From: Kevin Tang <[email protected]>
Adds drm support for the Unisoc's display subsystem.
This is drm kms driver, this driver provides support for the
application framework in Android, Yocto and more.
Application framework can access Unisoc's display internel
peripherals through libdrm or libkms, it's test ok by modetest
(DRM/KMS test tool) and Android HWComposer.
Cc: Orson Zhai <[email protected]>
Cc: Chunyan Zhang <[email protected]>
Signed-off-by: Kevin Tang <[email protected]>
---
drivers/gpu/drm/Kconfig | 2 +
drivers/gpu/drm/Makefile | 1 +
drivers/gpu/drm/sprd/Kconfig | 12 +++
drivers/gpu/drm/sprd/Makefile | 5 +
drivers/gpu/drm/sprd/sprd_drm.c | 226 ++++++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/sprd/sprd_drm.h | 16 +++
6 files changed, 262 insertions(+)
create mode 100644 drivers/gpu/drm/sprd/Kconfig
create mode 100644 drivers/gpu/drm/sprd/Makefile
create mode 100644 drivers/gpu/drm/sprd/sprd_drm.c
create mode 100644 drivers/gpu/drm/sprd/sprd_drm.h
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index c4fd57d..7fe7ab91 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -386,6 +386,8 @@ source "drivers/gpu/drm/mcde/Kconfig"
source "drivers/gpu/drm/tidss/Kconfig"
+source "drivers/gpu/drm/sprd/Kconfig"
+
# Keep legacy drivers last
menuconfig DRM_LEGACY
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 2c0e5a7..ee2ccd9 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -123,3 +123,4 @@ obj-$(CONFIG_DRM_PANFROST) += panfrost/
obj-$(CONFIG_DRM_ASPEED_GFX) += aspeed/
obj-$(CONFIG_DRM_MCDE) += mcde/
obj-$(CONFIG_DRM_TIDSS) += tidss/
+obj-$(CONFIG_DRM_SPRD) += sprd/
diff --git a/drivers/gpu/drm/sprd/Kconfig b/drivers/gpu/drm/sprd/Kconfig
new file mode 100644
index 0000000..b189a54
--- /dev/null
+++ b/drivers/gpu/drm/sprd/Kconfig
@@ -0,0 +1,12 @@
+config DRM_SPRD
+ tristate "DRM Support for Unisoc SoCs Platform"
+ depends on ARCH_SPRD || COMPILE_TEST
+ depends on DRM && OF
+ select DRM_KMS_HELPER
+ select DRM_GEM_CMA_HELPER
+ select DRM_KMS_CMA_HELPER
+ select DRM_MIPI_DSI
+ help
+ Choose this option if you have a Unisoc chipsets.
+ If M is selected the module will be called sprd-drm.
+
diff --git a/drivers/gpu/drm/sprd/Makefile b/drivers/gpu/drm/sprd/Makefile
new file mode 100644
index 0000000..86d95d9
--- /dev/null
+++ b/drivers/gpu/drm/sprd/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+
+subdir-ccflags-y += -I$(srctree)/$(src)
+
+obj-y := sprd_drm.o
diff --git a/drivers/gpu/drm/sprd/sprd_drm.c b/drivers/gpu/drm/sprd/sprd_drm.c
new file mode 100644
index 0000000..4706185
--- /dev/null
+++ b/drivers/gpu/drm/sprd/sprd_drm.c
@@ -0,0 +1,226 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 Unisoc Inc.
+ */
+
+#include <linux/component.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of_graph.h>
+#include <linux/of_platform.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_of.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_vblank.h>
+
+#include "sprd_drm.h"
+
+#define DRIVER_NAME "sprd"
+#define DRIVER_DESC "Spreadtrum SoCs' DRM Driver"
+#define DRIVER_DATE "20200201"
+#define DRIVER_MAJOR 1
+#define DRIVER_MINOR 0
+
+static const struct drm_mode_config_helper_funcs sprd_drm_mode_config_helper = {
+ .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
+};
+
+static const struct drm_mode_config_funcs sprd_drm_mode_config_funcs = {
+ .fb_create = drm_gem_fb_create,
+ .atomic_check = drm_atomic_helper_check,
+ .atomic_commit = drm_atomic_helper_commit,
+};
+
+static void sprd_drm_mode_config_init(struct drm_device *drm)
+{
+ drm_mode_config_init(drm);
+
+ drm->mode_config.min_width = 0;
+ drm->mode_config.min_height = 0;
+ drm->mode_config.max_width = 8192;
+ drm->mode_config.max_height = 8192;
+ drm->mode_config.allow_fb_modifiers = true;
+
+ drm->mode_config.funcs = &sprd_drm_mode_config_funcs;
+ drm->mode_config.helper_private = &sprd_drm_mode_config_helper;
+}
+
+DEFINE_DRM_GEM_CMA_FOPS(sprd_drm_fops);
+
+static struct drm_driver sprd_drm_drv = {
+ .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+ .fops = &sprd_drm_fops,
+
+ /* GEM Operations */
+ DRM_GEM_CMA_VMAP_DRIVER_OPS,
+
+ .name = DRIVER_NAME,
+ .desc = DRIVER_DESC,
+ .date = DRIVER_DATE,
+ .major = DRIVER_MAJOR,
+ .minor = DRIVER_MINOR,
+};
+
+static int sprd_drm_bind(struct device *dev)
+{
+ struct drm_device *drm;
+ struct sprd_drm *sprd;
+ int err;
+
+ drm = drm_dev_alloc(&sprd_drm_drv, dev);
+ if (IS_ERR(drm))
+ return PTR_ERR(drm);
+
+ dev_set_drvdata(dev, drm);
+
+ sprd = devm_kzalloc(drm->dev, sizeof(*sprd), GFP_KERNEL);
+ if (!sprd)
+ err = -ENOMEM;
+
+ drm->dev_private = sprd;
+
+ sprd_drm_mode_config_init(drm);
+
+ /* bind and init sub drivers */
+ err = component_bind_all(drm->dev, drm);
+ if (err) {
+ DRM_ERROR("failed to bind all component.\n");
+ goto err_dc_cleanup;
+ }
+
+ /* vblank init */
+ err = drm_vblank_init(drm, drm->mode_config.num_crtc);
+ if (err) {
+ DRM_ERROR("failed to initialize vblank.\n");
+ goto err_unbind_all;
+ }
+ /* with irq_enabled = true, we can use the vblank feature. */
+ drm->irq_enabled = true;
+
+ /* reset all the states of crtc/plane/encoder/connector */
+ drm_mode_config_reset(drm);
+
+ /* init kms poll for handling hpd */
+ drm_kms_helper_poll_init(drm);
+
+ err = drm_dev_register(drm, 0);
+ if (err < 0)
+ goto err_kms_helper_poll_fini;
+
+ return 0;
+
+err_kms_helper_poll_fini:
+ drm_kms_helper_poll_fini(drm);
+err_unbind_all:
+ component_unbind_all(drm->dev, drm);
+err_dc_cleanup:
+ drm_mode_config_cleanup(drm);
+ return err;
+}
+
+static void sprd_drm_unbind(struct device *dev)
+{
+ struct drm_device *drm = dev_get_drvdata(dev);
+
+ drm_dev_unregister(drm);
+
+ drm_kms_helper_poll_fini(drm);
+
+ drm_mode_config_cleanup(drm);
+
+ component_unbind_all(drm->dev, drm);
+ drm->dev_private = NULL;
+ dev_set_drvdata(dev, NULL);
+
+ drm_dev_put(drm);
+}
+
+static const struct component_master_ops drm_component_ops = {
+ .bind = sprd_drm_bind,
+ .unbind = sprd_drm_unbind,
+};
+
+static int compare_of(struct device *dev, void *data)
+{
+ return dev->of_node == data;
+}
+
+static int sprd_drm_probe(struct platform_device *pdev)
+{
+ int ret;
+
+ ret = dma_set_mask_and_coherent(&pdev->dev, ~0);
+ if (ret) {
+ DRM_ERROR("dma_set_mask_and_coherent failed (%d)\n", ret);
+ return ret;
+ }
+
+ return drm_of_component_probe(&pdev->dev, compare_of, &drm_component_ops);
+}
+
+static int sprd_drm_remove(struct platform_device *pdev)
+{
+ component_master_del(&pdev->dev, &drm_component_ops);
+ return 0;
+}
+
+static void sprd_drm_shutdown(struct platform_device *pdev)
+{
+ struct drm_device *drm = platform_get_drvdata(pdev);
+
+ if (!drm) {
+ DRM_WARN("drm device is not available, no shutdown\n");
+ return;
+ }
+
+ drm_atomic_helper_shutdown(drm);
+}
+
+static const struct of_device_id drm_match_table[] = {
+ { .compatible = "sprd,display-subsystem", },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, drm_match_table);
+
+static struct platform_driver sprd_drm_driver = {
+ .probe = sprd_drm_probe,
+ .remove = sprd_drm_remove,
+ .shutdown = sprd_drm_shutdown,
+ .driver = {
+ .name = "sprd-drm-drv",
+ .of_match_table = drm_match_table,
+ },
+};
+
+static struct platform_driver *sprd_drm_drivers[] = {
+ &sprd_drm_driver,
+};
+
+static int __init sprd_drm_init(void)
+{
+ int ret;
+
+ ret = platform_register_drivers(sprd_drm_drivers,
+ ARRAY_SIZE(sprd_drm_drivers));
+ return ret;
+}
+
+static void __exit sprd_drm_exit(void)
+{
+ platform_unregister_drivers(sprd_drm_drivers,
+ ARRAY_SIZE(sprd_drm_drivers));
+}
+
+module_init(sprd_drm_init);
+module_exit(sprd_drm_exit);
+
+MODULE_AUTHOR("Leon He <[email protected]>");
+MODULE_AUTHOR("Kevin Tang <[email protected]>");
+MODULE_DESCRIPTION("Unisoc DRM KMS Master Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/gpu/drm/sprd/sprd_drm.h b/drivers/gpu/drm/sprd/sprd_drm.h
new file mode 100644
index 0000000..edf0881
--- /dev/null
+++ b/drivers/gpu/drm/sprd/sprd_drm.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020 Unisoc Inc.
+ */
+
+#ifndef _SPRD_DRM_H_
+#define _SPRD_DRM_H_
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_print.h>
+
+struct sprd_drm {
+ struct drm_device *drm;
+};
+
+#endif /* _SPRD_DRM_H_ */
--
2.7.4
On 7/28/20 3:07 AM, Kevin Tang wrote:
> diff --git a/drivers/gpu/drm/sprd/Kconfig b/drivers/gpu/drm/sprd/Kconfig
> new file mode 100644
> index 0000000..b189a54
> --- /dev/null
> +++ b/drivers/gpu/drm/sprd/Kconfig
> @@ -0,0 +1,12 @@
> +config DRM_SPRD
> + tristate "DRM Support for Unisoc SoCs Platform"
> + depends on ARCH_SPRD || COMPILE_TEST
> + depends on DRM && OF
> + select DRM_KMS_HELPER
> + select DRM_GEM_CMA_HELPER
> + select DRM_KMS_CMA_HELPER
> + select DRM_MIPI_DSI
> + help
> + Choose this option if you have a Unisoc chipsets.
chipset.
> + If M is selected the module will be called sprd-drm.
sprd_drm.
> +
> diff --git a/drivers/gpu/drm/sprd/Makefile b/drivers/gpu/drm/sprd/Makefile
> new file mode 100644
> index 0000000..86d95d9
> --- /dev/null
> +++ b/drivers/gpu/drm/sprd/Makefile
> @@ -0,0 +1,5 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +subdir-ccflags-y += -I$(srctree)/$(src)
> +
> +obj-y := sprd_drm.o
--
~Randy
Hi Kevin.
Nice split of the driver.
Some feedback in the following.
Most to bring the driver up-to-date with what have happened since
we saw it last time.
Keeping up with the changes in drm is not always easy.
Sam
On Tue, Jul 28, 2020 at 06:07:55PM +0800, Kevin Tang wrote:
> From: Kevin Tang <[email protected]>
>
> Adds drm support for the Unisoc's display subsystem.
>
> This is drm kms driver, this driver provides support for the
> application framework in Android, Yocto and more.
>
> Application framework can access Unisoc's display internel
> peripherals through libdrm or libkms, it's test ok by modetest
> (DRM/KMS test tool) and Android HWComposer.
>
> Cc: Orson Zhai <[email protected]>
> Cc: Chunyan Zhang <[email protected]>
> Signed-off-by: Kevin Tang <[email protected]>
> ---
> drivers/gpu/drm/Kconfig | 2 +
> drivers/gpu/drm/Makefile | 1 +
> drivers/gpu/drm/sprd/Kconfig | 12 +++
> drivers/gpu/drm/sprd/Makefile | 5 +
> drivers/gpu/drm/sprd/sprd_drm.c | 226 ++++++++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/sprd/sprd_drm.h | 16 +++
> 6 files changed, 262 insertions(+)
> create mode 100644 drivers/gpu/drm/sprd/Kconfig
> create mode 100644 drivers/gpu/drm/sprd/Makefile
> create mode 100644 drivers/gpu/drm/sprd/sprd_drm.c
> create mode 100644 drivers/gpu/drm/sprd/sprd_drm.h
>
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index c4fd57d..7fe7ab91 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -386,6 +386,8 @@ source "drivers/gpu/drm/mcde/Kconfig"
>
> source "drivers/gpu/drm/tidss/Kconfig"
>
> +source "drivers/gpu/drm/sprd/Kconfig"
> +
> # Keep legacy drivers last
>
> menuconfig DRM_LEGACY
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index 2c0e5a7..ee2ccd9 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -123,3 +123,4 @@ obj-$(CONFIG_DRM_PANFROST) += panfrost/
> obj-$(CONFIG_DRM_ASPEED_GFX) += aspeed/
> obj-$(CONFIG_DRM_MCDE) += mcde/
> obj-$(CONFIG_DRM_TIDSS) += tidss/
> +obj-$(CONFIG_DRM_SPRD) += sprd/
> diff --git a/drivers/gpu/drm/sprd/Kconfig b/drivers/gpu/drm/sprd/Kconfig
> new file mode 100644
> index 0000000..b189a54
> --- /dev/null
> +++ b/drivers/gpu/drm/sprd/Kconfig
> @@ -0,0 +1,12 @@
> +config DRM_SPRD
> + tristate "DRM Support for Unisoc SoCs Platform"
> + depends on ARCH_SPRD || COMPILE_TEST
> + depends on DRM && OF
> + select DRM_KMS_HELPER
> + select DRM_GEM_CMA_HELPER
> + select DRM_KMS_CMA_HELPER
> + select DRM_MIPI_DSI
> + help
> + Choose this option if you have a Unisoc chipsets.
> + If M is selected the module will be called sprd-drm.
> +
> diff --git a/drivers/gpu/drm/sprd/Makefile b/drivers/gpu/drm/sprd/Makefile
> new file mode 100644
> index 0000000..86d95d9
> --- /dev/null
> +++ b/drivers/gpu/drm/sprd/Makefile
> @@ -0,0 +1,5 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +subdir-ccflags-y += -I$(srctree)/$(src)
subdir-ccflags-y is not needed - drop it.
> +
> +obj-y := sprd_drm.o
> diff --git a/drivers/gpu/drm/sprd/sprd_drm.c b/drivers/gpu/drm/sprd/sprd_drm.c
> new file mode 100644
> index 0000000..4706185
> --- /dev/null
> +++ b/drivers/gpu/drm/sprd/sprd_drm.c
> @@ -0,0 +1,226 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2020 Unisoc Inc.
> + */
> +
> +#include <linux/component.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of_graph.h>
> +#include <linux/of_platform.h>
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_drv.h>
> +#include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_gem_framebuffer_helper.h>
> +#include <drm/drm_of.h>
> +#include <drm/drm_probe_helper.h>
> +#include <drm/drm_vblank.h>
> +
> +#include "sprd_drm.h"
> +
> +#define DRIVER_NAME "sprd"
> +#define DRIVER_DESC "Spreadtrum SoCs' DRM Driver"
> +#define DRIVER_DATE "20200201"
> +#define DRIVER_MAJOR 1
> +#define DRIVER_MINOR 0
> +
> +static const struct drm_mode_config_helper_funcs sprd_drm_mode_config_helper = {
> + .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
> +};
> +
> +static const struct drm_mode_config_funcs sprd_drm_mode_config_funcs = {
> + .fb_create = drm_gem_fb_create,
> + .atomic_check = drm_atomic_helper_check,
> + .atomic_commit = drm_atomic_helper_commit,
> +};
> +
> +static void sprd_drm_mode_config_init(struct drm_device *drm)
> +{
> + drm_mode_config_init(drm);
The documentation of this functions says:
FIXME: This function is deprecated and drivers should be converted over to
drmm_mode_config_init().
> +
> + drm->mode_config.min_width = 0;
> + drm->mode_config.min_height = 0;
> + drm->mode_config.max_width = 8192;
> + drm->mode_config.max_height = 8192;
> + drm->mode_config.allow_fb_modifiers = true;
> +
> + drm->mode_config.funcs = &sprd_drm_mode_config_funcs;
> + drm->mode_config.helper_private = &sprd_drm_mode_config_helper;
> +}
> +
> +DEFINE_DRM_GEM_CMA_FOPS(sprd_drm_fops);
> +
> +static struct drm_driver sprd_drm_drv = {
> + .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
> + .fops = &sprd_drm_fops,
> +
> + /* GEM Operations */
> + DRM_GEM_CMA_VMAP_DRIVER_OPS,
> +
> + .name = DRIVER_NAME,
> + .desc = DRIVER_DESC,
> + .date = DRIVER_DATE,
> + .major = DRIVER_MAJOR,
> + .minor = DRIVER_MINOR,
> +};
> +
> +static int sprd_drm_bind(struct device *dev)
> +{
> + struct drm_device *drm;
> + struct sprd_drm *sprd;
> + int err;
> +
> + drm = drm_dev_alloc(&sprd_drm_drv, dev);
> + if (IS_ERR(drm))
> + return PTR_ERR(drm);
> +
> + dev_set_drvdata(dev, drm);
> +
> + sprd = devm_kzalloc(drm->dev, sizeof(*sprd), GFP_KERNEL);
> + if (!sprd)
> + err = -ENOMEM;
Embed drm_device in sprd_drm and use devm_drm_dev_alloc
See other drivers and drm_drv.c how to do it.
drm_drv.c has a nice example explained in one of the comment blocks.
> +
> + drm->dev_private = sprd;
dev_private is deprecated. Alwyas use upclassing.
> +
> + sprd_drm_mode_config_init(drm);
> +
> + /* bind and init sub drivers */
> + err = component_bind_all(drm->dev, drm);
> + if (err) {
> + DRM_ERROR("failed to bind all component.\n");
> + goto err_dc_cleanup;
> + }
> +
> + /* vblank init */
> + err = drm_vblank_init(drm, drm->mode_config.num_crtc);
> + if (err) {
> + DRM_ERROR("failed to initialize vblank.\n");
> + goto err_unbind_all;
> + }
> + /* with irq_enabled = true, we can use the vblank feature. */
> + drm->irq_enabled = true;
Can drm_irq_install() be used?
Then this flag shall not be set by the driver.
> +
> + /* reset all the states of crtc/plane/encoder/connector */
> + drm_mode_config_reset(drm);
> +
> + /* init kms poll for handling hpd */
> + drm_kms_helper_poll_init(drm);
> +
> + err = drm_dev_register(drm, 0);
> + if (err < 0)
> + goto err_kms_helper_poll_fini;
> +
> + return 0;
> +
> +err_kms_helper_poll_fini:
> + drm_kms_helper_poll_fini(drm);
> +err_unbind_all:
> + component_unbind_all(drm->dev, drm);
> +err_dc_cleanup:
> + drm_mode_config_cleanup(drm);
> + return err;
> +}
> +
> +static void sprd_drm_unbind(struct device *dev)
> +{
> + struct drm_device *drm = dev_get_drvdata(dev);
> +
> + drm_dev_unregister(drm);
> +
> + drm_kms_helper_poll_fini(drm);
> +
> + drm_mode_config_cleanup(drm);
> +
> + component_unbind_all(drm->dev, drm);
> + drm->dev_private = NULL;
> + dev_set_drvdata(dev, NULL);
> +
> + drm_dev_put(drm);
> +}
> +
> +static const struct component_master_ops drm_component_ops = {
> + .bind = sprd_drm_bind,
> + .unbind = sprd_drm_unbind,
> +};
> +
> +static int compare_of(struct device *dev, void *data)
> +{
> + return dev->of_node == data;
> +}
> +
> +static int sprd_drm_probe(struct platform_device *pdev)
> +{
> + int ret;
> +
> + ret = dma_set_mask_and_coherent(&pdev->dev, ~0);
> + if (ret) {
> + DRM_ERROR("dma_set_mask_and_coherent failed (%d)\n", ret);
> + return ret;
> + }
> +
> + return drm_of_component_probe(&pdev->dev, compare_of, &drm_component_ops);
> +}
> +
> +static int sprd_drm_remove(struct platform_device *pdev)
> +{
> + component_master_del(&pdev->dev, &drm_component_ops);
> + return 0;
> +}
> +
> +static void sprd_drm_shutdown(struct platform_device *pdev)
> +{
> + struct drm_device *drm = platform_get_drvdata(pdev);
> +
> + if (!drm) {
> + DRM_WARN("drm device is not available, no shutdown\n");
> + return;
> + }
> +
> + drm_atomic_helper_shutdown(drm);
> +}
> +
> +static const struct of_device_id drm_match_table[] = {
> + { .compatible = "sprd,display-subsystem", },
> + { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, drm_match_table);
> +
> +static struct platform_driver sprd_drm_driver = {
> + .probe = sprd_drm_probe,
> + .remove = sprd_drm_remove,
> + .shutdown = sprd_drm_shutdown,
> + .driver = {
> + .name = "sprd-drm-drv",
> + .of_match_table = drm_match_table,
> + },
> +};
> +
> +static struct platform_driver *sprd_drm_drivers[] = {
> + &sprd_drm_driver,
> +};
> +
> +static int __init sprd_drm_init(void)
> +{
> + int ret;
> +
> + ret = platform_register_drivers(sprd_drm_drivers,
> + ARRAY_SIZE(sprd_drm_drivers));
> + return ret;
> +}
> +
> +static void __exit sprd_drm_exit(void)
> +{
> + platform_unregister_drivers(sprd_drm_drivers,
> + ARRAY_SIZE(sprd_drm_drivers));
> +}
> +
> +module_init(sprd_drm_init);
> +module_exit(sprd_drm_exit);
> +
> +MODULE_AUTHOR("Leon He <[email protected]>");
> +MODULE_AUTHOR("Kevin Tang <[email protected]>");
> +MODULE_DESCRIPTION("Unisoc DRM KMS Master Driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/gpu/drm/sprd/sprd_drm.h b/drivers/gpu/drm/sprd/sprd_drm.h
> new file mode 100644
> index 0000000..edf0881
> --- /dev/null
> +++ b/drivers/gpu/drm/sprd/sprd_drm.h
> @@ -0,0 +1,16 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020 Unisoc Inc.
> + */
> +
> +#ifndef _SPRD_DRM_H_
> +#define _SPRD_DRM_H_
> +
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_print.h>
> +
> +struct sprd_drm {
> + struct drm_device *drm;
> +};
> +
> +#endif /* _SPRD_DRM_H_ */
> --
> 2.7.4
>
> _______________________________________________
> dri-devel mailing list
> [email protected]
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
Sam Ravnborg <[email protected]> 于2020年7月29日周三 上午4:45写道：
>
> Hi Kevin.
>
> Nice split of the driver.
> Some feedback in the following.
> Most to bring the driver up-to-date with what have happened since
> we saw it last time.
> Keeping up with the changes in drm is not always easy.
>
> Sam
>
Hi Sam,
Thanks for your feedback,
I am really busy sometimes, but will try my best to keep up with others.
>
> On Tue, Jul 28, 2020 at 06:07:55PM +0800, Kevin Tang wrote:
> > From: Kevin Tang <[email protected]>
> >
> > Adds drm support for the Unisoc's display subsystem.
> >
> > This is drm kms driver, this driver provides support for the
> > application framework in Android, Yocto and more.
> >
> > Application framework can access Unisoc's display internel
> > peripherals through libdrm or libkms, it's test ok by modetest
> > (DRM/KMS test tool) and Android HWComposer.
> >
> > Cc: Orson Zhai <[email protected]>
> > Cc: Chunyan Zhang <[email protected]>
> > Signed-off-by: Kevin Tang <[email protected]>
> > ---
> > drivers/gpu/drm/Kconfig | 2 +
> > drivers/gpu/drm/Makefile | 1 +
> > drivers/gpu/drm/sprd/Kconfig | 12 +++
> > drivers/gpu/drm/sprd/Makefile | 5 +
> > drivers/gpu/drm/sprd/sprd_drm.c | 226 ++++++++++++++++++++++++++++++++++++++++
> > drivers/gpu/drm/sprd/sprd_drm.h | 16 +++
> > 6 files changed, 262 insertions(+)
> > create mode 100644 drivers/gpu/drm/sprd/Kconfig
> > create mode 100644 drivers/gpu/drm/sprd/Makefile
> > create mode 100644 drivers/gpu/drm/sprd/sprd_drm.c
> > create mode 100644 drivers/gpu/drm/sprd/sprd_drm.h
> >
> > diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> > index c4fd57d..7fe7ab91 100644
> > --- a/drivers/gpu/drm/Kconfig
> > +++ b/drivers/gpu/drm/Kconfig
> > @@ -386,6 +386,8 @@ source "drivers/gpu/drm/mcde/Kconfig"
> >
> > source "drivers/gpu/drm/tidss/Kconfig"
> >
> > +source "drivers/gpu/drm/sprd/Kconfig"
> > +
> > # Keep legacy drivers last
> >
> > menuconfig DRM_LEGACY
> > diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> > index 2c0e5a7..ee2ccd9 100644
> > --- a/drivers/gpu/drm/Makefile
> > +++ b/drivers/gpu/drm/Makefile
> > @@ -123,3 +123,4 @@ obj-$(CONFIG_DRM_PANFROST) += panfrost/
> > obj-$(CONFIG_DRM_ASPEED_GFX) += aspeed/
> > obj-$(CONFIG_DRM_MCDE) += mcde/
> > obj-$(CONFIG_DRM_TIDSS) += tidss/
> > +obj-$(CONFIG_DRM_SPRD) += sprd/
> > diff --git a/drivers/gpu/drm/sprd/Kconfig b/drivers/gpu/drm/sprd/Kconfig
> > new file mode 100644
> > index 0000000..b189a54
> > --- /dev/null
> > +++ b/drivers/gpu/drm/sprd/Kconfig
> > @@ -0,0 +1,12 @@
> > +config DRM_SPRD
> > + tristate "DRM Support for Unisoc SoCs Platform"
> > + depends on ARCH_SPRD || COMPILE_TEST
> > + depends on DRM && OF
> > + select DRM_KMS_HELPER
> > + select DRM_GEM_CMA_HELPER
> > + select DRM_KMS_CMA_HELPER
> > + select DRM_MIPI_DSI
> > + help
> > + Choose this option if you have a Unisoc chipsets.
> > + If M is selected the module will be called sprd-drm.
> > +
> > diff --git a/drivers/gpu/drm/sprd/Makefile b/drivers/gpu/drm/sprd/Makefile
> > new file mode 100644
> > index 0000000..86d95d9
> > --- /dev/null
> > +++ b/drivers/gpu/drm/sprd/Makefile
> > @@ -0,0 +1,5 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +
> > +subdir-ccflags-y += -I$(srctree)/$(src)
> subdir-ccflags-y is not needed - drop it.
>
> > +
> > +obj-y := sprd_drm.o
> > diff --git a/drivers/gpu/drm/sprd/sprd_drm.c b/drivers/gpu/drm/sprd/sprd_drm.c
> > new file mode 100644
> > index 0000000..4706185
> > --- /dev/null
> > +++ b/drivers/gpu/drm/sprd/sprd_drm.c
> > @@ -0,0 +1,226 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2020 Unisoc Inc.
> > + */
> > +
> > +#include <linux/component.h>
> > +#include <linux/dma-mapping.h>
> > +#include <linux/module.h>
> > +#include <linux/mutex.h>
> > +#include <linux/of_graph.h>
> > +#include <linux/of_platform.h>
> > +
> > +#include <drm/drm_atomic_helper.h>
> > +#include <drm/drm_crtc_helper.h>
> > +#include <drm/drm_drv.h>
> > +#include <drm/drm_gem_cma_helper.h>
> > +#include <drm/drm_gem_framebuffer_helper.h>
> > +#include <drm/drm_of.h>
> > +#include <drm/drm_probe_helper.h>
> > +#include <drm/drm_vblank.h>
> > +
> > +#include "sprd_drm.h"
> > +
> > +#define DRIVER_NAME "sprd"
> > +#define DRIVER_DESC "Spreadtrum SoCs' DRM Driver"
> > +#define DRIVER_DATE "20200201"
> > +#define DRIVER_MAJOR 1
> > +#define DRIVER_MINOR 0
> > +
> > +static const struct drm_mode_config_helper_funcs sprd_drm_mode_config_helper = {
> > + .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
> > +};
> > +
> > +static const struct drm_mode_config_funcs sprd_drm_mode_config_funcs = {
> > + .fb_create = drm_gem_fb_create,
> > + .atomic_check = drm_atomic_helper_check,
> > + .atomic_commit = drm_atomic_helper_commit,
> > +};
> > +
> > +static void sprd_drm_mode_config_init(struct drm_device *drm)
> > +{
> > + drm_mode_config_init(drm);
> The documentation of this functions says:
>
> FIXME: This function is deprecated and drivers should be converted over to
> drmm_mode_config_init().
>
>
> > +
> > + drm->mode_config.min_width = 0;
> > + drm->mode_config.min_height = 0;
> > + drm->mode_config.max_width = 8192;
> > + drm->mode_config.max_height = 8192;
> > + drm->mode_config.allow_fb_modifiers = true;
> > +
> > + drm->mode_config.funcs = &sprd_drm_mode_config_funcs;
> > + drm->mode_config.helper_private = &sprd_drm_mode_config_helper;
> > +}
> > +
> > +DEFINE_DRM_GEM_CMA_FOPS(sprd_drm_fops);
> > +
> > +static struct drm_driver sprd_drm_drv = {
> > + .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
> > + .fops = &sprd_drm_fops,
> > +
> > + /* GEM Operations */
> > + DRM_GEM_CMA_VMAP_DRIVER_OPS,
> > +
> > + .name = DRIVER_NAME,
> > + .desc = DRIVER_DESC,
> > + .date = DRIVER_DATE,
> > + .major = DRIVER_MAJOR,
> > + .minor = DRIVER_MINOR,
> > +};
> > +
> > +static int sprd_drm_bind(struct device *dev)
> > +{
> > + struct drm_device *drm;
> > + struct sprd_drm *sprd;
> > + int err;
> > +
> > + drm = drm_dev_alloc(&sprd_drm_drv, dev);
> > + if (IS_ERR(drm))
> > + return PTR_ERR(drm);
> > +
> > + dev_set_drvdata(dev, drm);
> > +
> > + sprd = devm_kzalloc(drm->dev, sizeof(*sprd), GFP_KERNEL);
> > + if (!sprd)
> > + err = -ENOMEM;
>
> Embed drm_device in sprd_drm and use devm_drm_dev_alloc
> See other drivers and drm_drv.c how to do it.
> drm_drv.c has a nice example explained in one of the comment blocks.
>
> > +
> > + drm->dev_private = sprd;
> dev_private is deprecated. Alwyas use upclassing.
dev_private is deprecated ? I see everyone is still using it, so it
will be deprecated in the future?
>
> > +
> > + sprd_drm_mode_config_init(drm);
> > +
> > + /* bind and init sub drivers */
> > + err = component_bind_all(drm->dev, drm);
> > + if (err) {
> > + DRM_ERROR("failed to bind all component.\n");
> > + goto err_dc_cleanup;
> > + }
> > +
> > + /* vblank init */
> > + err = drm_vblank_init(drm, drm->mode_config.num_crtc);
> > + if (err) {
> > + DRM_ERROR("failed to initialize vblank.\n");
> > + goto err_unbind_all;
> > + }
> > + /* with irq_enabled = true, we can use the vblank feature. */
> > + drm->irq_enabled = true;
> Can drm_irq_install() be used?
> Then this flag shall not be set by the driver, And the interrupt numbers on different Soc are not necessarily the same
>
We need to set "IRQ_NOAUTOEN" flag for CRTC IRQ, you can see that we
manually turn the interrupt on and off by crtc
atomic_enable/atomic_disable
and the interrupt number on different Soc are not necessarily the
same. So intall interrupt in kms maybe is not suitable for us...
> > +
> > + /* reset all the states of crtc/plane/encoder/connector */
> > + drm_mode_config_reset(drm);
> > +
> > + /* init kms poll for handling hpd */
> > + drm_kms_helper_poll_init(drm);
> > +
> > + err = drm_dev_register(drm, 0);
> > + if (err < 0)
> > + goto err_kms_helper_poll_fini;
> > +
> > + return 0;
> > +
> > +err_kms_helper_poll_fini:
> > + drm_kms_helper_poll_fini(drm);
> > +err_unbind_all:
> > + component_unbind_all(drm->dev, drm);
> > +err_dc_cleanup:
> > + drm_mode_config_cleanup(drm);
> > + return err;
> > +}
> > +
> > +static void sprd_drm_unbind(struct device *dev)
> > +{
> > + struct drm_device *drm = dev_get_drvdata(dev);
> > +
> > + drm_dev_unregister(drm);
> > +
> > + drm_kms_helper_poll_fini(drm);
> > +
> > + drm_mode_config_cleanup(drm);
> > +
> > + component_unbind_all(drm->dev, drm);
> > + drm->dev_private = NULL;
> > + dev_set_drvdata(dev, NULL);
> > +
> > + drm_dev_put(drm);
> > +}
> > +
> > +static const struct component_master_ops drm_component_ops = {
> > + .bind = sprd_drm_bind,
> > + .unbind = sprd_drm_unbind,
> > +};
> > +
> > +static int compare_of(struct device *dev, void *data)
> > +{
> > + return dev->of_node == data;
> > +}
> > +
> > +static int sprd_drm_probe(struct platform_device *pdev)
> > +{
> > + int ret;
> > +
> > + ret = dma_set_mask_and_coherent(&pdev->dev, ~0);
> > + if (ret) {
> > + DRM_ERROR("dma_set_mask_and_coherent failed (%d)\n", ret);
> > + return ret;
> > + }
> > +
> > + return drm_of_component_probe(&pdev->dev, compare_of, &drm_component_ops);
> > +}
> > +
> > +static int sprd_drm_remove(struct platform_device *pdev)
> > +{
> > + component_master_del(&pdev->dev, &drm_component_ops);
> > + return 0;
> > +}
> > +
> > +static void sprd_drm_shutdown(struct platform_device *pdev)
> > +{
> > + struct drm_device *drm = platform_get_drvdata(pdev);
> > +
> > + if (!drm) {
> > + DRM_WARN("drm device is not available, no shutdown\n");
> > + return;
> > + }
> > +
> > + drm_atomic_helper_shutdown(drm);
> > +}
> > +
> > +static const struct of_device_id drm_match_table[] = {
> > + { .compatible = "sprd,display-subsystem", },
> > + { /* sentinel */ },
> > +};
> > +MODULE_DEVICE_TABLE(of, drm_match_table);
> > +
> > +static struct platform_driver sprd_drm_driver = {
> > + .probe = sprd_drm_probe,
> > + .remove = sprd_drm_remove,
> > + .shutdown = sprd_drm_shutdown,
> > + .driver = {
> > + .name = "sprd-drm-drv",
> > + .of_match_table = drm_match_table,
> > + },
> > +};
> > +
> > +static struct platform_driver *sprd_drm_drivers[] = {
> > + &sprd_drm_driver,
> > +};
> > +
> > +static int __init sprd_drm_init(void)
> > +{
> > + int ret;
> > +
> > + ret = platform_register_drivers(sprd_drm_drivers,
> > + ARRAY_SIZE(sprd_drm_drivers));
> > + return ret;
> > +}
> > +
> > +static void __exit sprd_drm_exit(void)
> > +{
> > + platform_unregister_drivers(sprd_drm_drivers,
> > + ARRAY_SIZE(sprd_drm_drivers));
> > +}
> > +
> > +module_init(sprd_drm_init);
> > +module_exit(sprd_drm_exit);
> > +
> > +MODULE_AUTHOR("Leon He <[email protected]>");
> > +MODULE_AUTHOR("Kevin Tang <[email protected]>");
> > +MODULE_DESCRIPTION("Unisoc DRM KMS Master Driver");
> > +MODULE_LICENSE("GPL v2");
> > diff --git a/drivers/gpu/drm/sprd/sprd_drm.h b/drivers/gpu/drm/sprd/sprd_drm.h
> > new file mode 100644
> > index 0000000..edf0881
> > --- /dev/null
> > +++ b/drivers/gpu/drm/sprd/sprd_drm.h
> > @@ -0,0 +1,16 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020 Unisoc Inc.
> > + */
> > +
> > +#ifndef _SPRD_DRM_H_
> > +#define _SPRD_DRM_H_
> > +
> > +#include <drm/drm_atomic.h>
> > +#include <drm/drm_print.h>
> > +
> > +struct sprd_drm {
> > + struct drm_device *drm;
> > +};
> > +
> > +#endif /* _SPRD_DRM_H_ */
> > --
> > 2.7.4
> >
> > _______________________________________________
> > dri-devel mailing list
> > [email protected]
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
Hi Kevin
> >
> > > +
> > > + drm->dev_private = sprd;
> > dev_private is deprecated. Alwyas use upclassing.
> dev_private is deprecated ? I see everyone is still using it, so it
> will be deprecated in the future?
It is deprecated - and a lot of drivers is in need up an update to get
away from using it.
From the kernel-doc:
/**
* @dev_private:
*
* DRM driver private data. This is deprecated and should be left set to
* NULL.
*
* Instead of using this pointer it is recommended that drivers use
* drm_dev_init() and embed struct &drm_device in their larger
* per-device structure.
*/
void *dev_private;
> > > + }
> > > + /* with irq_enabled = true, we can use the vblank feature. */
> > > + drm->irq_enabled = true;
> > Can drm_irq_install() be used?
> > Then this flag shall not be set by the driver, And the interrupt numbers on different Soc are not necessarily the same
> >
> We need to set "IRQ_NOAUTOEN" flag for CRTC IRQ, you can see that we
> manually turn the interrupt on and off by crtc
> atomic_enable/atomic_disable
> and the interrupt number on different Soc are not necessarily the
> same. So intall interrupt in kms maybe is not suitable for us...
Maybe drm_irq_install() does not fit the need here. But please take an
extra look as what is does is quite basic. And no need to roll your
own if there is available infrstructure that can be used.
But there is nothing wrong rolloing your own if needed.
Sam