[PATCH v2 08/15] usb: dwc2: Move enter hibernation to dwc2_port_suspend() function

Artur Petrosyan
2021-04-16T12:47:57Z

This move is done to call enter hibernation handler in
"dwc2_port_suspend()" function when core receives port suspend.
Otherwise it could be confusing to enter to hibernation in
"dwc2_hcd_hub_control()" function but other power saving modes
in "dwc2_port_suspend()" function.

Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
---
Changes in v2:
- None

drivers/usb/dwc2/hcd.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index ff945c40ef8a..43a2298b7d42 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -3321,6 +3321,18 @@ int dwc2_port_suspend(struct dwc2_hsotg *hsotg, u16 windex)
"enter partial_power_down failed.\n");
break;
case DWC2_POWER_DOWN_PARAM_HIBERNATION:
+ /*
+ * Perform spin unlock and lock because in
+ * "dwc2_host_enter_hibernation()" function there is a spinlock
+ * logic which prevents servicing of any IRQ during entering
+ * hibernation.
+ */
+ spin_unlock_irqrestore(&hsotg->lock, flags);
+ ret = dwc2_enter_hibernation(hsotg, 1);
+ if (ret)
+ dev_err(hsotg->dev, "enter hibernation failed.\n");
+ spin_lock_irqsave(&hsotg->lock, flags);
+ break;
case DWC2_POWER_DOWN_PARAM_NONE:
/*
* If not hibernation nor partial power down are supported,
@@ -3650,10 +3662,8 @@ static int dwc2_hcd_hub_control(struct dwc2_hsotg *hsotg, u16 typereq,
"SetPortFeature - USB_PORT_FEAT_SUSPEND\n");
if (windex != hsotg->otg_port)
goto error;
- if (hsotg->params.power_down == DWC2_POWER_DOWN_PARAM_HIBERNATION)
- dwc2_enter_hibernation(hsotg, 1);
- else
- dwc2_port_suspend(hsotg, windex);
+ if (!hsotg->bus_suspended)
+ retval = dwc2_port_suspend(hsotg, windex);
break;

case USB_PORT_FEAT_POWER:
--
2.25.1