[RFC PATCH 1/3] drm/rockchip: lvds: add rk3568 support

[Alibek Omarov <a1ba.omarov@gmail.com>]

One of the ports of RK3568 can be configured as LVDS, re-using the DSI PHY

Signed-off-by: Alibek Omarov <a1ba.omarov@gmail.com>
---
 drivers/gpu/drm/rockchip/rockchip_lvds.c | 144 +++++++++++++++++++++--
 drivers/gpu/drm/rockchip/rockchip_lvds.h |  10 ++
 2 files changed, 147 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_lvds.c b/drivers/gpu/drm/rockchip/rockchip_lvds.c
index 5a284332ec49..5976067fb501 100644
--- a/drivers/gpu/drm/rockchip/rockchip_lvds.c
+++ b/drivers/gpu/drm/rockchip/rockchip_lvds.c
@@ -429,6 +429,90 @@ static void px30_lvds_encoder_disable(struct drm_encoder *encoder)
 	drm_panel_unprepare(lvds->panel);
 }
 
+static int rk3568_lvds_poweron(struct rockchip_lvds *lvds)
+{
+	int ret;
+
+	ret = clk_enable(lvds->pclk);
+	if (ret < 0) {
+		DRM_DEV_ERROR(lvds->dev, "failed to enable lvds pclk %d\n", ret);
+		return ret;
+	}
+
+	ret = pm_runtime_get_sync(lvds->dev);
+	if (ret < 0) {
+		DRM_DEV_ERROR(lvds->dev, "failed to get pm runtime: %d\n", ret);
+		clk_disable(lvds->pclk);
+		return ret;
+	}
+
+	/* Enable LVDS mode */
+	return regmap_update_bits(lvds->grf, RK3568_GRF_VO_CON2,
+				  RK3568_LVDS0_MODE_EN(1),
+				  RK3568_LVDS0_MODE_EN(1));
+}
+
+static void rk3568_lvds_poweroff(struct rockchip_lvds *lvds)
+{
+	regmap_update_bits(lvds->grf, RK3568_GRF_VO_CON2,
+			   RK3568_LVDS0_MODE_EN(1) | RK3568_LVDS0_P2S_EN(1),
+			   RK3568_LVDS0_MODE_EN(0) | RK3568_LVDS0_P2S_EN(0));
+
+	pm_runtime_put(lvds->dev);
+	clk_disable(lvds->pclk);
+}
+
+static int rk3568_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, RK3568_GRF_VO_CON0,
+				  RK3568_LVDS0_SELECT(3),
+				  RK3568_LVDS0_SELECT(lvds->format));
+}
+
+static void rk3568_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 = rk3568_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 = rk3568_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;
+	}
+
+	drm_panel_enable(lvds->panel);
+}
+
+static void rk3568_lvds_encoder_disable(struct drm_encoder *encoder)
+{
+	struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
+
+	drm_panel_disable(lvds->panel);
+	rk3568_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,
@@ -443,6 +527,13 @@ struct drm_encoder_helper_funcs px30_lvds_encoder_helper_funcs = {
 	.atomic_check = rockchip_lvds_encoder_atomic_check,
 };
 
+static const
+struct drm_encoder_helper_funcs rk3568_lvds_encoder_helper_funcs = {
+	.enable = rk3568_lvds_encoder_enable,
+	.disable = rk3568_lvds_encoder_disable,
+	.atomic_check = rockchip_lvds_encoder_atomic_check,
+};
+
 static int rk3288_lvds_probe(struct platform_device *pdev,
 			     struct rockchip_lvds *lvds)
 {
@@ -487,6 +578,26 @@ static int rk3288_lvds_probe(struct platform_device *pdev,
 	return 0;
 }
 
+static int rockchip_lvds_phy_probe(struct platform_device *pdev,
+				   struct rockchip_lvds *lvds)
+{
+	int ret;
+
+	lvds->dphy = devm_phy_get(&pdev->dev, "dphy");
+	if (IS_ERR(lvds->dphy))
+		return PTR_ERR(lvds->dphy);
+
+	ret = phy_init(lvds->dphy);
+	if (ret)
+		return ret;
+
+	ret = phy_set_mode(lvds->dphy, PHY_MODE_LVDS);
+	if (ret)
+		return ret;
+
+	return phy_power_on(lvds->dphy);
+}
+
 static int px30_lvds_probe(struct platform_device *pdev,
 			   struct rockchip_lvds *lvds)
 {
@@ -499,20 +610,28 @@ static int px30_lvds_probe(struct platform_device *pdev,
 	if (ret)
 		return ret;
 
-	/* PHY */
-	lvds->dphy = devm_phy_get(&pdev->dev, "dphy");
-	if (IS_ERR(lvds->dphy))
-		return PTR_ERR(lvds->dphy);
+	return rockchip_lvds_phy_probe(pdev, lvds);
+}
 
-	ret = phy_init(lvds->dphy);
+static int rk3568_lvds_probe(struct platform_device *pdev,
+			     struct rockchip_lvds *lvds)
+{
+	int ret;
+
+	ret = regmap_update_bits(lvds->grf, RK3568_GRF_VO_CON0,
+				  RK3568_LVDS0_MSBSEL(1),
+				  RK3568_LVDS0_MSBSEL(1));
 	if (ret)
 		return ret;
 
-	ret = phy_set_mode(lvds->dphy, PHY_MODE_LVDS);
+	ret = regmap_update_bits(lvds->grf, RK3568_GRF_VO_CON2,
+				 RK3568_LVDS0_P2S_EN(1),
+				 RK3568_LVDS0_P2S_EN(1));
+
 	if (ret)
 		return ret;
 
-	return phy_power_on(lvds->dphy);
+	return rockchip_lvds_phy_probe(pdev, lvds);
 }
 
 static const struct rockchip_lvds_soc_data rk3288_lvds_data = {
@@ -525,6 +644,11 @@ static const struct rockchip_lvds_soc_data px30_lvds_data = {
 	.helper_funcs = &px30_lvds_encoder_helper_funcs,
 };
 
+static const struct rockchip_lvds_soc_data rk3568_lvds_data = {
+	.probe = rk3568_lvds_probe,
+	.helper_funcs = &rk3568_lvds_encoder_helper_funcs,
+};
+
 static const struct of_device_id rockchip_lvds_dt_ids[] = {
 	{
 		.compatible = "rockchip,rk3288-lvds",
@@ -534,6 +658,10 @@ static const struct of_device_id rockchip_lvds_dt_ids[] = {
 		.compatible = "rockchip,px30-lvds",
 		.data = &px30_lvds_data
 	},
+	{
+		.compatible = "rockchip,rk3568-lvds",
+		.data = &rk3568_lvds_data
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, rockchip_lvds_dt_ids);
@@ -608,6 +736,8 @@ static int rockchip_lvds_bind(struct device *dev, struct device *master,
 	encoder = &lvds->encoder.encoder;
 	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
 							     dev->of_node);
+	rockchip_drm_encoder_set_crtc_endpoint_id(&lvds->encoder,
+						  dev->of_node, 0, 0);
 
 	ret = drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_LVDS);
 	if (ret < 0) {
diff --git a/drivers/gpu/drm/rockchip/rockchip_lvds.h b/drivers/gpu/drm/rockchip/rockchip_lvds.h
index 4ce967d23813..57decb33f779 100644
--- a/drivers/gpu/drm/rockchip/rockchip_lvds.h
+++ b/drivers/gpu/drm/rockchip/rockchip_lvds.h
@@ -120,4 +120,14 @@
 #define   PX30_LVDS_P2S_EN(val)			HIWORD_UPDATE(val,  6,  6)
 #define   PX30_LVDS_VOP_SEL(val)		HIWORD_UPDATE(val,  1,  1)
 
+#define RK3568_GRF_VO_CON0			0x0360
+#define   RK3568_LVDS0_SELECT(val)		HIWORD_UPDATE(val,  5,  4)
+#define   RK3568_LVDS0_MSBSEL(val)		HIWORD_UPDATE(val,  3,  3)
+
+#define RK3568_GRF_VO_CON2			0x0368
+#define   RK3568_LVDS0_DCLK_INV_SEL(val)	HIWORD_UPDATE(val,  9,  9)
+#define   RK3568_LVDS0_DCLK_DIV2_SEL(val)	HIWORD_UPDATE(val,  8,  8)
+#define   RK3568_LVDS0_MODE_EN(val)		HIWORD_UPDATE(val,  1,  1)
+#define   RK3568_LVDS0_P2S_EN(val)		HIWORD_UPDATE(val,  0,  0)
+
 #endif /* _ROCKCHIP_LVDS_ */
-- 
2.25.1


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