wl12xx: prevent scheduling while suspending (WoW enabled)
When WoW is enabled, the interface will stay up and the chip will
be powered on, so we have to flush/cancel any remaining work, and
prevent the irq handler from scheduling a new work until the system
is resumed.
Add 2 new flags:
* WL1271_FLAG_SUSPENDED - the system is (about to be) suspended.
* WL1271_FLAG_PENDING_WORK - there is a pending irq work which
should be scheduled when the system is being resumed.
In order to wake-up the system while getting an irq, we initialize
the device as wakeup device, and calling pm_wakeup_event() upon
getting the interrupt (while the system is about to be suspended)
Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
diff --git a/drivers/net/wireless/wl12xx/sdio.c b/drivers/net/wireless/wl12xx/sdio.c
index 5b03fd5e..41183db 100644
--- a/drivers/net/wireless/wl12xx/sdio.c
+++ b/drivers/net/wireless/wl12xx/sdio.c
@@ -82,6 +82,16 @@
complete(wl->elp_compl);
wl->elp_compl = NULL;
}
+
+ if (test_bit(WL1271_FLAG_SUSPENDED, &wl->flags)) {
+ /* don't enqueue a work right now. mark it as pending */
+ set_bit(WL1271_FLAG_PENDING_WORK, &wl->flags);
+ wl1271_debug(DEBUG_IRQ, "should not enqueue work");
+ disable_irq_nosync(wl->irq);
+ pm_wakeup_event(wl1271_sdio_wl_to_dev(wl), 0);
+ spin_unlock_irqrestore(&wl->wl_lock, flags);
+ return IRQ_HANDLED;
+ }
spin_unlock_irqrestore(&wl->wl_lock, flags);
return IRQ_WAKE_THREAD;
@@ -268,6 +278,7 @@
}
enable_irq_wake(wl->irq);
+ device_init_wakeup(wl1271_sdio_wl_to_dev(wl), 1);
disable_irq(wl->irq);
@@ -305,6 +316,7 @@
pm_runtime_get_noresume(&func->dev);
wl1271_unregister_hw(wl);
+ device_init_wakeup(wl1271_sdio_wl_to_dev(wl), 0);
disable_irq_wake(wl->irq);
free_irq(wl->irq, wl);
wl1271_free_hw(wl);
@@ -339,6 +351,9 @@
wl1271_error("error while trying to keep power");
goto out;
}
+
+ /* release host */
+ sdio_release_host(func);
}
out:
return ret;
@@ -346,6 +361,15 @@
static int wl1271_resume(struct device *dev)
{
+ struct sdio_func *func = dev_to_sdio_func(dev);
+ struct wl1271 *wl = sdio_get_drvdata(func);
+
+ wl1271_debug(DEBUG_MAC80211, "wl1271 resume");
+ if (wl->wow_enabled) {
+ /* claim back host */
+ sdio_claim_host(func);
+ }
+
return 0;
}