[RFC PATCH v3 0/5] rockchip: kevin: Enable edp display

[RFC PATCH v3 0/5] rockchip: kevin: Enable edp display

[Jeffy Chen]

Make edp display works on chromebook kevin(at least for boot animation).

Also solve some issues i meet during the bringup.

Changes in v3:
Assign orphan pwms to dummy pwmchip instead of adding device link in the
customer driver.

Changes in v2:
Use device link to correct the suspend/resume and shutdown ordering,
instead of converting rockchip spi's suspend/resume PM callbacks to
late suspend/resume PM callbacks.

Jeffy Chen (4):
  arm64: dts: rockchip: Enable edp disaplay on kevin
  drm/rockchip: Fix error handling path in rockchip_dp_bind()
  pwm: Add dummy pwmchip for orphan pwms
  drm/rockchip: Add device links for master and components

Tomasz Figa (1):
  drm/bridge/analogix: Do not use device's drvdata

 arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts  | 29 ++++++++
 arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi       | 16 +++++
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 50 ++++++-------
 drivers/gpu/drm/exynos/exynos_dp.c                 | 26 ++++---
 drivers/gpu/drm/rockchip/analogix_dp-rockchip.c    | 57 +++++++++------
 drivers/gpu/drm/rockchip/rockchip_drm_drv.c        | 24 ++++++-
 drivers/pwm/core.c                                 | 84 ++++++++++++++++++++--
 include/drm/bridge/analogix_dp.h                   | 19 ++---
 8 files changed, 226 insertions(+), 79 deletions(-)

-- 
2.11.0

[RFC PATCH v3 1/5] arm64: dts: rockchip: Enable edp disaplay on kevin

[Jeffy Chen]

Add edp panel and enable related nodes on kevin.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Reviewed-by: Mark Yao <mark.yao@rock-chips.com>

---

Changes in v3: None
Changes in v2: None

 arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts | 29 +++++++++++++++++++++++
 arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi      | 16 +++++++++++++
 2 files changed, 45 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts b/arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts
index a3d3cea7dc4f..bc67b19f0af5 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts
@@ -93,6 +93,18 @@
 		pwm-delay-us = <10000>;
 	};
 
+	edp_panel: edp-panel {
+		compatible = "sharp,lq123p1jx31", "simple-panel";
+		backlight = <&backlight>;
+		power-supply = <&pp3300_disp>;
+
+		ports {
+			panel_in_edp: endpoint {
+				remote-endpoint = <&edp_out_panel>;
+			};
+		};
+	};
+
 	thermistor_ppvar_bigcpu: thermistor-ppvar-bigcpu {
 		compatible = "murata,ncp15wb473";
 		pullup-uv = <1800000>;
@@ -264,6 +276,23 @@ ap_i2c_dig: &i2c2 {
 	};
 };
 
+&edp {
+	status = "okay";
+
+	ports {
+		edp_out: port at 1 {
+			reg = <1>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			edp_out_panel: endpoint at 0 {
+				reg = <0>;
+				remote-endpoint = <&panel_in_edp>;
+			};
+		};
+	};
+};
+
 &ppvar_bigcpu_pwm {
 	regulator-min-microvolt = <798674>;
 	regulator-max-microvolt = <1302172>;
diff --git a/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi
index 5772c52fbfd3..470105d651c2 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi
@@ -927,6 +927,22 @@ ap_i2c_audio: &i2c8 {
 	dr_mode = "host";
 };
 
+&vopb {
+	status = "okay";
+};
+
+&vopb_mmu {
+	status = "okay";
+};
+
+&vopl {
+	status = "okay";
+};
+
+&vopl_mmu {
+	status = "okay";
+};
+
 #include <arm/cros-ec-keyboard.dtsi>
 #include <arm/cros-ec-sbs.dtsi>
 
-- 
2.11.0

[RFC PATCH v3 2/5] drm/rockchip: Fix error handling path in rockchip_dp_bind()

[Jeffy Chen]

Add missing error handling in rockchip_dp_bind().

Fixes: 9e32e16e9e98 ("drm: rockchip: dp: add rockchip platform dp driver")
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
---

Changes in v3: None
Changes in v2: None

 drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index 4d3f6ad0abdd..cb8941e8bcdd 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -371,7 +371,7 @@ static int rockchip_dp_bind(struct device *dev, struct device *master,
 	ret = rockchip_dp_drm_create_encoder(dp);
 	if (ret) {
 		DRM_ERROR("failed to create drm encoder\n");
-		return ret;
+		goto err_deinit_dp;
 	}
 
 	dp->plat_data.encoder = &dp->encoder;
@@ -387,7 +387,17 @@ static int rockchip_dp_bind(struct device *dev, struct device *master,
 
 	rockchip_drm_psr_register(&dp->encoder, analogix_dp_psr_set);
 
-	return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
+	ret = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
+	if (ret < 0)
+		goto err_unreg_psr;
+	return 0;
+
+err_unreg_psr:
+	rockchip_drm_psr_unregister(&dp->encoder);
+	rockchip_dp_drm_encoder_destroy(&dp->encoder);
+err_deinit_dp:
+	clk_disable_unprepare(dp->pclk);
+	return ret;
 }
 
 static void rockchip_dp_unbind(struct device *dev, struct device *master,
-- 
2.11.0

[RFC PATCH v3 3/5] drm/bridge/analogix: Do not use device's drvdata

[Jeffy Chen]

From: Tomasz Figa <tfiga@chromium.org>

The driver that instantiates the bridge should own the drvdata, as all
driver model callbacks (probe, remove, shutdown, PM ops, etc.) are also
owned by its driver struct. Moreover, storing two different pointer
types in driver data depending on driver initialization status is barely
a good practice and in fact has led to many bugs in this driver.

Let's clean up this mess and change Analogix entry points to simply
accept some opaque struct pointer, adjusting their users at the same
time to avoid breaking the compilation.

Signed-off-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
---

Changes in v3: None
Changes in v2: None

 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 50 +++++++++-------------
 drivers/gpu/drm/exynos/exynos_dp.c                 | 26 ++++++-----
 drivers/gpu/drm/rockchip/analogix_dp-rockchip.c    | 47 +++++++++++---------
 include/drm/bridge/analogix_dp.h                   | 19 ++++----
 4 files changed, 73 insertions(+), 69 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 5dd3f1cd074a..74d274b6d31d 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -98,17 +98,15 @@ static int analogix_dp_detect_hpd(struct analogix_dp_device *dp)
 	return 0;
 }
 
-int analogix_dp_psr_supported(struct device *dev)
+int analogix_dp_psr_supported(struct analogix_dp_device *dp)
 {
-	struct analogix_dp_device *dp = dev_get_drvdata(dev);
 
 	return dp->psr_support;
 }
 EXPORT_SYMBOL_GPL(analogix_dp_psr_supported);
 
-int analogix_dp_enable_psr(struct device *dev)
+int analogix_dp_enable_psr(struct analogix_dp_device *dp)
 {
-	struct analogix_dp_device *dp = dev_get_drvdata(dev);
 	struct edp_vsc_psr psr_vsc;
 
 	if (!dp->psr_support)
@@ -129,9 +127,8 @@ int analogix_dp_enable_psr(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(analogix_dp_enable_psr);
 
-int analogix_dp_disable_psr(struct device *dev)
+int analogix_dp_disable_psr(struct analogix_dp_device *dp)
 {
-	struct analogix_dp_device *dp = dev_get_drvdata(dev);
 	struct edp_vsc_psr psr_vsc;
 	int ret;
 
@@ -1281,8 +1278,9 @@ static ssize_t analogix_dpaux_transfer(struct drm_dp_aux *aux,
 	return analogix_dp_transfer(dp, msg);
 }
 
-int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
-		     struct analogix_dp_plat_data *plat_data)
+struct analogix_dp_device *
+analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
+		 struct analogix_dp_plat_data *plat_data)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct analogix_dp_device *dp;
@@ -1292,14 +1290,12 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
 
 	if (!plat_data) {
 		dev_err(dev, "Invalided input plat_data\n");
-		return -EINVAL;
+		return ERR_PTR(-EINVAL);
 	}
 
 	dp = devm_kzalloc(dev, sizeof(struct analogix_dp_device), GFP_KERNEL);
 	if (!dp)
-		return -ENOMEM;
-
-	dev_set_drvdata(dev, dp);
+		return ERR_PTR(-ENOMEM);
 
 	dp->dev = &pdev->dev;
 	dp->dpms_mode = DRM_MODE_DPMS_OFF;
@@ -1316,7 +1312,7 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
 
 	ret = analogix_dp_dt_parse_pdata(dp);
 	if (ret)
-		return ret;
+		return ERR_PTR(ret);
 
 	dp->phy = devm_phy_get(dp->dev, "dp");
 	if (IS_ERR(dp->phy)) {
@@ -1330,14 +1326,14 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
 			if (ret == -ENOSYS || ret == -ENODEV)
 				dp->phy = NULL;
 			else
-				return ret;
+				return ERR_PTR(ret);
 		}
 	}
 
 	dp->clock = devm_clk_get(&pdev->dev, "dp");
 	if (IS_ERR(dp->clock)) {
 		dev_err(&pdev->dev, "failed to get clock\n");
-		return PTR_ERR(dp->clock);
+		return ERR_CAST(dp->clock);
 	}
 
 	clk_prepare_enable(dp->clock);
@@ -1346,7 +1342,7 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
 
 	dp->reg_base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(dp->reg_base))
-		return PTR_ERR(dp->reg_base);
+		return ERR_CAST(dp->reg_base);
 
 	dp->force_hpd = of_property_read_bool(dev->of_node, "force-hpd");
 
@@ -1367,7 +1363,7 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
 					    "hpd_gpio");
 		if (ret) {
 			dev_err(&pdev->dev, "failed to get hpd gpio\n");
-			return ret;
+			return ERR_PTR(ret);
 		}
 		dp->irq = gpio_to_irq(dp->hpd_gpio);
 		irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
@@ -1379,7 +1375,7 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
 
 	if (dp->irq == -ENXIO) {
 		dev_err(&pdev->dev, "failed to get irq\n");
-		return -ENODEV;
+		return ERR_PTR(-ENODEV);
 	}
 
 	pm_runtime_enable(dev);
@@ -1420,7 +1416,7 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
 	phy_power_off(dp->phy);
 	pm_runtime_put(dev);
 
-	return 0;
+	return dp;
 
 err_disable_pm_runtime:
 
@@ -1428,15 +1424,12 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
 	pm_runtime_put(dev);
 	pm_runtime_disable(dev);
 
-	return ret;
+	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(analogix_dp_bind);
 
-void analogix_dp_unbind(struct device *dev, struct device *master,
-			void *data)
+void analogix_dp_unbind(struct analogix_dp_device *dp)
 {
-	struct analogix_dp_device *dp = dev_get_drvdata(dev);
-
 	analogix_dp_bridge_disable(dp->bridge);
 	dp->connector.funcs->destroy(&dp->connector);
 	dp->encoder->funcs->destroy(dp->encoder);
@@ -1449,16 +1442,14 @@ void analogix_dp_unbind(struct device *dev, struct device *master,
 	}
 
 	drm_dp_aux_unregister(&dp->aux);
-	pm_runtime_disable(dev);
+	pm_runtime_disable(dp->dev);
 	clk_disable_unprepare(dp->clock);
 }
 EXPORT_SYMBOL_GPL(analogix_dp_unbind);
 
 #ifdef CONFIG_PM
-int analogix_dp_suspend(struct device *dev)
+int analogix_dp_suspend(struct analogix_dp_device *dp)
 {
-	struct analogix_dp_device *dp = dev_get_drvdata(dev);
-
 	clk_disable_unprepare(dp->clock);
 
 	if (dp->plat_data->panel) {
@@ -1470,9 +1461,8 @@ int analogix_dp_suspend(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(analogix_dp_suspend);
 
-int analogix_dp_resume(struct device *dev)
+int analogix_dp_resume(struct analogix_dp_device *dp)
 {
-	struct analogix_dp_device *dp = dev_get_drvdata(dev);
 	int ret;
 
 	ret = clk_prepare_enable(dp->clock);
diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
index 39629e7a80b9..f7e5b2c405ed 100644
--- a/drivers/gpu/drm/exynos/exynos_dp.c
+++ b/drivers/gpu/drm/exynos/exynos_dp.c
@@ -41,6 +41,7 @@ struct exynos_dp_device {
 	struct device              *dev;
 
 	struct videomode           vm;
+	struct analogix_dp_device *adp;
 	struct analogix_dp_plat_data plat_data;
 };
 
@@ -157,13 +158,6 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
 	struct drm_device *drm_dev = data;
 	int ret;
 
-	/*
-	 * Just like the probe function said, we don't need the
-	 * device drvrate anymore, we should leave the charge to
-	 * analogix dp driver, set the device drvdata to NULL.
-	 */
-	dev_set_drvdata(dev, NULL);
-
 	dp->dev = dev;
 	dp->drm_dev = drm_dev;
 
@@ -190,13 +184,19 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
 
 	dp->plat_data.encoder = encoder;
 
-	return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
+	dp->adp = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
+	if (IS_ERR(dp->adp))
+		return PTR_ERR(dp->adp);
+
+	return 0;
 }
 
 static void exynos_dp_unbind(struct device *dev, struct device *master,
 			     void *data)
 {
-	return analogix_dp_unbind(dev, master, data);
+	struct exynos_dp_device *dp = dev_get_drvdata(dev);
+
+	return analogix_dp_unbind(dp->adp);
 }
 
 static const struct component_ops exynos_dp_ops = {
@@ -257,12 +257,16 @@ static int exynos_dp_remove(struct platform_device *pdev)
 #ifdef CONFIG_PM
 static int exynos_dp_suspend(struct device *dev)
 {
-	return analogix_dp_suspend(dev);
+	struct exynos_dp_device *dp = dev_get_drvdata(dev);
+
+	return analogix_dp_suspend(dp->adp);
 }
 
 static int exynos_dp_resume(struct device *dev)
 {
-	return analogix_dp_resume(dev);
+	struct exynos_dp_device *dp = dev_get_drvdata(dev);
+
+	return analogix_dp_resume(dp->adp);
 }
 #endif
 
diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index cb8941e8bcdd..e8be6cbc5f3f 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -77,6 +77,7 @@ struct rockchip_dp_device {
 
 	const struct rockchip_dp_chip_data *data;
 
+	struct analogix_dp_device *adp;
 	struct analogix_dp_plat_data plat_data;
 };
 
@@ -85,7 +86,7 @@ static void analogix_dp_psr_set(struct drm_encoder *encoder, bool enabled)
 	struct rockchip_dp_device *dp = to_dp(encoder);
 	unsigned long flags;
 
-	if (!analogix_dp_psr_supported(dp->dev))
+	if (!analogix_dp_psr_supported(dp->adp))
 		return;
 
 	DRM_DEV_DEBUG(dp->dev, "%s PSR...\n", enabled ? "Entry" : "Exit");
@@ -116,9 +117,9 @@ static void analogix_dp_psr_work(struct work_struct *work)
 
 	spin_lock_irqsave(&dp->psr_lock, flags);
 	if (dp->psr_state == EDP_VSC_PSR_STATE_ACTIVE)
-		analogix_dp_enable_psr(dp->dev);
+		analogix_dp_enable_psr(dp->adp);
 	else
-		analogix_dp_disable_psr(dp->dev);
+		analogix_dp_disable_psr(dp->adp);
 	spin_unlock_irqrestore(&dp->psr_lock, flags);
 }
 
@@ -350,13 +351,6 @@ static int rockchip_dp_bind(struct device *dev, struct device *master,
 	struct drm_device *drm_dev = data;
 	int ret;
 
-	/*
-	 * Just like the probe function said, we don't need the
-	 * device drvrate anymore, we should leave the charge to
-	 * analogix dp driver, set the device drvdata to NULL.
-	 */
-	dev_set_drvdata(dev, NULL);
-
 	dp_data = of_device_get_match_data(dev);
 	if (!dp_data)
 		return -ENODEV;
@@ -387,9 +381,11 @@ static int rockchip_dp_bind(struct device *dev, struct device *master,
 
 	rockchip_drm_psr_register(&dp->encoder, analogix_dp_psr_set);
 
-	ret = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
-	if (ret < 0)
+	dp->adp = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
+	if (IS_ERR(dp->adp)) {
+		ret = PTR_ERR(dp->adp);
 		goto err_unreg_psr;
+	}
 	return 0;
 
 err_unreg_psr:
@@ -407,7 +403,7 @@ static void rockchip_dp_unbind(struct device *dev, struct device *master,
 
 	rockchip_drm_psr_unregister(&dp->encoder);
 
-	analogix_dp_unbind(dev, master, data);
+	analogix_dp_unbind(dp->adp);
 	clk_disable_unprepare(dp->pclk);
 }
 
@@ -435,11 +431,6 @@ static int rockchip_dp_probe(struct platform_device *pdev)
 
 	dp->plat_data.panel = panel;
 
-	/*
-	 * We just use the drvdata until driver run into component
-	 * add function, and then we would set drvdata to null, so
-	 * that analogix dp driver could take charge of the drvdata.
-	 */
 	platform_set_drvdata(pdev, dp);
 
 	return component_add(dev, &rockchip_dp_component_ops);
@@ -452,10 +443,26 @@ static int rockchip_dp_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int rockchip_dp_suspend(struct device *dev)
+{
+	struct rockchip_dp_device *dp = dev_get_drvdata(dev);
+
+	return analogix_dp_suspend(dp->adp);
+}
+
+static int rockchip_dp_resume(struct device *dev)
+{
+	struct rockchip_dp_device *dp = dev_get_drvdata(dev);
+
+	return analogix_dp_resume(dp->adp);
+}
+#endif
+
 static const struct dev_pm_ops rockchip_dp_pm_ops = {
 #ifdef CONFIG_PM_SLEEP
-	.suspend = analogix_dp_suspend,
-	.resume_early = analogix_dp_resume,
+	.suspend = rockchip_dp_suspend,
+	.resume_early = rockchip_dp_resume,
 #endif
 };
 
diff --git a/include/drm/bridge/analogix_dp.h b/include/drm/bridge/analogix_dp.h
index c99d6eaef1ac..5518fc75dd6e 100644
--- a/include/drm/bridge/analogix_dp.h
+++ b/include/drm/bridge/analogix_dp.h
@@ -13,6 +13,8 @@
 
 #include <drm/drm_crtc.h>
 
+struct analogix_dp_device;
+
 enum analogix_dp_devtype {
 	EXYNOS_DP,
 	RK3288_DP,
@@ -38,16 +40,17 @@ struct analogix_dp_plat_data {
 			 struct drm_connector *);
 };
 
-int analogix_dp_psr_supported(struct device *dev);
-int analogix_dp_enable_psr(struct device *dev);
-int analogix_dp_disable_psr(struct device *dev);
+int analogix_dp_psr_supported(struct analogix_dp_device *dp);
+int analogix_dp_enable_psr(struct analogix_dp_device *dp);
+int analogix_dp_disable_psr(struct analogix_dp_device *dp);
 
-int analogix_dp_resume(struct device *dev);
-int analogix_dp_suspend(struct device *dev);
+int analogix_dp_resume(struct analogix_dp_device *dp);
+int analogix_dp_suspend(struct analogix_dp_device *dp);
 
-int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
-		     struct analogix_dp_plat_data *plat_data);
-void analogix_dp_unbind(struct device *dev, struct device *master, void *data);
+struct analogix_dp_device *
+analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
+		 struct analogix_dp_plat_data *plat_data);
+void analogix_dp_unbind(struct analogix_dp_device *dp);
 
 int analogix_dp_start_crc(struct drm_connector *connector);
 int analogix_dp_stop_crc(struct drm_connector *connector);
-- 
2.11.0

[RFC PATCH v3 3/5] drm/bridge/analogix: Do not use device's drvdata

[Jingoo Han]

On Tuesday, October 17, 2017 4:09 AM, Jeffy Chen wrote:
> 
> From: Tomasz Figa <tfiga@chromium.org>
> 
> The driver that instantiates the bridge should own the drvdata, as all
> driver model callbacks (probe, remove, shutdown, PM ops, etc.) are also
> owned by its driver struct. Moreover, storing two different pointer
> types in driver data depending on driver initialization status is barely
> a good practice and in fact has led to many bugs in this driver.
> 
> Let's clean up this mess and change Analogix entry points to simply
> accept some opaque struct pointer, adjusting their users at the same
> time to avoid breaking the compilation.
> 
> Signed-off-by: Tomasz Figa <tfiga@chromium.org>
> Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
> Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>

Acked-by: Jingoo Han <jingoohan1@gmail.com>

Best regards,
Jingoo Han

> ---
> 
> Changes in v3: None
> Changes in v2: None
> 
>  drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 50 +++++++++--------
> -----
>  drivers/gpu/drm/exynos/exynos_dp.c                 | 26 ++++++-----
>  drivers/gpu/drm/rockchip/analogix_dp-rockchip.c    | 47
+++++++++++-------
> --
>  include/drm/bridge/analogix_dp.h                   | 19 ++++----
>  4 files changed, 73 insertions(+), 69 deletions(-)
> 

[RFC PATCH v3 5/5] drm/rockchip: Add device links for master and components

[Jeffy Chen]

Since we are trying to access components' resources in the master's
suspend/resume PM callbacks(e.g. panel), add device links to correct
the suspend/resume and shutdown ordering.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
---

Changes in v3: None
Changes in v2:
Use device link to correct the suspend/resume and shutdown ordering,
instead of converting rockchip spi's suspend/resume PM callbacks to
late suspend/resume PM callbacks.

 drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index 76d63de5921d..af18967f699b 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -337,6 +337,8 @@ static struct component_match *rockchip_drm_match_add(struct device *dev)
 
 			if (!d)
 				break;
+
+			device_link_add(dev, d, DL_FLAG_STATELESS);
 			component_match_add(dev, &match, compare_dev, d);
 		} while (true);
 	}
@@ -406,6 +408,7 @@ static int rockchip_drm_platform_of_probe(struct device *dev)
 static int rockchip_drm_platform_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct device_link *link;
 	struct component_match *match = NULL;
 	int ret;
 
@@ -414,16 +417,31 @@ static int rockchip_drm_platform_probe(struct platform_device *pdev)
 		return ret;
 
 	match = rockchip_drm_match_add(dev);
-	if (IS_ERR(match))
-		return PTR_ERR(match);
+	if (IS_ERR(match)) {
+		ret = PTR_ERR(match);
+		goto err_cleanup_dev_links;
+	}
 
-	return component_master_add_with_match(dev, &rockchip_drm_ops, match);
+	ret = component_master_add_with_match(dev, &rockchip_drm_ops, match);
+	if (ret < 0)
+		goto err_cleanup_dev_links;
+
+	return 0;
+err_cleanup_dev_links:
+	list_for_each_entry(link, &dev->links.consumers, s_node)
+		device_link_del(link);
+	return ret;
 }
 
 static int rockchip_drm_platform_remove(struct platform_device *pdev)
 {
+	struct device_link *link;
+
 	component_master_del(&pdev->dev, &rockchip_drm_ops);
 
+	list_for_each_entry(link, &pdev->dev.links.consumers, s_node)
+		device_link_del(link);
+
 	return 0;
 }
 
-- 
2.11.0