net: ipa: use autosuspend

Use runtime power management autosuspend.

Up until this point, we only suspended the IPA hardware for system
suspend; now we'll suspend it aggressively using runtime power
management, setting the initial autosuspend delay to half a second
of inactivity.

Replace pm_runtime_put() calls with pm_runtime_put_autosuspend(),
call pm_runtime_mark_last_busy() before each of those.  In places
where we're shutting things down, or decrementing power references
for errors, use pm_runtime_put_noidle() instead.

Finally, remove ipa_runtime_idle(), so the ->runtime_suspend
callback will occur if idle.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/net/ipa/ipa_smp2p.c b/drivers/net/ipa/ipa_smp2p.c
index f6e2061cd391..7e1cef0fc67c 100644
--- a/drivers/net/ipa/ipa_smp2p.c
+++ b/drivers/net/ipa/ipa_smp2p.c
@@ -174,7 +174,8 @@ static irqreturn_t ipa_smp2p_modem_setup_ready_isr(int irq, void *dev_id)
 	WARN(ret != 0, "error %d from ipa_setup()\n", ret);
 
 out_power_put:
-	(void)pm_runtime_put(dev);
+	pm_runtime_mark_last_busy(dev);
+	(void)pm_runtime_put_autosuspend(dev);
 out_mutex_unlock:
 	mutex_unlock(&smp2p->mutex);
 
@@ -211,10 +212,13 @@ static void ipa_smp2p_irq_exit(struct ipa_smp2p *smp2p, u32 irq)
 /* Drop the clock reference if it was taken in ipa_smp2p_notify() */
 static void ipa_smp2p_clock_release(struct ipa *ipa)
 {
+	struct device *dev = &ipa->pdev->dev;
+
 	if (!ipa->smp2p->clock_on)
 		return;
 
-	(void)pm_runtime_put(&ipa->pdev->dev);
+	pm_runtime_mark_last_busy(dev);
+	(void)pm_runtime_put_autosuspend(dev);
 	ipa->smp2p->clock_on = false;
 }