From: Fabrice Gasnier Date: Wed, 5 Sep 2018 11:40:03 +0000 (+0200) Subject: usb: dwc2: fix a race with external vbus supply X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=41ee1ea21052583eaf5487dfa0d0c907c9667548;p=openwrt%2Fstaging%2Fblogic.git usb: dwc2: fix a race with external vbus supply There's a race with root hub resume, when using external vbus supply. Root hub gets resumed, but runtime pm autosuspend runs as external vbus supply isn't enabled. So, host never exit from power down properly. Initialize vbus external supply before, rater that after hub resume. Fixes: 531ef5ebea96 ("usb: dwc2: add support for host mode external vbus supply") Tested-by: Artur Petrosyan Acked-by: Minas Harutyunyan Signed-off-by: Fabrice Gasnier Signed-off-by: Amelie Delaunay Signed-off-by: Felipe Balbi --- diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c index 24aa5a3acf86..4fdf373db011 100644 --- a/drivers/usb/dwc2/hcd.c +++ b/drivers/usb/dwc2/hcd.c @@ -4384,6 +4384,7 @@ static int _dwc2_hcd_start(struct usb_hcd *hcd) struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); struct usb_bus *bus = hcd_to_bus(hcd); unsigned long flags; + int ret; dev_dbg(hsotg->dev, "DWC OTG HCD START\n"); @@ -4399,6 +4400,13 @@ static int _dwc2_hcd_start(struct usb_hcd *hcd) dwc2_hcd_reinit(hsotg); + /* enable external vbus supply before resuming root hub */ + spin_unlock_irqrestore(&hsotg->lock, flags); + ret = dwc2_vbus_supply_init(hsotg); + if (ret) + return ret; + spin_lock_irqsave(&hsotg->lock, flags); + /* Initialize and connect root hub if one is not already attached */ if (bus->root_hub) { dev_dbg(hsotg->dev, "DWC OTG HCD Has Root Hub\n"); @@ -4408,7 +4416,7 @@ static int _dwc2_hcd_start(struct usb_hcd *hcd) spin_unlock_irqrestore(&hsotg->lock, flags); - return dwc2_vbus_supply_init(hsotg); + return 0; } /*