drm/tegra: Compute dumb-buffer sizes with drm_mode_size_dumb()

Call drm_mode_size_dumb() to compute dumb-buffer scanline pitch and
buffer size. Align the pitch according to hardware requirements.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Thierry Reding <treding@nvidia.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Mikko Perttunen <mperttunen@nvidia.com>
Link: https://lore.kernel.org/r/20250821081918.79786-21-tzimmermann@suse.de

diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index 8ede07fb7a21d66bb896d537cc73b0cb84cfe4f3..6b14f1e919eb6b2e614a43f1aaa1ecc8ff6e06a5 100644 (file)
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -16,6 +16,7 @@
 #include <linux/vmalloc.h>
 
 #include <drm/drm_drv.h>
+#include <drm/drm_dumb_buffers.h>
 #include <drm/drm_prime.h>
 
 #include "drm.h"
@@ -542,12 +543,13 @@ void tegra_bo_free_object(struct drm_gem_object *gem)
 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
                         struct drm_mode_create_dumb *args)
 {
-       unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
        struct tegra_drm *tegra = drm->dev_private;
        struct tegra_bo *bo;
+       int ret;
 
-       args->pitch = round_up(min_pitch, tegra->pitch_align);
-       args->size = args->pitch * args->height;
+       ret = drm_mode_size_dumb(drm, args, tegra->pitch_align, 0);
+       if (ret)
+               return ret;
 
        bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
                                         &args->handle);