Commit 21f815bf authored by Philippe Cornu's avatar Philippe Cornu Committed by Benjamin Gaignard
Browse files

drm/stm: drv: Improve data transfers 



To optimize data transfers, align pitch on 128 bytes & height
on 4 bytes. This optimization is not applicable on hw without MMU.

Signed-off-by: default avatarYannick Fertre <yannick.fertre@st.com>
Signed-off-by: default avatarVincent Abriou <vincent.abriou@st.com>
Signed-off-by: default avatarPhilippe Cornu <philippe.cornu@st.com>
Signed-off-by: default avatarBenjamin Gaignard <benjamin.gaignard@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180130104200.21602-1-philippe.cornu@st.com
parent 023f3489

drivers/gpu/drm/stm/drv.c

+19 −1
Original line number Diff line number Diff line
@@ -31,6 +31,24 @@ static const struct drm_mode_config_funcs drv_mode_config_funcs = { 
	.atomic_commit = drm_atomic_helper_commit,

};



static int stm_gem_cma_dumb_create(struct drm_file *file,

				   struct drm_device *dev,

				   struct drm_mode_create_dumb *args)

{

#ifdef CONFIG_MMU

	unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);



	/*

	 * in order to optimize data transfer, pitch is aligned on

	 * 128 bytes, height is aligned on 4 bytes

	 */

	args->pitch = roundup(min_pitch, 128);

	args->height = roundup(args->height, 4);

#endif



	return drm_gem_cma_dumb_create_internal(file, dev, args);

}



DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops);



static struct drm_driver drv_driver = {
@@ -44,7 +62,7 @@ static struct drm_driver drv_driver = { 
	.minor = 0,

	.patchlevel = 0,

	.fops = &drv_driver_fops,

	.dumb_create = drm_gem_cma_dumb_create,

	.dumb_create = stm_gem_cma_dumb_create,

	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,

	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,

	.gem_free_object_unlocked = drm_gem_cma_free_object,

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