[PATCH] mmc/sdio: utilize runtime PM to speed up SDIO card's resume process

[Fu, Zhonghui]

Leave some work of SDIO card's resume process into it's runtime resume
process to shorten system resume latency.

Signed-off-by: Zhonghui Fu <zhonghui...@linux.intel.com>
---
 drivers/mmc/core/sdio.c  |   21 ++++++++++-----------
 include/linux/mmc/host.h |    9 ++++++---
 2 files changed, 16 insertions(+), 14 deletions(-)

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index bd44ba8..fe5d3c5 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -902,6 +902,10 @@ static int mmc_sdio_suspend(struct mmc_host *host)
 
        if (!mmc_card_keep_power(host)) {
                mmc_power_off(host);
+               if (host->caps & MMC_CAP_POWER_OFF_CARD) {
+                       pm_runtime_disable(&host->card->dev);
+                       pm_runtime_set_suspended(&host->card->dev);
+               }
        } else if (host->retune_period) {
                mmc_retune_timer_stop(host);
                mmc_retune_needed(host);
@@ -924,18 +928,16 @@ static int mmc_sdio_resume(struct mmc_host *host)
 
        /* Restore power if needed */
        if (!mmc_card_keep_power(host)) {
-               mmc_power_up(host, host->card->ocr);
                /*
-                * Tell runtime PM core we just powered up the card,
-                * since it still believes the card is powered off.
                 * Note that currently runtime PM is only enabled
                 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
                 */
                if (host->caps & MMC_CAP_POWER_OFF_CARD) {
-                       pm_runtime_disable(&host->card->dev);
-                       pm_runtime_set_active(&host->card->dev);
                        pm_runtime_enable(&host->card->dev);
+                       goto out;
                }
+
+               mmc_power_up(host, host->card->ocr);
        }
 
        /* No need to reinitialize powered-resumed nonremovable cards */
@@ -953,13 +955,10 @@ static int mmc_sdio_resume(struct mmc_host *host)
                err = sdio_enable_4bit_bus(host->card);
        }
 
-       if (!err && host->sdio_irqs) {
-               if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
-                       wake_up_process(host->sdio_irq_thread);
-               else if (host->caps & MMC_CAP_SDIO_IRQ)
-                       host->ops->enable_sdio_irq(host, 1);
-       }
+       if (!err && host->sdio_irqs)
+               mmc_signal_sdio_irq(host);
 
+out:
        mmc_release_host(host);
 
        host->pm_flags &= ~MMC_PM_KEEP_POWER;
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 8dd4d29..8faaa5b 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -400,10 +400,13 @@ void mmc_request_done(struct mmc_host *, struct 
mmc_request *);
 
 static inline void mmc_signal_sdio_irq(struct mmc_host *host)
 {
-       host->ops->enable_sdio_irq(host, 0);
-       host->sdio_irq_pending = true;
-       if (host->sdio_irq_thread)
+       if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {
+               host->ops->enable_sdio_irq(host, 0);
+               host->sdio_irq_pending = true;
                wake_up_process(host->sdio_irq_thread);
+       } else if (host->caps & MMC_CAP_SDIO_IRQ) {
+               host->ops->enable_sdio_irq(host, 1);
+       }
 }
 
 void sdio_run_irqs(struct mmc_host *host);
-- 1.7.1