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

Call drm_mode_size_dumb() to compute dumb-buffer scanline pitch and
buffer size. No alignment required.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Alim Akhtar <alim.akhtar@samsung.com>
Acked-by: Inki Dae <inki.dae@samsung.com>
Link: https://lore.kernel.org/r/20250821081918.79786-8-tzimmermann@suse.de

diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index e3fbb45f37a27bb1dd92082fc727dd812e0eabdf..02714c9ab63941683310ba415e778accb2575987 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -10,6 +10,7 @@
 #include <linux/shmem_fs.h>
 #include <linux/module.h>
 
+#include <drm/drm_dumb_buffers.h>
 #include <drm/drm_prime.h>
 #include <drm/drm_vma_manager.h>
 #include <drm/exynos_drm.h>
@@ -329,15 +330,16 @@ int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
        unsigned int flags;
        int ret;
 
+       ret = drm_mode_size_dumb(dev, args, 0, 0);
+       if (ret)
+               return ret;
+
        /*
         * allocate memory to be used for framebuffer.
         * - this callback would be called by user application
         *      with DRM_IOCTL_MODE_CREATE_DUMB command.
         */
 
-       args->pitch = args->width * ((args->bpp + 7) / 8);
-       args->size = args->pitch * args->height;
-
        if (is_drm_iommu_supported(dev))
                flags = EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC;
        else