drm/gem-dma: revert the 8-byte alignment constraint

Using drm_mode_size_dumb() to compute the size of dumb buffers introduced
an 8-byte alignment constraint on the pitch that wasn’t present before.
Let’s remove this constraint, which isn’t necessarily required and may
cause buffers to be allocated larger than needed.

Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: dcacfcd35cef ("drm/gem-dma: Compute dumb-buffer sizes with drm_mode_size_dumb()")
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patch.msgid.link/20251126-lcd_pitch_alignment-v1-1-991610a1e369@microchip.com

diff --git a/drivers/gpu/drm/drm_gem_dma_helper.c b/drivers/gpu/drm/drm_gem_dma_helper.c
index 12d8307997a0a90a9b5c0469bd742130fa6722d5..eb56ba2347966040a3c7fd27e09c8b81bc797daa 100644 (file)
--- a/drivers/gpu/drm/drm_gem_dma_helper.c
+++ b/drivers/gpu/drm/drm_gem_dma_helper.c
@@ -308,7 +308,7 @@ int drm_gem_dma_dumb_create(struct drm_file *file_priv,
        struct drm_gem_dma_object *dma_obj;
        int ret;
 
-       ret = drm_mode_size_dumb(drm, args, SZ_8, 0);
+       ret = drm_mode_size_dumb(drm, args, 0, 0);
        if (ret)
                return ret;