming of the display module default
>> + * parameters. Once the display module is configured, the MCS shall be
>> + * disabled by the manufacturer. Once disabled, all MCS commands are
>> + * ignored by the display interface.
>> + */
>> + status = i2c_smbus_read_byte_data(client, PAGE2_MCS_EN);
>> + if (status < 0) {
>> + DRM_ERROR("failed read PAGE2_MCS_EN: %d\n", status);
>> + goto err_regulators_disable;
>> + }
>> +
>> + ret = i2c_smbus_write_byte_data(client, PAGE2_MCS_EN,
>> + status & ~MCS_EN);
>> + if (ret < 0) {
>> + DRM_ERROR("failed write PAGE2_MCS_EN: %d\n", ret);
>> + goto err_regulators_disable;
>> + }
>> +
>> + ret = ps8640_bridge_vdo_control(ps_bridge, ENABLE);
>
> That's much better than mute/unmute!
>
>> + if (ret) {
>> + DRM_ERROR("failed to enable VDO: %d\n", ret);
>> + goto err_regulators_disable;
>> + }
>> +
>> + /* Switch access edp panel's edid through i2c */
>> + ret = i2c_smbus_write_byte_data(client, PAGE2_I2C_BYPASS,
>> + I2C_BYPASS_EN);
>> + if (ret < 0) {
>> + DRM_ERROR("failed write PAGE2_I2C_BYPASS: %d\n", ret);
>> + goto err_regulators_disable;
>> + }
>> +
>> + return;
>> +
>> +err_regulators_disable:
>> + regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
>> + ps_bridge->supplies);
>> +}
>> +
>> +static void ps8640_post_disable(struct drm_bridge *bridge)
>> +{
>> + struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
>> + int ret;
>> +
>> + ret = ps8640_bridge_vdo_control(ps_bridge, DISABLE);
>> + if (ret < 0)
>> + DRM_ERROR("failed to disable VDO: %d\n", ret);
>> +
>> + gpiod_set_value(ps_bridge->gpio_reset, 0);
>> + gpiod_set_value(ps_bridge->gpio_powerdown, 0);
>> + ret = regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
>> + ps_bridge->supplies);
>> + if (ret < 0)
>> + DRM_ERROR("cannot disable regulators %d\n", ret);
>> +}
>> +
>> +int ps8640_bridge_attach(struct drm_bridge *bridge)
>
> Compiling this with static analyzers says this should be 'static'.
>
Ack, done in next version.
>> +{
>> + struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
>> + struct device *dev = &ps_bridge->page[0]->dev;
>> + struct device_node *in_ep, *dsi_node;
>> + struct mipi_dsi_device *dsi;
>> + struct mipi_dsi_host *host;
>> + int ret;
>> + const struct mipi_dsi_device_info info = { .type = "ps8640",
>> + .channel = 0,
>> + .node = NULL,
>> + };
>> + /* port@0 is ps8640 dsi input port */
>> + in_ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
>> + if (!in_ep)
>> + return -ENODEV;
>> +
>> + dsi_node = of_graph_get_remote_port_parent(in_ep);
>> + of_node_put(in_ep);
>> + if (!dsi_node)
>> + return -ENODEV;
>> +
>> + host = of_find_mipi_dsi_host_by_node(dsi_node);
>> + of_node_put(dsi_node);
>> + if (!host)
>> + return -ENODEV;
>> +
>> + dsi = mipi_dsi_device_register_full(host, &info);
>> + if (IS_ERR(dsi)) {
>> + dev_err(dev, "failed to create dsi device\n");
>> + ret = PTR_ERR(dsi);
>> + return ret;
>> + }
>> +
>> + ps_bridge->dsi = dsi;
>> +
>> + dsi->host = host;
>> + dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
>> + MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
>> + dsi->format = MIPI_DSI_FMT_RGB888;
>> + dsi->lanes = 4;
>
> I'm not an expert here, so maybe this makes no sense:
> are you sure you don't need to take the number of lanes from the
> device-tree?
>
For the comment below looks like it might be configurable, yes, but like you I
don't have the datasheet so I can't really answer.
> From the yaml spec:
>
> """
> The device accepts a single channel of
> MIPI DSI v1.1, with up to four lanes [..]
> """
>
> If it's OK to hardcode to 4, maybe use a macro for clarity?
>
Ok, I'll wait for if anyone can confirm, and if not I'll hardcode the value as
is known to workand the use case I can test.
>> + ret = mipi_dsi_attach(dsi);
>> + if (ret)
>> + goto err_dsi_attach;
>> +
>> + /* Attach the panel-bridge to the dsi bridge */
>> + return drm_bridge_attach(bridge->encoder, ps_bridge->panel_bridge,
>> + &ps_bridge->bridge);
>> +
>> +err_dsi_attach:
>> + mipi_dsi_device_unregister(dsi);
>> + return ret;
>> +}
>> +
>> +static const struct drm_bridge_funcs ps8640_bridge_funcs = {
>> + .attach = ps8640_bridge_attach,
>> + .post_disable = ps8640_post_disable,
>> + .pre_enable = ps8640_pre_enable,
>> +};
>> +
>> +static int ps8640_probe(struct i2c_client *client)
>> +{
>> + struct device *dev = &client->dev;
>> + struct device_node *np = dev->of_node;
>> + struct ps8640 *ps_bridge;
>> + struct drm_panel *panel;
>> + int ret;
>> + u32 i;
>> +
>> + ps_bridge = devm_kzalloc(dev, sizeof(*ps_bridge), GFP_KERNEL);
>> + if (!ps_bridge)
>> + return -ENOMEM;
>> +
>> + /* port@1 is ps8640 output port */
>
> Hm, regarding my comment on patch 1/2 about required port@0,
> perhaps this really requires both port@0 and port@1.
>
As I commented on patch 1/2 to your question, I am not sure about if port@1 is
required or not. My understanding is that no, but I might be wrong. What is true
is that the code below only covers the case where a panel is connected and fails
otherwise. You can also have another bridge (not covered by the below code), or
just a connector so I am not sure whether I should support all the possible
cases or just support the ones I can test for now.
Will wait for the DRM experts here to know how to proceed.
Thanks,
Enric
>> + ret = drm_of_find_panel_or_bridge(np, 1, 0, &panel, NULL);
>> + if (ret < 0)
>> + return ret;
>> + if (!panel)
>> + return -ENODEV;
>> +
>> + panel->connector_type = DRM_MODE_CONNECTOR_eDP;
>> +
>> + ps_bridge->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
>> + if (IS_ERR(ps_bridge->panel_bridge))
>> + return PTR_ERR(ps_bridge->panel_bridge);
>> +
>> + ps_bridge->supplies[0].supply = "vdd33";
>> + ps_bridge->supplies[1].supply = "vdd12";
>> + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ps_bridge->supplies),
>> + ps_bridge->supplies);
>> + if (ret)
>> + return ret;
>> +
>> + ps_bridge->gpio_powerdown = devm_gpiod_get(&client->dev, "powerdown",
>> + GPIOD_OUT_LOW);
>> + if (IS_ERR(ps_bridge->gpio_powerdown))
>> + return PTR_ERR(ps_bridge->gpio_powerdown);
>> +
>> + /*
>> + * Request the reset pin low to avoid the bridge being
>> + * initialized prematurely
>> + */
>> + ps_bridge->gpio_reset = devm_gpiod_get(&client->dev, "reset",
>> + GPIOD_OUT_LOW);
>> + if (IS_ERR(ps_bridge->gpio_reset))
>> + return PTR_ERR(ps_bridge->gpio_reset);
>> +
>> + ps_bridge->bridge.funcs = &ps8640_bridge_funcs;
>> + ps_bridge->bridge.of_node = dev->of_node;
>> +
>> + ps_bridge->page[PAGE0_DP_CNTL] = client;
>> +
>> + for (i = 1; i < ARRAY_SIZE(ps_bridge->page); i++) {
>> + ps_bridge->page[i] = devm_i2c_new_dummy_device(&client->dev,
>> + client->adapter,
>> + client->addr + i);
>> + if (IS_ERR(ps_bridge->page[i])) {
>> + dev_err(dev, "failed i2c dummy device, address %02x\n",
>> + client->addr + i);
>> + return PTR_ERR(ps_bridge->page[i]);
>> + }
>> + }
>> +
>> + i2c_set_clientdata(client, ps_bridge);
>> +
>> + drm_bridge_add(&ps_bridge->bridge);
>> +
>> + return 0;
>> +}
>> +
>> +static int ps8640_remove(struct i2c_client *client)
>> +{
>> + struct ps8640 *ps_bridge = i2c_get_clientdata(client);
>> +
>> + drm_bridge_remove(&ps_bridge->bridge);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct of_device_id ps8640_match[] = {
>> + { .compatible = "parade,ps8640" },
>> + { }
>> +};
>> +MODULE_DEVICE_TABLE(of, ps8640_match);
>> +
>> +static struct i2c_driver ps8640_driver = {
>> + .probe_new = ps8640_probe,
>> + .remove = ps8640_remove,
>> + .driver = {
>> + .name = "ps8640",
>> + .of_match_table = ps8640_match,
>> + },
>> +};
>> +module_i2c_driver(ps8640_driver);
>> +
>> +MODULE_AUTHOR("Jitao Shi <[email protected]>");
>> +MODULE_AUTHOR("CK Hu <[email protected]>");
>> +MODULE_AUTHOR("Enric Balletbo i Serra <[email protected]>");
>> +MODULE_DESCRIPTION("PARADE ps8640 DSI-eDP converter driver");
>> +MODULE_LICENSE("GPL v2");
>> --
>> 2.20.1
>>
>>
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