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

diff --git a/drivers/gpu/drm/stm/drv.c b/drivers/gpu/drm/stm/drv.c
index 8fe954c27fbacdfb5858a2cac1a11cb719e185c4..8bc7e8418b8d7c4cbe8b422259700fb52809c5fc 100644 (file)
--- a/drivers/gpu/drm/stm/drv.c
+++ b/drivers/gpu/drm/stm/drv.c
@@ -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,