drm/i915/gen11: Program the chroma upsampler for HDR planes.

We configure the chroma upsampler with the same chroma siting as
used by the scaler for consistency, the chroma upsampler is used
instead of the scaler for YUV 4:2:0 on ICL's HDR planes.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181018115134.9061-7-maarten.lankhorst@linux.intel.com

drivers/gpu/drm/i915/i915_reg.h

@@ -6550,6 +6550,19 @@ enum {
 #define _PLANE_AUX_DIST_2_A			0x702c0
 #define _PLANE_AUX_OFFSET_1_A			0x701c4
 #define _PLANE_AUX_OFFSET_2_A			0x702c4
+#define _PLANE_CUS_CTL_1_A			0x701c8
+#define _PLANE_CUS_CTL_2_A			0x702c8
+#define  PLANE_CUS_ENABLE			(1 << 31)
+#define  PLANE_CUS_PLANE_6			(0 << 30)
+#define  PLANE_CUS_PLANE_7			(1 << 30)
+#define  PLANE_CUS_HPHASE_SIGN_NEGATIVE		(1 << 19)
+#define  PLANE_CUS_HPHASE_0			(0 << 16)
+#define  PLANE_CUS_HPHASE_0_25			(1 << 16)
+#define  PLANE_CUS_HPHASE_0_5			(2 << 16)
+#define  PLANE_CUS_VPHASE_SIGN_NEGATIVE		(1 << 15)
+#define  PLANE_CUS_VPHASE_0			(0 << 12)
+#define  PLANE_CUS_VPHASE_0_25			(1 << 12)
+#define  PLANE_CUS_VPHASE_0_5			(2 << 12)
 #define _PLANE_COLOR_CTL_1_A			0x701CC /* GLK+ */
 #define _PLANE_COLOR_CTL_2_A			0x702CC /* GLK+ */
 #define _PLANE_COLOR_CTL_3_A			0x703CC /* GLK+ */
@@ -6687,6 +6700,15 @@ enum {
 #define PLANE_AUX_OFFSET(pipe, plane)   \
 	_MMIO_PLANE(plane, _PLANE_AUX_OFFSET_1(pipe), _PLANE_AUX_OFFSET_2(pipe))
 
+#define _PLANE_CUS_CTL_1_B		0x711c8
+#define _PLANE_CUS_CTL_2_B		0x712c8
+#define _PLANE_CUS_CTL_1(pipe)       \
+		_PIPE(pipe, _PLANE_CUS_CTL_1_A, _PLANE_CUS_CTL_1_B)
+#define _PLANE_CUS_CTL_2(pipe)       \
+		_PIPE(pipe, _PLANE_CUS_CTL_2_A, _PLANE_CUS_CTL_2_B)
+#define PLANE_CUS_CTL(pipe, plane)   \
+	_MMIO_PLANE(plane, _PLANE_CUS_CTL_1(pipe), _PLANE_CUS_CTL_2(pipe))
+
 #define _PLANE_COLOR_CTL_1_B			0x711CC
 #define _PLANE_COLOR_CTL_2_B			0x712CC
 #define _PLANE_COLOR_CTL_3_B			0x713CC

drivers/gpu/drm/i915/intel_sprite.c

@@ -380,6 +380,7 @@ skl_update_plane(struct intel_plane *plane,
 	uint32_t y = plane_state->color_plane[0].y;
 	uint32_t src_w = drm_rect_width(&plane_state->base.src) >> 16;
 	uint32_t src_h = drm_rect_height(&plane_state->base.src) >> 16;
+	struct intel_plane *linked = plane_state->linked_plane;
 	unsigned long irqflags;
 	u32 keymsk = 0, keymax = 0;
 
@@ -417,6 +418,27 @@ skl_update_plane(struct intel_plane *plane,
 		      (plane_state->color_plane[1].y << 16) |
 		      plane_state->color_plane[1].x);
 
+	if (icl_is_hdr_plane(plane)) {
+		u32 cus_ctl = 0;
+
+		if (linked) {
+			/* Enable and use MPEG-2 chroma siting */
+			cus_ctl = PLANE_CUS_ENABLE |
+				PLANE_CUS_HPHASE_0 |
+				PLANE_CUS_VPHASE_SIGN_NEGATIVE |
+				PLANE_CUS_VPHASE_0_25;
+
+			if (linked->id == PLANE_SPRITE5)
+				cus_ctl |= PLANE_CUS_PLANE_7;
+			else if (linked->id == PLANE_SPRITE4)
+				cus_ctl |= PLANE_CUS_PLANE_6;
+			else
+				MISSING_CASE(linked->id);
+		}
+
+		I915_WRITE_FW(PLANE_CUS_CTL(pipe, plane_id), cus_ctl);
+	}
+
 	/* program plane scaler */
 	if (plane_state->scaler_id >= 0) {
 		skl_program_scaler(dev_priv, plane, crtc_state, plane_state);