[PATCH 20/25] drm/exynos: gem: set default alignment for dumb GEM buffers

[Marek Szyprowski]

This patch forces all GEM buffers to have pitch aligned at least to 8
pixels. This is a common requirement for various Exynos IPP blocks,
which otherwise won't be able to operate on buffers of random size.

Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_drv.h | 2 ++
 drivers/gpu/drm/exynos/exynos_drm_gem.c | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h
index 9ed52b04c0ba..0890e6709f10 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
@@ -24,6 +24,8 @@
 
 #define DEFAULT_WIN	0
 
+#define EXYNOS_DRM_PITCH_ALIGN	8
+
 #define EXYNOS_BAD_PIXEL_FORMAT 0xffffffffu
 
 #define to_exynos_crtc(x)	container_of(x, struct exynos_drm_crtc, base)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index 252eb301470c..b5db6e6cc043 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -417,7 +417,7 @@ int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
 	 *	with DRM_IOCTL_MODE_CREATE_DUMB command.
 	 */
 
-	args->pitch = args->width * ((args->bpp + 7) / 8);
+	args->pitch = roundup(args->width, EXYNOS_DRM_PITCH_ALIGN) * ((args->bpp + 7) / 8);
 	args->size = args->pitch * args->height;
 
 	if (is_drm_iommu_supported(dev))
-- 
1.9.2