[PATCH 4.17 052/324] usb: dwc2: Fix host exit from hibernation flow.

Greg Kroah-Hartman
2018-08-23T08:41:48Z

From: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>

[ Upstream commit 22bb5cfdf13ae70c6a34508a16cfeee48f162443 ]

In case when a hub is connected to DWC2 host
auto suspend occurs and host goes to
hibernation. When any device connected to hub
host hibernation exiting incorrectly.

- Added dwc2_hcd_rem_wakeup() function call to
exit from suspend state by remote wakeup.

- Increase timeout value for port suspend bit to be set.

Acked-by: Minas Harutyunyan <hminas@synopsys.com>
Signed-off-by: Artur Petrosyan <arturp@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/usb/dwc2/hcd.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -5437,7 +5437,7 @@ int dwc2_host_enter_hibernation(struct d
dwc2_writel(hprt0, hsotg->regs + HPRT0);

/* Wait for the HPRT0.PrtSusp register field to be set */
- if (dwc2_hsotg_wait_bit_set(hsotg, HPRT0, HPRT0_SUSP, 300))
+ if (dwc2_hsotg_wait_bit_set(hsotg, HPRT0, HPRT0_SUSP, 3000))
dev_warn(hsotg->dev, "Suspend wasn't generated\n");

/*
@@ -5618,6 +5618,8 @@ int dwc2_host_exit_hibernation(struct dw
return ret;
}

+ dwc2_hcd_rem_wakeup(hsotg);
+
hsotg->hibernated = 0;
hsotg->bus_suspended = 0;
hsotg->lx_state = DWC2_L0;