drm/vc4: hdmi: Add a CSC setup callback

Similarly to the previous patches, the CSC setup is slightly different in
the BCM2711 than in the previous generations. Let's add a callback for it.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Tested-by: Chanwoo Choi <cw00.choi@samsung.com>
Tested-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Link: https://patchwork.freedesktop.org/patch/msgid/5c19bbf10153cb42ca0fb67e08606c8295c17236.1599120059.git-series.maxime@cerno.tech

drivers/gpu/drm/vc4/vc4_hdmi.c

@@ -334,6 +334,41 @@ static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder)
 		DRM_ERROR("Failed to release power domain: %d\n", ret);
 }
 
+static void vc4_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi, bool enable)
+{
+	u32 csc_ctl;
+
+	csc_ctl = VC4_SET_FIELD(VC4_HD_CSC_CTL_ORDER_BGR,
+				VC4_HD_CSC_CTL_ORDER);
+
+	if (enable) {
+		/* CEA VICs other than #1 requre limited range RGB
+		 * output unless overridden by an AVI infoframe.
+		 * Apply a colorspace conversion to squash 0-255 down
+		 * to 16-235.  The matrix here is:
+		 *
+		 * [ 0      0      0.8594 16]
+		 * [ 0      0.8594 0      16]
+		 * [ 0.8594 0      0      16]
+		 * [ 0      0      0       1]
+		 */
+		csc_ctl |= VC4_HD_CSC_CTL_ENABLE;
+		csc_ctl |= VC4_HD_CSC_CTL_RGB2YCC;
+		csc_ctl |= VC4_SET_FIELD(VC4_HD_CSC_CTL_MODE_CUSTOM,
+					 VC4_HD_CSC_CTL_MODE);
+
+		HDMI_WRITE(HDMI_CSC_12_11, (0x000 << 16) | 0x000);
+		HDMI_WRITE(HDMI_CSC_14_13, (0x100 << 16) | 0x6e0);
+		HDMI_WRITE(HDMI_CSC_22_21, (0x6e0 << 16) | 0x000);
+		HDMI_WRITE(HDMI_CSC_24_23, (0x100 << 16) | 0x000);
+		HDMI_WRITE(HDMI_CSC_32_31, (0x000 << 16) | 0x6e0);
+		HDMI_WRITE(HDMI_CSC_34_33, (0x100 << 16) | 0x000);
+	}
+
+	/* The RGB order applies even when CSC is disabled. */
+	HDMI_WRITE(HDMI_CSC_CTL, csc_ctl);
+}
+
 static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
 {
 	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
@@ -357,7 +392,6 @@ static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
 					mode->crtc_vsync_end -
 					interlaced,
 					VC4_HDMI_VERTB_VBP));
-	u32 csc_ctl;
 	int ret;
 
 	ret = pm_runtime_get_sync(&vc4_hdmi->pdev->dev);
@@ -428,41 +462,20 @@ static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
 		   (vsync_pos ? 0 : VC4_HD_VID_CTL_VSYNC_LOW) |
 		   (hsync_pos ? 0 : VC4_HD_VID_CTL_HSYNC_LOW));
 
-	csc_ctl = VC4_SET_FIELD(VC4_HD_CSC_CTL_ORDER_BGR,
-				VC4_HD_CSC_CTL_ORDER);
 
 	if (vc4_encoder->hdmi_monitor &&
-	    drm_default_rgb_quant_range(mode) ==
-	    HDMI_QUANTIZATION_RANGE_LIMITED) {
-		/* CEA VICs other than #1 requre limited range RGB
-		 * output unless overridden by an AVI infoframe.
-		 * Apply a colorspace conversion to squash 0-255 down
-		 * to 16-235.  The matrix here is:
-		 *
-		 * [ 0      0      0.8594 16]
-		 * [ 0      0.8594 0      16]
-		 * [ 0.8594 0      0      16]
-		 * [ 0      0      0       1]
-		 */
-		csc_ctl |= VC4_HD_CSC_CTL_ENABLE;
-		csc_ctl |= VC4_HD_CSC_CTL_RGB2YCC;
-		csc_ctl |= VC4_SET_FIELD(VC4_HD_CSC_CTL_MODE_CUSTOM,
-					 VC4_HD_CSC_CTL_MODE);
+	    drm_default_rgb_quant_range(mode) == HDMI_QUANTIZATION_RANGE_LIMITED) {
+		if (vc4_hdmi->variant->csc_setup)
+			vc4_hdmi->variant->csc_setup(vc4_hdmi, true);
 
-		HDMI_WRITE(HDMI_CSC_12_11, (0x000 << 16) | 0x000);
-		HDMI_WRITE(HDMI_CSC_14_13, (0x100 << 16) | 0x6e0);
-		HDMI_WRITE(HDMI_CSC_22_21, (0x6e0 << 16) | 0x000);
-		HDMI_WRITE(HDMI_CSC_24_23, (0x100 << 16) | 0x000);
-		HDMI_WRITE(HDMI_CSC_32_31, (0x000 << 16) | 0x6e0);
-		HDMI_WRITE(HDMI_CSC_34_33, (0x100 << 16) | 0x000);
 		vc4_encoder->limited_rgb_range = true;
 	} else {
+		if (vc4_hdmi->variant->csc_setup)
+			vc4_hdmi->variant->csc_setup(vc4_hdmi, false);
+
 		vc4_encoder->limited_rgb_range = false;
 	}
 
-	/* The RGB order applies even when CSC is disabled. */
-	HDMI_WRITE(HDMI_CSC_CTL, csc_ctl);
-
 	HDMI_WRITE(HDMI_FIFO_CTL, VC4_HDMI_FIFO_CTL_MASTER_SLAVE_N);
 
 	if (debug_dump_regs) {
@@ -1430,6 +1443,7 @@ static const struct vc4_hdmi_variant bcm2835_variant = {
 	.num_registers		= ARRAY_SIZE(vc4_hdmi_fields),
 
 	.init_resources		= vc4_hdmi_init_resources,
+	.csc_setup		= vc4_hdmi_csc_setup,
 	.reset			= vc4_hdmi_reset,
 	.phy_init		= vc4_hdmi_phy_init,
 	.phy_disable		= vc4_hdmi_phy_disable,

drivers/gpu/drm/vc4/vc4_hdmi.h

@@ -41,6 +41,9 @@ struct vc4_hdmi_variant {
 	/* Callback to reset the HDMI block */
 	void (*reset)(struct vc4_hdmi *vc4_hdmi);
 
+	/* Callback to enable / disable the CSC */
+	void (*csc_setup)(struct vc4_hdmi *vc4_hdmi, bool enable);
+
 	/* Callback to initialize the PHY according to the mode */
 	void (*phy_init)(struct vc4_hdmi *vc4_hdmi,
 			 struct drm_display_mode *mode);