Commit 50fb0c12 authored by Artur Petrosyan's avatar Artur Petrosyan Committed by Greg Kroah-Hartman
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usb: dwc2: Add clock gating entering flow by system suspend 



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: default avatarArtur Petrosyan <Arthur.Petrosyan@synopsys.com>
Link: https://lore.kernel.org/r/20210413073716.30C13A0094@mailhost.synopsys.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 16c729f9

drivers/usb/dwc2/hcd.c

+9 −0
Original line number Diff line number Diff line
@@ -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;

	}