drm/i915: Add horizontal mirroring support for CHV pipe B planes

The primary and sprite planes on CHV pipe B support horizontal
mirroring. Expose it to the world.

Sadly the hardware ignores the mirror bit when the rotate bit is
set, so we'll have to reject the 180+X case.

v2: Drop the BIT()
v3: Pass dev_priv instead of dev to IS_CHERRYVIEW()

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1479142440-25283-4-git-send-email-ville.syrjala@linux.intel.com

3 files changed, 27 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_atomic_plane.c b/drivers/gpu/drm/i915/intel_atomic_plane.c
index cb5594411bb6..71a0433cd6c3 100644
--- a/drivers/gpu/drm/i915/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/intel_atomic_plane.c
@@ -106,6 +106,7 @@ intel_plane_destroy_state(struct drm_plane *plane,
 static int intel_plane_atomic_check(struct drm_plane *plane,
                                     struct drm_plane_state *state)
 {
+        struct drm_i915_private *dev_priv = to_i915(plane->dev);
         struct drm_crtc *crtc = state->crtc;
         struct intel_crtc *intel_crtc;
         struct intel_crtc_state *crtc_state;
@@ -167,6 +168,14 @@ static int intel_plane_atomic_check(struct drm_plane *plane,
                 }
         }
 
+        /* CHV ignores the mirror bit when the rotate bit is set :( */
+        if (IS_CHERRYVIEW(dev_priv) &&
+            state->rotation & DRM_ROTATE_180 &&
+            state->rotation & DRM_REFLECT_X) {
+                DRM_DEBUG_KMS("Cannot rotate and reflect at the same time\n");
+                return -EINVAL;
+        }
+
         intel_state->base.visible = false;
         ret = intel_plane->check_plane(plane, crtc_state, intel_state);
         if (ret)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index ecc7b5b444f6..c2ba36b37fba 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3078,6 +3078,9 @@ static void i9xx_update_primary_plane(struct drm_plane *primary,
         if (rotation & DRM_ROTATE_180)
                 dspcntr |= DISPPLANE_ROTATE_180;
 
+        if (rotation & DRM_REFLECT_X)
+                dspcntr |= DISPPLANE_MIRROR;
+
         if (IS_G4X(dev_priv))
                 dspcntr |= DISPPLANE_TRICKLE_FEED_DISABLE;
 
@@ -3090,6 +3093,8 @@ static void i9xx_update_primary_plane(struct drm_plane *primary,
         if (rotation & DRM_ROTATE_180) {
                 x += crtc_state->pipe_src_w - 1;
                 y += crtc_state->pipe_src_h - 1;
+        } else if (rotation & DRM_REFLECT_X) {
+                x += crtc_state->pipe_src_w - 1;
         }
 
         linear_offset = intel_fb_xy_to_linear(x, y, plane_state, 0);
@@ -15065,6 +15070,10 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
                 supported_rotations =
                         DRM_ROTATE_0 | DRM_ROTATE_90 |
                         DRM_ROTATE_180 | DRM_ROTATE_270;
+        } else if (IS_CHERRYVIEW(dev_priv) && pipe == PIPE_B) {
+                supported_rotations =
+                        DRM_ROTATE_0 | DRM_ROTATE_180 |
+                        DRM_REFLECT_X;
         } else if (INTEL_GEN(dev_priv) >= 4) {
                 supported_rotations =
                         DRM_ROTATE_0 | DRM_ROTATE_180;
diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index 7951b70bf792..7b761826a738 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -430,6 +430,9 @@ vlv_update_plane(struct drm_plane *dplane,
         if (rotation & DRM_ROTATE_180)
                 sprctl |= SP_ROTATE_180;
 
+        if (rotation & DRM_REFLECT_X)
+                sprctl |= SP_MIRROR;
+
         /* Sizes are 0 based */
         src_w--;
         src_h--;
@@ -442,6 +445,8 @@ vlv_update_plane(struct drm_plane *dplane,
         if (rotation & DRM_ROTATE_180) {
                 x += src_w;
                 y += src_h;
+        } else if (rotation & DRM_REFLECT_X) {
+                x += src_w;
         }
 
         linear_offset = intel_fb_xy_to_linear(x, y, plane_state, 0);
@@ -1121,6 +1126,10 @@ intel_sprite_plane_create(struct drm_i915_private *dev_priv,
                 supported_rotations =
                         DRM_ROTATE_0 | DRM_ROTATE_90 |
                         DRM_ROTATE_180 | DRM_ROTATE_270;
+        } else if (IS_CHERRYVIEW(dev_priv) && pipe == PIPE_B) {
+                supported_rotations =
+                        DRM_ROTATE_0 | DRM_ROTATE_180 |
+                        DRM_REFLECT_X;
         } else {
                 supported_rotations =
                         DRM_ROTATE_0 | DRM_ROTATE_180;