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Commit b759012c authored by Yannick Fertre's avatar Yannick Fertre Committed by Eric Anholt
Browse files

drm/stm: Add STM32 LTDC driver 



This controller provides output signals to interface directly a variety
of LCD and TFT panels. These output signals are: RGB signals
(up to 24bpp), vertical & horizontal synchronisations, data enable and
the pixel clock.

Reviewed-by: default avatarEric Anholt <eric@anholt.net>
Signed-off-by: default avatarYannick Fertre <yannick.fertre@st.com>
Signed-off-by: default avatarEric Anholt <eric@anholt.net>
Link: http://patchwork.freedesktop.org/patch/msgid/1492164819-10513-5-git-send-email-yannick.fertre@st.com


Reviewed-by: default avatarNeil Armstrong <narmstrong@baylibre.com>
Reviewed-by: default avatarEric Anholt <eric@anholt.net>
parent 7121926d

drivers/gpu/drm/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -246,6 +246,8 @@ source "drivers/gpu/drm/fsl-dcu/Kconfig" 


source "drivers/gpu/drm/tegra/Kconfig"



source "drivers/gpu/drm/stm/Kconfig"



source "drivers/gpu/drm/panel/Kconfig"



source "drivers/gpu/drm/bridge/Kconfig"

drivers/gpu/drm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -82,6 +82,7 @@ obj-$(CONFIG_DRM_BOCHS) += bochs/ 
obj-$(CONFIG_DRM_VIRTIO_GPU) += virtio/

obj-$(CONFIG_DRM_MSM) += msm/

obj-$(CONFIG_DRM_TEGRA) += tegra/

obj-$(CONFIG_DRM_STM) += stm/

obj-$(CONFIG_DRM_STI) += sti/

obj-$(CONFIG_DRM_IMX) += imx/

obj-$(CONFIG_DRM_MEDIATEK) += mediatek/

drivers/gpu/drm/stm/Kconfig

0 → 100644
+16 −0
Original line number Diff line number Diff line 
config DRM_STM

	tristate "DRM Support for STMicroelectronics SoC Series"

	depends on DRM && (ARCH_STM32 || ARCH_MULTIPLATFORM)

	select DRM_KMS_HELPER

	select DRM_GEM_CMA_HELPER

	select DRM_KMS_CMA_HELPER

	select DRM_PANEL

	select VIDEOMODE_HELPERS

	select FB_PROVIDE_GET_FB_UNMAPPED_AREA

	default y



	help

	  Enable support for the on-chip display controller on

	  STMicroelectronics STM32 MCUs.

	  To compile this driver as a module, choose M here: the module

	  will be called stm-drm.

drivers/gpu/drm/stm/Makefile

0 → 100644
+7 −0
Original line number Diff line number Diff line 
ccflags-y := -Iinclude/drm



stm-drm-y := \

	drv.o \

	ltdc.o



obj-$(CONFIG_DRM_STM) += stm-drm.o

drivers/gpu/drm/stm/drv.c

0 → 100644
+221 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) STMicroelectronics SA 2017

 *

 * Authors: Philippe Cornu <philippe.cornu@st.com>

 *          Yannick Fertre <yannick.fertre@st.com>

 *          Fabien Dessenne <fabien.dessenne@st.com>

 *          Mickael Reulier <mickael.reulier@st.com>

 *

 * License terms:  GNU General Public License (GPL), version 2

 */



#include <linux/component.h>

#include <linux/of_platform.h>



#include <drm/drm_atomic.h>

#include <drm/drm_atomic_helper.h>

#include <drm/drm_crtc_helper.h>

#include <drm/drm_fb_cma_helper.h>

#include <drm/drm_gem_cma_helper.h>



#include "ltdc.h"



#define DRIVER_NAME		"stm"

#define DRIVER_DESC		"STMicroelectronics SoC DRM"

#define DRIVER_DATE		"20170330"

#define DRIVER_MAJOR		1

#define DRIVER_MINOR		0

#define DRIVER_PATCH_LEVEL	0



#define STM_MAX_FB_WIDTH	2048

#define STM_MAX_FB_HEIGHT	2048 /* same as width to handle orientation */



static void drv_output_poll_changed(struct drm_device *ddev)

{

	struct ltdc_device *ldev = ddev->dev_private;



	drm_fbdev_cma_hotplug_event(ldev->fbdev);

}



static const struct drm_mode_config_funcs drv_mode_config_funcs = {

	.fb_create = drm_fb_cma_create,

	.output_poll_changed = drv_output_poll_changed,

	.atomic_check = drm_atomic_helper_check,

	.atomic_commit = drm_atomic_helper_commit,

};



static void drv_lastclose(struct drm_device *ddev)

{

	struct ltdc_device *ldev = ddev->dev_private;



	DRM_DEBUG("%s\n", __func__);



	drm_fbdev_cma_restore_mode(ldev->fbdev);

}



DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops);



static struct drm_driver drv_driver = {

	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |

			   DRIVER_ATOMIC,

	.lastclose = drv_lastclose,

	.name = DRIVER_NAME,

	.desc = DRIVER_DESC,

	.date = DRIVER_DATE,

	.major = DRIVER_MAJOR,

	.minor = DRIVER_MINOR,

	.patchlevel = DRIVER_PATCH_LEVEL,

	.fops = &drv_driver_fops,

	.dumb_create = drm_gem_cma_dumb_create,

	.dumb_map_offset = drm_gem_cma_dumb_map_offset,

	.dumb_destroy = drm_gem_dumb_destroy,

	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,

	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,

	.gem_free_object_unlocked = drm_gem_cma_free_object,

	.gem_vm_ops = &drm_gem_cma_vm_ops,

	.gem_prime_export = drm_gem_prime_export,

	.gem_prime_import = drm_gem_prime_import,

	.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,

	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,

	.gem_prime_vmap = drm_gem_cma_prime_vmap,

	.gem_prime_vunmap = drm_gem_cma_prime_vunmap,

	.gem_prime_mmap = drm_gem_cma_prime_mmap,

	.enable_vblank = ltdc_crtc_enable_vblank,

	.disable_vblank = ltdc_crtc_disable_vblank,

};



static int drv_load(struct drm_device *ddev)

{

	struct platform_device *pdev = to_platform_device(ddev->dev);

	struct drm_fbdev_cma *fbdev;

	struct ltdc_device *ldev;

	int ret;



	DRM_DEBUG("%s\n", __func__);



	ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL);

	if (!ldev)

		return -ENOMEM;



	ddev->dev_private = (void *)ldev;



	drm_mode_config_init(ddev);



	/*

	 * set max width and height as default value.

	 * this value would be used to check framebuffer size limitation

	 * at drm_mode_addfb().

	 */

	ddev->mode_config.min_width = 0;

	ddev->mode_config.min_height = 0;

	ddev->mode_config.max_width = STM_MAX_FB_WIDTH;

	ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;

	ddev->mode_config.funcs = &drv_mode_config_funcs;



	ret = ltdc_load(ddev);

	if (ret)

		goto err;



	drm_mode_config_reset(ddev);

	drm_kms_helper_poll_init(ddev);



	if (ddev->mode_config.num_connector) {

		ldev = ddev->dev_private;

		fbdev = drm_fbdev_cma_init(ddev, 16,

					   ddev->mode_config.num_connector);

		if (IS_ERR(fbdev)) {

			DRM_DEBUG("Warning: fails to create fbdev\n");

			fbdev = NULL;

		}

		ldev->fbdev = fbdev;

	}



	platform_set_drvdata(pdev, ddev);



	return 0;

err:

	drm_mode_config_cleanup(ddev);

	return ret;

}



static void drv_unload(struct drm_device *ddev)

{

	struct ltdc_device *ldev = ddev->dev_private;



	DRM_DEBUG("%s\n", __func__);



	if (ldev->fbdev) {

		drm_fbdev_cma_fini(ldev->fbdev);

		ldev->fbdev = NULL;

	}

	drm_kms_helper_poll_fini(ddev);

	ltdc_unload(ddev);

	drm_mode_config_cleanup(ddev);

}



static int stm_drm_platform_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct drm_device *ddev;

	int ret;



	DRM_DEBUG("%s\n", __func__);



	dma_set_coherent_mask(dev, DMA_BIT_MASK(32));



	ddev = drm_dev_alloc(&drv_driver, dev);

	if (IS_ERR(ddev))

		return PTR_ERR(ddev);



	ret = drv_load(ddev);

	if (ret)

		goto err_unref;



	ret = drm_dev_register(ddev, 0);

	if (ret)

		goto err_unref;



	return 0;



err_unref:

	drm_dev_unref(ddev);



	return ret;

}



static int stm_drm_platform_remove(struct platform_device *pdev)

{

	struct drm_device *ddev = platform_get_drvdata(pdev);



	DRM_DEBUG("%s\n", __func__);



	drm_dev_unregister(ddev);

	drv_unload(ddev);

	drm_dev_unref(ddev);



	return 0;

}



static const struct of_device_id drv_dt_ids[] = {

	{ .compatible = "st,stm32-ltdc"},

	{ /* end node */ },

};

MODULE_DEVICE_TABLE(of, drv_dt_ids);



static struct platform_driver stm_drm_platform_driver = {

	.probe = stm_drm_platform_probe,

	.remove = stm_drm_platform_remove,

	.driver = {

		.name = DRIVER_NAME,

		.of_match_table = drv_dt_ids,

	},

};



module_platform_driver(stm_drm_platform_driver);



MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");

MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");

MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");

MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");

MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");

MODULE_LICENSE("GPL v2");