Commit 689bf72c6e0d ("usb: dwc3: Don't reinitialize core during
host bus-suspend/resume") updated suspend/resume routines to not
power_off and reinit PHYs/core for host mode.
It broke platforms that rely on DWC3 core to power_off PHYs to
enter low power state on system suspend.
Perform dwc3_core_exit/init only during host mode system_suspend/
resume to addresses power regression from above mentioned patch
and also allow USB session to stay connected across
runtime_suspend/resume in host mode.
Fixes: 689bf72c6e0d ("usb: dwc3: Don't reinitialize core during host
bus-suspend/resume")
Signed-off-by: Manu Gautam <mgau...@codeaurora.org>
---
drivers/usb/dwc3/core.c | 23 +++++++++++++++--------
1 file changed, 15 insertions(+), 8 deletions(-)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 0783250..e9fbee9 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1279,7 +1279,7 @@ static int dwc3_remove(struct platform_device *pdev)
}
#ifdef CONFIG_PM
-static int dwc3_suspend_common(struct dwc3 *dwc)
+static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
{
unsigned long flags;
@@ -1292,14 +1292,16 @@ static int dwc3_suspend_common(struct dwc3 *dwc)
break;
case DWC3_GCTL_PRTCAP_HOST:
default:
- /* do nothing */
+ /* do nothing during host runtime_suspend */
+ if (!PMSG_IS_AUTO(msg))
+ dwc3_core_exit(dwc);
break;
}
return 0;
}
-static int dwc3_resume_common(struct dwc3 *dwc)
+static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
{
unsigned long flags;
int ret;
@@ -1316,7 +1318,12 @@ static int dwc3_resume_common(struct dwc3 *dwc)
break;
case DWC3_GCTL_PRTCAP_HOST:
default:
- /* do nothing */
+ /* nothing to do on host runtime_resume */
+ if (!PMSG_IS_AUTO(msg)) {
+ ret = dwc3_core_init(dwc);
+ if (ret)
+ return ret;
+ }
break;
}
@@ -1348,7 +1355,7 @@ static int dwc3_runtime_suspend(struct device *dev)
if (dwc3_runtime_checks(dwc))
return -EBUSY;
- ret = dwc3_suspend_common(dwc);
+ ret = dwc3_suspend_common(dwc, PMSG_AUTO_SUSPEND);
if (ret)
return ret;
@@ -1364,7 +1371,7 @@ static int dwc3_runtime_resume(struct device *dev)
device_init_wakeup(dev, false);
- ret = dwc3_resume_common(dwc);
+ ret = dwc3_resume_common(dwc, PMSG_AUTO_RESUME);
if (ret)
return ret;
@@ -1411,7 +1418,7 @@ static int dwc3_suspend(struct device *dev)
struct dwc3 *dwc = dev_get_drvdata(dev);
int ret;
- ret = dwc3_suspend_common(dwc);
+ ret = dwc3_suspend_common(dwc, PMSG_SUSPEND);
if (ret)
return ret;
@@ -1427,7 +1434,7 @@ static int dwc3_resume(struct device *dev)
pinctrl_pm_select_default_state(dev);
- ret = dwc3_resume_common(dwc);
+ ret = dwc3_resume_common(dwc, PMSG_RESUME);
if (ret)
return ret;
--
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a Linux Foundation Collaborative Project
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