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lufa: Fix for freeze at re/boot time problem

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Calling led_set() in ISR can cause the problem. With converter
especially, led_set() can take long time and USB can be stuck in the end.
USB-USB converter freezes occasionally when computer power up or reboot.
https://geekhack.org/index.php?topic=69169.msg2740179#msg2740179
This is also related to suspend/wakeup issue #386.
This commit is contained in:
tmk 2019-03-29 15:45:20 +09:00
parent 1e0af6809d
commit 993a9b02f7
1 changed files with 7 additions and 9 deletions
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16
tmk_core/protocol/lufa/lufa.c
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@ -697,12 +697,12 @@ static uint8_t _led_stats = 0;
__attribute__((weak))
void hook_usb_suspend_entry(void)
{
// Turn LED off to save power
// Set 0 with putting aside status before suspend and restore
// it after wakeup, then LED is updated at keyboard_task() in main loop
// Turn off LED to save power and keep its status to resotre it later.
// LED status will be updated by keyboard_task() in main loop hopefully.
_led_stats = keyboard_led_stats;
keyboard_led_stats = 0;
led_set(keyboard_led_stats);
// Calling long task here can prevent USB state transition
matrix_clear();
clear_keyboard();
@ -731,10 +731,8 @@ void hook_usb_wakeup(void)
sleep_led_disable();
#endif
// Restore LED status
// BIOS/grub won't recognize/enumerate if led_set() takes long(around 40ms?)
// Converters fall into the case and miss wakeup event(timeout to reply?) in the end.
//led_set(host_keyboard_leds());
// Instead, restore stats and update at keyboard_task() in main loop
// Restore LED status and update at keyboard_task() in main loop
keyboard_led_stats = _led_stats;
// Calling long task here can prevent USB state transition
}