diff mbox series

[v2,04/14] drm/bridge: analogix_dp: handle clock via runtime PM

Message ID 20240619182200.3752465-4-l.stach@pengutronix.de (mailing list archive)
State New
Headers show
Series [v2,01/14] drm/bridge: analogix_dp: remove unused platform power_on_end callback | expand

Commit Message

Lucas Stach June 19, 2024, 6:21 p.m. UTC 
There is no reason to enable the controller clock in driver probe, as
there is no HW initialization done in this function. Instead rely on
either runtime PM to handle the controller clock or statically enable
it in the driver bind routine, after which real hardware access is
required to work.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Tested-by: Heiko Stuebner <heiko@sntech.de> (rk3288-veyron and rk3399-gru)
---
 .../drm/bridge/analogix/analogix_dp_core.c    | 77 +++++++++++--------
 1 file changed, 44 insertions(+), 33 deletions(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index ae79802b62bb..4453d1672686 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -1651,8 +1651,6 @@  analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)
 		return ERR_CAST(dp->clock);
 	}
 
-	clk_prepare_enable(dp->clock);
-
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 
 	dp->reg_base = devm_ioremap_resource(&pdev->dev, res);
@@ -1714,6 +1712,28 @@  analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)
 }
 EXPORT_SYMBOL_GPL(analogix_dp_probe);
 
+int analogix_dp_suspend(struct analogix_dp_device *dp)
+{
+	clk_disable_unprepare(dp->clock);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(analogix_dp_suspend);
+
+int analogix_dp_resume(struct analogix_dp_device *dp)
+{
+	int ret;
+
+	ret = clk_prepare_enable(dp->clock);
+	if (ret < 0) {
+		DRM_ERROR("Failed to prepare_enable the clock clk [%d]\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(analogix_dp_resume);
+
 int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev)
 {
 	int ret;
@@ -1721,9 +1741,15 @@  int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev)
 	dp->drm_dev = drm_dev;
 	dp->encoder = dp->plat_data->encoder;
 
-	pm_runtime_use_autosuspend(dp->dev);
-	pm_runtime_set_autosuspend_delay(dp->dev, 100);
-	pm_runtime_enable(dp->dev);
+	if (IS_ENABLED(CONFIG_PM)) {
+		pm_runtime_use_autosuspend(dp->dev);
+		pm_runtime_set_autosuspend_delay(dp->dev, 100);
+		pm_runtime_enable(dp->dev);
+	} else {
+		ret = analogix_dp_resume(dp);
+		if (ret)
+			return ret;
+	}
 
 	dp->aux.name = "DP-AUX";
 	dp->aux.transfer = analogix_dpaux_transfer;
@@ -1747,8 +1773,12 @@  int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev)
 err_unregister_aux:
 	drm_dp_aux_unregister(&dp->aux);
 err_disable_pm_runtime:
-	pm_runtime_dont_use_autosuspend(dp->dev);
-	pm_runtime_disable(dp->dev);
+	if (IS_ENABLED(CONFIG_PM)) {
+		pm_runtime_dont_use_autosuspend(dp->dev);
+		pm_runtime_disable(dp->dev);
+	} else {
+		analogix_dp_suspend(dp);
+	}
 
 	return ret;
 }
@@ -1765,40 +1795,21 @@  void analogix_dp_unbind(struct analogix_dp_device *dp)
 	}
 
 	drm_dp_aux_unregister(&dp->aux);
-	pm_runtime_dont_use_autosuspend(dp->dev);
-	pm_runtime_disable(dp->dev);
+
+	if (IS_ENABLED(CONFIG_PM)) {
+		pm_runtime_dont_use_autosuspend(dp->dev);
+		pm_runtime_disable(dp->dev);
+	} else {
+		analogix_dp_suspend(dp);
+	}
 }
 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)
-{
-	clk_disable_unprepare(dp->clock);
-	return 0;
-}
-EXPORT_SYMBOL_GPL(analogix_dp_suspend);
-
-int analogix_dp_resume(struct analogix_dp_device *dp)
-{
-	int ret;
-
-	ret = clk_prepare_enable(dp->clock);
-	if (ret < 0) {
-		DRM_ERROR("Failed to prepare_enable the clock clk [%d]\n", ret);
-		return ret;
-	}
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(analogix_dp_resume);
-#endif
-
 int analogix_dp_start_crc(struct drm_connector *connector)
 {
 	struct analogix_dp_device *dp = to_dp(connector);