[PATCH 6/7] drm/msm/dsi: parse vsync source from device tree

[Dmitry Baryshkov <dmitry.baryshkov@linaro.org>]

Allow board's device tree to specify the vsync source (aka TE source).
If the property is omitted, the display controller driver will use the
default setting.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/dsi/dsi.h         |  1 +
 drivers/gpu/drm/msm/dsi/dsi_host.c    | 11 +++++++++++
 drivers/gpu/drm/msm/dsi/dsi_manager.c |  5 +++++
 drivers/gpu/drm/msm/msm_drv.h         |  6 ++++++
 4 files changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
index afc290408ba4..87496db203d6 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.h
+++ b/drivers/gpu/drm/msm/dsi/dsi.h
@@ -37,6 +37,7 @@ struct msm_dsi {
 
 	struct mipi_dsi_host *host;
 	struct msm_dsi_phy *phy;
+	const char *te_source;
 
 	struct drm_bridge *next_bridge;
 
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index c4d72562c95a..c26ad0fed54d 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -1786,9 +1786,11 @@ static int dsi_populate_dsc_params(struct msm_dsi_host *msm_host, struct drm_dsc
 
 static int dsi_host_parse_dt(struct msm_dsi_host *msm_host)
 {
+	struct msm_dsi *msm_dsi = platform_get_drvdata(msm_host->pdev);
 	struct device *dev = &msm_host->pdev->dev;
 	struct device_node *np = dev->of_node;
 	struct device_node *endpoint;
+	const char *te_source;
 	int ret = 0;
 
 	/*
@@ -1811,6 +1813,15 @@ static int dsi_host_parse_dt(struct msm_dsi_host *msm_host)
 		goto err;
 	}
 
+	ret = of_property_read_string(endpoint, "qcom,te-source", &te_source);
+	if (ret && ret != -EINVAL) {
+		DRM_DEV_ERROR(dev, "%s: invalid TE source configuration %d\n",
+			__func__, ret);
+		goto err;
+	}
+	if (!ret)
+		msm_dsi->te_source = devm_kstrdup(dev, te_source, GFP_KERNEL);
+
 	if (of_property_read_bool(np, "syscon-sfpb")) {
 		msm_host->sfpb = syscon_regmap_lookup_by_phandle(np,
 					"syscon-sfpb");
diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
index 5b3f3068fd92..a210b7c9e5ca 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
@@ -603,3 +603,8 @@ bool msm_dsi_is_master_dsi(struct msm_dsi *msm_dsi)
 {
 	return IS_MASTER_DSI_LINK(msm_dsi->id);
 }
+
+const char *msm_dsi_get_te_source(struct msm_dsi *msm_dsi)
+{
+	return msm_dsi->te_source;
+}
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 912ebaa5df84..afd98dffea99 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -330,6 +330,7 @@ bool msm_dsi_is_bonded_dsi(struct msm_dsi *msm_dsi);
 bool msm_dsi_is_master_dsi(struct msm_dsi *msm_dsi);
 bool msm_dsi_wide_bus_enabled(struct msm_dsi *msm_dsi);
 struct drm_dsc_config *msm_dsi_get_dsc_config(struct msm_dsi *msm_dsi);
+const char *msm_dsi_get_te_source(struct msm_dsi *msm_dsi);
 #else
 static inline void __init msm_dsi_register(void)
 {
@@ -367,6 +368,11 @@ static inline struct drm_dsc_config *msm_dsi_get_dsc_config(struct msm_dsi *msm_
 {
 	return NULL;
 }
+
+static inline const char *msm_dsi_get_te_source(struct msm_dsi *msm_dsi)
+{
+	return NULL;
+}
 #endif
 
 #ifdef CONFIG_DRM_MSM_DP

-- 
2.39.2