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drm/vram: Support scanline alignment for dumb buffers

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Adding the pitch alignment as an argument to
drm_gem_vram_fill_create_dumb() allows to align scanlines to certain
offsets. A value of 0 disables scanline pitches.

v3:
	* only do power-of-2 test if pitch_align given; fails otherwise
	* mgag200: call drm_gem_vram_fill_create_dumb() with pitch_align
v2:
	* split of patch from related hibmc changes
	* test if scanline pitch is power of 2

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191203083819.6643-4-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann
2019-12-03 09:38:17 +01:00
parent 3e10d2ffd2
commit 9870732786
3 changed files with 12 additions and 4 deletions
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1
include/drm/drm_gem_vram_helper.h
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@@ -112,6 +112,7 @@ int drm_gem_vram_fill_create_dumb(struct drm_file *file,
struct drm_device *dev,
struct ttm_bo_device *bdev,
unsigned long pg_align,
unsigned long pitch_align,
bool interruptible,
struct drm_mode_create_dumb *args);