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drm/tegra: Properly align stride for framebuffers

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Tegra20 and Tegra30 both required the buffer line stride to be aligned
on 8 byte boundaries. Tegra114 and Tegra124 increased the alignment to
64 bytes. Introduce a parameter to specify the alignment requirements
for each display controller and round up the pitch of newly allocated
framebuffers appropriately.

Originally-by: Stéphane Marchesin <marcheu@chromium.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding
2014-07-11 08:29:14 +02:00
parent 3f4f3b5fed
commit d1f3e1e0b3
4 changed files with 27 additions and 1 deletions
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3
drivers/gpu/drm/tegra/gem.c
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@@ -16,6 +16,7 @@
#include <linux/dma-buf.h>
#include <drm/tegra_drm.h>
#include "drm.h"
#include "gem.h"
static inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo)
@@ -259,8 +260,10 @@ int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
struct drm_mode_create_dumb *args)
{
int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
struct tegra_drm *tegra = drm->dev_private;
struct tegra_bo *bo;
min_pitch = round_up(min_pitch, tegra->pitch_align);
if (args->pitch < min_pitch)
args->pitch = min_pitch;