The Innolux P079ZCA is a 7.85" panel with a 768X1024 resolution and
connected to DSI using four lanes.
Signed-off-by: Chris Zhong <[email protected]>
---
Changes in v2: None
.../bindings/display/panel/innolux,p079zca.txt | 23 ++++++++++++++++++++++
1 file changed, 23 insertions(+)
create mode 100644 Documentation/devicetree/bindings/display/panel/innolux,p079zca.txt
diff --git a/Documentation/devicetree/bindings/display/panel/innolux,p079zca.txt b/Documentation/devicetree/bindings/display/panel/innolux,p079zca.txt
new file mode 100644
index 0000000..5c70a83
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/innolux,p079zca.txt
@@ -0,0 +1,23 @@
+Innolux P079ZCA 7.85" 768x1024 TFT LCD panel
+
+Required properties:
+- compatible: should be "innolux,p079zca"
+- reg: DSI virtual channel of the peripheral
+- power-supply: phandle of the regulator that provides the supply voltage
+- enable-gpios: panel enable gpio
+
+Optional properties:
+- backlight: phandle of the backlight device attached to the panel
+
+Example:
+
+ &mipi_dsi {
+ panel {
+ compatible = "innolux,p079zca";
+ reg = <0>;
+ power-supply = <...>;
+ backlight = <&backlight>;
+ enable-gpios = <&gpio1 13 GPIO_ACTIVE_HIGH>;
+ status = "okay";
+ };
+ };
--
2.6.3
Support Innolux P079ZCA 7.85" 768x1024 TFT LCD panel, it is a MIPI DSI
panel.
Signed-off-by: Chris Zhong <[email protected]>
---
Changes in v2:
- add some error check
- always use Low power mode to send commend
- add comments for all the sleep
- use DRM_DEV_ERROR instead of dev_err
drivers/gpu/drm/panel/Kconfig | 11 +
drivers/gpu/drm/panel/Makefile | 1 +
drivers/gpu/drm/panel/panel-innolux-p079zca.c | 344 ++++++++++++++++++++++++++
3 files changed, 356 insertions(+)
create mode 100644 drivers/gpu/drm/panel/panel-innolux-p079zca.c
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 62aba97..99dd010 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -18,6 +18,17 @@ config DRM_PANEL_SIMPLE
that it can be automatically turned off when the panel goes into a
low power state.
+config DRM_PANEL_INNOLUX_P079ZCA
+ tristate "Innolux P079ZCA panel"
+ depends on OF
+ depends on DRM_MIPI_DSI
+ depends on BACKLIGHT_CLASS_DEVICE
+ help
+ Say Y here if you want to enable support for Innolux P079ZCA
+ TFT-LCD modules. The panel has a 1024x768 resolution and uses
+ 24 bit RGB per pixel. It provides a MIPI DSI interface to
+ the host and has a built-in LED backlight.
+
config DRM_PANEL_JDI_LT070ME05000
tristate "JDI LT070ME05000 WUXGA DSI panel"
depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index a5c7ec0..bda2aa4 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -1,4 +1,5 @@
obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
+obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA) += panel-innolux-p079zca.o
obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o
obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o
obj-$(CONFIG_DRM_PANEL_PANASONIC_VVX10F034N00) += panel-panasonic-vvx10f034n00.o
diff --git a/drivers/gpu/drm/panel/panel-innolux-p079zca.c b/drivers/gpu/drm/panel/panel-innolux-p079zca.c
new file mode 100644
index 0000000..b8c34e0
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-innolux-p079zca.c
@@ -0,0 +1,344 @@
+/*
+ * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/backlight.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_panel.h>
+
+#include <video/mipi_display.h>
+
+struct innolux_panel {
+ struct drm_panel base;
+ struct mipi_dsi_device *link;
+
+ struct backlight_device *backlight;
+ struct regulator *supply;
+ struct gpio_desc *enable_gpio;
+
+ bool prepared;
+ bool enabled;
+};
+
+static inline struct innolux_panel *to_innolux_panel(struct drm_panel *panel)
+{
+ return container_of(panel, struct innolux_panel, base);
+}
+
+static int innolux_panel_disable(struct drm_panel *panel)
+{
+ struct innolux_panel *innolux = to_innolux_panel(panel);
+ int err;
+
+ if (!innolux->enabled)
+ return 0;
+
+ if (innolux->backlight) {
+ innolux->backlight->props.power = FB_BLANK_POWERDOWN;
+ backlight_update_status(innolux->backlight);
+ }
+
+ err = mipi_dsi_dcs_set_display_off(innolux->link);
+ if (err < 0)
+ DRM_DEV_ERROR(panel->dev, "failed to set display off: %d\n",
+ err);
+
+ innolux->enabled = false;
+
+ return 0;
+}
+
+static int innolux_panel_unprepare(struct drm_panel *panel)
+{
+ struct innolux_panel *innolux = to_innolux_panel(panel);
+ int err;
+
+ if (!innolux->prepared)
+ return 0;
+
+ err = mipi_dsi_dcs_enter_sleep_mode(innolux->link);
+ if (err < 0) {
+ DRM_DEV_ERROR(panel->dev, "failed to enter sleep mode: %d\n",
+ err);
+ return err;
+ }
+
+ gpiod_set_value_cansleep(innolux->enable_gpio, 0);
+
+ /* T8: 80ms - 1000ms */
+ msleep(80);
+
+ err = regulator_disable(innolux->supply);
+ if (err < 0)
+ return err;
+
+ innolux->prepared = false;
+
+ return 0;
+}
+
+static int innolux_panel_prepare(struct drm_panel *panel)
+{
+ struct innolux_panel *innolux = to_innolux_panel(panel);
+ int err, ret;
+
+ if (innolux->prepared)
+ return 0;
+
+ gpiod_set_value_cansleep(innolux->enable_gpio, 0);
+
+ err = regulator_enable(innolux->supply);
+ if (err < 0)
+ return err;
+
+ /* T2: 15ms - 1000ms */
+ usleep_range(15000, 16000);
+
+ gpiod_set_value_cansleep(innolux->enable_gpio, 1);
+
+ /* T4: 15ms - 1000ms */
+ usleep_range(15000, 16000);
+
+ err = mipi_dsi_dcs_exit_sleep_mode(innolux->link);
+ if (err < 0) {
+ DRM_DEV_ERROR(panel->dev, "failed to exit sleep mode: %d\n",
+ err);
+ goto poweroff;
+ }
+
+ /* T6: 120ms - 1000ms*/
+ msleep(120);
+
+ err = mipi_dsi_dcs_set_display_on(innolux->link);
+ if (err < 0) {
+ DRM_DEV_ERROR(panel->dev, "failed to set display on: %d\n",
+ err);
+ goto poweroff;
+ }
+
+ /* T7: 5ms */
+ usleep_range(5000, 6000);
+
+ innolux->prepared = true;
+
+ return 0;
+
+poweroff:
+ ret = regulator_disable(innolux->supply);
+ if (ret)
+ return ret;
+
+ gpiod_set_value_cansleep(innolux->enable_gpio, 0);
+ return err;
+}
+
+static int innolux_panel_enable(struct drm_panel *panel)
+{
+ struct innolux_panel *innolux = to_innolux_panel(panel);
+ int ret;
+
+ if (innolux->enabled)
+ return 0;
+
+ if (innolux->backlight) {
+ innolux->backlight->props.power = FB_BLANK_UNBLANK;
+ ret = backlight_update_status(innolux->backlight);
+ if (ret) {
+ DRM_DEV_ERROR(panel->drm->dev,
+ "Failed to enable backlight %d\n", ret);
+ return ret;
+ }
+ }
+
+ innolux->enabled = true;
+
+ return 0;
+}
+
+static const struct drm_display_mode default_mode = {
+ .clock = 56900,
+ .hdisplay = 768,
+ .hsync_start = 768 + 40,
+ .hsync_end = 768 + 40 + 40,
+ .htotal = 768 + 40 + 40 + 40,
+ .vdisplay = 1024,
+ .vsync_start = 1024 + 20,
+ .vsync_end = 1024 + 20 + 4,
+ .vtotal = 1024 + 20 + 4 + 20,
+ .vrefresh = 60,
+};
+
+static int innolux_panel_get_modes(struct drm_panel *panel)
+{
+ struct drm_display_mode *mode;
+
+ mode = drm_mode_duplicate(panel->drm, &default_mode);
+ if (!mode) {
+ DRM_DEV_ERROR(panel->drm->dev, "failed to add mode %ux%ux@%u\n",
+ default_mode.hdisplay, default_mode.vdisplay,
+ default_mode.vrefresh);
+ return -ENOMEM;
+ }
+
+ drm_mode_set_name(mode);
+
+ drm_mode_probed_add(panel->connector, mode);
+
+ panel->connector->display_info.width_mm = 120;
+ panel->connector->display_info.height_mm = 160;
+
+ return 1;
+}
+
+static const struct drm_panel_funcs innolux_panel_funcs = {
+ .disable = innolux_panel_disable,
+ .unprepare = innolux_panel_unprepare,
+ .prepare = innolux_panel_prepare,
+ .enable = innolux_panel_enable,
+ .get_modes = innolux_panel_get_modes,
+};
+
+static const struct of_device_id innolux_of_match[] = {
+ { .compatible = "innolux,p079zca", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, innolux_of_match);
+
+static int innolux_panel_add(struct innolux_panel *innolux)
+{
+ struct device *dev = &innolux->link->dev;
+ struct device_node *np;
+ int err;
+
+ innolux->supply = devm_regulator_get(dev, "power");
+ if (IS_ERR(innolux->supply))
+ return PTR_ERR(innolux->supply);
+
+ innolux->enable_gpio = devm_gpiod_get_optional(dev, "enable",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(innolux->enable_gpio)) {
+ err = PTR_ERR(innolux->enable_gpio);
+ dev_dbg(dev, "failed to get enable gpio: %d\n", err);
+ innolux->enable_gpio = NULL;
+ }
+
+ np = of_parse_phandle(dev->of_node, "backlight", 0);
+ if (np) {
+ innolux->backlight = of_find_backlight_by_node(np);
+ of_node_put(np);
+
+ if (!innolux->backlight)
+ return -EPROBE_DEFER;
+ }
+
+ drm_panel_init(&innolux->base);
+ innolux->base.funcs = &innolux_panel_funcs;
+ innolux->base.dev = &innolux->link->dev;
+
+ err = drm_panel_add(&innolux->base);
+ if (err < 0)
+ goto put_backlight;
+
+ return 0;
+
+put_backlight:
+ if (innolux->backlight)
+ put_device(&innolux->backlight->dev);
+
+ return err;
+}
+
+static void innolux_panel_del(struct innolux_panel *innolux)
+{
+ if (innolux->base.dev)
+ drm_panel_remove(&innolux->base);
+
+ if (innolux->backlight)
+ put_device(&innolux->backlight->dev);
+}
+
+static int innolux_panel_probe(struct mipi_dsi_device *dsi)
+{
+ struct innolux_panel *innolux;
+ int err;
+
+ dsi->lanes = 4;
+ dsi->format = MIPI_DSI_FMT_RGB888;
+ dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
+ MIPI_DSI_MODE_LPM;
+
+ innolux = devm_kzalloc(&dsi->dev, sizeof(*innolux), GFP_KERNEL);
+ if (!innolux)
+ return -ENOMEM;
+
+ mipi_dsi_set_drvdata(dsi, innolux);
+
+ innolux->link = dsi;
+
+ err = innolux_panel_add(innolux);
+ if (err < 0)
+ return err;
+
+ err = mipi_dsi_attach(dsi);
+ return err;
+}
+
+static int innolux_panel_remove(struct mipi_dsi_device *dsi)
+{
+ struct innolux_panel *innolux = mipi_dsi_get_drvdata(dsi);
+ int err;
+
+ err = innolux_panel_unprepare(&innolux->base);
+ if (err < 0)
+ DRM_DEV_ERROR(&dsi->dev, "failed to unprepare panel: %d\n",
+ err);
+
+ err = innolux_panel_disable(&innolux->base);
+ if (err < 0)
+ DRM_DEV_ERROR(&dsi->dev, "failed to disable panel: %d\n", err);
+
+ err = mipi_dsi_detach(dsi);
+ if (err < 0)
+ DRM_DEV_ERROR(&dsi->dev, "failed to detach from DSI host: %d\n",
+ err);
+
+ drm_panel_detach(&innolux->base);
+ innolux_panel_del(innolux);
+
+ return 0;
+}
+
+static void innolux_panel_shutdown(struct mipi_dsi_device *dsi)
+{
+ struct innolux_panel *innolux = mipi_dsi_get_drvdata(dsi);
+
+ innolux_panel_unprepare(&innolux->base);
+ innolux_panel_disable(&innolux->base);
+}
+
+static struct mipi_dsi_driver innolux_panel_driver = {
+ .driver = {
+ .name = "panel-innolux-p079zca",
+ .of_match_table = innolux_of_match,
+ },
+ .probe = innolux_panel_probe,
+ .remove = innolux_panel_remove,
+ .shutdown = innolux_panel_shutdown,
+};
+module_mipi_dsi_driver(innolux_panel_driver);
+
+MODULE_AUTHOR("Chris Zhong <[email protected]>");
+MODULE_DESCRIPTION("Innolux P079ZCA panel driver");
+MODULE_LICENSE("GPL v2");
--
2.6.3
On Wed, Mar 15, 2017 at 03:19:12PM +0800, Chris Zhong wrote:
> The Innolux P079ZCA is a 7.85" panel with a 768X1024 resolution and
> connected to DSI using four lanes.
>
> Signed-off-by: Chris Zhong <[email protected]>
> ---
>
> Changes in v2: None
You added documentation for the 'reg' property :)
Looks OK to me.
Reviewed-by: Brian Norris <[email protected]>
>
> .../bindings/display/panel/innolux,p079zca.txt | 23 ++++++++++++++++++++++
> 1 file changed, 23 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/display/panel/innolux,p079zca.txt
>
> diff --git a/Documentation/devicetree/bindings/display/panel/innolux,p079zca.txt b/Documentation/devicetree/bindings/display/panel/innolux,p079zca.txt
> new file mode 100644
> index 0000000..5c70a83
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/innolux,p079zca.txt
> @@ -0,0 +1,23 @@
> +Innolux P079ZCA 7.85" 768x1024 TFT LCD panel
> +
> +Required properties:
> +- compatible: should be "innolux,p079zca"
> +- reg: DSI virtual channel of the peripheral
> +- power-supply: phandle of the regulator that provides the supply voltage
> +- enable-gpios: panel enable gpio
> +
> +Optional properties:
> +- backlight: phandle of the backlight device attached to the panel
> +
> +Example:
> +
> + &mipi_dsi {
> + panel {
> + compatible = "innolux,p079zca";
> + reg = <0>;
> + power-supply = <...>;
> + backlight = <&backlight>;
> + enable-gpios = <&gpio1 13 GPIO_ACTIVE_HIGH>;
> + status = "okay";
> + };
> + };
> --
> 2.6.3
On Wed, Mar 15, 2017 at 03:19:13PM +0800, Chris Zhong wrote:
> Support Innolux P079ZCA 7.85" 768x1024 TFT LCD panel, it is a MIPI DSI
> panel.
>
> Signed-off-by: Chris Zhong <[email protected]>
> ---
>
> Changes in v2:
> - add some error check
> - always use Low power mode to send commend
> - add comments for all the sleep
> - use DRM_DEV_ERROR instead of dev_err
>
> drivers/gpu/drm/panel/Kconfig | 11 +
> drivers/gpu/drm/panel/Makefile | 1 +
> drivers/gpu/drm/panel/panel-innolux-p079zca.c | 344 ++++++++++++++++++++++++++
> 3 files changed, 356 insertions(+)
> create mode 100644 drivers/gpu/drm/panel/panel-innolux-p079zca.c
FWIW:
Tested-by: Brian Norris <[email protected]>
On Wed, Mar 15, 2017 at 03:19:13PM +0800, Chris Zhong wrote:
> Support Innolux P079ZCA 7.85" 768x1024 TFT LCD panel, it is a MIPI DSI
> panel.
>
> Signed-off-by: Chris Zhong <[email protected]>
> ---
>
> Changes in v2:
> - add some error check
> - always use Low power mode to send commend
> - add comments for all the sleep
> - use DRM_DEV_ERROR instead of dev_err
>
Minor suggestion below. Once that's cleared up, you can add:
Reviewed-by: Sean Paul <[email protected]>
Also, please add Thierry directly to your patches so he sees them.
> drivers/gpu/drm/panel/Kconfig | 11 +
> drivers/gpu/drm/panel/Makefile | 1 +
> drivers/gpu/drm/panel/panel-innolux-p079zca.c | 344 ++++++++++++++++++++++++++
> 3 files changed, 356 insertions(+)
> create mode 100644 drivers/gpu/drm/panel/panel-innolux-p079zca.c
>
<snip>
> +static int innolux_panel_prepare(struct drm_panel *panel)
> +{
> + struct innolux_panel *innolux = to_innolux_panel(panel);
> + int err, ret;
> +
> + if (innolux->prepared)
> + return 0;
> +
> + gpiod_set_value_cansleep(innolux->enable_gpio, 0);
> +
> + err = regulator_enable(innolux->supply);
> + if (err < 0)
> + return err;
> +
> + /* T2: 15ms - 1000ms */
> + usleep_range(15000, 16000);
> +
> + gpiod_set_value_cansleep(innolux->enable_gpio, 1);
> +
> + /* T4: 15ms - 1000ms */
> + usleep_range(15000, 16000);
> +
> + err = mipi_dsi_dcs_exit_sleep_mode(innolux->link);
> + if (err < 0) {
> + DRM_DEV_ERROR(panel->dev, "failed to exit sleep mode: %d\n",
> + err);
> + goto poweroff;
> + }
> +
> + /* T6: 120ms - 1000ms*/
> + msleep(120);
> +
> + err = mipi_dsi_dcs_set_display_on(innolux->link);
> + if (err < 0) {
> + DRM_DEV_ERROR(panel->dev, "failed to set display on: %d\n",
> + err);
> + goto poweroff;
> + }
> +
> + /* T7: 5ms */
> + usleep_range(5000, 6000);
> +
> + innolux->prepared = true;
> +
> + return 0;
> +
> +poweroff:
> + ret = regulator_disable(innolux->supply);
> + if (ret)
> + return ret;
I don't think we should be returning this error code. If we're here, it's
because something else triggered err, and we should return that. Change this to:
if (regulator_disable(innolux->supply))
DRM_DEV_ERROR(panel->dev, "failed to disable regulator after error\n");
Sean
> +
> + gpiod_set_value_cansleep(innolux->enable_gpio, 0);
> + return err;
> +}
<snip>
> --
> 2.6.3
>
> _______________________________________________
> dri-devel mailing list
> [email protected]
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
+ Thierry for real
On Tue, Mar 21, 2017 at 03:26:35PM -0400, Sean Paul wrote:
> On Wed, Mar 15, 2017 at 03:19:13PM +0800, Chris Zhong wrote:
> > Support Innolux P079ZCA 7.85" 768x1024 TFT LCD panel, it is a MIPI DSI
> > panel.
> >
> > Signed-off-by: Chris Zhong <[email protected]>
> > ---
> >
> > Changes in v2:
> > - add some error check
> > - always use Low power mode to send commend
> > - add comments for all the sleep
> > - use DRM_DEV_ERROR instead of dev_err
> >
>
> Minor suggestion below. Once that's cleared up, you can add:
> Reviewed-by: Sean Paul <[email protected]>
>
> Also, please add Thierry directly to your patches so he sees them.
>
>
> > drivers/gpu/drm/panel/Kconfig | 11 +
> > drivers/gpu/drm/panel/Makefile | 1 +
> > drivers/gpu/drm/panel/panel-innolux-p079zca.c | 344 ++++++++++++++++++++++++++
> > 3 files changed, 356 insertions(+)
> > create mode 100644 drivers/gpu/drm/panel/panel-innolux-p079zca.c
> >
>
> <snip>
> > +static int innolux_panel_prepare(struct drm_panel *panel)
> > +{
> > + struct innolux_panel *innolux = to_innolux_panel(panel);
> > + int err, ret;
> > +
> > + if (innolux->prepared)
> > + return 0;
> > +
> > + gpiod_set_value_cansleep(innolux->enable_gpio, 0);
> > +
> > + err = regulator_enable(innolux->supply);
> > + if (err < 0)
> > + return err;
> > +
> > + /* T2: 15ms - 1000ms */
> > + usleep_range(15000, 16000);
> > +
> > + gpiod_set_value_cansleep(innolux->enable_gpio, 1);
> > +
> > + /* T4: 15ms - 1000ms */
> > + usleep_range(15000, 16000);
> > +
> > + err = mipi_dsi_dcs_exit_sleep_mode(innolux->link);
> > + if (err < 0) {
> > + DRM_DEV_ERROR(panel->dev, "failed to exit sleep mode: %d\n",
> > + err);
> > + goto poweroff;
> > + }
> > +
> > + /* T6: 120ms - 1000ms*/
> > + msleep(120);
> > +
> > + err = mipi_dsi_dcs_set_display_on(innolux->link);
> > + if (err < 0) {
> > + DRM_DEV_ERROR(panel->dev, "failed to set display on: %d\n",
> > + err);
> > + goto poweroff;
> > + }
> > +
> > + /* T7: 5ms */
> > + usleep_range(5000, 6000);
> > +
> > + innolux->prepared = true;
> > +
> > + return 0;
> > +
> > +poweroff:
> > + ret = regulator_disable(innolux->supply);
> > + if (ret)
> > + return ret;
>
> I don't think we should be returning this error code. If we're here, it's
> because something else triggered err, and we should return that. Change this to:
>
> if (regulator_disable(innolux->supply))
> DRM_DEV_ERROR(panel->dev, "failed to disable regulator after error\n");
And maybe include the error code in that message still?
ret = regulator_disable(innolux->supply);
if (ret)
DRM_DEV_ERROR(panel->dev, "failed to disable regulator after error (%d)\n",
ret);
Brian
> > +
> > + gpiod_set_value_cansleep(innolux->enable_gpio, 0);
> > + return err;
> > +}
>
> <snip>
>
> > --
> > 2.6.3
On Tue, Mar 21, 2017 at 01:38:31PM -0700, Brian Norris wrote:
> + Thierry for real
>
> On Tue, Mar 21, 2017 at 03:26:35PM -0400, Sean Paul wrote:
> > On Wed, Mar 15, 2017 at 03:19:13PM +0800, Chris Zhong wrote:
> > > Support Innolux P079ZCA 7.85" 768x1024 TFT LCD panel, it is a MIPI DSI
> > > panel.
> > >
> > > Signed-off-by: Chris Zhong <[email protected]>
> > > ---
> > >
> > > Changes in v2:
> > > - add some error check
> > > - always use Low power mode to send commend
> > > - add comments for all the sleep
> > > - use DRM_DEV_ERROR instead of dev_err
> > >
> >
> > Minor suggestion below. Once that's cleared up, you can add:
> > Reviewed-by: Sean Paul <[email protected]>
> >
> > Also, please add Thierry directly to your patches so he sees them.
> >
> >
> > > drivers/gpu/drm/panel/Kconfig | 11 +
> > > drivers/gpu/drm/panel/Makefile | 1 +
> > > drivers/gpu/drm/panel/panel-innolux-p079zca.c | 344 ++++++++++++++++++++++++++
> > > 3 files changed, 356 insertions(+)
> > > create mode 100644 drivers/gpu/drm/panel/panel-innolux-p079zca.c
> > >
> >
> > <snip>
> > > +static int innolux_panel_prepare(struct drm_panel *panel)
> > > +{
> > > + struct innolux_panel *innolux = to_innolux_panel(panel);
> > > + int err, ret;
> > > +
> > > + if (innolux->prepared)
> > > + return 0;
> > > +
> > > + gpiod_set_value_cansleep(innolux->enable_gpio, 0);
> > > +
> > > + err = regulator_enable(innolux->supply);
> > > + if (err < 0)
> > > + return err;
> > > +
> > > + /* T2: 15ms - 1000ms */
> > > + usleep_range(15000, 16000);
> > > +
> > > + gpiod_set_value_cansleep(innolux->enable_gpio, 1);
> > > +
> > > + /* T4: 15ms - 1000ms */
> > > + usleep_range(15000, 16000);
> > > +
> > > + err = mipi_dsi_dcs_exit_sleep_mode(innolux->link);
> > > + if (err < 0) {
> > > + DRM_DEV_ERROR(panel->dev, "failed to exit sleep mode: %d\n",
> > > + err);
> > > + goto poweroff;
> > > + }
> > > +
> > > + /* T6: 120ms - 1000ms*/
> > > + msleep(120);
> > > +
> > > + err = mipi_dsi_dcs_set_display_on(innolux->link);
> > > + if (err < 0) {
> > > + DRM_DEV_ERROR(panel->dev, "failed to set display on: %d\n",
> > > + err);
> > > + goto poweroff;
> > > + }
> > > +
> > > + /* T7: 5ms */
> > > + usleep_range(5000, 6000);
> > > +
> > > + innolux->prepared = true;
> > > +
> > > + return 0;
> > > +
> > > +poweroff:
> > > + ret = regulator_disable(innolux->supply);
> > > + if (ret)
> > > + return ret;
> >
> > I don't think we should be returning this error code. If we're here, it's
> > because something else triggered err, and we should return that. Change this to:
> >
> > if (regulator_disable(innolux->supply))
> > DRM_DEV_ERROR(panel->dev, "failed to disable regulator after error\n");
>
> And maybe include the error code in that message still?
>
> ret = regulator_disable(innolux->supply);
> if (ret)
> DRM_DEV_ERROR(panel->dev, "failed to disable regulator after error (%d)\n",
> ret);
Sure, but let's not have ret beside err, each function should have one or the
other. So, perhaps s/ret/regulator_err/ or similar.
Sean
>
> Brian
>
> > > +
> > > + gpiod_set_value_cansleep(innolux->enable_gpio, 0);
> > > + return err;
> > > +}
> >
> > <snip>
> >
> > > --
> > > 2.6.3
--
Sean Paul, Software Engineer, Google / Chromium OS