Merge tag 'mmc-v5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc

Pull MMC updates from Ulf Hansson:
 "MMC core:
   - Fixup max_discard/trim calculations
   - Announce SD specs greater than 4.0
   - Add discard support for SD cards
   - Don't do retries for CMD6 (SWITCH command)
   - Various cleanups and re-structuring

  MMC host:
   - cqhci:
      * Add maintainers for eMMC CQHCI driver
   - sdhci:
      * Consolidate WP GPIO code
      * Add ADMA3 DMA support for V4 enabled host
      * Fixup card detect support in pci-o2micro driver
      * Add support for CMDQ and SDMMC pads auto-calibration in tegra
        driver
      * Add DCMD support and CMDQ support, support for i.MX6ULL variant,
        fixup HS400 timing issue and add HS400_ES support for i.MX8QXP
        to esdhc-imx driver
      * Avoid CRC errors by adjusting settings to speed mode and fixup
        card initialization for high speed mode in renesas_sdhi
      * Fixup timeout settings for omap
      * Enable 8 bits bus-width support in atmel-mci
      * Convert some legacy code in jz4740 driver to use modern APIs
      * Send a CMD12 to clear DPSM at errors for STM32 sdmmc mmci
        driver"

* tag 'mmc-v5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc: (69 commits)
  mmc:fix a bug when max_discard is 0
  mmc: core: Add a debug print when the card may have been replaced
  mmc: core: Add sd discard timeout
  mmc: core: Add discard support to sd
  mmc: sdhci-esdhc-imx: clear the HALT bit when enable CQE
  mmc: core: do not retry CMD6 in __mmc_switch()
  mmc: core: Convert mmc_align_data_size() into an SDIO specific function
  mmc: core: Move mmc_of_parse_voltage() to host.c
  mmc: core: Convert mmc_regulator_get_ocrmask() to static
  mmc: core: Move regulator helpers to separate file
  mmc: of_mmc_spi: Convert to mmc_of_parse_voltage()
  mmc: core: Drop retries as in-parameter to mmc_wait_for_app_cmd()
  mmc: core: Convert mmc_wait_for_app_cmd() to static
  mmc: renesas_sdhi: Change HW adjustment register according to speed mode
  mmc: mmci: Send a CMD12 to clear the DPSM at errors
  mmc: sdhci-xenon: Fixup already marked switch fall-through
  mmc: sdhci-tegra: drop ->get_ro() implementation
  mmc: sdhci-omap: drop ->get_ro() implementation
  mmc: sdhci: use WP GPIO in sdhci_check_ro()
  mmc: wmt-sdmmc: Drop unused include
  ...

59 files changed, 1198 insertions, 686 deletions

diff --git a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt
index 9201a7d8d7b0..540c65ed9cba 100644
--- a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt
+++ b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt
@@ -15,6 +15,7 @@ Required properties:
 	       "fsl,imx6q-usdhc"
 	       "fsl,imx6sl-usdhc"
 	       "fsl,imx6sx-usdhc"
+	       "fsl,imx6ull-usdhc"
 	       "fsl,imx7d-usdhc"
 	       "fsl,imx8qxp-usdhc"
 
diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt
index f5a0923b34ca..cdbcfd3a4ff2 100644
--- a/Documentation/devicetree/bindings/mmc/mmc.txt
+++ b/Documentation/devicetree/bindings/mmc/mmc.txt
@@ -62,6 +62,8 @@ Optional properties:
   be referred to mmc-pwrseq-simple.txt. But now it's reused as a tunable delay
   waiting for I/O signalling and card power supply to be stable, regardless of
   whether pwrseq-simple is used. Default to 10ms if no available.
+- supports-cqe : The presence of this property indicates that the corresponding
+  MMC host controller supports HW command queue feature.
 
 *NOTE* on CD and WP polarity. To use common for all SD/MMC host controllers line
 polarity properties, we have to fix the meaning of the "normal" and "inverted"
diff --git a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
index 32b4b4e41923..2cecdc71d94c 100644
--- a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
@@ -39,12 +39,16 @@ sdhci@c8000200 {
 	bus-width = <8>;
 };
 
-Optional properties for Tegra210 and Tegra186:
+Optional properties for Tegra210, Tegra186 and Tegra194:
 - pinctrl-names, pinctrl-0, pinctrl-1 : Specify pad voltage
   configurations. Valid pinctrl-names are "sdmmc-3v3" and "sdmmc-1v8"
   for controllers supporting multiple voltage levels. The order of names
   should correspond to the pin configuration states in pinctrl-0 and
   pinctrl-1.
+- pinctrl-names : "sdmmc-3v3-drv" and "sdmmc-1v8-drv" are applicable for
+  Tegra210 where pad config registers are in the pinmux register domain
+  for pull-up-strength and pull-down-strength values configuration when
+  using pads at 3V3 and 1V8 levels.
 - nvidia,only-1-8-v : The presence of this property indicates that the
   controller operates at a 1.8 V fixed I/O voltage.
 - nvidia,pad-autocal-pull-up-offset-3v3,
diff --git a/Documentation/devicetree/bindings/mmc/ti-omap.txt b/Documentation/devicetree/bindings/mmc/ti-omap.txt
index 8de579969763..02fd31cf361d 100644
--- a/Documentation/devicetree/bindings/mmc/ti-omap.txt
+++ b/Documentation/devicetree/bindings/mmc/ti-omap.txt
@@ -24,31 +24,3 @@ Examples:
 		dmas = <&sdma 61 &sdma 62>;
 		dma-names = "tx", "rx";
 	};
-
-* TI MMC host controller for OMAP1 and 2420
-
-The MMC Host Controller on TI OMAP1 and 2420 family provides
-an interface for MMC, SD, and SDIO types of memory cards.
-
-This file documents differences between the core properties described
-by mmc.txt and the properties used by the omap mmc driver.
-
-Note that this driver will not work with omap2430 or later omaps,
-please see the omap hsmmc driver for the current omaps.
-
-Required properties:
-- compatible: Must be "ti,omap2420-mmc", for OMAP2420 controllers
-- ti,hwmods: For 2420, must be "msdi<n>", where n is controller
-  instance starting 1
-
-Examples:
-
-	msdi1: mmc@4809c000 {
-		compatible = "ti,omap2420-mmc";
-		ti,hwmods = "msdi1";
-		reg = <0x4809c000 0x80>;
-		interrupts = <83>;
-		dmas = <&sdma 61 &sdma 62>;
-		dma-names = "tx", "rx";
-	};
-
diff --git a/MAINTAINERS b/MAINTAINERS
index f1050734d909..84857bc78a61 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13616,11 +13616,18 @@ F:	drivers/mmc/host/sdhci-brcmstb*
 SECURE DIGITAL HOST CONTROLLER INTERFACE (SDHCI) DRIVER
 M:	Adrian Hunter <adrian.hunter@intel.com>
 L:	linux-mmc@vger.kernel.org
-T:	git git://git.infradead.org/users/ahunter/linux-sdhci.git
 S:	Maintained
 F:	drivers/mmc/host/sdhci*
 F:	include/linux/mmc/sdhci*
 
+EMMC CMDQ HOST CONTROLLER INTERFACE (CQHCI) DRIVER
+M:	Adrian Hunter <adrian.hunter@intel.com>
+M:	Ritesh Harjani <riteshh@codeaurora.org>
+M:	Asutosh Das <asutoshd@codeaurora.org>
+L:	linux-mmc@vger.kernel.org
+S:	Maintained
+F:	drivers/mmc/host/cqhci*
+
 SYNOPSYS SDHCI COMPLIANT DWC MSHC DRIVER
 M:	Prabu Thangamuthu <prabu.t@synopsys.com>
 M:	Manjunath M B <manjumb@synopsys.com>
diff --git a/drivers/mmc/core/Makefile b/drivers/mmc/core/Makefile
index abba078f7f49..95ffe008ebdf 100644
--- a/drivers/mmc/core/Makefile
+++ b/drivers/mmc/core/Makefile
@@ -8,7 +8,7 @@ mmc_core-y			:= core.o bus.o host.o \
 				   mmc.o mmc_ops.o sd.o sd_ops.o \
 				   sdio.o sdio_ops.o sdio_bus.o \
 				   sdio_cis.o sdio_io.o sdio_irq.o \
-				   slot-gpio.o
+				   slot-gpio.o regulator.o
 mmc_core-$(CONFIG_OF)		+= pwrseq.o
 obj-$(CONFIG_PWRSEQ_SIMPLE)	+= pwrseq_simple.o
 obj-$(CONFIG_PWRSEQ_SD8787)	+= pwrseq_sd8787.o
diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 9ce8eb51a60f..2c71a434c915 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -1124,7 +1124,7 @@ static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
 {
 	struct mmc_blk_data *md = mq->blkdata;
 	struct mmc_card *card = md->queue.card;
-	unsigned int from, nr, arg;
+	unsigned int from, nr;
 	int err = 0, type = MMC_BLK_DISCARD;
 	blk_status_t status = BLK_STS_OK;
 
@@ -1136,24 +1136,18 @@ static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
 	from = blk_rq_pos(req);
 	nr = blk_rq_sectors(req);
 
-	if (mmc_can_discard(card))
-		arg = MMC_DISCARD_ARG;
-	else if (mmc_can_trim(card))
-		arg = MMC_TRIM_ARG;
-	else
-		arg = MMC_ERASE_ARG;
 	do {
 		err = 0;
 		if (card->quirks & MMC_QUIRK_INAND_CMD38) {
 			err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 					 INAND_CMD38_ARG_EXT_CSD,
-					 arg == MMC_TRIM_ARG ?
+					 card->erase_arg == MMC_TRIM_ARG ?
 					 INAND_CMD38_ARG_TRIM :
 					 INAND_CMD38_ARG_ERASE,
 					 0);
 		}
 		if (!err)
-			err = mmc_erase(card, from, nr, arg);
+			err = mmc_erase(card, from, nr, card->erase_arg);
 	} while (err == -EIO && !mmc_blk_reset(md, card->host, type));
 	if (err)
 		status = BLK_STS_IOERR;
@@ -2768,8 +2762,8 @@ static int mmc_dbg_card_status_get(void *data, u64 *val)
 
 	return ret;
 }
-DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
-		NULL, "%08llx\n");
+DEFINE_DEBUGFS_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
+			 NULL, "%08llx\n");
 
 /* That is two digits * 512 + 1 for newline */
 #define EXT_CSD_STR_LEN 1025
@@ -2857,8 +2851,9 @@ static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
 
 	if (mmc_card_mmc(card) || mmc_card_sd(card)) {
 		md->status_dentry =
-			debugfs_create_file("status", S_IRUSR, root, card,
-					    &mmc_dbg_card_status_fops);
+			debugfs_create_file_unsafe("status", 0400, root,
+						   card,
+						   &mmc_dbg_card_status_fops);
 		if (!md->status_dentry)
 			return -EIO;
 	}
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index b27a1e620233..6db36dc870b5 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -21,7 +21,6 @@
 #include <linux/leds.h>
 #include <linux/scatterlist.h>
 #include <linux/log2.h>
-#include <linux/regulator/consumer.h>
 #include <linux/pm_runtime.h>
 #include <linux/pm_wakeup.h>
 #include <linux/suspend.h>
@@ -52,6 +51,7 @@
 
 /* The max erase timeout, used when host->max_busy_timeout isn't specified */
 #define MMC_ERASE_TIMEOUT_MS	(60 * 1000) /* 60 s */
+#define SD_DISCARD_TIMEOUT_MS	(250)
 
 static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
 
@@ -758,33 +758,6 @@ void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
 }
 EXPORT_SYMBOL(mmc_set_data_timeout);
 
-/**
- *	mmc_align_data_size - pads a transfer size to a more optimal value
- *	@card: the MMC card associated with the data transfer
- *	@sz: original transfer size
- *
- *	Pads the original data size with a number of extra bytes in
- *	order to avoid controller bugs and/or performance hits
- *	(e.g. some controllers revert to PIO for certain sizes).
- *
- *	Returns the improved size, which might be unmodified.
- *
- *	Note that this function is only relevant when issuing a
- *	single scatter gather entry.
- */
-unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
-{
-	/*
-	 * FIXME: We don't have a system for the controller to tell
-	 * the core about its problems yet, so for now we just 32-bit
-	 * align the size.
-	 */
-	sz = ((sz + 3) / 4) * 4;
-
-	return sz;
-}
-EXPORT_SYMBOL(mmc_align_data_size);
-
 /*
  * Allow claiming an already claimed host if the context is the same or there is
  * no context but the task is the same.
@@ -1112,55 +1085,6 @@ u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
 
 	return mask;
 }
-EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
-
-#ifdef CONFIG_OF
-
-/**
- * mmc_of_parse_voltage - return mask of supported voltages
- * @np: The device node need to be parsed.
- * @mask: mask of voltages available for MMC/SD/SDIO
- *
- * Parse the "voltage-ranges" DT property, returning zero if it is not
- * found, negative errno if the voltage-range specification is invalid,
- * or one if the voltage-range is specified and successfully parsed.
- */
-int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
-{
-	const u32 *voltage_ranges;
-	int num_ranges, i;
-
-	voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
-	num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
-	if (!voltage_ranges) {
-		pr_debug("%pOF: voltage-ranges unspecified\n", np);
-		return 0;
-	}
-	if (!num_ranges) {
-		pr_err("%pOF: voltage-ranges empty\n", np);
-		return -EINVAL;
-	}
-
-	for (i = 0; i < num_ranges; i++) {
-		const int j = i * 2;
-		u32 ocr_mask;
-
-		ocr_mask = mmc_vddrange_to_ocrmask(
-				be32_to_cpu(voltage_ranges[j]),
-				be32_to_cpu(voltage_ranges[j + 1]));
-		if (!ocr_mask) {
-			pr_err("%pOF: voltage-range #%d is invalid\n",
-				np, i);
-			return -EINVAL;
-		}
-		*mask |= ocr_mask;
-	}
-
-	return 1;
-}
-EXPORT_SYMBOL(mmc_of_parse_voltage);
-
-#endif /* CONFIG_OF */
 
 static int mmc_of_get_func_num(struct device_node *node)
 {
@@ -1190,246 +1114,6 @@ struct device_node *mmc_of_find_child_device(struct mmc_host *host,
 	return NULL;
 }
 
-#ifdef CONFIG_REGULATOR
-
-/**
- * mmc_ocrbitnum_to_vdd - Convert a OCR bit number to its voltage
- * @vdd_bit:	OCR bit number
- * @min_uV:	minimum voltage value (mV)
- * @max_uV:	maximum voltage value (mV)
- *
- * This function returns the voltage range according to the provided OCR
- * bit number. If conversion is not possible a negative errno value returned.
- */
-static int mmc_ocrbitnum_to_vdd(int vdd_bit, int *min_uV, int *max_uV)
-{
-	int		tmp;
-
-	if (!vdd_bit)
-		return -EINVAL;
-
-	/*
-	 * REVISIT mmc_vddrange_to_ocrmask() may have set some
-	 * bits this regulator doesn't quite support ... don't
-	 * be too picky, most cards and regulators are OK with
-	 * a 0.1V range goof (it's a small error percentage).
-	 */
-	tmp = vdd_bit - ilog2(MMC_VDD_165_195);
-	if (tmp == 0) {
-		*min_uV = 1650 * 1000;
-		*max_uV = 1950 * 1000;
-	} else {
-		*min_uV = 1900 * 1000 + tmp * 100 * 1000;
-		*max_uV = *min_uV + 100 * 1000;
-	}
-
-	return 0;
-}
-
-/**
- * mmc_regulator_get_ocrmask - return mask of supported voltages
- * @supply: regulator to use
- *
- * This returns either a negative errno, or a mask of voltages that
- * can be provided to MMC/SD/SDIO devices using the specified voltage
- * regulator.  This would normally be called before registering the
- * MMC host adapter.
- */
-int mmc_regulator_get_ocrmask(struct regulator *supply)
-{
-	int			result = 0;
-	int			count;
-	int			i;
-	int			vdd_uV;
-	int			vdd_mV;
-
-	count = regulator_count_voltages(supply);
-	if (count < 0)
-		return count;
-
-	for (i = 0; i < count; i++) {
-		vdd_uV = regulator_list_voltage(supply, i);
-		if (vdd_uV <= 0)
-			continue;
-
-		vdd_mV = vdd_uV / 1000;
-		result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
-	}
-
-	if (!result) {
-		vdd_uV = regulator_get_voltage(supply);
-		if (vdd_uV <= 0)
-			return vdd_uV;
-
-		vdd_mV = vdd_uV / 1000;
-		result = mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
-	}
-
-	return result;
-}
-EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask);
-
-/**
- * mmc_regulator_set_ocr - set regulator to match host->ios voltage
- * @mmc: the host to regulate
- * @supply: regulator to use
- * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
- *
- * Returns zero on success, else negative errno.
- *
- * MMC host drivers may use this to enable or disable a regulator using
- * a particular supply voltage.  This would normally be called from the
- * set_ios() method.
- */
-int mmc_regulator_set_ocr(struct mmc_host *mmc,
-			struct regulator *supply,
-			unsigned short vdd_bit)
-{
-	int			result = 0;
-	int			min_uV, max_uV;
-
-	if (vdd_bit) {
-		mmc_ocrbitnum_to_vdd(vdd_bit, &min_uV, &max_uV);
-
-		result = regulator_set_voltage(supply, min_uV, max_uV);
-		if (result == 0 && !mmc->regulator_enabled) {
-			result = regulator_enable(supply);
-			if (!result)
-				mmc->regulator_enabled = true;
-		}
-	} else if (mmc->regulator_enabled) {
-		result = regulator_disable(supply);
-		if (result == 0)
-			mmc->regulator_enabled = false;
-	}
-
-	if (result)
-		dev_err(mmc_dev(mmc),
-			"could not set regulator OCR (%d)\n", result);
-	return result;
-}
-EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr);
-
-static int mmc_regulator_set_voltage_if_supported(struct regulator *regulator,
-						  int min_uV, int target_uV,
-						  int max_uV)
-{
-	/*
-	 * Check if supported first to avoid errors since we may try several
-	 * signal levels during power up and don't want to show errors.
-	 */
-	if (!regulator_is_supported_voltage(regulator, min_uV, max_uV))
-		return -EINVAL;
-
-	return regulator_set_voltage_triplet(regulator, min_uV, target_uV,
-					     max_uV);
-}
-
-/**
- * mmc_regulator_set_vqmmc - Set VQMMC as per the ios
- *
- * For 3.3V signaling, we try to match VQMMC to VMMC as closely as possible.
- * That will match the behavior of old boards where VQMMC and VMMC were supplied
- * by the same supply.  The Bus Operating conditions for 3.3V signaling in the
- * SD card spec also define VQMMC in terms of VMMC.
- * If this is not possible we'll try the full 2.7-3.6V of the spec.
- *
- * For 1.2V and 1.8V signaling we'll try to get as close as possible to the
- * requested voltage.  This is definitely a good idea for UHS where there's a
- * separate regulator on the card that's trying to make 1.8V and it's best if
- * we match.
- *
- * This function is expected to be used by a controller's
- * start_signal_voltage_switch() function.
- */
-int mmc_regulator_set_vqmmc(struct mmc_host *mmc, struct mmc_ios *ios)
-{
-	struct device *dev = mmc_dev(mmc);
-	int ret, volt, min_uV, max_uV;
-
-	/* If no vqmmc supply then we can't change the voltage */
-	if (IS_ERR(mmc->supply.vqmmc))
-		return -EINVAL;
-
-	switch (ios->signal_voltage) {
-	case MMC_SIGNAL_VOLTAGE_120:
-		return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
-						1100000, 1200000, 1300000);
-	case MMC_SIGNAL_VOLTAGE_180:
-		return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
-						1700000, 1800000, 1950000);
-	case MMC_SIGNAL_VOLTAGE_330:
-		ret = mmc_ocrbitnum_to_vdd(mmc->ios.vdd, &volt, &max_uV);
-		if (ret < 0)
-			return ret;
-
-		dev_dbg(dev, "%s: found vmmc voltage range of %d-%duV\n",
-			__func__, volt, max_uV);
-
-		min_uV = max(volt - 300000, 2700000);
-		max_uV = min(max_uV + 200000, 3600000);
-
-		/*
-		 * Due to a limitation in the current implementation of
-		 * regulator_set_voltage_triplet() which is taking the lowest
-		 * voltage possible if below the target, search for a suitable
-		 * voltage in two steps and try to stay close to vmmc
-		 * with a 0.3V tolerance at first.
-		 */
-		if (!mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
-						min_uV, volt, max_uV))
-			return 0;
-
-		return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
-						2700000, volt, 3600000);
-	default:
-		return -EINVAL;
-	}
-}
-EXPORT_SYMBOL_GPL(mmc_regulator_set_vqmmc);
-
-#endif /* CONFIG_REGULATOR */
-
-/**
- * mmc_regulator_get_supply - try to get VMMC and VQMMC regulators for a host
- * @mmc: the host to regulate
- *
- * Returns 0 or errno. errno should be handled, it is either a critical error
- * or -EPROBE_DEFER. 0 means no critical error but it does not mean all
- * regulators have been found because they all are optional. If you require
- * certain regulators, you need to check separately in your driver if they got
- * populated after calling this function.
- */
-int mmc_regulator_get_supply(struct mmc_host *mmc)
-{
-	struct device *dev = mmc_dev(mmc);
-	int ret;
-
-	mmc->supply.vmmc = devm_regulator_get_optional(dev, "vmmc");
-	mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc");
-
-	if (IS_ERR(mmc->supply.vmmc)) {
-		if (PTR_ERR(mmc->supply.vmmc) == -EPROBE_DEFER)
-			return -EPROBE_DEFER;
-		dev_dbg(dev, "No vmmc regulator found\n");
-	} else {
-		ret = mmc_regulator_get_ocrmask(mmc->supply.vmmc);
-		if (ret > 0)
-			mmc->ocr_avail = ret;
-		else
-			dev_warn(dev, "Failed getting OCR mask: %d\n", ret);
-	}
-
-	if (IS_ERR(mmc->supply.vqmmc)) {
-		if (PTR_ERR(mmc->supply.vqmmc) == -EPROBE_DEFER)
-			return -EPROBE_DEFER;
-		dev_dbg(dev, "No vqmmc regulator found\n");
-	}
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
-
 /*
  * Mask off any voltages we don't support and select
  * the lowest voltage
@@ -1936,6 +1620,12 @@ static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
 {
 	unsigned int erase_timeout;
 
+	/* for DISCARD none of the below calculation applies.
+	 * the busy timeout is 250msec per discard command.
+	 */
+	if (arg == SD_DISCARD_ARG)
+		return SD_DISCARD_TIMEOUT_MS;
+
 	if (card->ssr.erase_timeout) {
 		/* Erase timeout specified in SD Status Register (SSR) */
 		erase_timeout = card->ssr.erase_timeout * qty +
@@ -2164,7 +1854,7 @@ static unsigned int mmc_align_erase_size(struct mmc_card *card,
  * @card: card to erase
  * @from: first sector to erase
  * @nr: number of sectors to erase
- * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
+ * @arg: erase command argument
  *
  * Caller must claim host before calling this function.
  */
@@ -2181,14 +1871,14 @@ int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
 	if (!card->erase_size)
 		return -EOPNOTSUPP;
 
-	if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
+	if (mmc_card_sd(card) && arg != SD_ERASE_ARG && arg != SD_DISCARD_ARG)
 		return -EOPNOTSUPP;
 </