From: Bin Liu Date: Tue, 3 Feb 2015 17:02:10 +0000 (-0600) Subject: usb: musb: fix device hotplug behind hub X-Git-Tag: firefly_0821_release~176^2~2323^2^2 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9298b4aad37e8c6962edcdbd0b62620adb207d03;p=firefly-linux-kernel-4.4.55.git usb: musb: fix device hotplug behind hub The commit 889ad3b "usb: musb: try a race-free wakeup" breaks device hotplug enumeraitonn when the device is connected behind a hub while usb autosuspend is enabled. Adding finish_resume_work into runtime resume callback fixes the issue. Also resume root hub is required to resume the bus from runtime suspend, so move musb_host_resume_root_hub() back to its original location, where handles RESUME interrupt. Signed-off-by: Bin Liu Tested-by: Tony Lindgren Signed-off-by: Felipe Balbi --- diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index 34cce3e38c49..e6f4cbfeed97 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -567,6 +567,7 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb, musb->xceiv->otg->state = OTG_STATE_A_HOST; musb->is_active = 1; + musb_host_resume_root_hub(musb); break; case OTG_STATE_B_WAIT_ACON: musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL; @@ -2500,6 +2501,12 @@ static int musb_runtime_resume(struct device *dev) musb_restore_context(musb); first = 0; + if (musb->need_finish_resume) { + musb->need_finish_resume = 0; + schedule_delayed_work(&musb->finish_resume_work, + msecs_to_jiffies(20)); + } + return 0; } diff --git a/drivers/usb/musb/musb_virthub.c b/drivers/usb/musb/musb_virthub.c index 662de58630e9..294e159f4afe 100644 --- a/drivers/usb/musb/musb_virthub.c +++ b/drivers/usb/musb/musb_virthub.c @@ -72,7 +72,6 @@ void musb_host_finish_resume(struct work_struct *work) musb->xceiv->otg->state = OTG_STATE_A_HOST; spin_unlock_irqrestore(&musb->lock, flags); - musb_host_resume_root_hub(musb); } void musb_port_suspend(struct musb *musb, bool do_suspend)