Merge tag 'mmc-updates-for-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc

Pull MMC update from Chris Ball: "MMC highlights for 3.9: Core: - Support for packed commands in eMMC 4.5. (This requires a host capability to be turned on. It increases write throughput by 20%+, but may also increase average write latency; more testing needed.) - Add DT bindings for capability flags. - Add mmc_of_parse() for shared DT parsing between drivers. Drivers: - android-goldfish: New MMC driver for the Android Goldfish emulator. - mvsdio: Add DT bindings, pinctrl, use slot-gpio for card detection. - omap_hsmmc: Fix boot hangs with RPMB partitions. - sdhci-bcm2835: New driver for controller used by Raspberry Pi. - sdhci-esdhc-imx: Add 8-bit data, auto CMD23 support, use slot-gpio. - sh_mmcif: Add support for eMMC DDR, bundled MMCIF IRQs. - tmio_mmc: Add DT bindings, support for vccq regulator" * tag 'mmc-updates-for-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc: (92 commits) mmc: tegra: assume CONFIG_OF, remove platform data mmc: add DT bindings for more MMC capability flags mmc: tmio: add support for the VccQ regulator mmc: tmio: remove unused and deprecated symbols mmc: sh_mobile_sdhi: use managed resource allocations mmc: sh_mobile_sdhi: remove unused .pdata field mmc: tmio-mmc: parse device-tree bindings mmc: tmio-mmc: define device-tree bindings mmc: sh_mmcif: use mmc_of_parse() to parse standard MMC DT bindings mmc: (cosmetic) remove "extern" from function declarations mmc: provide a standard MMC device-tree binding parser centrally mmc: detailed definition of CD and WP MMC line polarities in DT mmc: sdhi, tmio: only check flags in tmio-mmc driver proper mmc: sdhci: Fix parameter of sdhci_do_start_signal_voltage_switch() mmc: sdhci: check voltage range only on regulators aware of voltage value mmc: bcm2835: set SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK mmc: support packed write command for eMMC4.5 devices mmc: add packed command feature of eMMC4.5 mmc: rtsx: remove driving adjustment mmc: use regulator_can_change_voltage() instead of regulator_count_voltages ...
2026-04-30 13:48:59 -07:00 · 2013-02-26 09:31:09 -08:00
parent 0512c04a2b 0e78610294
commit ed5dc2372d
53 changed files with 3074 additions and 892 deletions
@@ -0,0 +1,18 @@
+Broadcom BCM2835 SDHCI controller
+
+This file documents differences between the core properties described
+by mmc.txt and the properties that represent the BCM2835 controller.
+
+Required properties:
+- compatible : Should be "brcm,bcm2835-sdhci".
+- clocks : The clock feeding the SDHCI controller.
+
+Example:
+
+sdhci: sdhci {
+	compatible = "brcm,bcm2835-sdhci";
+	reg = <0x7e300000 0x100>;
+	interrupts = <2 30>;
+	clocks = <&clk_mmc>;
+	bus-width = <4>;
+};
@@ -6,23 +6,45 @@ Interpreted by the OF core:
 - reg: Registers location and length.
 - interrupts: Interrupts used by the MMC controller.

-Required properties:
- bus-width: Number of data lines, can be <1>, <4>, or <8>
-
 Card detection:
-If no property below is supplied, standard SDHCI card detect is used.
+If no property below is supplied, host native card detect is used.
 Only one of the properties in this section should be supplied:
  - broken-cd: There is no card detection available; polling must be used.
  - cd-gpios: Specify GPIOs for card detection, see gpio binding
  - non-removable: non-removable slot (like eMMC); assume always present.

 Optional properties:
+- bus-width: Number of data lines, can be <1>, <4>, or <8>.  The default
+  will be <1> if the property is absent.
 - wp-gpios: Specify GPIOs for write protection, see gpio binding
- cd-inverted: when present, polarity on the cd gpio line is inverted
- wp-inverted: when present, polarity on the wp gpio line is inverted
+- cd-inverted: when present, polarity on the CD line is inverted. See the note
+  below for the case, when a GPIO is used for the CD line
+- wp-inverted: when present, polarity on the WP line is inverted. See the note
+  below for the case, when a GPIO is used for the WP line
 - max-frequency: maximum operating clock frequency
 - no-1-8-v: when present, denotes that 1.8v card voltage is not supported on
  this system, even if the controller claims it is.
+- cap-sd-highspeed: SD high-speed timing is supported
+- cap-mmc-highspeed: MMC high-speed timing is supported
+- cap-power-off-card: powering off the card is safe
+- cap-sdio-irq: enable SDIO IRQ signalling on this interface
+
+*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"
+line levels. We choose to follow the SDHCI standard, which specifies both those
+lines as "active low." Therefore, using the "cd-inverted" property means, that
+the CD line is active high, i.e. it is high, when a card is inserted. Similar
+logic applies to the "wp-inverted" property.
+
+CD and WP lines can be implemented on the hardware in one of two ways: as GPIOs,
+specified in cd-gpios and wp-gpios properties, or as dedicated pins. Polarity of
+dedicated pins can be specified, using *-inverted properties. GPIO polarity can
+also be specified using the OF_GPIO_ACTIVE_LOW flag. This creates an ambiguity
+in the latter case. We choose to use the XOR logic for GPIO CD and WP lines.
+This means, the two properties are "superimposed," for example leaving the
+OF_GPIO_ACTIVE_LOW flag clear and specifying the respective *-inverted
+property results in a double-inversion and actually means the "normal" line
+polarity is in effect.

 Optional SDIO properties:
 - keep-power-in-suspend: Preserves card power during a suspend/resume cycle
@@ -0,0 +1,17 @@
+* Marvell orion-sdio controller
+
+This file documents differences between the core properties in mmc.txt
+and the properties used by the orion-sdio driver.
+
+- compatible: Should be "marvell,orion-sdio"
+- clocks: reference to the clock of the SDIO interface
+
+Example:
+
+	mvsdio@d00d4000 {
+		compatible = "marvell,orion-sdio";
+		reg = <0xd00d4000 0x200>;
+		interrupts = <54>;
+		clocks = <&gateclk 17>;
+		status = "disabled";
+	};
@@ -26,8 +26,16 @@ Required Properties:
 	* bus-width: as documented in mmc core bindings.

 	* wp-gpios: specifies the write protect gpio line. The format of the
-	  gpio specifier depends on the gpio controller. If the write-protect
-	  line is not available, this property is optional.
+	  gpio specifier depends on the gpio controller. If a GPIO is not used
+	  for write-protect, this property is optional.
+
+	* disable-wp: If the wp-gpios property isn't present then (by default)
+	  we'd assume that the write protect is hooked up directly to the
+	  controller's special purpose write protect line (accessible via
+	  the WRTPRT register).  However, it's possible that we simply don't
+	  want write protect.  In that case specify 'disable-wp'.
+	  NOTE: This property is not required for slots known to always
+	  connect to eMMC or SDIO cards.

 Optional properties:

@@ -0,0 +1,20 @@
+* Toshiba Mobile IO SD/MMC controller
+
+The tmio-mmc driver doesn't probe its devices actively, instead its binding to
+devices is managed by either MFD drivers or by the sh_mobile_sdhi platform
+driver. Those drivers supply the tmio-mmc driver with platform data, that either
+describe hardware capabilities, known to them, or are obtained by them from
+their own platform data or from their DT information. In the latter case all
+compulsory and any optional properties, common to all SD/MMC drivers, as
+described in mmc.txt, can be used. Additionally the following tmio_mmc-specific
+optional bindings can be used.
+
+Optional properties:
+- toshiba,mmc-wrprotect-disable: write-protect detection is unavailable
+
+When used with Renesas SDHI hardware, the following compatibility strings
+configure various model-specific properties:
+
+"renesas,sh7372-sdhi":	(default) compatible with SH7372
+"renesas,r8a7740-sdhi":	compatible with R8A7740: certain MMC/SD commands have to
+			wait for the interface to become idle.
@@ -5692,7 +5692,7 @@ S:	Maintained
 F:	drivers/mmc/host/omap.c

 OMAP HS MMC SUPPORT
-M:	Venkatraman S <svenkatr@ti.com>
+M:	Balaji T K <balajitk@ti.com>
 L:	linux-mmc@vger.kernel.org
 L:	linux-omap@vger.kernel.org
 S:	Maintained
@@ -6804,6 +6804,14 @@ F:	include/linux/dw_dmac.h
 F:	drivers/dma/dw_dmac_regs.h
 F:	drivers/dma/dw_dmac.c

+SYNOPSYS DESIGNWARE MMC/SD/SDIO DRIVER
+M:	Seungwon Jeon <tgih.jun@samsung.com>
+M:	Jaehoon Chung <jh80.chung@samsung.com>
+L:	linux-mmc@vger.kernel.org
+S:	Maintained
+F:	include/linux/mmc/dw_mmc.h
+F:	drivers/mmc/host/dw_mmc*
+
 TIMEKEEPING, NTP
 M:	John Stultz <john.stultz@linaro.org>
 M:	Thomas Gleixner <tglx@linutronix.de>
@@ -151,6 +151,7 @@
 			reg = <0>;
 			bus-width = <4>;
 			samsung,cd-pinmux-gpio = <&gpc3 2 2 3 3>;
+			disable-wp;
 			gpios = <&gpc3 0 2 0 3>, <&gpc3 1 2 0 3>,
 				<&gpc3 3 2 3 3>, <&gpc3 4 2 3 3>,
 				<&gpc3 5 2 3 3>, <&gpc3 6 2 3 3>,
@@ -22,7 +22,8 @@

 #define MMC_QUEUE_BOUNCESZ	65536

-#define MMC_QUEUE_SUSPENDED	(1 << 0)
+
+#define MMC_REQ_SPECIAL_MASK	(REQ_DISCARD | REQ_FLUSH)

 /*
 * Prepare a MMC request. This just filters out odd stuff.
@@ -58,6 +59,7 @@ static int mmc_queue_thread(void *d)
 	do {
 		struct request *req = NULL;
 		struct mmc_queue_req *tmp;
+		unsigned int cmd_flags = 0;

 		spin_lock_irq(q->queue_lock);
 		set_current_state(TASK_INTERRUPTIBLE);
@@ -67,12 +69,23 @@ static int mmc_queue_thread(void *d)

 		if (req || mq->mqrq_prev->req) {
 			set_current_state(TASK_RUNNING);
+			cmd_flags = req ? req->cmd_flags : 0;
 			mq->issue_fn(mq, req);
+			if (mq->flags & MMC_QUEUE_NEW_REQUEST) {
+				mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
+				continue; /* fetch again */
+			}

 			/*
 			 * Current request becomes previous request
 			 * and vice versa.
+			 * In case of special requests, current request
+			 * has been finished. Do not assign it to previous
+			 * request.
 			 */
+			if (cmd_flags & MMC_REQ_SPECIAL_MASK)
+				mq->mqrq_cur->req = NULL;
+
 			mq->mqrq_prev->brq.mrq.data = NULL;
 			mq->mqrq_prev->req = NULL;
 			tmp = mq->mqrq_prev;
@@ -103,6 +116,8 @@ static void mmc_request_fn(struct request_queue *q)
 {
 	struct mmc_queue *mq = q->queuedata;
 	struct request *req;
+	unsigned long flags;
+	struct mmc_context_info *cntx;

 	if (!mq) {
 		while ((req = blk_fetch_request(q)) != NULL) {
@@ -112,7 +127,20 @@ static void mmc_request_fn(struct request_queue *q)
 		return;
 	}

-	if (!mq->mqrq_cur->req && !mq->mqrq_prev->req)
+	cntx = &mq->card->host->context_info;
+	if (!mq->mqrq_cur->req && mq->mqrq_prev->req) {
+		/*
+		 * New MMC request arrived when MMC thread may be
+		 * blocked on the previous request to be complete
+		 * with no current request fetched
+		 */
+		spin_lock_irqsave(&cntx->lock, flags);
+		if (cntx->is_waiting_last_req) {
+			cntx->is_new_req = true;
+			wake_up_interruptible(&cntx->wait);
+		}
+		spin_unlock_irqrestore(&cntx->lock, flags);
+	} else if (!mq->mqrq_cur->req && !mq->mqrq_prev->req)
 		wake_up_process(mq->thread);
 }

@@ -334,6 +362,49 @@ void mmc_cleanup_queue(struct mmc_queue *mq)
 }
 EXPORT_SYMBOL(mmc_cleanup_queue);

+int mmc_packed_init(struct mmc_queue *mq, struct mmc_card *card)
+{
+	struct mmc_queue_req *mqrq_cur = &mq->mqrq[0];
+	struct mmc_queue_req *mqrq_prev = &mq->mqrq[1];
+	int ret = 0;
+
+
+	mqrq_cur->packed = kzalloc(sizeof(struct mmc_packed), GFP_KERNEL);
+	if (!mqrq_cur->packed) {
+		pr_warn("%s: unable to allocate packed cmd for mqrq_cur\n",
+			mmc_card_name(card));
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	mqrq_prev->packed = kzalloc(sizeof(struct mmc_packed), GFP_KERNEL);
+	if (!mqrq_prev->packed) {
+		pr_warn("%s: unable to allocate packed cmd for mqrq_prev\n",
+			mmc_card_name(card));
+		kfree(mqrq_cur->packed);
+		mqrq_cur->packed = NULL;
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	INIT_LIST_HEAD(&mqrq_cur->packed->list);
+	INIT_LIST_HEAD(&mqrq_prev->packed->list);
+
+out:
+	return ret;
+}
+
+void mmc_packed_clean(struct mmc_queue *mq)
+{
+	struct mmc_queue_req *mqrq_cur = &mq->mqrq[0];
+	struct mmc_queue_req *mqrq_prev = &mq->mqrq[1];
+
+	kfree(mqrq_cur->packed);
+	mqrq_cur->packed = NULL;
+	kfree(mqrq_prev->packed);
+	mqrq_prev->packed = NULL;
+}
+
 /**
 * mmc_queue_suspend - suspend a MMC request queue
 * @mq: MMC queue to suspend
@@ -378,6 +449,41 @@ void mmc_queue_resume(struct mmc_queue *mq)
 	}
 }

+static unsigned int mmc_queue_packed_map_sg(struct mmc_queue *mq,
+					    struct mmc_packed *packed,
+					    struct scatterlist *sg,
+					    enum mmc_packed_type cmd_type)
+{
+	struct scatterlist *__sg = sg;
+	unsigned int sg_len = 0;
+	struct request *req;
+
+	if (mmc_packed_wr(cmd_type)) {
+		unsigned int hdr_sz = mmc_large_sector(mq->card) ? 4096 : 512;
+		unsigned int max_seg_sz = queue_max_segment_size(mq->queue);
+		unsigned int len, remain, offset = 0;
+		u8 *buf = (u8 *)packed->cmd_hdr;
+
+		remain = hdr_sz;
+		do {
+			len = min(remain, max_seg_sz);
+			sg_set_buf(__sg, buf + offset, len);
+			offset += len;
+			remain -= len;
+			(__sg++)->page_link &= ~0x02;
+			sg_len++;
+		} while (remain);
+	}
+
+	list_for_each_entry(req, &packed->list, queuelist) {
+		sg_len += blk_rq_map_sg(mq->queue, req, __sg);
+		__sg = sg + (sg_len - 1);
+		(__sg++)->page_link &= ~0x02;
+	}
+	sg_mark_end(sg + (sg_len - 1));
+	return sg_len;
+}
+
 /*
 * Prepare the sg list(s) to be handed of to the host driver
 */
@@ -386,14 +492,26 @@ unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq)
 	unsigned int sg_len;
 	size_t buflen;
 	struct scatterlist *sg;
+	enum mmc_packed_type cmd_type;
 	int i;

-	if (!mqrq->bounce_buf)
-		return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
+	cmd_type = mqrq->cmd_type;
+
+	if (!mqrq->bounce_buf) {
+		if (mmc_packed_cmd(cmd_type))
+			return mmc_queue_packed_map_sg(mq, mqrq->packed,
+						       mqrq->sg, cmd_type);
+		else
+			return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
+	}

 	BUG_ON(!mqrq->bounce_sg);

-	sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
+	if (mmc_packed_cmd(cmd_type))
+		sg_len = mmc_queue_packed_map_sg(mq, mqrq->packed,
+						 mqrq->bounce_sg, cmd_type);
+	else
+		sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);

 	mqrq->bounce_sg_len = sg_len;

@@ -12,6 +12,23 @@ struct mmc_blk_request {
 	struct mmc_data		data;
 };

+enum mmc_packed_type {
+	MMC_PACKED_NONE = 0,
+	MMC_PACKED_WRITE,
+};
+
+#define mmc_packed_cmd(type)	((type) != MMC_PACKED_NONE)
+#define mmc_packed_wr(type)	((type) == MMC_PACKED_WRITE)
+
+struct mmc_packed {
+	struct list_head	list;
+	u32			cmd_hdr[1024];
+	unsigned int		blocks;
+	u8			nr_entries;
+	u8			retries;
+	s16			idx_failure;
+};
+
 struct mmc_queue_req {
 	struct request		*req;
 	struct mmc_blk_request	brq;
@@ -20,6 +37,8 @@ struct mmc_queue_req {
 	struct scatterlist	*bounce_sg;
 	unsigned int		bounce_sg_len;
 	struct mmc_async_req	mmc_active;
+	enum mmc_packed_type	cmd_type;
+	struct mmc_packed	*packed;
 };

 struct mmc_queue {
@@ -27,6 +46,9 @@ struct mmc_queue {
 	struct task_struct	*thread;
 	struct semaphore	thread_sem;
 	unsigned int		flags;
+#define MMC_QUEUE_SUSPENDED	(1 << 0)
+#define MMC_QUEUE_NEW_REQUEST	(1 << 1)
+
 	int			(*issue_fn)(struct mmc_queue *, struct request *);
 	void			*data;
 	struct request_queue	*queue;
@@ -46,4 +68,7 @@ extern unsigned int mmc_queue_map_sg(struct mmc_queue *,
 extern void mmc_queue_bounce_pre(struct mmc_queue_req *);
 extern void mmc_queue_bounce_post(struct mmc_queue_req *);

+extern int mmc_packed_init(struct mmc_queue *, struct mmc_card *);
+extern void mmc_packed_clean(struct mmc_queue *);
+
 #endif
@@ -321,6 +321,7 @@ int mmc_add_card(struct mmc_card *card)
 #ifdef CONFIG_DEBUG_FS
 	mmc_add_card_debugfs(card);
 #endif
+	mmc_init_context_info(card->host);

 	ret = device_add(&card->dev);
 	if (ret)
@@ -319,11 +319,45 @@ out:
 }
 EXPORT_SYMBOL(mmc_start_bkops);

+/*
+ * mmc_wait_data_done() - done callback for data request
+ * @mrq: done data request
+ *
+ * Wakes up mmc context, passed as a callback to host controller driver
+ */
+static void mmc_wait_data_done(struct mmc_request *mrq)
+{
+	mrq->host->context_info.is_done_rcv = true;
+	wake_up_interruptible(&mrq->host->context_info.wait);
+}
+
 static void mmc_wait_done(struct mmc_request *mrq)
 {
 	complete(&mrq->completion);
 }

+/*
+ *__mmc_start_data_req() - starts data request
+ * @host: MMC host to start the request
+ * @mrq: data request to start
+ *
+ * Sets the done callback to be called when request is completed by the card.
+ * Starts data mmc request execution
+ */
+static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq)
+{
+	mrq->done = mmc_wait_data_done;
+	mrq->host = host;
+	if (mmc_card_removed(host->card)) {
+		mrq->cmd->error = -ENOMEDIUM;
+		mmc_wait_data_done(mrq);
+		return -ENOMEDIUM;
+	}
+	mmc_start_request(host, mrq);
+
+	return 0;
+}
+
 static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
 {
 	init_completion(&mrq->completion);
@@ -337,6 +371,62 @@ static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
 	return 0;
 }

+/*
+ * mmc_wait_for_data_req_done() - wait for request completed
+ * @host: MMC host to prepare the command.
+ * @mrq: MMC request to wait for
+ *
+ * Blocks MMC context till host controller will ack end of data request
+ * execution or new request notification arrives from the block layer.
+ * Handles command retries.
+ *
+ * Returns enum mmc_blk_status after checking errors.
+ */
+static int mmc_wait_for_data_req_done(struct mmc_host *host,
+				      struct mmc_request *mrq,
+				      struct mmc_async_req *next_req)
+{
+	struct mmc_command *cmd;
+	struct mmc_context_info *context_info = &host->context_info;
+	int err;
+	unsigned long flags;
+
+	while (1) {
+		wait_event_interruptible(context_info->wait,
+				(context_info->is_done_rcv ||
+				 context_info->is_new_req));
+		spin_lock_irqsave(&context_info->lock, flags);
+		context_info->is_waiting_last_req = false;
+		spin_unlock_irqrestore(&context_info->lock, flags);
+		if (context_info->is_done_rcv) {
+			context_info->is_done_rcv = false;
+			context_info->is_new_req = false;
+			cmd = mrq->cmd;
+			if (!cmd->error || !cmd->retries ||
+			    mmc_card_removed(host->card)) {
+				err = host->areq->err_check(host->card,
+							    host->areq);
+				break; /* return err */
+			} else {
+				pr_info("%s: req failed (CMD%u): %d, retrying...\n",
+					mmc_hostname(host),
+					cmd->opcode, cmd->error);
+				cmd->retries--;
+				cmd->error = 0;
+				host->ops->request(host, mrq);
+				continue; /* wait for done/new event again */
+			}
+		} else if (context_info->is_new_req) {
+			context_info->is_new_req = false;
+			if (!next_req) {
+				err = MMC_BLK_NEW_REQUEST;
+				break; /* return err */
+			}
+		}
+	}
+	return err;
+}
+
 static void mmc_wait_for_req_done(struct mmc_host *host,
 				  struct mmc_request *mrq)
 {
@@ -426,8 +516,16 @@ struct mmc_async_req *mmc_start_req(struct mmc_host *host,
 		mmc_pre_req(host, areq->mrq, !host->areq);

 	if (host->areq) {
-		mmc_wait_for_req_done(host, host->areq->mrq);
-		err = host->areq->err_check(host->card, host->areq);
+		err = mmc_wait_for_data_req_done(host, host->areq->mrq,	areq);
+		if (err == MMC_BLK_NEW_REQUEST) {
+			if (error)
+				*error = err;
+			/*
+			 * The previous request was not completed,
+			 * nothing to return
+			 */
+			return NULL;
+		}
 		/*
 		 * Check BKOPS urgency for each R1 response
 		 */
@@ -439,14 +537,14 @@ struct mmc_async_req *mmc_start_req(struct mmc_host *host,
 	}

 	if (!err && areq)
-		start_err = __mmc_start_req(host, areq->mrq);
+		start_err = __mmc_start_data_req(host, areq->mrq);

 	if (host->areq)
 		mmc_post_req(host, host->areq->mrq, 0);

 	 /* Cancel a prepared request if it was not started. */
 	if ((err || start_err) && areq)
-			mmc_post_req(host, areq->mrq, -EINVAL);
+		mmc_post_req(host, areq->mrq, -EINVAL);

 	if (err)
 		host->areq = NULL;
@@ -1137,7 +1235,7 @@ int mmc_regulator_set_ocr(struct mmc_host *mmc,
 		 */
 		voltage = regulator_get_voltage(supply);

-		if (regulator_count_voltages(supply) == 1)
+		if (!regulator_can_change_voltage(supply))
 			min_uV = max_uV = voltage;

 		if (voltage < 0)
@@ -1219,10 +1317,30 @@ u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
 	return ocr;
 }

-int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, bool cmd11)
+int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
+{
+	int err = 0;
+	int old_signal_voltage = host->ios.signal_voltage;
+
+	host->ios.signal_voltage = signal_voltage;
+	if (host->ops->start_signal_voltage_switch) {
+		mmc_host_clk_hold(host);
+		err = host->ops->start_signal_voltage_switch(host, &host->ios);
+		mmc_host_clk_release(host);
+	}
+
+	if (err)
+		host->ios.signal_voltage = old_signal_voltage;
+
+	return err;
+
+}
+
+int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
 {
 	struct mmc_command cmd = {0};
 	int err = 0;
+	u32 clock;

 	BUG_ON(!host);

@@ -1230,27 +1348,81 @@ int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, bool cmd11
 	 * Send CMD11 only if the request is to switch the card to
 	 * 1.8V signalling.
 	 */
-	if ((signal_voltage != MMC_SIGNAL_VOLTAGE_330) && cmd11) {
-		cmd.opcode = SD_SWITCH_VOLTAGE;
-		cmd.arg = 0;
-		cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+	if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
+		return __mmc_set_signal_voltage(host, signal_voltage);

-		err = mmc_wait_for_cmd(host, &cmd, 0);
-		if (err)
-			return err;
+	/*
+	 * If we cannot switch voltages, return failure so the caller
+	 * can continue without UHS mode
+	 */
+	if (!host->ops->start_signal_voltage_switch)
+		return -EPERM;
+	if (!host->ops->card_busy)
+		pr_warning("%s: cannot verify signal voltage switch\n",
+				mmc_hostname(host));

-		if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
-			return -EIO;
+	cmd.opcode = SD_SWITCH_VOLTAGE;
+	cmd.arg = 0;
+	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+
+	err = mmc_wait_for_cmd(host, &cmd, 0);
+	if (err)
+		return err;
+
+	if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
+		return -EIO;
+
+	mmc_host_clk_hold(host);
+	/*
+	 * The card should drive cmd and dat[0:3] low immediately
+	 * after the response of cmd11, but wait 1 ms to be sure
+	 */
+	mmc_delay(1);
+	if (host->ops->card_busy && !host->ops->card_busy(host)) {
+		err = -EAGAIN;
+		goto power_cycle;
+	}
+	/*
+	 * During a signal voltage level switch, the clock must be gated
+	 * for 5 ms according to the SD spec
+	 */
+	clock = host->ios.clock;
+	host->ios.clock = 0;
+	mmc_set_ios(host);
+
+	if (__mmc_set_signal_voltage(host, signal_voltage)) {
+		/*
+		 * Voltages may not have been switched, but we've already
+		 * sent CMD11, so a power cycle is required anyway
+		 */
+		err = -EAGAIN;
+		goto power_cycle;
 	}

-	host->ios.signal_voltage = signal_voltage;
+	/* Keep clock gated for at least 5 ms */
+	mmc_delay(5);
+	host->ios.clock = clock;
+	mmc_set_ios(host);

-	if (host->ops->start_signal_voltage_switch) {
-		mmc_host_clk_hold(host);
-		err = host->ops->start_signal_voltage_switch(host, &host->ios);
-		mmc_host_clk_release(host);
+	/* Wait for at least 1 ms according to spec */
+	mmc_delay(1);
+
+	/*
+	 * Failure to switch is indicated by the card holding
+	 * dat[0:3] low
+	 */
+	if (host->ops->card_busy && host->ops->card_busy(host))
+		err = -EAGAIN;
+
+power_cycle:
+	if (err) {
+		pr_debug("%s: Signal voltage switch failed, "
+			"power cycling card\n", mmc_hostname(host));
+		mmc_power_cycle(host);
 	}

+	mmc_host_clk_release(host);
+
 	return err;
 }

@@ -1314,7 +1486,7 @@ static void mmc_power_up(struct mmc_host *host)
 	mmc_set_ios(host);

 	/* Set signal voltage to 3.3V */
-	mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, false);
+	__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);

 	/*
 	 * This delay should be sufficient to allow the power supply
@@ -1372,6 +1544,14 @@ void mmc_power_off(struct mmc_host *host)
 	mmc_host_clk_release(host);
 }

+void mmc_power_cycle(struct mmc_host *host)
+{
+	mmc_power_off(host);
+	/* Wait at least 1 ms according to SD spec */
+	mmc_delay(1);
+	mmc_power_up(host);
+}
+
 /*
 * Cleanup when the last reference to the bus operator is dropped.
 */
@@ -2388,6 +2568,7 @@ EXPORT_SYMBOL(mmc_flush_cache);
 * Turn the cache ON/OFF.
 * Turning the cache OFF shall trigger flushing of the data
 * to the non-volatile storage.
+ * This function should be called with host claimed
 */
 int mmc_cache_ctrl(struct mmc_host *host, u8 enable)
 {
@@ -2399,7 +2580,6 @@ int mmc_cache_ctrl(struct mmc_host *host, u8 enable)
 			mmc_card_is_removable(host))
 		return err;

-	mmc_claim_host(host);
 	if (card && mmc_card_mmc(card) &&
 			(card->ext_csd.cache_size > 0)) {
 		enable = !!enable;
@@ -2417,7 +2597,6 @@ int mmc_cache_ctrl(struct mmc_host *host, u8 enable)
 				card->ext_csd.cache_ctrl = enable;
 		}
 	}
-	mmc_release_host(host);

 	return err;
 }
@@ -2436,10 +2615,6 @@ int mmc_suspend_host(struct mmc_host *host)
 	cancel_delayed_work(&host->detect);
 	mmc_flush_scheduled_work();

-	err = mmc_cache_ctrl(host, 0);
-	if (err)
-		goto out;
-
 	mmc_bus_get(host);
 	if (host->bus_ops && !host->bus_dead) {
 		if (host->bus_ops->suspend) {
@@ -2581,6 +2756,23 @@ int mmc_pm_notify(struct notifier_block *notify_block,
 }
 #endif

+/**
+ * mmc_init_context_info() - init synchronization context
+ * @host: mmc host
+ *
+ * Init struct context_info needed to implement asynchronous
+ * request mechanism, used by mmc core, host driver and mmc requests
+ * supplier.
+ */
+void mmc_init_context_info(struct mmc_host *host)
+{
+	spin_lock_init(&host->context_info.lock);
+	host->context_info.is_new_req = false;
+	host->context_info.is_done_rcv = false;
+	host->context_info.is_waiting_last_req = false;
+	init_waitqueue_head(&host->context_info.wait);
+}
+
 static int __init mmc_init(void)
 {
 	int ret;
@@ -40,11 +40,12 @@ void mmc_set_ungated(struct mmc_host *host);
 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode);
 void mmc_set_bus_width(struct mmc_host *host, unsigned int width);
 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr);
-int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage,
-			   bool cmd11);
+int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage);
+int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage);
 void mmc_set_timing(struct mmc_host *host, unsigned int timing);
 void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type);
 void mmc_power_off(struct mmc_host *host);
+void mmc_power_cycle(struct mmc_host *host);

 static inline void mmc_delay(unsigned int ms)
 {
@@ -76,5 +77,6 @@ void mmc_remove_host_debugfs(struct mmc_host *host);
 void mmc_add_card_debugfs(struct mmc_card *card);
 void mmc_remove_card_debugfs(struct mmc_card *card);

+void mmc_init_context_info(struct mmc_host *host);
 #endif

@@ -15,6 +15,8 @@
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/idr.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
 #include <linux/pagemap.h>
 #include <linux/export.h>
 #include <linux/leds.h>
@@ -23,6 +25,7 @@

 #include <linux/mmc/host.h>
 #include <linux/mmc/card.h>
+#include <linux/mmc/slot-gpio.h>

 #include "core.h"
 #include "host.h"
@@ -294,6 +297,126 @@ static inline void mmc_host_clk_sysfs_init(struct mmc_host *host)

 #endif

+/**
+ *	mmc_of_parse() - parse host's device-tree node
+ *	@host: host whose node should be parsed.
+ *
+ * To keep the rest of the MMC subsystem unaware of whether DT has been
+ * used to to instantiate and configure this host instance or not, we
+ * parse the properties and set respective generic mmc-host flags and
+ * parameters.
+ */
+void mmc_of_parse(struct mmc_host *host)
+{
+	struct device_node *np;
+	u32 bus_width;
+	bool explicit_inv_wp, gpio_inv_wp = false;
+	enum of_gpio_flags flags;
+	int len, ret, gpio;
+
+	if (!host->parent || !host->parent->of_node)
+		return;
+
+	np = host->parent->of_node;
+
+	/* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
+	if (of_property_read_u32(np, "bus-width", &bus_width) < 0) {
+		dev_dbg(host->parent,
+			"\"bus-width\" property is missing, assuming 1 bit.\n");
+		bus_width = 1;
+	}
+
+	switch (bus_width) {
+	case 8:
+		host->caps |= MMC_CAP_8_BIT_DATA;
+		/* Hosts capable of 8-bit transfers can also do 4 bits */
+	case 4:
+		host->caps |= MMC_CAP_4_BIT_DATA;
+		break;
+	case 1:
+		break;
+	default:
+		dev_err(host->parent,
+			"Invalid \"bus-width\" value %ud!\n", bus_width);
+	}
+
+	/* f_max is obtained from the optional "max-frequency" property */
+	of_property_read_u32(np, "max-frequency", &host->f_max);
+
+	/*
+	 * Configure CD and WP pins. They are both by default active low to
+	 * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
+	 * mmc-gpio helpers are used to attach, configure and use them. If
+	 * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
+	 * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
+	 * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
+	 * is set. If the "non-removable" property is found, the
+	 * MMC_CAP_NONREMOVABLE capability is set and no card-detection
+	 * configuration is performed.
+	 */
+
+	/* Parse Card Detection */
+	if (of_find_property(np, "non-removable", &len)) {
+		host->caps |= MMC_CAP_NONREMOVABLE;
+	} else {
+		bool explicit_inv_cd, gpio_inv_cd = false;
+
+		explicit_inv_cd = of_property_read_bool(np, "cd-inverted");
+
+		if (of_find_property(np, "broken-cd", &len))
+			host->caps |= MMC_CAP_NEEDS_POLL;
+
+		gpio = of_get_named_gpio_flags(np, "cd-gpios", 0, &flags);
+		if (gpio_is_valid(gpio)) {
+			if (!(flags & OF_GPIO_ACTIVE_LOW))
+				gpio_inv_cd = true;
+
+			ret = mmc_gpio_request_cd(host, gpio);
+			if (ret < 0)
+				dev_err(host->parent,
+					"Failed to request CD GPIO #%d: %d!\n",
+					gpio, ret);
+			else
+				dev_info(host->parent, "Got CD GPIO #%d.\n",
+					 gpio);
+		}
+
+		if (explicit_inv_cd ^ gpio_inv_cd)
+			host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
+	}
+
+	/* Parse Write Protection */
+	explicit_inv_wp = of_property_read_bool(np, "wp-inverted");
+
+	gpio = of_get_named_gpio_flags(np, "wp-gpios", 0, &flags);
+	if (gpio_is_valid(gpio)) {
+		if (!(flags & OF_GPIO_ACTIVE_LOW))
+			gpio_inv_wp = true;
+
+		ret = mmc_gpio_request_ro(host, gpio);
+		if (ret < 0)
+			dev_err(host->parent,
+				"Failed to request WP GPIO: %d!\n", ret);
+	}
+	if (explicit_inv_wp ^ gpio_inv_wp)
+		host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
+
+	if (of_find_property(np, "cap-sd-highspeed", &len))
+		host->caps |= MMC_CAP_SD_HIGHSPEED;
+	if (of_find_property(np, "cap-mmc-highspeed", &len))
+		host->caps |= MMC_CAP_MMC_HIGHSPEED;
+	if (of_find_property(np, "cap-power-off-card", &len))
+		host->caps |= MMC_CAP_POWER_OFF_CARD;
+	if (of_find_property(np, "cap-sdio-irq", &len))
+		host->caps |= MMC_CAP_SDIO_IRQ;
+	if (of_find_property(np, "keep-power-in-suspend", &len))
+		host->pm_caps |= MMC_PM_KEEP_POWER;
+	if (of_find_property(np, "enable-sdio-wakeup", &len))
+		host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
+}
+
+EXPORT_SYMBOL(mmc_of_parse);
+
 /**
 *	mmc_alloc_host - initialise the per-host structure.
 *	@extra: sizeof private data structure
@@ -496,7 +496,7 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 		 * RPMB regions are defined in multiples of 128K.
 		 */
 		card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
-		if (ext_csd[EXT_CSD_RPMB_MULT]) {
+		if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) {
 			mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
 				EXT_CSD_PART_CONFIG_ACC_RPMB,
 				"rpmb", 0, false,
@@ -538,6 +538,11 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 		} else {
 			card->ext_csd.data_tag_unit_size = 0;
 		}
+
+		card->ext_csd.max_packed_writes =
+			ext_csd[EXT_CSD_MAX_PACKED_WRITES];
+		card->ext_csd.max_packed_reads =
+			ext_csd[EXT_CSD_MAX_PACKED_READS];
 	} else {
 		card->ext_csd.data_sector_size = 512;
 	}
@@ -769,11 +774,11 @@ static int mmc_select_hs200(struct mmc_card *card)

 	if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V &&
 			host->caps2 & MMC_CAP2_HS200_1_2V_SDR)
-		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120, 0);
+		err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);

 	if (err && card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_8V &&
 			host->caps2 & MMC_CAP2_HS200_1_8V_SDR)
-		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 0);
+		err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);

 	/* If fails try again during next card power cycle */
 	if (err)
@@ -1221,8 +1226,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 			 * WARNING: eMMC rules are NOT the same as SD DDR
 			 */
 			if (ddr == MMC_1_2V_DDR_MODE) {
-				err = mmc_set_signal_voltage(host,
-					MMC_SIGNAL_VOLTAGE_120, 0);
+				err = __mmc_set_signal_voltage(host,
+					MMC_SIGNAL_VOLTAGE_120);
 				if (err)
 					goto err;
 			}
@@ -1275,6 +1280,29 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 		}
 	}

+	/*
+	 * The mandatory minimum values are defined for packed command.
+	 * read: 5, write: 3
+	 */
+	if (card->ext_csd.max_packed_writes >= 3 &&
+	    card->ext_csd.max_packed_reads >= 5 &&
+	    host->caps2 & MMC_CAP2_PACKED_CMD) {
+		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+				EXT_CSD_EXP_EVENTS_CTRL,
+				EXT_CSD_PACKED_EVENT_EN,
+				card->ext_csd.generic_cmd6_time);
+		if (err && err != -EBADMSG)
+			goto free_card;
+		if (err) {
+			pr_warn("%s: Enabling packed event failed\n",
+				mmc_hostname(card->host));
+			card->ext_csd.packed_event_en = 0;
+			err = 0;
+		} else {
+			card->ext_csd.packed_event_en = 1;
+		}
+	}
+
 	if (!oldcard)
 		host->card = card;

@@ -1379,6 +1407,11 @@ static int mmc_suspend(struct mmc_host *host)
 	BUG_ON(!host->card);

 	mmc_claim_host(host);
+
+	err = mmc_cache_ctrl(host, 0);
+	if (err)
+		goto out;
+
 	if (mmc_can_poweroff_notify(host->card))
 		err = mmc_poweroff_notify(host->card, EXT_CSD_POWER_OFF_SHORT);
 	else if (mmc_card_can_sleep(host))
@@ -1386,8 +1419,9 @@ static int mmc_suspend(struct mmc_host *host)
 	else if (!mmc_host_is_spi(host))
 		err = mmc_deselect_cards(host);
 	host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
-	mmc_release_host(host);

+out:
+	mmc_release_host(host);
 	return err;
 }

@@ -363,6 +363,7 @@ int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
 	return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
 			ext_csd, 512);
 }
+EXPORT_SYMBOL_GPL(mmc_send_ext_csd);

 int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
 {
@@ -444,8 +444,7 @@ static void sd_update_bus_speed_mode(struct mmc_card *card)
 	 * If the host doesn't support any of the UHS-I modes, fallback on
 	 * default speed.
 	 */
-	if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
-	    MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))) {
+	if (!mmc_host_uhs(card->host)) {
 		card->sd_bus_speed = 0;
 		return;
 	}
@@ -713,6 +712,14 @@ int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
 {
 	int err;
 	u32 max_current;
+	int retries = 10;
+
+try_again:
+	if (!retries) {
+		ocr &= ~SD_OCR_S18R;
+		pr_warning("%s: Skipping voltage switch\n",
+			mmc_hostname(host));
+	}

 	/*
 	 * Since we're changing the OCR value, we seem to
@@ -734,10 +741,10 @@ int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)

 	/*
 	 * If the host supports one of UHS-I modes, request the card
-	 * to switch to 1.8V signaling level.
+	 * to switch to 1.8V signaling level. If the card has failed
+	 * repeatedly to switch however, skip this.
 	 */
-	if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
-	    MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))
+	if (retries && mmc_host_uhs(host))
 		ocr |= SD_OCR_S18R;

 	/*
@@ -748,7 +755,6 @@ int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
 	if (max_current > 150)
 		ocr |= SD_OCR_XPC;

-try_again:
 	err = mmc_send_app_op_cond(host, ocr, rocr);
 	if (err)
 		return err;
@@ -759,9 +765,12 @@ try_again:
 	 */
 	if (!mmc_host_is_spi(host) && rocr &&
 	   ((*rocr & 0x41000000) == 0x41000000)) {
-		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true);
-		if (err) {
-			ocr &= ~SD_OCR_S18R;
+		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
+		if (err == -EAGAIN) {
+			retries--;
+			goto try_again;
+		} else if (err) {
+			retries = 0;
 			goto try_again;
 		}
 	}
@@ -960,16 +969,6 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,

 		/* Card is an ultra-high-speed card */
 		mmc_card_set_uhs(card);
-
-		/*
-		 * Since initialization is now complete, enable preset
-		 * value registers for UHS-I cards.
-		 */
-		if (host->ops->enable_preset_value) {
-			mmc_host_clk_hold(card->host);
-			host->ops->enable_preset_value(host, true);
-			mmc_host_clk_release(card->host);
-		}
 	} else {
 		/*
 		 * Attempt to change to high-speed (if supported)
@@ -1148,13 +1147,6 @@ int mmc_attach_sd(struct mmc_host *host)
 	BUG_ON(!host);
 	WARN_ON(!host->claimed);

-	/* Disable preset value enable if already set since last time */
-	if (host->ops->enable_preset_value) {
-		mmc_host_clk_hold(host);
-		host->ops->enable_preset_value(host, false);
-		mmc_host_clk_release(host);
-	}
-
 	err = mmc_send_app_op_cond(host, 0, &ocr);
 	if (err)
 		return err;
@@ -157,10 +157,7 @@ static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
 			if (ret)
 				goto out;

-			if (card->host->caps &
-				(MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
-				 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
-				 MMC_CAP_UHS_DDR50)) {
+			if (mmc_host_uhs(card->host)) {
 				if (data & SDIO_UHS_DDR50)
 					card->sw_caps.sd3_bus_mode
 						|= SD_MODE_UHS_DDR50;
@@ -478,8 +475,7 @@ static int sdio_set_bus_speed_mode(struct mmc_card *card)
 	 * If the host doesn't support any of the UHS-I modes, fallback on
 	 * default speed.
 	 */
-	if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
-	    MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)))
+	if (!mmc_host_uhs(card->host))
 		return 0;

 	bus_speed = SDIO_SPEED_SDR12;
@@ -489,23 +485,27 @@ static int sdio_set_bus_speed_mode(struct mmc_card *card)
 			bus_speed = SDIO_SPEED_SDR104;
 			timing = MMC_TIMING_UHS_SDR104;
 			card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
+			card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
 	} else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
 		   (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
 			bus_speed = SDIO_SPEED_DDR50;
 			timing = MMC_TIMING_UHS_DDR50;
 			card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
+			card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
 	} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 		    MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
 		    SD_MODE_UHS_SDR50)) {
 			bus_speed = SDIO_SPEED_SDR50;
 			timing = MMC_TIMING_UHS_SDR50;
 			card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
+			card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
 	} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 		    MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
 		   (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
 			bus_speed = SDIO_SPEED_SDR25;
 			timing = MMC_TIMING_UHS_SDR25;
 			card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
+			card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
 	} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 		    MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
 		    MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
@@ -513,6 +513,7 @@ static int sdio_set_bus_speed_mode(struct mmc_card *card)
 			bus_speed = SDIO_SPEED_SDR12;
 			timing = MMC_TIMING_UHS_SDR12;
 			card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
+			card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
 	}

 	err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
@@ -583,10 +584,19 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
 {
 	struct mmc_card *card;
 	int err;
+	int retries = 10;

 	BUG_ON(!host);
 	WARN_ON(!host->claimed);

+try_again:
+	if (!retries) {
+		pr_warning("%s: Skipping voltage switch\n",
+				mmc_hostname(host));
+		ocr &= ~R4_18V_PRESENT;
+		host->ocr &= ~R4_18V_PRESENT;
+	}
+
 	/*
 	 * Inform the card of the voltage
 	 */
@@ -645,14 +655,16 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
 	 * systems that claim 1.8v signalling in fact do not support
 	 * it.
 	 */
-	if ((ocr & R4_18V_PRESENT) &&
-		(host->caps &
-			(MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
-			 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
-			 MMC_CAP_UHS_DDR50))) {
-		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
-				true);
-		if (err) {
+	if (!powered_resume && (ocr & R4_18V_PRESENT) && mmc_host_uhs(host)) {
+		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
+		if (err == -EAGAIN) {
+			sdio_reset(host);
+			mmc_go_idle(host);
+			mmc_send_if_cond(host, host->ocr_avail);
+			mmc_remove_card(card);
+			retries--;
+			goto try_again;
+		} else if (err) {
 			ocr &= ~R4_18V_PRESENT;
 			host->ocr &= ~R4_18V_PRESENT;
 		}
@@ -937,10 +949,12 @@ static int mmc_sdio_resume(struct mmc_host *host)
 	mmc_claim_host(host);

 	/* No need to reinitialize powered-resumed nonremovable cards */
-	if (mmc_card_is_removable(host) || !mmc_card_keep_power(host))
+	if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
+		sdio_reset(host);
+		mmc_go_idle(host);
 		err = mmc_sdio_init_card(host, host->ocr, host->card,
 					mmc_card_keep_power(host));
-	else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
+	} else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
 		/* We may have switched to 1-bit mode during suspend */
 		err = sdio_enable_4bit_bus(host->card);
 		if (err > 0) {
@@ -1020,6 +1034,10 @@ static int mmc_sdio_power_restore(struct mmc_host *host)
 		goto out;
 	}

+	if (mmc_host_uhs(host))
+		/* to query card if 1.8V signalling is supported */
+		host->ocr |= R4_18V_PRESENT;
+
 	ret = mmc_sdio_init_card(host, host->ocr, host->card,
 				mmc_card_keep_power(host));
 	if (!ret && host->sdio_irqs)
@@ -1085,6 +1103,10 @@ int mmc_attach_sdio(struct mmc_host *host)
 	/*
 	 * Detect and init the card.
 	 */
+	if (mmc_host_uhs(host))
+		/* to query card if 1.8V signalling is supported */
+		host->ocr |= R4_18V_PRESENT;
+
 	err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
 	if (err) {
 		if (err == -EAGAIN) {
@@ -92,6 +92,20 @@ int mmc_gpio_get_cd(struct mmc_host *host)
 }
 EXPORT_SYMBOL(mmc_gpio_get_cd);

+/**
+ * mmc_gpio_request_ro - request a gpio for write-protection
+ * @host: mmc host
+ * @gpio: gpio number requested
+ *
+ * As devm_* managed functions are used in mmc_gpio_request_ro(), client
+ * drivers do not need to explicitly call mmc_gpio_free_ro() for freeing up,
+ * if the requesting and freeing are only needed at probing and unbinding time
+ * for once.  However, if client drivers do something special like runtime
+ * switching for write-protection, they are responsible for calling
+ * mmc_gpio_request_ro() and mmc_gpio_free_ro() as a pair on their own.
+ *
+ * Returns zero on success, else an error.
+ */
 int mmc_gpio_request_ro(struct mmc_host *host, unsigned int gpio)
 {
 	struct mmc_gpio *ctx;
@@ -106,7 +120,8 @@ int mmc_gpio_request_ro(struct mmc_host *host, unsigned int gpio)

 	ctx = host->slot.handler_priv;

-	ret = gpio_request_one(gpio, GPIOF_DIR_IN, ctx->ro_label);
+	ret = devm_gpio_request_one(&host->class_dev, gpio, GPIOF_DIR_IN,
+				    ctx->ro_label);
 	if (ret < 0)
 		return ret;

@@ -116,6 +131,20 @@ int mmc_gpio_request_ro(struct mmc_host *host, unsigned int gpio)
 }
 EXPORT_SYMBOL(mmc_gpio_request_ro);

+/**
+ * mmc_gpio_request_cd - request a gpio for card-detection
+ * @host: mmc host
+ * @gpio: gpio number requested
+ *
+ * As devm_* managed functions are used in mmc_gpio_request_cd(), client
+ * drivers do not need to explicitly call mmc_gpio_free_cd() for freeing up,
+ * if the requesting and freeing are only needed at probing and unbinding time
+ * for once.  However, if client drivers do something special like runtime
+ * switching for card-detection, they are responsible for calling
+ * mmc_gpio_request_cd() and mmc_gpio_free_cd() as a pair on their own.
+ *
+ * Returns zero on success, else an error.
+ */
 int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio)
 {
 	struct mmc_gpio *ctx;
@@ -128,7 +157,8 @@ int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio)

 	ctx = host->slot.handler_priv;

-	ret = gpio_request_one(gpio, GPIOF_DIR_IN, ctx->cd_label);
+	ret = devm_gpio_request_one(&host->class_dev, gpio, GPIOF_DIR_IN,
+				    ctx->cd_label);
 	if (ret < 0)
 		/*
 		 * don't bother freeing memory. It might still get used by other
@@ -146,7 +176,8 @@ int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio)
 		irq = -EINVAL;

 	if (irq >= 0) {
-		ret = request_threaded_irq(irq, NULL, mmc_gpio_cd_irqt,
+		ret = devm_request_threaded_irq(&host->class_dev, irq,
+			NULL, mmc_gpio_cd_irqt,
 			IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 			ctx->cd_label, host);
 		if (ret < 0)
@@ -164,6 +195,13 @@ int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio)
 }
 EXPORT_SYMBOL(mmc_gpio_request_cd);

+/**
+ * mmc_gpio_free_ro - free the write-protection gpio
+ * @host: mmc host
+ *
+ * It's provided only for cases that client drivers need to manually free
+ * up the write-protection gpio requested by mmc_gpio_request_ro().
+ */
 void mmc_gpio_free_ro(struct mmc_host *host)
 {
 	struct mmc_gpio *ctx = host->slot.handler_priv;
@@ -175,10 +213,17 @@ void mmc_gpio_free_ro(struct mmc_host *host)
 	gpio = ctx->ro_gpio;
 	ctx->ro_gpio = -EINVAL;

-	gpio_free(gpio);
+	devm_gpio_free(&host->class_dev, gpio);
 }
 EXPORT_SYMBOL(mmc_gpio_free_ro);

+/**
+ * mmc_gpio_free_cd - free the card-detection gpio
+ * @host: mmc host
+ *
+ * It's provided only for cases that client drivers need to manually free
+ * up the card-detection gpio requested by mmc_gpio_request_cd().
+ */
 void mmc_gpio_free_cd(struct mmc_host *host)
 {
 	struct mmc_gpio *ctx = host->slot.handler_priv;
@@ -188,13 +233,13 @@ void mmc_gpio_free_cd(struct mmc_host *host)
 		return;

 	if (host->slot.cd_irq >= 0) {
-		free_irq(host->slot.cd_irq, host);
+		devm_free_irq(&host->class_dev, host->slot.cd_irq, host);
 		host->slot.cd_irq = -EINVAL;
 	}

 	gpio = ctx->cd_gpio;
 	ctx->cd_gpio = -EINVAL;

-	gpio_free(gpio);
+	devm_gpio_free(&host->class_dev, gpio);
 }
 EXPORT_SYMBOL(mmc_gpio_free_cd);
@@ -238,6 +238,17 @@ config MMC_SDHCI_S3C_DMA

 	  YMMV.

+config MMC_SDHCI_BCM2835
+	tristate "SDHCI platform support for the BCM2835 SD/MMC Controller"
+	depends on ARCH_BCM2835
+	depends on MMC_SDHCI_PLTFM
+	select MMC_SDHCI_IO_ACCESSORS
+	help
+	  This selects the BCM2835 SD/MMC controller. If you have a BCM2835
+	  platform with SD or MMC devices, say Y or M here.
+
+	  If unsure, say N.
+
 config MMC_OMAP
 	tristate "TI OMAP Multimedia Card Interface support"
 	depends on ARCH_OMAP
@@ -361,6 +372,13 @@ config MMC_DAVINCI
          If you have an DAVINCI board with a Multimedia Card slot,
          say Y or M here.  If unsure, say N.

+config MMC_GOLDFISH
+	tristate "goldfish qemu Multimedia Card Interface support"
+	depends on GOLDFISH
+	help
+	  This selects the Goldfish Multimedia card Interface emulation
+	  found on the Goldfish Android virtual device emulation.
+
 config MMC_SPI
 	tristate "MMC/SD/SDIO over SPI"
 	depends on SPI_MASTER && !HIGHMEM && HAS_DMA
--- a/Show More
+++ b/Show More