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usb: dwc2: Prevent core suspend when port connection flag is 0

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commit 93f672804b upstream.

In host mode port connection status flag is "0" when loading
the driver. After loading the driver system asserts suspend
which is handled by "_dwc2_hcd_suspend()" function. Before
the system suspend the port connection status is "0". As
result need to check the "port_connect_status" if it is "0",
then skipping entering to suspend.

Cc: <stable@vger.kernel.org> # 5.2
Fixes: 6f6d70597c ("usb: dwc2: bus suspend/resume for hosts with DWC2_POWER_DOWN_PARAM_NONE")
Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
Link: https://lore.kernel.org/r/20210326102510.BDEDEA005D@mailhost.synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Artur Petrosyan
2021-03-26 14:25:09 +04:00
committed by Greg Kroah-Hartman
parent 4e28aca967
commit 137dfed155
1 changed files with 2 additions and 1 deletions
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3
drivers/usb/dwc2/hcd.c
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@@ -4322,7 +4322,8 @@ static int _dwc2_hcd_suspend(struct usb_hcd *hcd)
if (hsotg->op_state == OTG_STATE_B_PERIPHERAL)
goto unlock;
if (hsotg->params.power_down > DWC2_POWER_DOWN_PARAM_PARTIAL)
if (hsotg->params.power_down != DWC2_POWER_DOWN_PARAM_PARTIAL ||
hsotg->flags.b.port_connect_status == 0)
goto skip_power_saving;
/*