[PATCH] drm/stm: drv: Improve data transfers

[Philippe Cornu]

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

Signed-off-by: Yannick Fertre <yannick.fertre@xxxxxx>
Signed-off-by: Vincent Abriou <vincent.abriou@xxxxxx>
Signed-off-by: Philippe Cornu <philippe.cornu@xxxxxx>
---
 drivers/gpu/drm/stm/drv.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/stm/drv.c b/drivers/gpu/drm/stm/drv.c
index 8fe954c27fba..c2bd9d882b93 100644
--- a/drivers/gpu/drm/stm/drv.c
+++ b/drivers/gpu/drm/stm/drv.c
@@ -31,6 +31,23 @@ static const struct drm_mode_config_funcs drv_mode_config_funcs = {
 	.atomic_commit = drm_atomic_helper_commit,
 };
 
+#ifdef CONFIG_MMU
+static int stm_dumb_create(struct drm_file *file, struct drm_device *dev,
+			   struct drm_mode_create_dumb *args)
+{
+	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);
+
+	return drm_gem_cma_dumb_create_internal(file, dev, args);
+}
+#endif
+
 DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops);
 
 static struct drm_driver drv_driver = {
@@ -44,7 +61,11 @@ static struct drm_driver drv_driver = {
 	.minor = 0,
 	.patchlevel = 0,
 	.fops = &drv_driver_fops,
+#ifdef CONFIG_MMU
+	.dumb_create = stm_dumb_create,
+#else
 	.dumb_create = drm_gem_cma_dumb_create,
+#endif
 	.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,
-- 
2.15.1