[Intel-gfx] [PATCH] drm/i915: Fix SKL+ 90/270 degree rotated plane coordinate computation

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Pass the framebuffer size in .16 fixed point coordinates to
drm_rect_rotate() since that's what the source coordinates are as well
at this stage. We used to do this part of the computation in integer
coordinates, but that got changed when moving the computation to
happen in the check phase of the operation. Unfortunately I forgot
to shift up the fb width and height appropriately.

With the bogus size we ended up with some negative fb offset, which when
added to the vma offset caused out scanout to start at an offset earlier
than we inteded. Eg. when testing on my SKL I saw a row of incorrect
tiles at the top of my screen.

Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Sivakumar Thulasimani <sivakumar.thulasimani at intel.com>
Cc: drm-intel-fixes at lists.freedesktop.org
Fixes: b63a16f6cd89 ("drm/i915: Compute display surface offset in the plane check hook for SKL+")
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 5a036999487b..c783f884f85d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2985,7 +2985,8 @@ int skl_check_plane_surface(struct intel_plane_state *plane_state)
 	/* Rotate src coordinates to match rotated GTT view */
 	if (drm_rotation_90_or_270(rotation))
 		drm_rect_rotate(&plane_state->base.src,
-				fb->width, fb->height, DRM_ROTATE_270);
+				fb->width << 16, fb->height << 16,
+				DRM_ROTATE_270);
 
 	/*
 	 * Handle the AUX surface first since
-- 
2.7.4