drm/i915: Fix 90/270 rotated coordinates for FBC

The clipped src coordinates have already been rotated by 270 degrees for
when the plane rotation is 90/270 degrees, hence the FBC code should no
longer swap the width and height.

Cc: stable@vger.kernel.org
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Fixes: b63a16f6cd89 ("drm/i915: Compute display surface offset in the plane check hook for SKL+")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170331180056.14086-4-ville.syrjala@linux.intel.com
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Tested-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
(cherry picked from commit 73714c05df97d7527e7eaaa771472ef2ede46fa3)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

1 files changed, 7 insertions, 12 deletions

diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
index ded2add18b26..d93c58410bff 100644
--- a/drivers/gpu/drm/i915/intel_fbc.c
+++ b/drivers/gpu/drm/i915/intel_fbc.c
@@ -82,20 +82,10 @@ static unsigned int get_crtc_fence_y_offset(struct intel_crtc *crtc)
 static void intel_fbc_get_plane_source_size(struct intel_fbc_state_cache *cache,
                                             int *width, int *height)
 {
-        int w, h;
-
-        if (drm_rotation_90_or_270(cache->plane.rotation)) {
-                w = cache->plane.src_h;
-                h = cache->plane.src_w;
-        } else {
-                w = cache->plane.src_w;
-                h = cache->plane.src_h;
-        }
-
         if (width)
-                *width = w;
+                *width = cache->plane.src_w;
         if (height)
-                *height = h;
+                *height = cache->plane.src_h;
 }
 
 static int intel_fbc_calculate_cfb_size(struct drm_i915_private *dev_priv,
@@ -746,6 +736,11 @@ static void intel_fbc_update_state_cache(struct intel_crtc *crtc,
                 cache->crtc.hsw_bdw_pixel_rate = crtc_state->pixel_rate;
 
         cache->plane.rotation = plane_state->base.rotation;
+        /*
+         * Src coordinates are already rotated by 270 degrees for
+         * the 90/270 degree plane rotation cases (to match the
+         * GTT mapping), hence no need to account for rotation here.
+         */
         cache->plane.src_w = drm_rect_width(&plane_state->base.src) >> 16;
         cache->plane.src_h = drm_rect_height(&plane_state->base.src) >> 16;
         cache->plane.visible = plane_state->base.visible;