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Commit b595281e authored by Ajay Agarwal's avatar Ajay Agarwal Committed by Gerrit - the friendly Code Review server
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usb: dwc3-msm: Add support for snps SSPHY suspend in system suspend 



Currently the platforms using SNPS SSPHY do not suspend it so as
to receive SS wakeup events via pwr_event_irq. But certain
telematics platforms do not need SS wakeup in system suspend
scenario.
USB wakeup from PM suspend/hibernation is not a requirement for
automotive/telematics platforms. Use enable_wakeup parameter in
dwc3_msm_suspend call to allow SSPHY suspend to happen and also
to keep the IRQs enabled/disabled.

Change-Id: I691585e15539490e63a345fe2b3aacf182352399
Signed-off-by: default avatarAjay Agarwal <ajaya@codeaurora.org>
Signed-off-by: default avatarHarsh Agarwal <harshq@codeaurora.org>
parent 74b8a97e

drivers/usb/dwc3/dwc3-msm.c

+10 −6
Original line number Diff line number Diff line
@@ -2851,7 +2851,8 @@ static int dwc3_msm_update_bus_bw(struct dwc3_msm *mdwc, enum bus_vote bv) 
	return ret;

}



static int dwc3_msm_suspend(struct dwc3_msm *mdwc, bool force_power_collapse)

static int dwc3_msm_suspend(struct dwc3_msm *mdwc, bool force_power_collapse,

					bool enable_wakeup)

{

	int ret;

	struct dwc3 *dwc = platform_get_drvdata(mdwc->dwc3);
@@ -2944,7 +2945,8 @@ static int dwc3_msm_suspend(struct dwc3_msm *mdwc, bool force_power_collapse) 
		((mdwc->hs_phy->flags & (PHY_HSFS_MODE | PHY_LS_MODE)) &&

			!dwc3_msm_is_superspeed(mdwc)));

	can_suspend_ssphy = dwc->maximum_speed >= USB_SPEED_SUPER &&

			(!mdwc->use_pwr_event_for_wakeup || no_active_ss);

			(!mdwc->use_pwr_event_for_wakeup || no_active_ss ||

			 !enable_wakeup);

	/* Suspend SS PHY */

	if (can_suspend_ssphy) {

		if (mdwc->in_host_mode) {
@@ -3015,7 +3017,7 @@ static int dwc3_msm_suspend(struct dwc3_msm *mdwc, bool force_power_collapse) 
	 * using HS_PHY_IRQ or SS_PHY_IRQ. Hence enable wakeup only in

	 * case of host bus suspend and device bus suspend.

	 */

	if (!(mdwc->lpm_flags & MDWC3_POWER_COLLAPSE)) {

	if (!(mdwc->lpm_flags & MDWC3_POWER_COLLAPSE) && enable_wakeup) {

		if (mdwc->use_pdc_interrupts) {

			enable_usb_pdc_interrupt(mdwc, true);

		} else {
@@ -5313,7 +5315,8 @@ static int dwc3_msm_pm_suspend(struct device *dev) 
		return 0;

	}



	ret = dwc3_msm_suspend(mdwc, false);

	/* Wakeup not required for automotive/telematics platform host mode */

	ret = dwc3_msm_suspend(mdwc, false, false);

	if (!ret)

		atomic_set(&mdwc->pm_suspended, 1);
@@ -5385,8 +5388,9 @@ static int dwc3_msm_pm_freeze(struct device *dev) 
	/*

	 * Power collapse the core. Hence call dwc3_msm_suspend with

	 * 'force_power_collapse' set to 'true'.

	 * Wakeup not required for automotive/telematics platform host mode.

	 */

	ret = dwc3_msm_suspend(mdwc, true);

	ret = dwc3_msm_suspend(mdwc, true, false);

	if (!ret)

		atomic_set(&mdwc->pm_suspended, 1);
@@ -5449,7 +5453,7 @@ static int dwc3_msm_runtime_suspend(struct device *dev) 
	dev_dbg(dev, "DWC3-msm runtime suspend\n");

	dbg_event(0xFF, "RT Sus", 0);



	return dwc3_msm_suspend(mdwc, false);

	return dwc3_msm_suspend(mdwc, false, true);

}



static int dwc3_msm_runtime_resume(struct device *dev)