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Address wake from sleep instability (#11450)

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* resolve race condition between suspend and wake in LUFA

* avoid multiple calls to suspend_power_down() / suspend_wakeup_init()

* Remove duplicate suspend_power_down_kb() call

* pause on wakeup to wait for USB state to settle

* need the repeated suspend_power_down() (that's where the sleep is)

* more efficient implementation

* fine tune the pause after sending wakeup

* speculative chibios version of pause-after-wake

* make wakeup delay configurable, and adjust value

* better location for wakeup delay
This commit is contained in:
Joshua Diamond 2021-02-01 19:12:41 -05:00 • committed by GitHub
parent 85079d6a2e
commit 9a4618b05b
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 37 additions and 5 deletions
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11
tmk_core/protocol/chibios/usb_main.c
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@ -708,6 +708,17 @@ void init_usb_driver(USBDriver *usbp) {
void restart_usb_driver(USBDriver *usbp) {
usbStop(usbp);
usbDisconnectBus(usbp);
#if USB_SUSPEND_WAKEUP_DELAY > 0
// Some hubs, kvm switches, and monitors do
// weird things, with USB device state bouncing
// around wildly on wakeup, yielding race
// conditions that can corrupt the keyboard state.
//
// Pause for a while to let things settle...
wait_ms(USB_SUSPEND_WAKEUP_DELAY);
#endif
usbStart(usbp, &usbcfg);
usbConnectBus(usbp);
}