Merge tag 'mmc-v4.5' of git://git.linaro.org/people/ulf.hansson/mmc

Pull MMC updates from Ulf Hansson:
 "MMC core:
   - Optimize boot time by detecting cards simultaneously
   - Make runtime resume default behavior for MMC/SD
   - Enable MMC/SD/SDIO devices to suspend/resume asynchronously
   - Allow more than 8 partitions per card
   - Introduce MMC_CAP2_NO_SDIO to prevent unsupported SDIO commands
   - Support the standard DT wakeup-source property
   - Fix driver strength switching for HS200 and HS400
   - Fix switch command timeout
   - Fix invalid vdd in voltage switch power cycle for SDIO

  MMC host:
   - sdhci: Restore behavior when setting VDD via external regulator
   - sdhci: A couple of changes/fixes related to the dma support
   - sdhci-tegra: Add Tegra210 support
   - sdhci-tegra: Support for UHS-I cards including tuning support
   - sdhci-of-at91: Add PM support
   - sh_mmcif: Rework dma channel handling
   - mvsdio: Delete platform data code path"

* tag 'mmc-v4.5' of git://git.linaro.org/people/ulf.hansson/mmc: (52 commits)
  mmc: dw_mmc: remove the unused quirks
  mmc: sdhci-pci: use to_pci_dev()
  mmc: cb710: use to_platform_device()
  mmc: tegra: use correct accessor for misc ctrl register
  mmc: tegra: enable UHS-I modes
  mmc: tegra: implement UHS tuning
  mmc: tegra: disable SPI_MODE_CLKEN
  mmc: tegra: implement module external clock change
  mmc: sdhci: restore behavior when setting VDD via external regulator
  mmc: It is not an error for the card to be removed while suspended
  mmc: block: Allow more than 8 partitions per card
  mmc: core: Optimize boot time by detecting cards simultaneously
  mmc: dw_mmc: use resource_size_t to store physical address
  mmc: core: fix __mmc_switch timeout caused by preempt
  mmc: usdhi6rol0: handle NULL data in timeout
  mmc: of_mmc_spi: Add IRQF_ONESHOT to interrupt flags
  mmc: mediatek: change some dev_err to dev_dbg
  mmc: enable MMC/SD/SDIO device to suspend/resume asynchronously
  mmc: sdhci: Fix sdhci_runtime_pm_bus_on/off()
  mmc: sdhci: 64-bit DMA actually has 4-byte alignment
  ...

1 files changed, 43 insertions, 42 deletions

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 5ae89e48fd85..f95d41ffc766 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -55,7 +55,6 @@
  */
 #define MMC_BKOPS_MAX_TIMEOUT	(4 * 60 * 1000) /* max time to wait in ms */
 
-static struct workqueue_struct *workqueue;
 static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
 
 /*
@@ -66,21 +65,16 @@ static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
 bool use_spi_crc = 1;
 module_param(use_spi_crc, bool, 0);
 
-/*
- * Internal function. Schedule delayed work in the MMC work queue.
- */
 static int mmc_schedule_delayed_work(struct delayed_work *work,
 				     unsigned long delay)
 {
-	return queue_delayed_work(workqueue, work, delay);
-}
-
-/*
- * Internal function. Flush all scheduled work from the MMC work queue.
- */
-static void mmc_flush_scheduled_work(void)
-{
-	flush_workqueue(workqueue);
+	/*
+	 * We use the system_freezable_wq, because of two reasons.
+	 * First, it allows several works (not the same work item) to be
+	 * executed simultaneously. Second, the queue becomes frozen when
+	 * userspace becomes frozen during system PM.
+	 */
+	return queue_delayed_work(system_freezable_wq, work, delay);
 }
 
 #ifdef CONFIG_FAIL_MMC_REQUEST
@@ -1485,7 +1479,7 @@ int mmc_regulator_get_supply(struct mmc_host *mmc)
 	if (IS_ERR(mmc->supply.vmmc)) {
 		if (PTR_ERR(mmc->supply.vmmc) == -EPROBE_DEFER)
 			return -EPROBE_DEFER;
-		dev_info(dev, "No vmmc regulator found\n");
+		dev_dbg(dev, "No vmmc regulator found\n");
 	} else {
 		ret = mmc_regulator_get_ocrmask(mmc->supply.vmmc);
 		if (ret > 0)
@@ -1497,7 +1491,7 @@ int mmc_regulator_get_supply(struct mmc_host *mmc)
 	if (IS_ERR(mmc->supply.vqmmc)) {
 		if (PTR_ERR(mmc->supply.vqmmc) == -EPROBE_DEFER)
 			return -EPROBE_DEFER;
-		dev_info(dev, "No vqmmc regulator found\n");
+		dev_dbg(dev, "No vqmmc regulator found\n");
 	}
 
 	return 0;
@@ -2476,15 +2470,20 @@ static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
 	 * sdio_reset sends CMD52 to reset card.  Since we do not know
 	 * if the card is being re-initialized, just send it.  CMD52
 	 * should be ignored by SD/eMMC cards.
+	 * Skip it if we already know that we do not support SDIO commands
 	 */
-	sdio_reset(host);
+	if (!(host->caps2 & MMC_CAP2_NO_SDIO))
+		sdio_reset(host);
+
 	mmc_go_idle(host);
 
 	mmc_send_if_cond(host, host->ocr_avail);
 
 	/* Order's important: probe SDIO, then SD, then MMC */
-	if (!mmc_attach_sdio(host))
-		return 0;
+	if (!(host->caps2 & MMC_CAP2_NO_SDIO))
+		if (!mmc_attach_sdio(host))
+			return 0;
+
 	if (!mmc_attach_sd(host))
 		return 0;
 	if (!mmc_attach_mmc(host))
@@ -2498,9 +2497,6 @@ int _mmc_detect_card_removed(struct mmc_host *host)
 {
 	int ret;
 
-	if (host->caps & MMC_CAP_NONREMOVABLE)
-		return 0;
-
 	if (!host->card || mmc_card_removed(host->card))
 		return 1;
 
@@ -2536,6 +2532,9 @@ int mmc_detect_card_removed(struct mmc_host *host)
 	if (!card)
 		return 1;
 
+	if (host->caps & MMC_CAP_NONREMOVABLE)
+		return 0;
+
 	ret = mmc_card_removed(card);
 	/*
 	 * The card will be considered unchanged unless we have been asked to
@@ -2567,11 +2566,6 @@ void mmc_rescan(struct work_struct *work)
 		container_of(work, struct mmc_host, detect.work);
 	int i;
 
-	if (host->trigger_card_event && host->ops->card_event) {
-		host->ops->card_event(host);
-		host->trigger_card_event = false;
-	}
-
 	if (host->rescan_disable)
 		return;
 
@@ -2580,6 +2574,13 @@ void mmc_rescan(struct work_struct *work)
 		return;
 	host->rescan_entered = 1;
 
+	if (host->trigger_card_event && host->ops->card_event) {
+		mmc_claim_host(host);
+		host->ops->card_event(host);
+		mmc_release_host(host);
+		host->trigger_card_event = false;
+	}
+
 	mmc_bus_get(host);
 
 	/*
@@ -2611,15 +2612,14 @@ void mmc_rescan(struct work_struct *work)
 	 */
 	mmc_bus_put(host);
 
+	mmc_claim_host(host);
 	if (!(host->caps & MMC_CAP_NONREMOVABLE) && host->ops->get_cd &&
 			host->ops->get_cd(host) == 0) {
-		mmc_claim_host(host);
 		mmc_power_off(host);
 		mmc_release_host(host);
 		goto out;
 	}
 
-	mmc_claim_host(host);
 	for (i = 0; i < ARRAY_SIZE(freqs); i++) {
 		if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min)))
 			break;
@@ -2663,7 +2663,6 @@ void mmc_stop_host(struct mmc_host *host)
 
 	host->rescan_disable = 1;
 	cancel_delayed_work_sync(&host->detect);
-	mmc_flush_scheduled_work();
 
 	/* clear pm flags now and let card drivers set them as needed */
 	host->pm_flags = 0;
@@ -2759,14 +2758,13 @@ int mmc_flush_cache(struct mmc_card *card)
 }
 EXPORT_SYMBOL(mmc_flush_cache);
 
-#ifdef CONFIG_PM
-
+#ifdef CONFIG_PM_SLEEP
 /* Do the card removal on suspend if card is assumed removeable
  * Do that in pm notifier while userspace isn't yet frozen, so we will be able
    to sync the card.
 */
-int mmc_pm_notify(struct notifier_block *notify_block,
-					unsigned long mode, void *unused)
+static int mmc_pm_notify(struct notifier_block *notify_block,
+			unsigned long mode, void *unused)
 {
 	struct mmc_host *host = container_of(
 		notify_block, struct mmc_host, pm_notify);
@@ -2813,6 +2811,17 @@ int mmc_pm_notify(struct notifier_block *notify_block,
 
 	return 0;
 }
+
+void mmc_register_pm_notifier(struct mmc_host *host)
+{
+	host->pm_notify.notifier_call = mmc_pm_notify;
+	register_pm_notifier(&host->pm_notify);
+}
+
+void mmc_unregister_pm_notifier(struct mmc_host *host)
+{
+	unregister_pm_notifier(&host->pm_notify);
+}
 #endif
 
 /**
@@ -2836,13 +2845,9 @@ static int __init mmc_init(void)
 {
 	int ret;
 
-	workqueue = alloc_ordered_workqueue("kmmcd", 0);
-	if (!workqueue)
-		return -ENOMEM;
-
 	ret = mmc_register_bus();
 	if (ret)
-		goto destroy_workqueue;
+		return ret;
 
 	ret = mmc_register_host_class();
 	if (ret)
@@ -2858,9 +2863,6 @@ unregister_host_class:
 	mmc_unregister_host_class();
 unregister_bus:
 	mmc_unregister_bus();
-destroy_workqueue:
-	destroy_workqueue(workqueue);
-
 	return ret;
 }
 
@@ -2869,7 +2871,6 @@ static void __exit mmc_exit(void)
 	sdio_unregister_bus();
 	mmc_unregister_host_class();
 	mmc_unregister_bus();
-	destroy_workqueue(workqueue);
 }
 
 subsys_initcall(mmc_init);