drm/rockchip: lvds: Add PX30 support

Introduce PX30 LVDS support. This means adding the relevant helper
functions, a specific probe and also the initialization of a specific
PHY.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20191224143900.23567-10-miquel.raynal@bootlin.com

drivers/gpu/drm/rockchip/rockchip_lvds.c

@@ -10,6 +10,7 @@
 #include <linux/component.h>
 #include <linux/mfd/syscon.h>
 #include <linux/of_graph.h>
+#include <linux/phy/phy.h>
 #include <linux/pinctrl/devinfo.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
@@ -54,6 +55,7 @@ struct rockchip_lvds {
 	void __iomem *regs;
 	struct regmap *grf;
 	struct clk *pclk;
+	struct phy *dphy;
 	const struct rockchip_lvds_soc_data *soc_data;
 	int output; /* rgb lvds or dual lvds output */
 	int format; /* vesa or jeida format */
@@ -322,6 +324,103 @@ static void rk3288_lvds_encoder_disable(struct drm_encoder *encoder)
 	drm_panel_unprepare(lvds->panel);
 }
 
+static int px30_lvds_poweron(struct rockchip_lvds *lvds)
+{
+	int ret;
+
+	ret = pm_runtime_get_sync(lvds->dev);
+	if (ret < 0) {
+		DRM_DEV_ERROR(lvds->dev, "failed to get pm runtime: %d\n", ret);
+		return ret;
+	}
+
+	/* Enable LVDS mode */
+	return regmap_update_bits(lvds->grf, PX30_LVDS_GRF_PD_VO_CON1,
+				  PX30_LVDS_MODE_EN(1) | PX30_LVDS_P2S_EN(1),
+				  PX30_LVDS_MODE_EN(1) | PX30_LVDS_P2S_EN(1));
+}
+
+static void px30_lvds_poweroff(struct rockchip_lvds *lvds)
+{
+	regmap_update_bits(lvds->grf, PX30_LVDS_GRF_PD_VO_CON1,
+			   PX30_LVDS_MODE_EN(1) | PX30_LVDS_P2S_EN(1),
+			   PX30_LVDS_MODE_EN(0) | PX30_LVDS_P2S_EN(0));
+
+	pm_runtime_put(lvds->dev);
+}
+
+static int px30_lvds_grf_config(struct drm_encoder *encoder,
+				struct drm_display_mode *mode)
+{
+	struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
+
+	if (lvds->output != DISPLAY_OUTPUT_LVDS) {
+		DRM_DEV_ERROR(lvds->dev, "Unsupported display output %d\n",
+			      lvds->output);
+		return -EINVAL;
+	}
+
+	/* Set format */
+	return regmap_update_bits(lvds->grf, PX30_LVDS_GRF_PD_VO_CON1,
+				  PX30_LVDS_FORMAT(lvds->format),
+				  PX30_LVDS_FORMAT(lvds->format));
+}
+
+static int px30_lvds_set_vop_source(struct rockchip_lvds *lvds,
+				    struct drm_encoder *encoder)
+{
+	int vop;
+
+	vop = drm_of_encoder_active_endpoint_id(lvds->dev->of_node, encoder);
+	if (vop < 0)
+		return vop;
+
+	return regmap_update_bits(lvds->grf, PX30_LVDS_GRF_PD_VO_CON1,
+				  PX30_LVDS_VOP_SEL(1),
+				  PX30_LVDS_VOP_SEL(vop));
+}
+
+static void px30_lvds_encoder_enable(struct drm_encoder *encoder)
+{
+	struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
+	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
+	int ret;
+
+	drm_panel_prepare(lvds->panel);
+
+	ret = px30_lvds_poweron(lvds);
+	if (ret) {
+		DRM_DEV_ERROR(lvds->dev, "failed to power on LVDS: %d\n", ret);
+		drm_panel_unprepare(lvds->panel);
+		return;
+	}
+
+	ret = px30_lvds_grf_config(encoder, mode);
+	if (ret) {
+		DRM_DEV_ERROR(lvds->dev, "failed to configure LVDS: %d\n", ret);
+		drm_panel_unprepare(lvds->panel);
+		return;
+	}
+
+	ret = px30_lvds_set_vop_source(lvds, encoder);
+	if (ret) {
+		DRM_DEV_ERROR(lvds->dev, "failed to set VOP source: %d\n", ret);
+		drm_panel_unprepare(lvds->panel);
+		return;
+	}
+
+	drm_panel_enable(lvds->panel);
+}
+
+static void px30_lvds_encoder_disable(struct drm_encoder *encoder)
+{
+	struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
+
+	drm_panel_disable(lvds->panel);
+	px30_lvds_poweroff(lvds);
+	drm_panel_unprepare(lvds->panel);
+}
+
 static const
 struct drm_encoder_helper_funcs rk3288_lvds_encoder_helper_funcs = {
 	.enable = rk3288_lvds_encoder_enable,
@@ -329,6 +428,13 @@ struct drm_encoder_helper_funcs rk3288_lvds_encoder_helper_funcs = {
 	.atomic_check = rockchip_lvds_encoder_atomic_check,
 };
 
+static const
+struct drm_encoder_helper_funcs px30_lvds_encoder_helper_funcs = {
+	.enable = px30_lvds_encoder_enable,
+	.disable = px30_lvds_encoder_disable,
+	.atomic_check = rockchip_lvds_encoder_atomic_check,
+};
+
 static const struct drm_encoder_funcs rockchip_lvds_encoder_funcs = {
 	.destroy = drm_encoder_cleanup,
 };
@@ -379,16 +485,53 @@ static int rk3288_lvds_probe(struct platform_device *pdev,
 	return 0;
 }
 
+static int px30_lvds_probe(struct platform_device *pdev,
+			   struct rockchip_lvds *lvds)
+{
+	int ret;
+
+	/* MSB */
+	ret =  regmap_update_bits(lvds->grf, PX30_LVDS_GRF_PD_VO_CON1,
+				  PX30_LVDS_MSBSEL(1),
+				  PX30_LVDS_MSBSEL(1));
+	if (ret)
+		return ret;
+
+	/* PHY */
+	lvds->dphy = devm_phy_get(&pdev->dev, "dphy");
+	if (IS_ERR(lvds->dphy))
+		return PTR_ERR(lvds->dphy);
+
+	phy_init(lvds->dphy);
+	if (ret)
+		return ret;
+
+	phy_set_mode(lvds->dphy, PHY_MODE_LVDS);
+	if (ret)
+		return ret;
+
+	return phy_power_on(lvds->dphy);
+}
+
 static const struct rockchip_lvds_soc_data rk3288_lvds_data = {
 	.probe = rk3288_lvds_probe,
 	.helper_funcs = &rk3288_lvds_encoder_helper_funcs,
 };
 
+static const struct rockchip_lvds_soc_data px30_lvds_data = {
+	.probe = px30_lvds_probe,
+	.helper_funcs = &px30_lvds_encoder_helper_funcs,
+};
+
 static const struct of_device_id rockchip_lvds_dt_ids[] = {
 	{
 		.compatible = "rockchip,rk3288-lvds",
 		.data = &rk3288_lvds_data
 	},
+	{
+		.compatible = "rockchip,px30-lvds",
+		.data = &px30_lvds_data
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, rockchip_lvds_dt_ids);

drivers/gpu/drm/rockchip/rockchip_lvds.h

@@ -106,4 +106,18 @@
 #define LVDS_VESA_18				2
 #define LVDS_JEIDA_18				3
 
+#define HIWORD_UPDATE(v, h, l)  ((GENMASK(h, l) << 16) | ((v) << (l)))
+
+#define PX30_LVDS_GRF_PD_VO_CON0		0x434
+#define   PX30_LVDS_TIE_CLKS(val)		HIWORD_UPDATE(val,  8,  8)
+#define   PX30_LVDS_INVERT_CLKS(val)		HIWORD_UPDATE(val,  9,  9)
+#define   PX30_LVDS_INVERT_DCLK(val)		HIWORD_UPDATE(val,  5,  5)
+
+#define PX30_LVDS_GRF_PD_VO_CON1		0x438
+#define   PX30_LVDS_FORMAT(val)			HIWORD_UPDATE(val, 14, 13)
+#define   PX30_LVDS_MODE_EN(val)		HIWORD_UPDATE(val, 12, 12)
+#define   PX30_LVDS_MSBSEL(val)			HIWORD_UPDATE(val, 11, 11)
+#define   PX30_LVDS_P2S_EN(val)			HIWORD_UPDATE(val,  6,  6)
+#define   PX30_LVDS_VOP_SEL(val)		HIWORD_UPDATE(val,  1,  1)
+
 #endif /* _ROCKCHIP_LVDS_ */