mmc: sdhci: Handle failure of enable_irq_wake()

Now that sdhci_enable_irq_wakeups() is a local function, change it to
return whether the IRQ wakeup was successfully enabled. This is in
preparation for adding more conditions for whether IRQ wakeup is enabled.

Note it is assumed, for SDHCI devices, that suspend is more important than
wakeup, so we continue to suspend regardless.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

1 files changed, 15 insertions, 9 deletions

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 6ac4bdd7715d..cc9776d9e8f4 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2828,7 +2828,7 @@ static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
  * sdhci_disable_irq_wakeups() since it will be set by
  * sdhci_enable_card_detection() or sdhci_init().
  */
-static void sdhci_enable_irq_wakeups(struct sdhci_host *host)
+static bool sdhci_enable_irq_wakeups(struct sdhci_host *host)
 {
 	u8 val;
 	u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
@@ -2845,6 +2845,10 @@ static void sdhci_enable_irq_wakeups(struct sdhci_host *host)
 	}
 	sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
 	sdhci_writel(host, irq_val, SDHCI_INT_ENABLE);
+
+	host->irq_wake_enabled = !enable_irq_wake(host->irq);
+
+	return host->irq_wake_enabled;
 }
 
 static void sdhci_disable_irq_wakeups(struct sdhci_host *host)
@@ -2856,6 +2860,10 @@ static void sdhci_disable_irq_wakeups(struct sdhci_host *host)
 	val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
 	val &= ~mask;
 	sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
+
+	disable_irq_wake(host->irq);
+
+	host->irq_wake_enabled = false;
 }
 
 int sdhci_suspend_host(struct sdhci_host *host)
@@ -2864,15 +2872,14 @@ int sdhci_suspend_host(struct sdhci_host *host)
 
 	mmc_retune_timer_stop(host->mmc);
 
-	if (!device_may_wakeup(mmc_dev(host->mmc))) {
+	if (!device_may_wakeup(mmc_dev(host->mmc)) ||
+	    !sdhci_enable_irq_wakeups(host)) {
 		host->ier = 0;
 		sdhci_writel(host, 0, SDHCI_INT_ENABLE);
 		sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
 		free_irq(host->irq, host);
-	} else {
-		sdhci_enable_irq_wakeups(host);
-		enable_irq_wake(host->irq);
 	}
+
 	return 0;
 }
 
@@ -2900,15 +2907,14 @@ int sdhci_resume_host(struct sdhci_host *host)
 		mmiowb();
 	}
 
-	if (!device_may_wakeup(mmc_dev(host->mmc))) {
+	if (host->irq_wake_enabled) {
+		sdhci_disable_irq_wakeups(host);
+	} else {
 		ret = request_threaded_irq(host->irq, sdhci_irq,
 					   sdhci_thread_irq, IRQF_SHARED,
 					   mmc_hostname(host->mmc), host);
 		if (ret)
 			return ret;
-	} else {
-		sdhci_disable_irq_wakeups(host);
-		disable_irq_wake(host->irq);
 	}
 
 	sdhci_enable_card_detection(host);