[PATCH 7/7] drm/i915: Add horizontal mirroring support for CHV pipe B planes

[ville.syrjala at linux.intel.com]

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

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.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_atomic_plane.c |  8 ++++++++
 drivers/gpu/drm/i915/intel_display.c      | 10 ++++++++++
 drivers/gpu/drm/i915/intel_sprite.c       | 10 ++++++++++
 3 files changed, 28 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_atomic_plane.c b/drivers/gpu/drm/i915/intel_atomic_plane.c
index c19eb9a0cd4a..0a019eacfede 100644
--- a/drivers/gpu/drm/i915/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/intel_atomic_plane.c
@@ -180,6 +180,14 @@ static int intel_plane_atomic_check(struct drm_plane *plane,
 		}
 	}
 
+	/* CHV ignores the mirror bit when the rotate bit is set :( */
+	if (IS_CHERRYVIEW(plane->dev) &&
+	    state->rotation & BIT(DRM_ROTATE_180) &&
+	    state->rotation & BIT(DRM_REFLECT_X)) {
+		DRM_DEBUG_KMS("Cannot rotate and reflect at the same time\n");
+		return -EINVAL;
+	}
+
 	intel_state->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 88a7c4173715..edb1809a642d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2677,6 +2677,9 @@ static void i9xx_update_primary_plane(struct drm_plane *primary,
 	if (rotation & BIT(DRM_ROTATE_180))
 		dspcntr |= DISPPLANE_ROTATE_180;
 
+	if (rotation & BIT(DRM_REFLECT_X))
+		dspcntr |= DISPPLANE_MIRROR;
+
 	if (IS_G4X(dev))
 		dspcntr |= DISPPLANE_TRICKLE_FEED_DISABLE;
 
@@ -2700,6 +2703,9 @@ static void i9xx_update_primary_plane(struct drm_plane *primary,
 		linear_offset +=
 			(crtc_state->pipe_src_h - 1) * fb->pitches[0] +
 			(crtc_state->pipe_src_w - 1) * cpp;
+	} else if (rotation & BIT(DRM_REFLECT_X)) {
+		x += (crtc_state->pipe_src_w - 1);
+		linear_offset += (crtc_state->pipe_src_w - 1) * cpp;
 	}
 
 	intel_crtc->adjusted_x = x;
@@ -14295,6 +14301,10 @@ static struct drm_plane *intel_primary_plane_create(struct drm_device *dev,
 		supported_rotations =
 			BIT(DRM_ROTATE_0) | BIT(DRM_ROTATE_90) |
 			BIT(DRM_ROTATE_180) | BIT(DRM_ROTATE_270);
+	} else if (IS_CHERRYVIEW(dev) && pipe == PIPE_B) {
+		supported_rotations =
+			BIT(DRM_ROTATE_0) | BIT(DRM_ROTATE_180) |
+			BIT(DRM_REFLECT_X);
 	} else if (INTEL_INFO(dev)->gen >= 4) {
 		supported_rotations =
 			BIT(DRM_ROTATE_0) | BIT(DRM_ROTATE_180);
diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index 14173f53f520..4d6cd1a02e34 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -436,6 +436,9 @@ vlv_update_plane(struct drm_plane *dplane,
 	if (rotation & BIT(DRM_ROTATE_180))
 		sprctl |= SP_ROTATE_180;
 
+	if (rotation & BIT(DRM_REFLECT_X))
+		sprctl |= SP_MIRROR;
+
 	/* Sizes are 0 based */
 	src_w--;
 	src_h--;
@@ -451,6 +454,9 @@ vlv_update_plane(struct drm_plane *dplane,
 		x += src_w;
 		y += src_h;
 		linear_offset += src_h * fb->pitches[0] + src_w * cpp;
+	} else if (rotation & BIT(DRM_REFLECT_X)) {
+		x += src_w;
+		linear_offset += src_w * cpp;
 	}
 
 	if (key->flags) {
@@ -1128,6 +1134,10 @@ intel_plane_init(struct drm_device *dev, enum pipe pipe, int plane)
 		supported_rotations =
 			BIT(DRM_ROTATE_0) | BIT(DRM_ROTATE_90) |
 			BIT(DRM_ROTATE_180) | BIT(DRM_ROTATE_270);
+	} else if (IS_CHERRYVIEW(dev) && pipe == PIPE_B) {
+		supported_rotations =
+			BIT(DRM_ROTATE_0) | BIT(DRM_ROTATE_180) |
+			BIT(DRM_REFLECT_X);
 	} else {
 		supported_rotations =
 			BIT(DRM_ROTATE_0) | BIT(DRM_ROTATE_180);
-- 
2.7.4