Re: [PATCH v2] drm/bridge: analogix_dp: Split bind() into probe() and real bind()

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On 3/10/20 6:34 PM, Marek Szyprowski wrote:
Analogix_dp driver acquires all its resources in the ->bind() callback,
what is a bit against the component driver based approach, where the
driver initialization is split into a probe(), where all resources are
gathered, and a bind(), where all objects are created and a compound
driver is initialized.

Extract all the resource related operations to analogix_dp_probe() and
analogix_dp_remove(), then call them before/after registration of the
device components from the main Exynos DP and Rockchip DP drivers. Also
move the plat_data initialization to the probe() to make it available for
the analogix_dp_probe() function.

This fixes the multiple calls to the bind() of the DRM compound driver
when the DP PHY driver is not yet loaded/probed:

[drm] Exynos DRM: using 14400000.fimd device for DMA mapping operations
exynos-drm exynos-drm: bound 14400000.fimd (ops fimd_component_ops [exynosdrm])
exynos-drm exynos-drm: bound 14450000.mixer (ops mixer_component_ops [exynosdrm])
exynos-dp 145b0000.dp-controller: no DP phy configured
exynos-drm exynos-drm: failed to bind 145b0000.dp-controller (ops exynos_dp_ops [exynosdrm]): -517
exynos-drm exynos-drm: master bind failed: -517
...
[drm] Exynos DRM: using 14400000.fimd device for DMA mapping operations
exynos-drm exynos-drm: bound 14400000.fimd (ops hdmi_enable [exynosdrm])
exynos-drm exynos-drm: bound 14450000.mixer (ops hdmi_enable [exynosdrm])
exynos-drm exynos-drm: bound 145b0000.dp-controller (ops hdmi_enable [exynosdrm])
exynos-drm exynos-drm: bound 14530000.hdmi (ops hdmi_enable [exynosdrm])
[drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
Console: switching to colour frame buffer device 170x48
exynos-drm exynos-drm: fb0: exynosdrmfb frame buffer device
[drm] Initialized exynos 1.1.0 20180330 for exynos-drm on minor 1
...

Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>


Acked-by: Andy Yan <andy.yan@xxxxxxxxxxxxxx>

---
v2:
- moved plat_data initialization to exynos_dp_probe/rockchip_dp_probe as
   pointed by Andy Yan
---
  .../drm/bridge/analogix/analogix_dp_core.c    | 33 +++++++++++------
  drivers/gpu/drm/exynos/exynos_dp.c            | 29 ++++++++-------
  .../gpu/drm/rockchip/analogix_dp-rockchip.c   | 36 ++++++++++---------
  include/drm/bridge/analogix_dp.h              |  5 +--
  4 files changed, 61 insertions(+), 42 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 9ded2cef57dd..76736fb8ed94 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -1652,8 +1652,7 @@ static ssize_t analogix_dpaux_transfer(struct drm_dp_aux *aux,
  }
struct analogix_dp_device *
-analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
-		 struct analogix_dp_plat_data *plat_data)
+analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)
  {
  	struct platform_device *pdev = to_platform_device(dev);
  	struct analogix_dp_device *dp;
@@ -1756,22 +1755,30 @@ analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
  					irq_flags, "analogix-dp", dp);
  	if (ret) {
  		dev_err(&pdev->dev, "failed to request irq\n");
-		goto err_disable_pm_runtime;
+		return ERR_PTR(ret);
  	}
  	disable_irq(dp->irq);
+ return dp;
+}
+EXPORT_SYMBOL_GPL(analogix_dp_probe);
+
+int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev)
+{
+	int ret;
+
  	dp->drm_dev = drm_dev;
  	dp->encoder = dp->plat_data->encoder;
dp->aux.name = "DP-AUX";
  	dp->aux.transfer = analogix_dpaux_transfer;
-	dp->aux.dev = &pdev->dev;
+	dp->aux.dev = dp->dev;
ret = drm_dp_aux_register(&dp->aux);
  	if (ret)
-		return ERR_PTR(ret);
+		return ret;
- pm_runtime_enable(dev);
+	pm_runtime_enable(dp->dev);
ret = analogix_dp_create_bridge(drm_dev, dp);
  	if (ret) {
@@ -1779,13 +1786,12 @@ analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
  		goto err_disable_pm_runtime;
  	}
- return dp;
+	return 0;
err_disable_pm_runtime:
+	pm_runtime_disable(dp->dev);
- pm_runtime_disable(dev);
-
-	return ERR_PTR(ret);
+	return ret;
  }
  EXPORT_SYMBOL_GPL(analogix_dp_bind);
@@ -1802,10 +1808,15 @@ void analogix_dp_unbind(struct analogix_dp_device *dp) drm_dp_aux_unregister(&dp->aux);
  	pm_runtime_disable(dp->dev);
-	clk_disable_unprepare(dp->clock);
  }
  EXPORT_SYMBOL_GPL(analogix_dp_unbind);
+void analogix_dp_remove(struct analogix_dp_device *dp)
+{
+	clk_disable_unprepare(dp->clock);
+}
+EXPORT_SYMBOL_GPL(analogix_dp_remove);
+
  #ifdef CONFIG_PM
  int analogix_dp_suspend(struct analogix_dp_device *dp)
  {
diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
index d23d3502ca91..5ee090691390 100644
--- a/drivers/gpu/drm/exynos/exynos_dp.c
+++ b/drivers/gpu/drm/exynos/exynos_dp.c
@@ -159,15 +159,8 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
  	struct drm_device *drm_dev = data;
  	int ret;
- dp->dev = dev;
  	dp->drm_dev = drm_dev;
- dp->plat_data.dev_type = EXYNOS_DP;
-	dp->plat_data.power_on_start = exynos_dp_poweron;
-	dp->plat_data.power_off = exynos_dp_poweroff;
-	dp->plat_data.attach = exynos_dp_bridge_attach;
-	dp->plat_data.get_modes = exynos_dp_get_modes;
-
  	if (!dp->plat_data.panel && !dp->ptn_bridge) {
  		ret = exynos_dp_dt_parse_panel(dp);
  		if (ret)
@@ -185,13 +178,11 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
dp->plat_data.encoder = encoder; - dp->adp = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
-	if (IS_ERR(dp->adp)) {
+	ret = analogix_dp_bind(dp->adp, dp->drm_dev);
+	if (ret)
  		dp->encoder.funcs->destroy(&dp->encoder);
-		return PTR_ERR(dp->adp);
-	}
- return 0;
+	return ret;
  }
static void exynos_dp_unbind(struct device *dev, struct device *master,
@@ -222,6 +213,7 @@ static int exynos_dp_probe(struct platform_device *pdev)
  	if (!dp)
  		return -ENOMEM;
+ dp->dev = dev;
  	/*
  	 * We just use the drvdata until driver run into component
  	 * add function, and then we would set drvdata to null, so
@@ -247,16 +239,29 @@ static int exynos_dp_probe(struct platform_device *pdev)
/* The remote port can be either a panel or a bridge */
  	dp->plat_data.panel = panel;
+	dp->plat_data.dev_type = EXYNOS_DP;
+	dp->plat_data.power_on_start = exynos_dp_poweron;
+	dp->plat_data.power_off = exynos_dp_poweroff;
+	dp->plat_data.attach = exynos_dp_bridge_attach;
+	dp->plat_data.get_modes = exynos_dp_get_modes;
  	dp->plat_data.skip_connector = !!bridge;
+
  	dp->ptn_bridge = bridge;
out:
+	dp->adp = analogix_dp_probe(dev, &dp->plat_data);
+	if (IS_ERR(dp->adp))
+		return PTR_ERR(dp->adp);
+
  	return component_add(&pdev->dev, &exynos_dp_ops);
  }
static int exynos_dp_remove(struct platform_device *pdev)
  {
+	struct exynos_dp_device *dp = platform_get_drvdata(pdev);
+
  	component_del(&pdev->dev, &exynos_dp_ops);
+	analogix_dp_remove(dp->adp);
return 0;
  }
diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index f38f5e113c6b..ce98c08aa8b4 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -325,15 +325,9 @@ static int rockchip_dp_bind(struct device *dev, struct device *master,
  			    void *data)
  {
  	struct rockchip_dp_device *dp = dev_get_drvdata(dev);
-	const struct rockchip_dp_chip_data *dp_data;
  	struct drm_device *drm_dev = data;
  	int ret;
- dp_data = of_device_get_match_data(dev);
-	if (!dp_data)
-		return -ENODEV;
-
-	dp->data = dp_data;
  	dp->drm_dev = drm_dev;
ret = rockchip_dp_drm_create_encoder(dp);
@@ -344,16 +338,9 @@ static int rockchip_dp_bind(struct device *dev, struct device *master,
dp->plat_data.encoder = &dp->encoder; - dp->plat_data.dev_type = dp->data->chip_type;
-	dp->plat_data.power_on_start = rockchip_dp_poweron_start;
-	dp->plat_data.power_off = rockchip_dp_powerdown;
-	dp->plat_data.get_modes = rockchip_dp_get_modes;
-
-	dp->adp = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
-	if (IS_ERR(dp->adp)) {
-		ret = PTR_ERR(dp->adp);
+	ret = analogix_dp_bind(dp->adp, drm_dev);
+	if (ret)
  		goto err_cleanup_encoder;
-	}
return 0;
  err_cleanup_encoder:
@@ -368,8 +355,6 @@ static void rockchip_dp_unbind(struct device *dev, struct device *master,
analogix_dp_unbind(dp->adp);
  	dp->encoder.funcs->destroy(&dp->encoder);
-
-	dp->adp = ERR_PTR(-ENODEV);
  }
static const struct component_ops rockchip_dp_component_ops = {
@@ -380,10 +365,15 @@ static const struct component_ops rockchip_dp_component_ops = {
  static int rockchip_dp_probe(struct platform_device *pdev)
  {
  	struct device *dev = &pdev->dev;
+	const struct rockchip_dp_chip_data *dp_data;
  	struct drm_panel *panel = NULL;
  	struct rockchip_dp_device *dp;
  	int ret;
+ dp_data = of_device_get_match_data(dev);
+	if (!dp_data)
+		return -ENODEV;
+
  	ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL);
  	if (ret < 0)
  		return ret;
@@ -394,7 +384,12 @@ static int rockchip_dp_probe(struct platform_device *pdev)
dp->dev = dev;
  	dp->adp = ERR_PTR(-ENODEV);
+	dp->data = dp_data;
  	dp->plat_data.panel = panel;
+	dp->plat_data.dev_type = dp->data->chip_type;
+	dp->plat_data.power_on_start = rockchip_dp_poweron_start;
+	dp->plat_data.power_off = rockchip_dp_powerdown;
+	dp->plat_data.get_modes = rockchip_dp_get_modes;
ret = rockchip_dp_of_probe(dp);
  	if (ret < 0)
@@ -402,12 +397,19 @@ static int rockchip_dp_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, dp); + dp->adp = analogix_dp_probe(dev, &dp->plat_data);
+	if (IS_ERR(dp->adp))
+		return PTR_ERR(dp->adp);
+
  	return component_add(dev, &rockchip_dp_component_ops);
  }
static int rockchip_dp_remove(struct platform_device *pdev)
  {
+	struct rockchip_dp_device *dp = platform_get_drvdata(pdev);
+
  	component_del(&pdev->dev, &rockchip_dp_component_ops);
+	analogix_dp_remove(dp->adp);
return 0;
  }
diff --git a/include/drm/bridge/analogix_dp.h b/include/drm/bridge/analogix_dp.h
index 7aa2f93da49c..b0dcc07334a1 100644
--- a/include/drm/bridge/analogix_dp.h
+++ b/include/drm/bridge/analogix_dp.h
@@ -42,9 +42,10 @@ int analogix_dp_resume(struct analogix_dp_device *dp);
  int analogix_dp_suspend(struct analogix_dp_device *dp);
struct analogix_dp_device *
-analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
-		 struct analogix_dp_plat_data *plat_data);
+analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data);
+int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev);
  void analogix_dp_unbind(struct analogix_dp_device *dp);
+void analogix_dp_remove(struct analogix_dp_device *dp);
int analogix_dp_start_crc(struct drm_connector *connector);
  int analogix_dp_stop_crc(struct drm_connector *connector);





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