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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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24
tmk_core/protocol/lufa/lufa.c
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@ -435,7 +435,9 @@ void EVENT_USB_Device_Suspend() {
*/
void EVENT_USB_Device_WakeUp() {
print("[W]");
#if defined(NO_USB_STARTUP_CHECK)
suspend_wakeup_init();
#endif
#ifdef SLEEP_LED_ENABLE
sleep_led_disable();
@ -1073,12 +1075,26 @@ int main(void) {
print("Keyboard start.\n");
while (1) {
#if !defined(NO_USB_STARTUP_CHECK)
while (USB_DeviceState == DEVICE_STATE_Suspended) {
if (USB_DeviceState == DEVICE_STATE_Suspended) {
print("[s]");
suspend_power_down();
if (USB_Device_RemoteWakeupEnabled && suspend_wakeup_condition()) {
USB_Device_SendRemoteWakeup();
while (USB_DeviceState == DEVICE_STATE_Suspended) {
suspend_power_down();
if (USB_Device_RemoteWakeupEnabled && suspend_wakeup_condition()) {
USB_Device_SendRemoteWakeup();
clear_keyboard();
# 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
}
}
suspend_wakeup_init();
}
#endif