Commit ef5e0eec authored by Artur Petrosyan's avatar Artur Petrosyan Committed by Greg Kroah-Hartman
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usb: dwc2: Add clock gating exiting flow by system resume 



If not hibernation nor partial power down are supported,
port resume is done using the clock gating programming flow.

Adds a new flow of exiting clock gating when PC is
resumed.

Signed-off-by: default avatarArtur Petrosyan <Arthur.Petrosyan@synopsys.com>
Link: https://lore.kernel.org/r/20210413073723.BA0FEA022E@mailhost.synopsys.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 50fb0c12

drivers/usb/dwc2/hcd.c

+22 −0
Original line number Diff line number Diff line
@@ -4445,6 +4445,28 @@ static int _dwc2_hcd_resume(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,

		 * port resume is done using the clock gating programming flow.

		 */

		spin_unlock_irqrestore(&hsotg->lock, flags);

		dwc2_host_exit_clock_gating(hsotg, 0);



		/*

		 * Initialize the Core for Host mode, as after system resume

		 * the global interrupts are disabled.

		 */

		dwc2_core_init(hsotg, false);

		dwc2_enable_global_interrupts(hsotg);

		dwc2_hcd_reinit(hsotg);

		spin_lock_irqsave(&hsotg->lock, flags);



		/*

		 * Set HW accessible bit before powering on the controller

		 * since an interrupt may rise.

		 */

		set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);

		break;

	default:

		hsotg->lx_state = DWC2_L0;

		goto unlock;