[DPU PATCH] drm/msm/dsi: add only dsi nodes with a valid device to list

[Abhinav Kumar]

Before adding a DSI node to the private list check if the
node has a valid device connected to it through an endpoint.

This is required in cases where the chipset supports multiple
DSI hosts but only one of them is being used.

In the current implementation even inactive nodes get added
resulting in creation of redundant connectors.

Signed-off-by: Abhinav Kumar <abhinavk at codeaurora.org>
---
 drivers/gpu/drm/msm/dsi/dsi.c      |  6 +++++-
 drivers/gpu/drm/msm/dsi/dsi.h      |  1 +
 drivers/gpu/drm/msm/dsi/dsi_host.c | 10 ++++++++++
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi.c b/drivers/gpu/drm/msm/dsi/dsi.c
index b744bcc..46a4906 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.c
+++ b/drivers/gpu/drm/msm/dsi/dsi.c
@@ -120,7 +120,11 @@ static int dsi_bind(struct device *dev, struct device *master, void *data)
 	if (IS_ERR(msm_dsi))
 		return PTR_ERR(msm_dsi);
 
-	priv->dsi[msm_dsi->id] = msm_dsi;
+	/* Add only the host which has a device attached to it */
+	if (msm_dsi_has_valid_device(msm_dsi->host)) {
+		pr_info("id = %d has valid device\n", msm_dsi->id);
+		priv->dsi[msm_dsi->id] = msm_dsi;
+	}
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
index 70d9a9a..aa198ef 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.h
+++ b/drivers/gpu/drm/msm/dsi/dsi.h
@@ -180,6 +180,7 @@ void msm_dsi_host_get_phy_clk_req(struct mipi_dsi_host *host,
 int msm_dsi_host_modeset_init(struct mipi_dsi_host *host,
 					struct drm_device *dev);
 int msm_dsi_host_init(struct msm_dsi *msm_dsi);
+bool msm_dsi_has_valid_device(struct mipi_dsi_host *host);
 int msm_dsi_runtime_suspend(struct device *dev);
 int msm_dsi_runtime_resume(struct device *dev);
 
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 2f1a278..25d65e5 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -470,6 +470,16 @@ static void dsi_bus_clk_disable(struct msm_dsi_host *msm_host)
 		clk_disable_unprepare(msm_host->bus_clks[i]);
 }
 
+bool msm_dsi_has_valid_device(struct mipi_dsi_host *host)
+{
+	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
+
+	if (msm_host->device_node)
+		return true;
+
+	return false;
+}
+
 int msm_dsi_runtime_suspend(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project