mmc: core: Push common suspend|resume code into each bus_ops

By moving code from the mmc_suspend|resume_host down into each
.suspend|resume bus_ops callback, we get a more flexible solution.

Some nice side effects are that we get a better understanding of each
bus_ops suspend|resume sequence and the common code don't have to take
care of specific corner cases, especially for the SDIO case.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/core/core.c

@@ -2621,9 +2621,6 @@ int mmc_suspend_host(struct mmc_host *host)
 {
 	int err = 0;
 
-	cancel_delayed_work(&host->detect);
-	mmc_flush_scheduled_work();
-
 	mmc_bus_get(host);
 	if (host->bus_ops && !host->bus_dead) {
 		if (host->bus_ops->suspend)
@@ -2631,9 +2628,6 @@ int mmc_suspend_host(struct mmc_host *host)
 	}
 	mmc_bus_put(host);
 
-	if (!err && !mmc_card_keep_power(host))
-		mmc_power_off(host);
-
 	return err;
 }
 EXPORT_SYMBOL(mmc_suspend_host);
@@ -2644,39 +2638,20 @@ EXPORT_SYMBOL(mmc_suspend_host);
  */
 int mmc_resume_host(struct mmc_host *host)
 {
-	int err = 0;
+	int err;
 
 	mmc_bus_get(host);
 	if (host->bus_ops && !host->bus_dead) {
-		if (!mmc_card_keep_power(host)) {
-			mmc_power_up(host);
-			mmc_select_voltage(host, host->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 (mmc_card_sdio(host->card) &&
-			    (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);
-			}
-		}
 		BUG_ON(!host->bus_ops->resume);
 		err = host->bus_ops->resume(host);
-		if (err) {
+		if (err)
 			pr_warning("%s: error %d during resume "
 					    "(card was removed?)\n",
 					    mmc_hostname(host), err);
-			err = 0;
-		}
 	}
-	host->pm_flags &= ~MMC_PM_KEEP_POWER;
 	mmc_bus_put(host);
 
-	return err;
+	return 0;
 }
 EXPORT_SYMBOL(mmc_resume_host);
 

drivers/mmc/core/mmc.c

@@ -1494,6 +1494,8 @@ static int mmc_suspend(struct mmc_host *host)
 		err = mmc_deselect_cards(host);
 	host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
 
+	if (!err)
+		mmc_power_off(host);
 out:
 	mmc_release_host(host);
 	return err;
@@ -1513,6 +1515,8 @@ static int mmc_resume(struct mmc_host *host)
 	BUG_ON(!host->card);
 
 	mmc_claim_host(host);
+	mmc_power_up(host);
+	mmc_select_voltage(host, host->ocr);
 	err = mmc_init_card(host, host->ocr, host->card);
 	mmc_release_host(host);
 

drivers/mmc/core/sd.c

@@ -1075,6 +1075,8 @@ static int mmc_sd_suspend(struct mmc_host *host)
 	if (!mmc_host_is_spi(host))
 		err = mmc_deselect_cards(host);
 	host->card->state &= ~MMC_STATE_HIGHSPEED;
+	if (!err)
+		mmc_power_off(host);
 	mmc_release_host(host);
 
 	return err;
@@ -1094,6 +1096,8 @@ static int mmc_sd_resume(struct mmc_host *host)
 	BUG_ON(!host->card);
 
 	mmc_claim_host(host);
+	mmc_power_up(host);
+	mmc_select_voltage(host, host->ocr);
 	err = mmc_sd_init_card(host, host->ocr, host->card);
 	mmc_release_host(host);
 

drivers/mmc/core/sdio.c

@@ -963,6 +963,9 @@ static int mmc_sdio_suspend(struct mmc_host *host)
 		mmc_release_host(host);
 	}
 
+	if (!err && !mmc_card_keep_power(host))
+		mmc_power_off(host);
+
 	return err;
 }
 
@@ -976,6 +979,23 @@ static int mmc_sdio_resume(struct mmc_host *host)
 	/* Basic card reinitialization. */
 	mmc_claim_host(host);
 
+	/* Restore power if needed */
+	if (!mmc_card_keep_power(host)) {
+		mmc_power_up(host);
+		mmc_select_voltage(host, host->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);
+		}
+	}
+
 	/* No need to reinitialize powered-resumed nonremovable cards */
 	if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
 		sdio_reset(host);
@@ -1013,6 +1033,7 @@ static int mmc_sdio_resume(struct mmc_host *host)
 		}
 	}
 
+	host->pm_flags &= ~MMC_PM_KEEP_POWER;
 	return err;
 }