Mali DP hardware needs pitch line sizes aligned to the bus burst size for reads, so take that into consideration when allocating dumb buffers. If the layer is rotated then the stride size requirement is even larger for some hardware versions, so allocate for the worst case scenario. Update the ->dumb_create() hook to a driver specific function that sets the correct pitch size.

Reported-by: Ayan Halder ayan.halder@arm.com Signed-off-by: Liviu Dudau liviu.dudau@arm.com --- drivers/gpu/drm/arm/malidp_drv.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c index 3d82712d8002..d88a3b9d59cc 100644 --- a/drivers/gpu/drm/arm/malidp_drv.c +++ b/drivers/gpu/drm/arm/malidp_drv.c @@ -312,13 +312,26 @@ static int malidp_irq_init(struct platform_device *pdev)

DEFINE_DRM_GEM_CMA_FOPS(fops);

+static int malidp_dumb_create(struct drm_file *file_priv, + struct drm_device *drm, + struct drm_mode_create_dumb *args) +{ + struct malidp_drm *malidp = drm->dev_private; + /* allocate for the worst case scenario, i.e. rotated buffers */ + u8 alignment = malidp_hw_get_pitch_align(malidp->dev, 1); + + args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8), alignment); + + return drm_gem_cma_dumb_create_internal(file_priv, drm, args); +} + static struct drm_driver malidp_driver = { .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_PRIME, .lastclose = drm_fb_helper_lastclose, .gem_free_object_unlocked = drm_gem_cma_free_object, .gem_vm_ops = &drm_gem_cma_vm_ops, - .dumb_create = drm_gem_cma_dumb_create, + .dumb_create = malidp_dumb_create, .prime_handle_to_fd = drm_gem_prime_handle_to_fd, .prime_fd_to_handle = drm_gem_prime_fd_to_handle, .gem_prime_export = drm_gem_prime_export,