drm/modes: Allow DRM_MODE_ROTATE_0 when applying video mode parameters

[ Upstream commit 5c320b6ce7510653bce68cecf80cf5b2d67e907f ]

At the moment, only DRM_MODE_ROTATE_180 is allowed when we try to apply
the rotation from the video mode parameters. It is also useful to allow
DRM_MODE_ROTATE_0 in case there is only a reflect option in the video mode
parameter (e.g. video=540x960,reflect_x).

DRM_MODE_ROTATE_0 means "no rotation" and should therefore not require
any special handling, so we can just add it to the if condition.

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20200117153429.54700-3-stephan@gerhold.net
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/drm_client_modeset.c b/drivers/gpu/drm/drm_client_modeset.c
index 12e748b..18cb88b 100644 (file)
--- a/drivers/gpu/drm/drm_client_modeset.c
+++ b/drivers/gpu/drm/drm_client_modeset.c
@@ -952,7 +952,8 @@ bool drm_client_rotation(struct drm_mode_set *modeset, unsigned int *rotation)
         * depending on the hardware this may require the framebuffer
         * to be in a specific tiling format.
         */
-       if ((*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_180 ||
+       if (((*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_0 &&
+            (*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_180) ||
            !plane->rotation_property)
                return false;