drm/omap: fix plane check when crtc is disabled

I sometimes see:

[drm:drm_framebuffer_remove [drm]] *ERROR* failed to reset crtc ed2a6c00
when fb was deleted: -22

which comes from drm_framebuffer_remove() when it's disabling the crtc
with zeroed drm_mode_set.

The problem in omap_plane_atomic_check() is that it will use those
zeroed fields to verify if the setup is correct.

This patch makes omap_plane_atomic_check() return 0 if the crtc is
disabled.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/omapdrm/omap_plane.c b/drivers/gpu/drm/omapdrm/omap_plane.c
index 0ffd5b930ec0..7bd24185f33c 100644
--- a/drivers/gpu/drm/omapdrm/omap_plane.c
+++ b/drivers/gpu/drm/omapdrm/omap_plane.c
@@ -164,6 +164,9 @@ static int omap_plane_atomic_check(struct drm_plane *plane,
         if (IS_ERR(crtc_state))
                 return PTR_ERR(crtc_state);
 
+        if (!crtc_state->enable)
+                return 0;
+
         if (state->crtc_x < 0 || state->crtc_y < 0)
                 return -EINVAL;