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
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@ -90,6 +90,18 @@ static irqreturn_t meson_irq(int irq, void *arg)
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return IRQ_HANDLED;
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}
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static int meson_dumb_create(struct drm_file *file, struct drm_device *dev,
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struct drm_mode_create_dumb *args)
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{
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/*
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* We need 64bytes aligned stride, and PAGE aligned size
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*/
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args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8), SZ_64);
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args->size = PAGE_ALIGN(args->pitch * args->height);
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return drm_gem_cma_dumb_create_internal(file, dev, args);
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}
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DEFINE_DRM_GEM_CMA_FOPS(fops);
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static struct drm_driver meson_driver = {
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@ -112,7 +124,7 @@ static struct drm_driver meson_driver = {
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.gem_prime_mmap = drm_gem_cma_prime_mmap,
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/* GEM Ops */
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.dumb_create = drm_gem_cma_dumb_create,
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.dumb_create = meson_dumb_create,
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.gem_free_object_unlocked = drm_gem_cma_free_object,
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.gem_vm_ops = &drm_gem_cma_vm_ops,
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