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usb: dwc2: make hcd into L3 power off state when suspend

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The controller will reset and run into error state if turn
off power when suspend in host mode. This patch stop hcd to
make the controller into L3 state to make sure that the
controller and driver state will reset when resume.

Change-Id: If66bc1a249e919f440ecde0c66f18dabde0b2e62
Signed-off-by: Meng Dongyang <daniel.meng@rock-chips.com>
Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
This commit is contained in:
Meng Dongyang
2018-03-08 19:00:02 +08:00
committed by Frank Wang
parent 6e6adab8f7
commit f3b41537fc
1 changed files with 11 additions and 0 deletions
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11
drivers/usb/dwc2/platform.c
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@@ -699,6 +699,7 @@ static int __maybe_unused dwc2_suspend(struct device *dev)
static int __maybe_unused dwc2_resume(struct device *dev)
{
struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev);
unsigned long flags;
int ret = 0;
if (dwc2->phy_off_for_suspend && dwc2->ll_hw_enabled) {
@@ -738,6 +739,16 @@ static int __maybe_unused dwc2_resume(struct device *dev)
dwc2_drd_resume(dwc2);
/* Stop hcd if dr_mode is host and PD is power off when suspend */
if (dwc2->op_state == OTG_STATE_A_HOST && dwc2_is_device_mode(dwc2)) {
spin_lock_irqsave(&dwc2->lock, flags);
dwc2_hcd_disconnect(dwc2, true);
dwc2->lx_state = DWC2_L3;
if (!dwc2->driver)
dwc2_hsotg_core_init_disconnected(dwc2, false);
spin_unlock_irqrestore(&dwc2->lock, flags);
}
if (dwc2_is_device_mode(dwc2))
ret = dwc2_hsotg_resume(dwc2);