Merge tag 'mmc-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc

Pull MMC updates from Ulf Hansson:
 "This time, this pull request contains changes crossing subsystems and
  archs/platforms, which is mainly because of a bigger modernization of
  moving from legacy GPIO to GPIO descriptors for MMC (by Linus
  Walleij).

  Additionally, once again, I am funneling changes to
  drivers/misc/cardreader/* and drivers/memstick/* through my MMC tree,
  mostly due to that we lack a maintainer for these.

  Summary:

  MMC core:
   - Cleanup BKOPS support
   - Introduce MMC_CAP_SYNC_RUNTIME_PM
   - slot-gpio: Delete legacy slot GPIO handling

  MMC host:
   - alcor: Add new mmc host driver for Alcor Micro PCI based cardreader
   - bcm2835: Several improvements to better recover from errors
   - jz4740: Rework and fixup pre|post_req support
   - mediatek: Add support for SDIO IRQs
   - meson-gx: Improve clock phase management
   - meson-gx: Stop descriptor on errors
   - mmci: Complete the sbc error path by sending a stop command
   - renesas_sdhi/tmio: Fixup reset/resume operations
   - renesas_sdhi: Add support for r8a774c0 and R7S9210
   - renesas_sdhi: Whitelist R8A77990 SDHI
   - renesas_sdhi: Fixup eMMC HS400 compatibility issues for H3 and M3-W
   - rtsx_usb_sdmmc: Re-work card detection/removal support
   - rtsx_usb_sdmmc: Re-work runtime PM support
   - sdhci: Fix timeout loops for some variant drivers
   - sdhci: Improve support for error handling due to failing commands
   - sdhci-acpi/pci: Disable LED control for Intel BYT-based controllers
   - sdhci_am654: Add new SDHCI variant driver to support TI's AM654 SOCs
   - sdhci-of-esdhc: Add support for eMMC HS400 mode
   - sdhci-omap: Fixup reset support
   - sdhci-omap: Workaround errata regarding SDR104/HS200 tuning failures
   - sdhci-msm: Fixup sporadic write transfers issues for SDR104/HS200
   - sdhci-msm: Fixup dynamical clock gating issues
   - various: Complete converting all hosts into using slot GPIO descriptors

  Other:
   - Move GPIO mmc platform data for mips/sh/arm to GPIO descriptors
   - Add new Alcor Micro cardreader PCI driver
   - Support runtime power management for memstick rtsx_usb_ms driver
   - Use USB remote wakeups for card detection for rtsx_usb misc driver"

* tag 'mmc-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc: (99 commits)
  mmc: mediatek: Add MMC_CAP_SDIO_IRQ support
  mmc: renesas_sdhi_internal_dmac: Whitelist r8a774c0
  dt-bindings: mmc: renesas_sdhi: Add r8a774c0 support
  mmc: core: Cleanup BKOPS support
  mmc: core: Drop redundant check in mmc_send_hpi_cmd()
  mmc: sdhci-omap: Workaround errata regarding SDR104/HS200 tuning failures (i929)
  dt-bindings: sdhci-omap: Add note for cpu_thermal
  mmc: sdhci-acpi: Disable LED control for Intel BYT-based controllers
  mmc: sdhci-pci: Disable LED control for Intel BYT-based controllers
  mmc: sdhci: Add quirk to disable LED control
  mmc: mmci: add variant property to set command stop bit
  misc: alcor_pci: fix spelling mistake "invailid" -> "invalid"
  mmc: meson-gx: add signal resampling
  mmc: meson-gx: align default phase on soc vendor tree
  mmc: meson-gx: remove useless lock
  mmc: meson-gx: make sure the descriptor is stopped on errors
  mmc: sdhci_am654: Add Initial Support for AM654 SDHCI driver
  dt-bindings: mmc: sdhci-of-arasan: Add deprecated message for AM65
  dt-bindings: mmc: sdhci-am654: Document bindings for the host controllers on TI's AM654 SOCs
  mmc: sdhci-msm: avoid unused function warning
  ...

2 files changed, 107 insertions, 66 deletions

diff --git a/drivers/memstick/core/memstick.c b/drivers/memstick/core/memstick.c
index 76382c858c35..1246d69ba187 100644
--- a/drivers/memstick/core/memstick.c
+++ b/drivers/memstick/core/memstick.c
@@ -18,6 +18,7 @@
 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#include <linux/pm_runtime.h>
 
 #define DRIVER_NAME "memstick"
 
@@ -436,6 +437,7 @@ static void memstick_check(struct work_struct *work)
 	struct memstick_dev *card;
 
 	dev_dbg(&host->dev, "memstick_check started\n");
+	pm_runtime_get_noresume(host->dev.parent);
 	mutex_lock(&host->lock);
 	if (!host->card) {
 		if (memstick_power_on(host))
@@ -479,6 +481,7 @@ out_power_off:
 		host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_OFF);
 
 	mutex_unlock(&host->lock);
+	pm_runtime_put(host->dev.parent);
 	dev_dbg(&host->dev, "memstick_check finished\n");
 }
 
diff --git a/drivers/memstick/host/rtsx_usb_ms.c b/drivers/memstick/host/rtsx_usb_ms.c
index 4f64563df7de..97308dc28ccf 100644
--- a/drivers/memstick/host/rtsx_usb_ms.c
+++ b/drivers/memstick/host/rtsx_usb_ms.c
@@ -40,15 +40,14 @@ struct rtsx_usb_ms {
 
 	struct mutex		host_mutex;
 	struct work_struct	handle_req;
-
-	struct task_struct	*detect_ms;
-	struct completion	detect_ms_exit;
+	struct delayed_work	poll_card;
 
 	u8			ssc_depth;
 	unsigned int		clock;
 	int			power_mode;
 	unsigned char           ifmode;
 	bool			eject;
+	bool			system_suspending;
 };
 
 static inline struct device *ms_dev(struct rtsx_usb_ms *host)
@@ -545,7 +544,7 @@ static void rtsx_usb_ms_handle_req(struct work_struct *work)
 						host->req->error);
 			}
 		} while (!rc);
-		pm_runtime_put(ms_dev(host));
+		pm_runtime_put_sync(ms_dev(host));
 	}
 
 }
@@ -585,14 +584,14 @@ static int rtsx_usb_ms_set_param(struct memstick_host *msh,
 			break;
 
 		if (value == MEMSTICK_POWER_ON) {
-			pm_runtime_get_sync(ms_dev(host));
+			pm_runtime_get_noresume(ms_dev(host));
 			err = ms_power_on(host);
+			if (err)
+				pm_runtime_put_noidle(ms_dev(host));
 		} else if (value == MEMSTICK_POWER_OFF) {
 			err = ms_power_off(host);
-			if (host->msh->card)
+			if (!err)
 				pm_runtime_put_noidle(ms_dev(host));
-			else
-				pm_runtime_put(ms_dev(host));
 		} else
 			err = -EINVAL;
 		if (!err)
@@ -638,12 +637,16 @@ static int rtsx_usb_ms_set_param(struct memstick_host *msh,
 	}
 out:
 	mutex_unlock(&ucr->dev_mutex);
-	pm_runtime_put(ms_dev(host));
+	pm_runtime_put_sync(ms_dev(host));
 
 	/* power-on delay */
-	if (param == MEMSTICK_POWER && value == MEMSTICK_POWER_ON)
+	if (param == MEMSTICK_POWER && value == MEMSTICK_POWER_ON) {
 		usleep_range(10000, 12000);
 
+		if (!host->eject)
+			schedule_delayed_work(&host->poll_card, 100);
+	}
+
 	dev_dbg(ms_dev(host), "%s: return = %d\n", __func__, err);
 	return err;
 }
@@ -654,9 +657,24 @@ static int rtsx_usb_ms_suspend(struct device *dev)
 	struct rtsx_usb_ms *host = dev_get_drvdata(dev);
 	struct memstick_host *msh = host->msh;
 
-	dev_dbg(ms_dev(host), "--> %s\n", __func__);
+	/* Since we use rtsx_usb's resume callback to runtime resume its
+	 * children to implement remote wakeup signaling, this causes
+	 * rtsx_usb_ms' runtime resume callback runs after its suspend
+	 * callback:
+	 * rtsx_usb_ms_suspend()
+	 * rtsx_usb_resume()
+	 *   -> rtsx_usb_ms_runtime_resume()
+	 *     -> memstick_detect_change()
+	 *
+	 * rtsx_usb_suspend()
+	 *
+	 * To avoid this, skip runtime resume/suspend if system suspend is
+	 * underway.
+	 */
 
+	host->system_suspending = true;
 	memstick_suspend_host(msh);
+
 	return 0;
 }
 
@@ -665,58 +683,85 @@ static int rtsx_usb_ms_resume(struct device *dev)
 	struct rtsx_usb_ms *host = dev_get_drvdata(dev);
 	struct memstick_host *msh = host->msh;
 
-	dev_dbg(ms_dev(host), "--> %s\n", __func__);
-
 	memstick_resume_host(msh);
+	host->system_suspending = false;
+
 	return 0;
 }
 #endif /* CONFIG_PM_SLEEP */
 
-/*
- * Thread function of ms card slot detection. The thread starts right after
- * successful host addition. It stops while the driver removal function sets
- * host->eject true.
- */
-static int rtsx_usb_detect_ms_card(void *__host)
+#ifdef CONFIG_PM
+static int rtsx_usb_ms_runtime_suspend(struct device *dev)
 {
-	struct rtsx_usb_ms *host = (struct rtsx_usb_ms *)__host;
+	struct rtsx_usb_ms *host = dev_get_drvdata(dev);
+
+	if (host->system_suspending)
+		return 0;
+
+	if (host->msh->card || host->power_mode != MEMSTICK_POWER_OFF)
+		return -EAGAIN;
+
+	return 0;
+}
+
+static int rtsx_usb_ms_runtime_resume(struct device *dev)
+{
+	struct rtsx_usb_ms *host = dev_get_drvdata(dev);
+
+
+	if (host->system_suspending)
+		return 0;
+
+	memstick_detect_change(host->msh);
+
+	return 0;
+}
+#endif /* CONFIG_PM */
+
+static const struct dev_pm_ops rtsx_usb_ms_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(rtsx_usb_ms_suspend, rtsx_usb_ms_resume)
+	SET_RUNTIME_PM_OPS(rtsx_usb_ms_runtime_suspend, rtsx_usb_ms_runtime_resume, NULL)
+};
+
+
+static void rtsx_usb_ms_poll_card(struct work_struct *work)
+{
+	struct rtsx_usb_ms *host = container_of(work, struct rtsx_usb_ms,
+			poll_card.work);
 	struct rtsx_ucr *ucr = host->ucr;
-	u8 val = 0;
 	int err;
+	u8 val;
 
-	for (;;) {
-		pm_runtime_get_sync(ms_dev(host));
-		mutex_lock(&ucr->dev_mutex);
-
-		/* Check pending MS card changes */
-		err = rtsx_usb_read_register(ucr, CARD_INT_PEND, &val);
-		if (err) {
-			mutex_unlock(&ucr->dev_mutex);
-			goto poll_again;
-		}
+	if (host->eject || host->power_mode != MEMSTICK_POWER_ON)
+		return;
 
-		/* Clear the pending */
-		rtsx_usb_write_register(ucr, CARD_INT_PEND,
-				XD_INT | MS_INT | SD_INT,
-				XD_INT | MS_INT | SD_INT);
+	pm_runtime_get_sync(ms_dev(host));
+	mutex_lock(&ucr->dev_mutex);
 
+	/* Check pending MS card changes */
+	err = rtsx_usb_read_register(ucr, CARD_INT_PEND, &val);
+	if (err) {
 		mutex_unlock(&ucr->dev_mutex);
+		goto poll_again;
+	}
 
-		if (val & MS_INT) {
-			dev_dbg(ms_dev(host), "MS slot change detected\n");
-			memstick_detect_change(host->msh);
-		}
+	/* Clear the pending */
+	rtsx_usb_write_register(ucr, CARD_INT_PEND,
+			XD_INT | MS_INT | SD_INT,
+			XD_INT | MS_INT | SD_INT);
 
-poll_again:
-		pm_runtime_put(ms_dev(host));
-		if (host->eject)
-			break;
+	mutex_unlock(&ucr->dev_mutex);
 
-		schedule_timeout_idle(HZ);
+	if (val & MS_INT) {
+		dev_dbg(ms_dev(host), "MS slot change detected\n");
+		memstick_detect_change(host->msh);
 	}
 
-	complete(&host->detect_ms_exit);
-	return 0;
+poll_again:
+	pm_runtime_put_sync(ms_dev(host));
+
+	if (!host->eject && host->power_mode == MEMSTICK_POWER_ON)
+		schedule_delayed_work(&host->poll_card, 100);
 }
 
 static int rtsx_usb_ms_drv_probe(struct platform_device *pdev)
@@ -747,45 +792,42 @@ static int rtsx_usb_ms_drv_probe(struct platform_device *pdev)
 	mutex_init(&host->host_mutex);
 	INIT_WORK(&host->handle_req, rtsx_usb_ms_handle_req);
 
-	init_completion(&host->detect_ms_exit);
-	host->detect_ms = kthread_create(rtsx_usb_detect_ms_card, host,
-			"rtsx_usb_ms_%d", pdev->id);
-	if (IS_ERR(host->detect_ms)) {
-		dev_dbg(&(pdev->dev),
-				"Unable to create polling thread.\n");
-		err = PTR_ERR(host->detect_ms);
-		goto err_out;
-	}
+	INIT_DELAYED_WORK(&host->poll_card, rtsx_usb_ms_poll_card);
 
 	msh->request = rtsx_usb_ms_request;
 	msh->set_param = rtsx_usb_ms_set_param;
 	msh->caps = MEMSTICK_CAP_PAR4;
 
-	pm_runtime_enable(&pdev->dev);
+	pm_runtime_get_noresume(ms_dev(host));
+	pm_runtime_set_active(ms_dev(host));
+	pm_runtime_enable(ms_dev(host));
+
 	err = memstick_add_host(msh);
 	if (err)
 		goto err_out;
 
-	wake_up_process(host->detect_ms);
+	pm_runtime_put(ms_dev(host));
+
 	return 0;
 err_out:
 	memstick_free_host(msh);
+	pm_runtime_disable(ms_dev(host));
+	pm_runtime_put_noidle(ms_dev(host));
 	return err;
 }
 
 static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
 {
 	struct rtsx_usb_ms *host = platform_get_drvdata(pdev);
-	struct memstick_host *msh;
+	struct memstick_host *msh = host->msh;
 	int err;
 
-	msh = host->msh;
 	host->eject = true;
 	cancel_work_sync(&host->handle_req);
 
 	mutex_lock(&host->host_mutex);
 	if (host->req) {
-		dev_dbg(&(pdev->dev),
+		dev_dbg(ms_dev(host),
 			"%s: Controller removed during transfer\n",
 			dev_name(&msh->dev));
 		host->req->error = -ENOMEDIUM;
@@ -797,7 +839,6 @@ static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
 	}
 	mutex_unlock(&host->host_mutex);
 
-	wait_for_completion(&host->detect_ms_exit);
 	memstick_remove_host(msh);
 	memstick_free_host(msh);
 
@@ -807,18 +848,15 @@ static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
 	if (pm_runtime_active(ms_dev(host)))
 		pm_runtime_put(ms_dev(host));
 
-	pm_runtime_disable(&pdev->dev);
+	pm_runtime_disable(ms_dev(host));
 	platform_set_drvdata(pdev, NULL);
 
-	dev_dbg(&(pdev->dev),
+	dev_dbg(ms_dev(host),
 		": Realtek USB Memstick controller has been removed\n");
 
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(rtsx_usb_ms_pm_ops,
-		rtsx_usb_ms_suspend, rtsx_usb_ms_resume);
-
 static struct platform_device_id rtsx_usb_ms_ids[] = {
 	{
 		.name = "rtsx_usb_ms",