[PATCH 5.5 025/189] drm/modes: Allow DRM_MODE_ROTATE_0 when applying video mode parameters

From: Greg Kroah-Hartman
Date: Tue Mar 10 2020 - 09:25:59 EST


From: Stephan Gerhold <stephan@xxxxxxxxxxx>

[ 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@xxxxxxxxxxx>
Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20200117153429.54700-3-stephan@xxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/gpu/drm/drm_client_modeset.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_client_modeset.c b/drivers/gpu/drm/drm_client_modeset.c
index 6d4a29e99ae26..3035584f6dc72 100644
--- a/drivers/gpu/drm/drm_client_modeset.c
+++ b/drivers/gpu/drm/drm_client_modeset.c
@@ -951,7 +951,8 @@ 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;

--
2.20.1