On 3/8/2024 8:10 AM, Thinh Nguyen wrote:
If the device is configured for system wakeup, then make sure that the xHCI driver knows about it and make sure to permit wakeup only at the appropriate time.
For host mode, if the controller goes through the dwc3 code path, then a child xHCI platform device is created. Make sure the platform device also inherits the wakeup setting for xHCI to enable remote wakeup.
For device mode, make sure to disable system wakeup if no gadget driver is bound. We may experience unwanted system wakeup due to the wakeup signal from the controller PMU detecting connection/disconnection when in low power (D3). E.g. In the case of Steam Deck, the PCI PME prevents the system staying in suspend.
We were chasing down same issue at our end and found this patch to be helpful. Tested on both host and device mode. Patch is working as expected.
Please feel free to add my tag Tested-by: Sanath S Sanath.S@amd.com
Cc: stable@vger.kernel.org Reported-by: Guilherme G. Piccoli gpiccoli@igalia.com Closes: https://lore.kernel.org/linux-usb/70a7692d-647c-9be7-00a6-06fc60f77294@igali... Fixes: d07e8819a03d ("usb: dwc3: add xHCI Host support") Signed-off-by: Thinh Nguyen Thinh.Nguyen@synopsys.com
drivers/usb/dwc3/core.c | 2 ++ drivers/usb/dwc3/core.h | 2 ++ drivers/usb/dwc3/gadget.c | 10 ++++++++++ drivers/usb/dwc3/host.c | 11 +++++++++++ 4 files changed, 25 insertions(+)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 3e55838c0001..31684cdaaae3 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -1519,6 +1519,8 @@ static void dwc3_get_properties(struct dwc3 *dwc) else dwc->sysdev = dwc->dev;
- dwc->sys_wakeup = device_may_wakeup(dwc->sysdev);
- ret = device_property_read_string(dev, "usb-psy-name", &usb_psy_name); if (ret >= 0) { dwc->usb_psy = power_supply_get_by_name(usb_psy_name);
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index e120611a5174..893b1e694efe 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -1132,6 +1132,7 @@ struct dwc3_scratchpad_array {
- 3 - Reserved
- @dis_metastability_quirk: set to disable metastability quirk.
- @dis_split_quirk: set to disable split boundary.
- @sys_wakeup: set if the device may do system wakeup.
- @wakeup_configured: set if the device is configured for remote wakeup.
- @suspended: set to track suspend event due to U3/L2.
- @imod_interval: set the interrupt moderation interval in 250ns
@@ -1355,6 +1356,7 @@ struct dwc3 { unsigned dis_split_quirk:1; unsigned async_callbacks:1;
- unsigned sys_wakeup:1; unsigned wakeup_configured:1; unsigned suspended:1;
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 28f49400f3e8..07820b1a88a2 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -2968,6 +2968,9 @@ static int dwc3_gadget_start(struct usb_gadget *g, dwc->gadget_driver = driver; spin_unlock_irqrestore(&dwc->lock, flags);
- if (dwc->sys_wakeup)
device_wakeup_enable(dwc->sysdev);- return 0; }
@@ -2983,6 +2986,9 @@ static int dwc3_gadget_stop(struct usb_gadget *g) struct dwc3 *dwc = gadget_to_dwc(g); unsigned long flags;
- if (dwc->sys_wakeup)
device_wakeup_disable(dwc->sysdev);- spin_lock_irqsave(&dwc->lock, flags); dwc->gadget_driver = NULL; dwc->max_cfg_eps = 0;
@@ -4664,6 +4670,10 @@ int dwc3_gadget_init(struct dwc3 *dwc) else dwc3_gadget_set_speed(dwc->gadget, dwc->maximum_speed);
- /* No system wakeup if no gadget driver bound */
- if (dwc->sys_wakeup)
device_wakeup_disable(dwc->sysdev);- return 0;
err5: diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c index 43230915323c..f6a020d77fa1 100644 --- a/drivers/usb/dwc3/host.c +++ b/drivers/usb/dwc3/host.c @@ -123,6 +123,14 @@ int dwc3_host_init(struct dwc3 *dwc) goto err; }
- if (dwc->sys_wakeup) {
/* Restore wakeup setting if switched from device */device_wakeup_enable(dwc->sysdev);/* Pass on wakeup setting to the new xhci platform device */device_init_wakeup(&xhci->dev, true);- }
- return 0; err: platform_device_put(xhci);
@@ -131,6 +139,9 @@ int dwc3_host_init(struct dwc3 *dwc) void dwc3_host_exit(struct dwc3 *dwc) {
- if (dwc->sys_wakeup)
device_init_wakeup(&dwc->xhci->dev, false);- platform_device_unregister(dwc->xhci); dwc->xhci = NULL; }
base-commit: b234c70fefa7532d34ebee104de64cc16f1b21e4