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usb: dwc2: Add clock gating exiting flow by system resume

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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: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
Link: https://lore.kernel.org/r/20210413073723.BA0FEA022E@mailhost.synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Artur Petrosyan 2021-04-13 11:37:22 +04:00 committed by Greg Kroah-Hartman
parent 50fb0c128b
commit ef5e0eec47
1 changed files with 22 additions and 0 deletions
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22
drivers/usb/dwc2/hcd.c
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@ -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;