On 4/28/2021 3:29 PM, Felipe Balbi wrote:

Hi,

Sandeep Maheswaram [off-list ref] writes:

quoted

Avoiding phy powerdown when wakeup capable devices are connected
by checking phy_power_off flag.
Phy should be on to wake up the device from suspend using wakeup capable
devices such as keyboard and mouse.

Signed-off-by: Sandeep Maheswaram <redacted>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
---
  drivers/usb/dwc3/core.c | 7 +++++--
  1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index b6e53d8..bb414c3 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c

@@ -1738,7 +1738,7 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
  		dwc3_core_exit(dwc);
  		break;
  	case DWC3_GCTL_PRTCAP_HOST:
-		if (!PMSG_IS_AUTO(msg)) {
+		if (!PMSG_IS_AUTO(msg) && dwc->phy_power_off) {

should be able to detect this generically, no? Shouldn't
device_may_wakeup() be valid here and give you the answer you want?

I think  device_may_wakeup() gives whether the controller is wake up 
capable or not.

But we want to keep phy powered on only when some wakeup capable devices 
(eg:keyboard ,mouse ) are connected to controller.