[PATCH v4 5/9] drm/exynos: Add generic support for devices shared with V4L2 subsystem

[Marek Szyprowski]

Some hardware modules, like FIMC in Exynos4 series are shared between
V4L2 (camera support) and DRM (memory-to-memory processing) subsystems.
This patch provides a simple check to let such drivers to be used in the
driver components framework.

Signed-off-by: Marek Szyprowski <m.szyprow...@samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_drv.c | 17 ++++++++++++++++-
 drivers/gpu/drm/exynos/exynos_drm_drv.h |  2 ++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c 
b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index cac0d84385d3..60ae6ae06eb2 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -216,6 +216,7 @@ struct exynos_drm_driver_info {
 #define DRM_COMPONENT_DRIVER   BIT(0)  /* supports component framework */
 #define DRM_VIRTUAL_DEVICE     BIT(1)  /* create virtual platform device */
 #define DRM_DMA_DEVICE         BIT(2)  /* can be used for dma allocations */
+#define DRM_SHARED_DEVICE      BIT(3)  /* devices shared with V4L2 subsystem */
 
 #define DRV_PTR(drv, cond) (IS_ENABLED(cond) ? &drv : NULL)
 
@@ -267,6 +268,17 @@ static struct exynos_drm_driver_info exynos_drm_drivers[] 
= {
        }
 };
 
+int exynos_drm_check_shared_device(struct device *dev)
+{
+       /*
+        * Exynos DRM drivers handle only devices that support
+        * the LCD Writeback data path, rest is handled by V4L2 driver
+        */
+       if (!of_property_read_bool(dev->of_node, "samsung,lcd-wb"))
+               return -ENODEV;
+       return 0;
+}
+
 static int compare_dev(struct device *dev, void *data)
 {
        return dev == (struct device *)data;
@@ -288,7 +300,10 @@ static struct component_match *exynos_drm_match_add(struct 
device *dev)
                                            &info->driver->driver,
                                            (void *)platform_bus_type.match))) {
                        put_device(p);
-                       component_match_add(dev, &match, compare_dev, d);
+
+                       if (!(info->flags & DRM_SHARED_DEVICE) ||
+                           exynos_drm_check_shared_device(d) == 0)
+                               component_match_add(dev, &match, compare_dev, 
d);
                        p = d;
                }
                put_device(p);
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h 
b/drivers/gpu/drm/exynos/exynos_drm_drv.h
index b47f810d64d2..8b3b31d35168 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
@@ -275,6 +275,8 @@ static inline int exynos_dpi_bind(struct drm_device *dev,
 }
 #endif
 
+int exynos_drm_check_shared_device(struct device *dev);
+
 int exynos_atomic_commit(struct drm_device *dev, struct drm_atomic_state 
*state,
                         bool nonblock);
 int exynos_atomic_check(struct drm_device *dev, struct drm_atomic_state 
*state);
-- 
2.14.2

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