drm/i915/skl: Add 180 degree HW rotation support

Add support for 180 degree rotation for primary and sprite planes
Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_reg.h

@@ -4579,6 +4579,9 @@ enum punit_power_well {
 #define   PLANE_CTL_ALPHA_DISABLE		(  0 << 4)
 #define   PLANE_CTL_ALPHA_SW_PREMULTIPLY	(  2 << 4)
 #define   PLANE_CTL_ALPHA_HW_PREMULTIPLY	(  3 << 4)
+#define   PLANE_CTL_ROTATE_MASK			0x3
+#define   PLANE_CTL_ROTATE_0			0x0
+#define   PLANE_CTL_ROTATE_180			0x2
 #define _PLANE_STRIDE_1_A			0x70188
 #define _PLANE_STRIDE_2_A			0x70288
 #define _PLANE_STRIDE_3_A			0x70388

drivers/gpu/drm/i915/intel_display.c

@@ -2694,6 +2694,8 @@ static void skylake_update_primary_plane(struct drm_crtc *crtc,
 	}
 
 	plane_ctl |= PLANE_CTL_PLANE_GAMMA_DISABLE;
+	if (to_intel_plane(crtc->primary)->rotation == BIT(DRM_ROTATE_180))
+		plane_ctl |= PLANE_CTL_ROTATE_180;
 
 	I915_WRITE(PLANE_CTL(pipe, 0), plane_ctl);
 

drivers/gpu/drm/i915/intel_sprite.c

@@ -162,6 +162,7 @@ skl_update_plane(struct drm_plane *drm_plane, struct drm_crtc *crtc,
 	plane_ctl &= ~PLANE_CTL_YUV422_ORDER_MASK;
 	plane_ctl &= ~PLANE_CTL_TILED_MASK;
 	plane_ctl &= ~PLANE_CTL_ALPHA_MASK;
+	plane_ctl &= ~PLANE_CTL_ROTATE_MASK;
 
 	/* Trickle feed has to be enabled */
 	plane_ctl &= ~PLANE_CTL_TRICKLE_FEED_DISABLE;
@@ -217,6 +218,8 @@ skl_update_plane(struct drm_plane *drm_plane, struct drm_crtc *crtc,
 	default:
 		BUG();
 	}
+	if (intel_plane->rotation == BIT(DRM_ROTATE_180))
+		plane_ctl |= PLANE_CTL_ROTATE_180;
 
 	plane_ctl |= PLANE_CTL_ENABLE;
 	plane_ctl |= PLANE_CTL_PIPE_CSC_ENABLE;