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drm/meson: add size and alignment requirements for dumb buffers 

The Amlogic SoCs Canvas buffers stride must be aligned on 64bytes
and overall size should be aligned on PAGE width.

Adds a custom dumb_create op to adds these requirements.

Fixes: bbbe775ec5 ("drm: Add support for Amlogic Meson Graphic Controller")
Suggested-by: Sky Zhou <sky.zhou@amlogic.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Sky Zhou <sky.zhou@amlogic.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190408090137.2402-1-narmstrong@baylibre.com
This commit is contained in:
Neil Armstrong 2019-04-08 11:01:37 +02:00
parent 2ccb8433eb
commit 852ce7285c
1 changed files with 13 additions and 1 deletions
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14
drivers/gpu/drm/meson/meson_drv.c
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@ -90,6 +90,18 @@ static irqreturn_t meson_irq(int irq, void *arg)
return IRQ_HANDLED;
}
static int meson_dumb_create(struct drm_file *file, struct drm_device *dev,
struct drm_mode_create_dumb *args)
{
/*
* We need 64bytes aligned stride, and PAGE aligned size
*/
args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8), SZ_64);
args->size = PAGE_ALIGN(args->pitch * args->height);
return drm_gem_cma_dumb_create_internal(file, dev, args);
}
DEFINE_DRM_GEM_CMA_FOPS(fops);
static struct drm_driver meson_driver = {
@ -112,7 +124,7 @@ static struct drm_driver meson_driver = {
.gem_prime_mmap = drm_gem_cma_prime_mmap,
/* GEM Ops */
.dumb_create = drm_gem_cma_dumb_create,
.dumb_create = meson_dumb_create,
.gem_free_object_unlocked = drm_gem_cma_free_object,
.gem_vm_ops = &drm_gem_cma_vm_ops,