mmc: slot-gpio: Add support to enable irq wake on cd_irq

Add host capability MMC_CAP_CD_WAKE to enable irq wake on the card detect
irq.

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

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index d40697f..2643126 100644 (file)
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2652,8 +2652,11 @@ void mmc_stop_host(struct mmc_host *host)
        host->removed = 1;
        spin_unlock_irqrestore(&host->lock, flags);
 #endif
-       if (host->slot.cd_irq >= 0)
+       if (host->slot.cd_irq >= 0) {
+               if (host->slot.cd_wake_enabled)
+                       disable_irq_wake(host->slot.cd_irq);
                disable_irq(host->slot.cd_irq);
+       }
 
        host->rescan_disable = 1;
        cancel_delayed_work_sync(&host->detect);

diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c
index a8450a8..863f1db 100644 (file)
--- a/drivers/mmc/core/slot-gpio.c
+++ b/drivers/mmc/core/slot-gpio.c
@@ -151,6 +151,8 @@ void mmc_gpiod_request_cd_irq(struct mmc_host *host)
 
        if (irq < 0)
                host->caps |= MMC_CAP_NEEDS_POLL;
+       else if ((host->caps & MMC_CAP_CD_WAKE) && !enable_irq_wake(irq))
+               host->slot.cd_wake_enabled = true;
 }
 EXPORT_SYMBOL(mmc_gpiod_request_cd_irq);
 

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index c81380a..ebd1ceb 100644 (file)
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -185,6 +185,7 @@ struct mmc_async_req {
  */
 struct mmc_slot {
        int cd_irq;
+       bool cd_wake_enabled;
        void *handler_priv;
 };
 
@@ -275,6 +276,7 @@ struct mmc_host {
 #define MMC_CAP_DRIVER_TYPE_A  (1 << 23)       /* Host supports Driver Type A */
 #define MMC_CAP_DRIVER_TYPE_C  (1 << 24)       /* Host supports Driver Type C */
 #define MMC_CAP_DRIVER_TYPE_D  (1 << 25)       /* Host supports Driver Type D */
+#define MMC_CAP_CD_WAKE                (1 << 28)       /* Enable card detect wake */
 #define MMC_CAP_CMD_DURING_TFR (1 << 29)       /* Commands during data transfer */
 #define MMC_CAP_CMD23          (1 << 30)       /* CMD23 supported. */
 #define MMC_CAP_HW_RESET       (1 << 31)       /* Hardware reset */