drm/meson: Add G12A support for CVBS Encoder

The Meson G12A SoCs uses the exact same CVBS encoder except a simple
CVBS DAC register offset and settings delta.
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
[narmstrong: fixed subject typo]
Tested-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190325141824.21259-9-narmstrong@baylibre.com

drivers/gpu/drm/meson/meson_venc.c

@@ -73,7 +73,9 @@
 /* HHI Registers */
 #define HHI_GCLK_MPEG2		0x148 /* 0x52 offset in data sheet */
 #define HHI_VDAC_CNTL0		0x2F4 /* 0xbd offset in data sheet */
+#define HHI_VDAC_CNTL0_G12A	0x2EC /* 0xbd offset in data sheet */
 #define HHI_VDAC_CNTL1		0x2F8 /* 0xbe offset in data sheet */
+#define HHI_VDAC_CNTL1_G12A	0x2F0 /* 0xbe offset in data sheet */
 #define HHI_HDMI_PHY_CNTL0	0x3a0 /* 0xe8 offset in data sheet */
 
 struct meson_cvbs_enci_mode meson_cvbs_enci_pal = {
@@ -1675,8 +1677,13 @@ void meson_venc_disable_vsync(struct meson_drm *priv)
 void meson_venc_init(struct meson_drm *priv)
 {
 	/* Disable CVBS VDAC */
+	if (meson_vpu_is_compatible(priv, "amlogic,meson-g12a-vpu")) {
+		regmap_write(priv->hhi, HHI_VDAC_CNTL0_G12A, 0);
+		regmap_write(priv->hhi, HHI_VDAC_CNTL1_G12A, 8);
+	} else {
 		regmap_write(priv->hhi, HHI_VDAC_CNTL0, 0);
 		regmap_write(priv->hhi, HHI_VDAC_CNTL1, 8);
+	}
 
 	/* Power Down Dacs */
 	writel_relaxed(0xff, priv->io_base + _REG(VENC_VDAC_SETTING));

drivers/gpu/drm/meson/meson_venc_cvbs.c

@@ -37,7 +37,9 @@
 
 /* HHI VDAC Registers */
 #define HHI_VDAC_CNTL0		0x2F4 /* 0xbd offset in data sheet */
+#define HHI_VDAC_CNTL0_G12A	0x2EC /* 0xbd offset in data sheet */
 #define HHI_VDAC_CNTL1		0x2F8 /* 0xbe offset in data sheet */
+#define HHI_VDAC_CNTL1_G12A	0x2F0 /* 0xbe offset in data sheet */
 
 struct meson_venc_cvbs {
 	struct drm_encoder	encoder;
@@ -166,8 +168,13 @@ static void meson_venc_cvbs_encoder_disable(struct drm_encoder *encoder)
 	struct meson_drm *priv = meson_venc_cvbs->priv;
 
 	/* Disable CVBS VDAC */
+	if (meson_vpu_is_compatible(priv, "amlogic,meson-g12a-vpu")) {
+		regmap_write(priv->hhi, HHI_VDAC_CNTL0_G12A, 0);
+		regmap_write(priv->hhi, HHI_VDAC_CNTL1_G12A, 0);
+	} else {
 		regmap_write(priv->hhi, HHI_VDAC_CNTL0, 0);
 		regmap_write(priv->hhi, HHI_VDAC_CNTL1, 8);
+	}
 }
 
 static void meson_venc_cvbs_encoder_enable(struct drm_encoder *encoder)
@@ -179,13 +186,17 @@ static void meson_venc_cvbs_encoder_enable(struct drm_encoder *encoder)
 	/* VDAC0 source is not from ATV */
 	writel_bits_relaxed(BIT(5), 0, priv->io_base + _REG(VENC_VDAC_DACSEL0));
 
-	if (meson_vpu_is_compatible(priv, "amlogic,meson-gxbb-vpu"))
+	if (meson_vpu_is_compatible(priv, "amlogic,meson-gxbb-vpu")) {
 		regmap_write(priv->hhi, HHI_VDAC_CNTL0, 1);
-	else if (meson_vpu_is_compatible(priv, "amlogic,meson-gxm-vpu") ||
-		 meson_vpu_is_compatible(priv, "amlogic,meson-gxl-vpu"))
+		regmap_write(priv->hhi, HHI_VDAC_CNTL1, 0);
+	} else if (meson_vpu_is_compatible(priv, "amlogic,meson-gxm-vpu") ||
+		 meson_vpu_is_compatible(priv, "amlogic,meson-gxl-vpu")) {
 		regmap_write(priv->hhi, HHI_VDAC_CNTL0, 0xf0001);
-
 		regmap_write(priv->hhi, HHI_VDAC_CNTL1, 0);
+	} else if (meson_vpu_is_compatible(priv, "amlogic,meson-g12a-vpu")) {
+		regmap_write(priv->hhi, HHI_VDAC_CNTL0_G12A, 0x906001);
+		regmap_write(priv->hhi, HHI_VDAC_CNTL1_G12A, 0);
+	}
 }
 
 static void meson_venc_cvbs_encoder_mode_set(struct drm_encoder *encoder,