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usb: dwc3: Dont release wakeup source during usb restart

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When changing USB speed via sysfs, the device might utilize the
idle time between DISCONNECT and CONNECT events and enter suspend.
As a result the pending CONNECT might get delayed thus pushing USB
enumeration during the next resume. Avoid this by not releasing the
wakeup source when usb restart is in progress.

Change-Id: I754b76eb7b36923a2dcd4d58587101750d1cd83c
Signed-off-by: Elson Roy Serrao <eserrao@codeaurora.org>
This commit is contained in:
Elson Roy Serrao 2021-07-27 10:11:41 -07:00
commit 980a25b5c2
1 changed files with 13 additions and 11 deletions
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24
drivers/usb/dwc3/dwc3-msm.c
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@ -3374,17 +3374,19 @@ static int dwc3_msm_suspend(struct dwc3_msm *mdwc, bool force_power_collapse,
dwc3_msm_update_bus_bw(mdwc, BUS_VOTE_NONE);
/*
* release wakeup source with timeout to defer system suspend to
* handle case where on USB cable disconnect, SUSPEND and DISCONNECT
* event is received.
*/
if (mdwc->lpm_to_suspend_delay) {
dev_dbg(mdwc->dev, "defer suspend with %d(msecs)\n",
mdwc->lpm_to_suspend_delay);
pm_wakeup_event(mdwc->dev, mdwc->lpm_to_suspend_delay);
} else {
pm_relax(mdwc->dev);
if (!mdwc->in_restart) {
/*
* release wakeup source with timeout to defer system suspend to
* handle case where on USB cable disconnect, SUSPEND and DISCONNECT
* event is received.
*/
if (mdwc->lpm_to_suspend_delay) {
dev_dbg(mdwc->dev, "defer suspend with %d(msecs)\n",
mdwc->lpm_to_suspend_delay);
pm_wakeup_event(mdwc->dev, mdwc->lpm_to_suspend_delay);
} else {
pm_relax(mdwc->dev);
}
}
atomic_set(&dwc->in_lpm, 1);