This is a note to let you know that I've just added the patch titled usb: dwc2: Prevent core suspend when port connection flag is 0 to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: usb-dwc2-prevent-core-suspend-when-port-connection-flag-is-0.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 93f672804bf2d7a49ef3fd96827ea6290ca1841e Mon Sep 17 00:00:00 2001 From: Artur Petrosyan <Arthur.Petrosyan@xxxxxxxxxxxx> Date: Fri, 26 Mar 2021 14:25:09 +0400 Subject: usb: dwc2: Prevent core suspend when port connection flag is 0 From: Artur Petrosyan <Arthur.Petrosyan@xxxxxxxxxxxx> commit 93f672804bf2d7a49ef3fd96827ea6290ca1841e 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@xxxxxxxxxxxxxxx> # 5.2 Fixes: 6f6d70597c15 ("usb: dwc2: bus suspend/resume for hosts with DWC2_POWER_DOWN_PARAM_NONE") Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@xxxxxxxxxxxx> Link: https://lore.kernel.org/r/20210326102510.BDEDEA005D@xxxxxxxxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/dwc2/hcd.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/usb/dwc2/hcd.c +++ b/drivers/usb/dwc2/hcd.c @@ -4322,7 +4322,8 @@ static int _dwc2_hcd_suspend(struct usb_ 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; /* Patches currently in stable-queue which might be from Arthur.Petrosyan@xxxxxxxxxxxx are queue-5.4/usb-dwc2-fix-hprt0.prtsusp-bit-setting-for-hikey-960-board.patch queue-5.4/usb-dwc2-prevent-core-suspend-when-port-connection-flag-is-0.patch