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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: Yannick Fertre <yannick.fertre@st.com>
Signed-off-by: Vincent Abriou <vincent.abriou@st.com>
Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180130104200.21602-1-philippe.cornu@st.com
This commit is contained in:
Philippe Cornu 2018-01-30 11:42:00 +01:00 committed by Benjamin Gaignard
parent 023f348901
commit 21f815bf77
1 changed files with 19 additions and 1 deletions
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20
drivers/gpu/drm/stm/drv.c
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@ -31,6 +31,24 @@ static const struct drm_mode_config_funcs drv_mode_config_funcs = {
.atomic_commit = drm_atomic_helper_commit, .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); DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops);
static struct drm_driver drv_driver = { static struct drm_driver drv_driver = {
@ -44,7 +62,7 @@ static struct drm_driver drv_driver = {
.minor = 0, .minor = 0,
.patchlevel = 0, .patchlevel = 0,
.fops = &drv_driver_fops, .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_handle_to_fd = drm_gem_prime_handle_to_fd,
.prime_fd_to_handle = drm_gem_prime_fd_to_handle, .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
.gem_free_object_unlocked = drm_gem_cma_free_object, .gem_free_object_unlocked = drm_gem_cma_free_object,