drm/rockchip: dw_hdmi: add dw-hdmi support for the rk3328

The rk3328 uses a dw-hdmi controller with an external hdmi phy from
Innosilicon which uses the generic phy framework for access.
Add the necessary data and the compatible for the rk3328 to the
rockchip dw-hdmi driver.

changes in v5:
- disable CEC_5V option to make CEC actually work (Jonas)
changes in v3:
- reword as suggested by Rob to show that it's a dw-hdmi + Inno phy
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Zheng Yang <zhengyang@rock-chips.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180912124740.20343-7-heiko@sntech.de

Documentation/devicetree/bindings/display/rockchip/dw_hdmi-rockchip.txt

@@ -13,6 +13,7 @@ Required properties:
 
 - compatible: should be one of the following:
 		"rockchip,rk3288-dw-hdmi"
+		"rockchip,rk3328-dw-hdmi"
 		"rockchip,rk3399-dw-hdmi"
 - reg: See dw_hdmi.txt.
 - reg-io-width: See dw_hdmi.txt. Shall be 4.

drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c

@@ -25,6 +25,24 @@
 
 #define RK3288_GRF_SOC_CON6		0x025C
 #define RK3288_HDMI_LCDC_SEL		BIT(4)
+#define RK3328_GRF_SOC_CON2		0x0408
+
+#define RK3328_HDMI_SDAIN_MSK		BIT(11)
+#define RK3328_HDMI_SCLIN_MSK		BIT(10)
+#define RK3328_HDMI_HPD_IOE		BIT(2)
+#define RK3328_GRF_SOC_CON3		0x040c
+/* need to be unset if hdmi or i2c should control voltage */
+#define RK3328_HDMI_SDA5V_GRF		BIT(15)
+#define RK3328_HDMI_SCL5V_GRF		BIT(14)
+#define RK3328_HDMI_HPD5V_GRF		BIT(13)
+#define RK3328_HDMI_CEC5V_GRF		BIT(12)
+#define RK3328_GRF_SOC_CON4		0x0410
+#define RK3328_HDMI_HPD_SARADC		BIT(13)
+#define RK3328_HDMI_CEC_5V		BIT(11)
+#define RK3328_HDMI_SDA_5V		BIT(10)
+#define RK3328_HDMI_SCL_5V		BIT(9)
+#define RK3328_HDMI_HPD_5V		BIT(8)
+
 #define RK3399_GRF_SOC_CON20		0x6250
 #define RK3399_HDMI_LCDC_SEL		BIT(6)
 
@@ -292,6 +310,66 @@ static const struct drm_encoder_helper_funcs dw_hdmi_rockchip_encoder_helper_fun
 	.atomic_check = dw_hdmi_rockchip_encoder_atomic_check,
 };
 
+static int dw_hdmi_rockchip_genphy_init(struct dw_hdmi *dw_hdmi, void *data,
+			     struct drm_display_mode *mode)
+{
+	struct rockchip_hdmi *hdmi = (struct rockchip_hdmi *)data;
+
+	return phy_power_on(hdmi->phy);
+}
+
+static void dw_hdmi_rockchip_genphy_disable(struct dw_hdmi *dw_hdmi, void *data)
+{
+	struct rockchip_hdmi *hdmi = (struct rockchip_hdmi *)data;
+
+	phy_power_off(hdmi->phy);
+}
+
+static enum drm_connector_status
+dw_hdmi_rk3328_read_hpd(struct dw_hdmi *dw_hdmi, void *data)
+{
+	struct rockchip_hdmi *hdmi = (struct rockchip_hdmi *)data;
+	enum drm_connector_status status;
+
+	status = dw_hdmi_phy_read_hpd(dw_hdmi, data);
+
+	if (status == connector_status_connected)
+		regmap_write(hdmi->regmap,
+			RK3328_GRF_SOC_CON4,
+			HIWORD_UPDATE(RK3328_HDMI_SDA_5V | RK3328_HDMI_SCL_5V,
+				      RK3328_HDMI_SDA_5V | RK3328_HDMI_SCL_5V));
+	else
+		regmap_write(hdmi->regmap,
+			RK3328_GRF_SOC_CON4,
+			HIWORD_UPDATE(0, RK3328_HDMI_SDA_5V |
+					 RK3328_HDMI_SCL_5V));
+	return status;
+}
+
+static void dw_hdmi_rk3328_setup_hpd(struct dw_hdmi *dw_hdmi, void *data)
+{
+	struct rockchip_hdmi *hdmi = (struct rockchip_hdmi *)data;
+
+	dw_hdmi_phy_setup_hpd(dw_hdmi, data);
+
+	/* Enable and map pins to 3V grf-controlled io-voltage */
+	regmap_write(hdmi->regmap,
+		RK3328_GRF_SOC_CON4,
+		HIWORD_UPDATE(0, RK3328_HDMI_HPD_SARADC | RK3328_HDMI_CEC_5V |
+				 RK3328_HDMI_SDA_5V | RK3328_HDMI_SCL_5V |
+				 RK3328_HDMI_HPD_5V));
+	regmap_write(hdmi->regmap,
+		RK3328_GRF_SOC_CON3,
+		HIWORD_UPDATE(0, RK3328_HDMI_SDA5V_GRF | RK3328_HDMI_SCL5V_GRF |
+				 RK3328_HDMI_HPD5V_GRF |
+				 RK3328_HDMI_CEC5V_GRF));
+	regmap_write(hdmi->regmap,
+		RK3328_GRF_SOC_CON2,
+		HIWORD_UPDATE(RK3328_HDMI_SDAIN_MSK | RK3328_HDMI_SCLIN_MSK,
+			      RK3328_HDMI_SDAIN_MSK | RK3328_HDMI_SCLIN_MSK |
+			      RK3328_HDMI_HPD_IOE));
+}
+
 static struct rockchip_hdmi_chip_data rk3288_chip_data = {
 	.lcdsel_grf_reg = RK3288_GRF_SOC_CON6,
 	.lcdsel_big = HIWORD_UPDATE(0, RK3288_HDMI_LCDC_SEL),
@@ -306,6 +384,29 @@ static const struct dw_hdmi_plat_data rk3288_hdmi_drv_data = {
 	.phy_data = &rk3288_chip_data,
 };
 
+static const struct dw_hdmi_phy_ops rk3328_hdmi_phy_ops = {
+	.init		= dw_hdmi_rockchip_genphy_init,
+	.disable	= dw_hdmi_rockchip_genphy_disable,
+	.read_hpd	= dw_hdmi_rk3328_read_hpd,
+	.update_hpd	= dw_hdmi_phy_update_hpd,
+	.setup_hpd	= dw_hdmi_rk3328_setup_hpd,
+};
+
+static struct rockchip_hdmi_chip_data rk3328_chip_data = {
+	.lcdsel_grf_reg = -1,
+};
+
+static const struct dw_hdmi_plat_data rk3328_hdmi_drv_data = {
+	.mode_valid = dw_hdmi_rockchip_mode_valid,
+	.mpll_cfg = rockchip_mpll_cfg,
+	.cur_ctr = rockchip_cur_ctr,
+	.phy_config = rockchip_phy_config,
+	.phy_data = &rk3328_chip_data,
+	.phy_ops = &rk3328_hdmi_phy_ops,
+	.phy_name = "inno_dw_hdmi_phy2",
+	.phy_force_vendor = true,
+};
+
 static struct rockchip_hdmi_chip_data rk3399_chip_data = {
 	.lcdsel_grf_reg = RK3399_GRF_SOC_CON20,
 	.lcdsel_big = HIWORD_UPDATE(0, RK3399_HDMI_LCDC_SEL),
@@ -324,6 +425,9 @@ static const struct of_device_id dw_hdmi_rockchip_dt_ids[] = {
 	{ .compatible = "rockchip,rk3288-dw-hdmi",
 	  .data = &rk3288_hdmi_drv_data
 	},
+	{ .compatible = "rockchip,rk3328-dw-hdmi",
+	  .data = &rk3328_hdmi_drv_data
+	},
 	{ .compatible = "rockchip,rk3399-dw-hdmi",
 	  .data = &rk3399_hdmi_drv_data
 	},