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usb: dwc2: Add clock gating entering flow by system suspend

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If not hibernation nor partial power down are supported,
clock gating is used to save power.

Adds a new flow of entering clock gating when PC is
suspended.

Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
Link: https://lore.kernel.org/r/20210413073716.30C13A0094@mailhost.synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Artur Petrosyan 2021-04-13 11:37:15 +04:00 committed by Greg Kroah-Hartman
parent 16c729f90b
commit 50fb0c128b
1 changed files with 9 additions and 0 deletions
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9
drivers/usb/dwc2/hcd.c
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@ -4372,6 +4372,15 @@ static int _dwc2_hcd_suspend(struct usb_hcd *hcd)
break;
case DWC2_POWER_DOWN_PARAM_HIBERNATION:
case DWC2_POWER_DOWN_PARAM_NONE:
/*
* If not hibernation nor partial power down are supported,
* clock gating is used to save power.
*/
dwc2_host_enter_clock_gating(hsotg);
/* After entering suspend, hardware is not accessible */
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
break;
default:
goto skip_power_saving;
}