static void device_wakeup(struct wfx_dev *wdev)
{
+ int max_retry = 3;
+
if (!wdev->pdata.gpio_wakeup)
return;
if (gpiod_get_value_cansleep(wdev->pdata.gpio_wakeup))
return;
- gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 1);
if (wfx_api_older_than(wdev, 1, 4)) {
+ gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 1);
if (!completion_done(&wdev->hif.ctrl_ready))
usleep_range(2000, 2500);
- } else {
+ return;
+ }
+ for (;;) {
+ gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 1);
// completion.h does not provide any function to wait
// completion without consume it (a kind of
// wait_for_completion_done_timeout()). So we have to emulate
// it.
if (wait_for_completion_timeout(&wdev->hif.ctrl_ready,
- msecs_to_jiffies(2)))
+ msecs_to_jiffies(2))) {
complete(&wdev->hif.ctrl_ready);
- else
+ return;
+ } else if (max_retry-- > 0) {
+ // Older firmwares have a race in sleep/wake-up process.
+ // Redo the process is sufficient to unfreeze the
+ // chip.
dev_err(wdev->dev, "timeout while wake up chip\n");
+ gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 0);
+ usleep_range(2000, 2500);
+ } else {
+ dev_err(wdev->dev, "max wake-up retries reached\n");
+ return;
+ }
}
}