linux-kernel - [PATCH 5/5] drm/bridge: dw-mipi-dsi: Fix dsi registration during drm probing

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Message-Id: <20211016102232.202119-6-michael@amarulasolutions.com>
Date:   Sat, 16 Oct 2021 10:22:32 +0000
From:   Michael Trimarchi <michael@...rulasolutions.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Rob Herring <robh+dt@...nel.org>,
        Heiko Stübner <heiko@...ech.de>
Cc:     devicetree@...r.kernel.org, Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] drm/bridge: dw-mipi-dsi: Fix dsi registration during drm probing

The dsi registration is implemented in rockchip platform driver.
The attach can be called before the probe is terminated and therefore
we need to be sure that corresponding entry during attach is valid

Signed-off-by: Michael Trimarchi <michael@...rulasolutions.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c   |  8 +++++++-
 drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c | 12 ++++++++----
 include/drm/bridge/dw_mipi_dsi.h                |  2 +-
 3 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
index e44e18a0112a..44b211be15fc 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
@@ -362,8 +362,14 @@ static int dw_mipi_dsi_host_attach(struct mipi_dsi_host *host,
 		dsi->device_found = true;
 	}
 
+	/*
+	 * NOTE: the dsi registration is implemented in
+	 * platform driver, that to say dsi would be exist after
+	 * probe is terminated. The call is done before the end of probe
+	 * so we need to pass the dsi to the platform driver.
+	 */
 	if (pdata->host_ops && pdata->host_ops->attach) {
-		ret = pdata->host_ops->attach(pdata->priv_data, device);
+		ret = pdata->host_ops->attach(pdata->priv_data, device, dsi);
 		if (ret < 0)
 			return ret;
 	}
diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
index a2262bee5aa4..32ddc8642ec1 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
@@ -997,7 +997,8 @@ static const struct component_ops dw_mipi_dsi_rockchip_ops = {
 };
 
 static int dw_mipi_dsi_rockchip_host_attach(void *priv_data,
-					    struct mipi_dsi_device *device)
+					    struct mipi_dsi_device *device,
+					    struct dw_mipi_dsi *dmd)
 {
 	struct dw_mipi_dsi_rockchip *dsi = priv_data;
 	struct device *second;
@@ -1005,6 +1006,8 @@ static int dw_mipi_dsi_rockchip_host_attach(void *priv_data,
 
 	mutex_lock(&dsi->usage_mutex);
 
+	dsi->dmd = dmd;
+
 	if (dsi->usage_mode != DW_DSI_USAGE_IDLE) {
 		DRM_DEV_ERROR(dsi->dev, "dsi controller already in use\n");
 		mutex_unlock(&dsi->usage_mutex);
@@ -1280,6 +1283,7 @@ static int dw_mipi_dsi_rockchip_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
+	struct dw_mipi_dsi *dmd;
 	struct dw_mipi_dsi_rockchip *dsi;
 	struct phy_provider *phy_provider;
 	struct resource *res;
@@ -1391,9 +1395,9 @@ static int dw_mipi_dsi_rockchip_probe(struct platform_device *pdev)
 	if (IS_ERR(phy_provider))
 		return PTR_ERR(phy_provider);
 
-	dsi->dmd = dw_mipi_dsi_probe(pdev, &dsi->pdata);
-	if (IS_ERR(dsi->dmd)) {
-		ret = PTR_ERR(dsi->dmd);
+	dmd = dw_mipi_dsi_probe(pdev, &dsi->pdata);
+	if (IS_ERR(dmd)) {
+		ret = PTR_ERR(dmd);
 		if (ret != -EPROBE_DEFER)
 			DRM_DEV_ERROR(dev,
 				      "Failed to probe dw_mipi_dsi: %d\n", ret);
diff --git a/include/drm/bridge/dw_mipi_dsi.h b/include/drm/bridge/dw_mipi_dsi.h
index bda8aa7c2280..cf81f19806ad 100644
--- a/include/drm/bridge/dw_mipi_dsi.h
+++ b/include/drm/bridge/dw_mipi_dsi.h
@@ -41,7 +41,7 @@ struct dw_mipi_dsi_phy_ops {
 
 struct dw_mipi_dsi_host_ops {
 	int (*attach)(void *priv_data,
-		      struct mipi_dsi_device *dsi);
+		      struct mipi_dsi_device *dsi, struct dw_mipi_dsi *dmd);
 	int (*detach)(void *priv_data,
 		      struct mipi_dsi_device *dsi);
 };
-- 
2.25.1