Merge tag 'mmc-merge-for-3.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc

Pull MMC updates from Chris Ball:

Core:
 * Support for MMC 4.5 Data Tag feature -- we tag REQ_META, so devices
   that support Data Tag will provide increased throughput for metadata.
 * Faster detection of card removal on I/O errors.

Drivers:
 * dw_mmc now supports eMMC Power Off Notify, has PCI support, and
   implements pre_req and post_req for asynchronous requests.
 * omap_hsmmc now supports device tree.
 * esdhc now has power management support.
 * sdhci-tegra now supports Tegra30 devices.
 * sdhci-spear now supports hibernation.
 * tmio_mmc now supports using a GPIO for card detection.
 * Intel PCH now supports 8-bit bus transfers.

* tag 'mmc-merge-for-3.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc: (53 commits)
  mmc: sh_mmcif: simplify bitmask macros
  mmc: sh_mobile_sdhi: support modular mmc-core with non-standard hotplug
  mmc: sh_mobile_sdhi: add a callback for board specific init code
  mmc: tmio: cosmetic: prettify the tmio_mmc_set_ios() function
  mmc: sh_mobile_sdhi: do not manage PM clocks manually
  mmc: tmio_mmc: remove unused sdio_irq_enabled flag
  mmc: tmio_mmc: power status flag doesn't have to be exposed in platform data
  mmc: sh_mobile_sdhi: pass card hotplug GPIO number to TMIO MMC
  mmc: tmio_mmc: support the generic MMC GPIO card hotplug helper
  mmc: tmio: calculate the native hotplug condition only once
  mmc: simplify mmc_cd_gpio_request() by removing two parameters
  mmc: sdhci-pci: allow 8-bit bus width for Intel PCH
  mmc: sdhci: check interrupt flags in ISR again
  mmc: sdhci-pci: Add MSI support
  mmc: core: warn when card doesn't support HPI
  mmc: davinci: Poll status for small size transfers
  mmc: davinci: Eliminate spurious interrupts
  mmc: omap_hsmmc: Avoid a regulator voltage change with dt
  mmc: omap_hsmmc: Convert hsmmc driver to use device tree
  mmc: sdhci-pci: add SDHCI_QUIRK2_HOST_OFF_CARD_ON for Medfield SDIO
  ...

26 files changed, 1058 insertions, 645 deletions

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 4c3b2847e47c..eed213a5c8cb 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -1079,6 +1079,7 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
 	struct mmc_blk_request *brq = &mqrq->brq;
 	struct request *req = mqrq->req;
 	struct mmc_blk_data *md = mq->data;
+	bool do_data_tag;
 
 	/*
 	 * Reliable writes are used to implement Forced Unit Access and
@@ -1155,6 +1156,16 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
 		mmc_apply_rel_rw(brq, card, req);
 
 	/*
+	 * Data tag is used only during writing meta data to speed
+	 * up write and any subsequent read of this meta data
+	 */
+	do_data_tag = (card->ext_csd.data_tag_unit_size) &&
+		(req->cmd_flags & REQ_META) &&
+		(rq_data_dir(req) == WRITE) &&
+		((brq->data.blocks * brq->data.blksz) >=
+		 card->ext_csd.data_tag_unit_size);
+
+	/*
 	 * Pre-defined multi-block transfers are preferable to
 	 * open ended-ones (and necessary for reliable writes).
 	 * However, it is not sufficient to just send CMD23,
@@ -1172,13 +1183,13 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
 	 * We'll avoid using CMD23-bounded multiblock writes for
 	 * these, while retaining features like reliable writes.
 	 */
-
-	if ((md->flags & MMC_BLK_CMD23) &&
-	    mmc_op_multi(brq->cmd.opcode) &&
-	    (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23))) {
+	if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
+	    (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
+	     do_data_tag)) {
 		brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
 		brq->sbc.arg = brq->data.blocks |
-			(do_rel_wr ? (1 << 31) : 0);
+			(do_rel_wr ? (1 << 31) : 0) |
+			(do_data_tag ? (1 << 29) : 0);
 		brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
 		brq->mrq.sbc = &brq->sbc;
 	}
diff --git a/drivers/mmc/core/cd-gpio.c b/drivers/mmc/core/cd-gpio.c
index 082202ae4a03..29de31e260dd 100644
--- a/drivers/mmc/core/cd-gpio.c
+++ b/drivers/mmc/core/cd-gpio.c
@@ -28,13 +28,17 @@ static irqreturn_t mmc_cd_gpio_irqt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-int mmc_cd_gpio_request(struct mmc_host *host, unsigned int gpio,
-			unsigned int irq, unsigned long flags)
+int mmc_cd_gpio_request(struct mmc_host *host, unsigned int gpio)
 {
 	size_t len = strlen(dev_name(host->parent)) + 4;
-	struct mmc_cd_gpio *cd = kmalloc(sizeof(*cd) + len, GFP_KERNEL);
+	struct mmc_cd_gpio *cd;
+	int irq = gpio_to_irq(gpio);
 	int ret;
 
+	if (irq < 0)
+		return irq;
+
+	cd = kmalloc(sizeof(*cd) + len, GFP_KERNEL);
 	if (!cd)
 		return -ENOMEM;
 
@@ -45,7 +49,8 @@ int mmc_cd_gpio_request(struct mmc_host *host, unsigned int gpio,
 		goto egpioreq;
 
 	ret = request_threaded_irq(irq, NULL, mmc_cd_gpio_irqt,
-				   flags, cd->label, host);
+				   IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+				   cd->label, host);
 	if (ret < 0)
 		goto eirqreq;
 
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 132378b89d76..14f262e9246d 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -188,6 +188,12 @@ mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
 	struct scatterlist *sg;
 #endif
 
+	if (mrq->sbc) {
+		pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
+			 mmc_hostname(host), mrq->sbc->opcode,
+			 mrq->sbc->arg, mrq->sbc->flags);
+	}
+
 	pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
 		 mmc_hostname(host), mrq->cmd->opcode,
 		 mrq->cmd->arg, mrq->cmd->flags);
@@ -243,16 +249,17 @@ static void mmc_wait_done(struct mmc_request *mrq)
 	complete(&mrq->completion);
 }
 
-static void __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
+static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
 {
 	init_completion(&mrq->completion);
 	mrq->done = mmc_wait_done;
 	if (mmc_card_removed(host->card)) {
 		mrq->cmd->error = -ENOMEDIUM;
 		complete(&mrq->completion);
-		return;
+		return -ENOMEDIUM;
 	}
 	mmc_start_request(host, mrq);
+	return 0;
 }
 
 static void mmc_wait_for_req_done(struct mmc_host *host,
@@ -336,6 +343,7 @@ struct mmc_async_req *mmc_start_req(struct mmc_host *host,
 				    struct mmc_async_req *areq, int *error)
 {
 	int err = 0;
+	int start_err = 0;
 	struct mmc_async_req *data = host->areq;
 
 	/* Prepare a new request */
@@ -345,30 +353,23 @@ struct mmc_async_req *mmc_start_req(struct mmc_host *host,
 	if (host->areq) {
 		mmc_wait_for_req_done(host, host->areq->mrq);
 		err = host->areq->err_check(host->card, host->areq);
-		if (err) {
-			/* post process the completed failed request */
-			mmc_post_req(host, host->areq->mrq, 0);
-			if (areq)
-				/*
-				 * Cancel the new prepared request, because
-				 * it can't run until the failed
-				 * request has been properly handled.
-				 */
-				mmc_post_req(host, areq->mrq, -EINVAL);
-
-			host->areq = NULL;
-			goto out;
-		}
 	}
 
-	if (areq)
-		__mmc_start_req(host, areq->mrq);
+	if (!err && areq)
+		start_err = __mmc_start_req(host, areq->mrq);
 
 	if (host->areq)
 		mmc_post_req(host, host->areq->mrq, 0);
 
-	host->areq = areq;
- out:
+	 /* Cancel a prepared request if it was not started. */
+	if ((err || start_err) && areq)
+			mmc_post_req(host, areq->mrq, -EINVAL);
+
+	if (err)
+		host->areq = NULL;
+	else
+		host->areq = areq;
+
 	if (error)
 		*error = err;
 	return data;
@@ -599,105 +600,6 @@ unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
 EXPORT_SYMBOL(mmc_align_data_size);
 
 /**
- *	mmc_host_enable - enable a host.
- *	@host: mmc host to enable
- *
- *	Hosts that support power saving can use the 'enable' and 'disable'
- *	methods to exit and enter power saving states. For more information
- *	see comments for struct mmc_host_ops.
- */
-int mmc_host_enable(struct mmc_host *host)
-{
-	if (!(host->caps & MMC_CAP_DISABLE))
-		return 0;
-
-	if (host->en_dis_recurs)
-		return 0;
-
-	if (host->nesting_cnt++)
-		return 0;
-
-	cancel_delayed_work_sync(&host->disable);
-
-	if (host->enabled)
-		return 0;
-
-	if (host->ops->enable) {
-		int err;
-
-		host->en_dis_recurs = 1;
-		mmc_host_clk_hold(host);
-		err = host->ops->enable(host);
-		mmc_host_clk_release(host);
-		host->en_dis_recurs = 0;
-
-		if (err) {
-			pr_debug("%s: enable error %d\n",
-				 mmc_hostname(host), err);
-			return err;
-		}
-	}
-	host->enabled = 1;
-	return 0;
-}
-EXPORT_SYMBOL(mmc_host_enable);
-
-static int mmc_host_do_disable(struct mmc_host *host, int lazy)
-{
-	if (host->ops->disable) {
-		int err;
-
-		host->en_dis_recurs = 1;
-		mmc_host_clk_hold(host);
-		err = host->ops->disable(host, lazy);
-		mmc_host_clk_release(host);
-		host->en_dis_recurs = 0;
-
-		if (err < 0) {
-			pr_debug("%s: disable error %d\n",
-				 mmc_hostname(host), err);
-			return err;
-		}
-		if (err > 0) {
-			unsigned long delay = msecs_to_jiffies(err);
-
-			mmc_schedule_delayed_work(&host->disable, delay);
-		}
-	}
-	host->enabled = 0;
-	return 0;
-}
-
-/**
- *	mmc_host_disable - disable a host.
- *	@host: mmc host to disable
- *
- *	Hosts that support power saving can use the 'enable' and 'disable'
- *	methods to exit and enter power saving states. For more information
- *	see comments for struct mmc_host_ops.
- */
-int mmc_host_disable(struct mmc_host *host)
-{
-	int err;
-
-	if (!(host->caps & MMC_CAP_DISABLE))
-		return 0;
-
-	if (host->en_dis_recurs)
-		return 0;
-
-	if (--host->nesting_cnt)
-		return 0;
-
-	if (!host->enabled)
-		return 0;
-
-	err = mmc_host_do_disable(host, 0);
-	return err;
-}
-EXPORT_SYMBOL(mmc_host_disable);
-
-/**
  *	__mmc_claim_host - exclusively claim a host
  *	@host: mmc host to claim
  *	@abort: whether or not the operation should be aborted
@@ -735,8 +637,8 @@ int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
 		wake_up(&host->wq);
 	spin_unlock_irqrestore(&host->lock, flags);
 	remove_wait_queue(&host->wq, &wait);
-	if (!stop)
-		mmc_host_enable(host);
+	if (host->ops->enable && !stop && host->claim_cnt == 1)
+		host->ops->enable(host);
 	return stop;
 }
 
@@ -761,21 +663,28 @@ int mmc_try_claim_host(struct mmc_host *host)
 		claimed_host = 1;
 	}
 	spin_unlock_irqrestore(&host->lock, flags);
+	if (host->ops->enable && claimed_host && host->claim_cnt == 1)
+		host->ops->enable(host);
 	return claimed_host;
 }
 EXPORT_SYMBOL(mmc_try_claim_host);
 
 /**
- *	mmc_do_release_host - release a claimed host
+ *	mmc_release_host - release a host
  *	@host: mmc host to release
  *
- *	If you successfully claimed a host, this function will
- *	release it again.
+ *	Release a MMC host, allowing others to claim the host
+ *	for their operations.
  */
-void mmc_do_release_host(struct mmc_host *host)
+void mmc_release_host(struct mmc_host *host)
 {
 	unsigned long flags;
 
+	WARN_ON(!host->claimed);
+
+	if (host->ops->disable && host->claim_cnt == 1)
+		host->ops->disable(host);
+
 	spin_lock_irqsave(&host->lock, flags);
 	if (--host->claim_cnt) {
 		/* Release for nested claim */
@@ -787,67 +696,6 @@ void mmc_do_release_host(struct mmc_host *host)
 		wake_up(&host->wq);
 	}
 }
-EXPORT_SYMBOL(mmc_do_release_host);
-
-void mmc_host_deeper_disable(struct work_struct *work)
-{
-	struct mmc_host *host =
-		container_of(work, struct mmc_host, disable.work);
-
-	/* If the host is claimed then we do not want to disable it anymore */
-	if (!mmc_try_claim_host(host))
-		return;
-	mmc_host_do_disable(host, 1);
-	mmc_do_release_host(host);
-}
-
-/**
- *	mmc_host_lazy_disable - lazily disable a host.
- *	@host: mmc host to disable
- *
- *	Hosts that support power saving can use the 'enable' and 'disable'
- *	methods to exit and enter power saving states. For more information
- *	see comments for struct mmc_host_ops.
- */
-int mmc_host_lazy_disable(struct mmc_host *host)
-{
-	if (!(host->caps & MMC_CAP_DISABLE))
-		return 0;
-
-	if (host->en_dis_recurs)
-		return 0;
-
-	if (--host->nesting_cnt)
-		return 0;
-
-	if (!host->enabled)
-		return 0;
-
-	if (host->disable_delay) {
-		mmc_schedule_delayed_work(&host->disable,
-				msecs_to_jiffies(host->disable_delay));
-		return 0;
-	} else
-		return mmc_host_do_disable(host, 1);
-}
-EXPORT_SYMBOL(mmc_host_lazy_disable);
-
-/**
- *	mmc_release_host - release a host
- *	@host: mmc host to release
- *
- *	Release a MMC host, allowing others to claim the host
- *	for their operations.
- */
-void mmc_release_host(struct mmc_host *host)
-{
-	WARN_ON(!host->claimed);
-
-	mmc_host_lazy_disable(host);
-
-	mmc_do_release_host(host);
-}
-
 EXPORT_SYMBOL(mmc_release_host);
 
 /*
@@ -2115,18 +1963,36 @@ int _mmc_detect_card_removed(struct mmc_host *host)
 int mmc_detect_card_removed(struct mmc_host *host)
 {
 	struct mmc_card *card = host->card;
+	int ret;
 
 	WARN_ON(!host->claimed);
+
+	if (!card)
+		return 1;
+
+	ret = mmc_card_removed(card);
 	/*
 	 * The card will be considered unchanged unless we have been asked to
 	 * detect a change or host requires polling to provide card detection.
 	 */
-	if (card && !host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
-		return mmc_card_removed(card);
+	if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL) &&
+	    !(host->caps2 & MMC_CAP2_DETECT_ON_ERR))
+		return ret;
 
 	host->detect_change = 0;
+	if (!ret) {
+		ret = _mmc_detect_card_removed(host);
+		if (ret && (host->caps2 & MMC_CAP2_DETECT_ON_ERR)) {
+			/*
+			 * Schedule a detect work as soon as possible to let a
+			 * rescan handle the card removal.
+			 */
+			cancel_delayed_work(&host->detect);
+			mmc_detect_change(host, 0);
+		}
+	}
 
-	return _mmc_detect_card_removed(host);
+	return ret;
 }
 EXPORT_SYMBOL(mmc_detect_card_removed);
 
@@ -2203,8 +2069,6 @@ void mmc_stop_host(struct mmc_host *host)
 	spin_unlock_irqrestore(&host->lock, flags);
 #endif
 
-	if (host->caps & MMC_CAP_DISABLE)
-		cancel_delayed_work(&host->disable);
 	cancel_delayed_work_sync(&host->detect);
 	mmc_flush_scheduled_work();
 
@@ -2399,13 +2263,11 @@ int mmc_suspend_host(struct mmc_host *host)
 {
 	int err = 0;
 
-	if (host->caps & MMC_CAP_DISABLE)
-		cancel_delayed_work(&host->disable);
 	cancel_delayed_work(&host->detect);
 	mmc_flush_scheduled_work();
 	if (mmc_try_claim_host(host)) {
 		err = mmc_cache_ctrl(host, 0);
-		mmc_do_release_host(host);
+		mmc_release_host(host);
 	} else {
 		err = -EBUSY;
 	}
@@ -2426,7 +2288,7 @@ int mmc_suspend_host(struct mmc_host *host)
 			if (host->bus_ops->suspend) {
 				err = host->bus_ops->suspend(host);
 			}
-			mmc_do_release_host(host);
+			mmc_release_host(host);
 
 			if (err == -ENOSYS || !host->bus_ops->resume) {
 				/*
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index c3704e293a7b..91c84c7a1829 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -330,7 +330,6 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
 	spin_lock_init(&host->lock);
 	init_waitqueue_head(&host->wq);
 	INIT_DELAYED_WORK(&host->detect, mmc_rescan);
-	INIT_DELAYED_WORK_DEFERRABLE(&host->disable, mmc_host_deeper_disable);
 #ifdef CONFIG_PM
 	host->pm_notify.notifier_call = mmc_pm_notify;
 #endif
diff --git a/drivers/mmc/core/host.h b/drivers/mmc/core/host.h
index 08a7852ade44..f2ab9e578126 100644
--- a/drivers/mmc/core/host.h
+++ b/drivers/mmc/core/host.h
@@ -14,7 +14,6 @@
 
 int mmc_register_host_class(void);
 void mmc_unregister_host_class(void);
-void mmc_host_deeper_disable(struct work_struct *work);
 
 #endif
 
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 2b9ed1401dc4..02914d609a91 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -519,6 +519,20 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 			ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
 			ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
 			ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
+
+		if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
+			card->ext_csd.data_sector_size = 4096;
+		else
+			card->ext_csd.data_sector_size = 512;
+
+		if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
+		    (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
+			card->ext_csd.data_tag_unit_size =
+			((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
+			(card->ext_csd.data_sector_size);
+		} else {
+			card->ext_csd.data_tag_unit_size = 0;
+		}
 	}
 
 out:
@@ -938,7 +952,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 	 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
 	 * bit.  This bit will be lost every time after a reset or power off.
 	 */
-	if (card->ext_csd.enhanced_area_en) {
+	if (card->ext_csd.enhanced_area_en ||
+	    (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
 		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 				 EXT_CSD_ERASE_GROUP_DEF, 1,
 				 card->ext_csd.generic_cmd6_time);
@@ -1033,22 +1048,6 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 	}
 
 	/*
-	 * Enable HPI feature (if supported)
-	 */
-	if (card->ext_csd.hpi) {
-		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
-			EXT_CSD_HPI_MGMT, 1, 0);
-		if (err && err != -EBADMSG)
-			goto free_card;
-		if (err) {
-			pr_warning("%s: Enabling HPI failed\n",
-				   mmc_hostname(card->host));
-			err = 0;
-		} else
-			card->ext_csd.hpi_en = 1;
-	}
-
-	/*
 	 * Compute bus speed.
 	 */
 	max_dtr = (unsigned int)-1;
@@ -1097,9 +1096,12 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 		 * 4. execute tuning for HS200
 		 */
 		if ((host->caps2 & MMC_CAP2_HS200) &&
-		    card->host->ops->execute_tuning)
+		    card->host->ops->execute_tuning) {
+			mmc_host_clk_hold(card->host);
 			err = card->host->ops->execute_tuning(card->host,
 				MMC_SEND_TUNING_BLOCK_HS200);
+			mmc_host_clk_release(card->host);
+		}
 		if (err) {
 			pr_warning("%s: tuning execution failed\n",
 				   mmc_hostname(card->host));
@@ -1219,6 +1221,23 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 	}
 
 	/*
+	 * Enable HPI feature (if supported)
+	 */
+	if (card->ext_csd.hpi) {
+		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+				EXT_CSD_HPI_MGMT, 1,
+				card->ext_csd.generic_cmd6_time);
+		if (err && err != -EBADMSG)
+			goto free_card;
+		if (err) {
+			pr_warning("%s: Enabling HPI failed\n",
+				   mmc_hostname(card->host));
+			err = 0;
+		} else
+			card->ext_csd.hpi_en = 1;
+	}
+
+	/*
 	 * If cache size is higher than 0, this indicates
 	 * the existence of cache and it can be turned on.
 	 */
diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index 4d41fa984c93..69370f494e05 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -553,18 +553,22 @@ int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
 {
 	struct mmc_command cmd = {0};
 	unsigned int opcode;
-	unsigned int flags;
 	int err;
 
+	if (!card->ext_csd.hpi) {
+		pr_warning("%s: Card didn't support HPI command\n",
+			   mmc_hostname(card->host));
+		return -EINVAL;
+	}
+
 	opcode = card->ext_csd.hpi_cmd;
 	if (opcode == MMC_STOP_TRANSMISSION)
-		flags = MMC_RSP_R1 | MMC_CMD_AC;
+		cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
 	else if (opcode == MMC_SEND_STATUS)
-		flags = MMC_RSP_R1 | MMC_CMD_AC;
+		cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 
 	cmd.opcode = opcode;
 	cmd.arg = card->rca << 16 | 1;
-	cmd.flags = flags;
 	cmd.cmd_timeout_ms = card->ext_csd.out_of_int_time;
 
 	err = mmc_wait_for_cmd(card->host, &cmd, 0);
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index ecbee9bf87b2..2bc06e7344db 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -533,6 +533,31 @@ config MMC_DW_IDMAC
 	  Designware Mobile Storage IP block. This disables the external DMA
 	  interface.
 
+config MMC_DW_PLTFM
+	tristate "Synopsys Designware MCI Support as platform device"
+	depends on MMC_DW
+	default y
+	help
+	  This selects the common helper functions support for Host Controller
+	  Interface based platform driver. Please select this option if the IP
+	  is present as a platform device. This is the common interface for the
+	  Synopsys Designware IP.
+
+	  If you have a controller with this interface, say Y or M here.
+
+	  If unsure, say Y.
+
+config MMC_DW_PCI
+	tristate "Synopsys Designware MCI support on PCI bus"
+	depends on MMC_DW && PCI
+	help
+	  This selects the PCI bus for the Synopsys Designware Mobile Storage IP.
+	  Select this option if the IP is present on PCI platform.
+
+	  If you have a controller with this interface, say Y or M here.
+
+	  If unsure, say N.
+
 config MMC_SH_MMCIF
 	tristate "SuperH Internal MMCIF support"
 	depends on MMC_BLOCK && (SUPERH || ARCH_SHMOBILE)
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 745f8fce2519..3e7e26d08073 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -39,6 +39,8 @@ obj-$(CONFIG_MMC_CB710)		+= cb710-mmc.o
 obj-$(CONFIG_MMC_VIA_SDMMC)	+= via-sdmmc.o
 obj-$(CONFIG_SDH_BFIN)		+= bfin_sdh.o
 obj-$(CONFIG_MMC_DW)		+= dw_mmc.o
+obj-$(CONFIG_MMC_DW_PLTFM)	+= dw_mmc-pltfm.o
+obj-$(CONFIG_MMC_DW_PCI)	+= dw_mmc-pci.o
 obj-$(CONFIG_MMC_SH_MMCIF)	+= sh_mmcif.o
 obj-$(CONFIG_MMC_JZ4740)	+= jz4740_mmc.o
 obj-$(CONFIG_MMC_VUB300)	+= vub300.o
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index e4449a54ae8f..390863e7efbd 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -1975,7 +1975,7 @@ static bool atmci_configure_dma(struct atmel_mci *host)
 		return false;
 	} else {
 		dev_info(&host->pdev->dev,
-					"Using %s for DMA transfers\n",
+					"using %s for DMA transfers\n",
 					dma_chan_name(host->dma.chan));
 		return true;
 	}
diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
index 64a8325a4a8a..c1f3673ae1ef 100644
--- a/drivers/mmc/host/davinci_mmc.c
+++ b/drivers/mmc/host/davinci_mmc.c
@@ -160,6 +160,16 @@ module_param(rw_threshold, uint, S_IRUGO);
 MODULE_PARM_DESC(rw_threshold,
 		"Read/Write threshold. Default = 32");
 
+static unsigned poll_threshold = 128;
+module_param(poll_threshold, uint, S_IRUGO);
+MODULE_PARM_DESC(poll_threshold,
+		 "Polling transaction size threshold. Default = 128");
+
+static unsigned poll_loopcount = 32;
+module_param(poll_loopcount, uint, S_IRUGO);
+MODULE_PARM_DESC(poll_loopcount,
+		 "Maximum polling loop count. Default = 32");
+
 static unsigned __initdata use_dma = 1;
 module_param(use_dma, uint, 0);
 MODULE_PARM_DESC(use_dma, "Whether to use DMA or not. Default = 1");
@@ -193,6 +203,7 @@ struct mmc_davinci_host {
 	bool use_dma;
 	bool do_dma;
 	bool sdio_int;
+	bool active_request;
 
 	/* Scatterlist DMA uses one or more parameter RAM entries:
 	 * the main one (associated with rxdma or txdma) plus zero or
@@ -219,6 +230,7 @@ struct mmc_davinci_host {
 #endif
 };
 
+static irqreturn_t mmc_davinci_irq(int irq, void *dev_id);
 
 /* PIO only */
 static void mmc_davinci_sg_to_buf(struct mmc_davinci_host *host)
@@ -376,7 +388,20 @@ static void mmc_davinci_start_command(struct mmc_davinci_host *host,
 
 	writel(cmd->arg, host->base + DAVINCI_MMCARGHL);
 	writel(cmd_reg,  host->base + DAVINCI_MMCCMD);
-	writel(im_val, host->base + DAVINCI_MMCIM);
+
+	host->active_request = true;
+
+	if (!host->do_dma && host->bytes_left <= poll_threshold) {
+		u32 count = poll_loopcount;
+
+		while (host->active_request && count--) {
+			mmc_davinci_irq(0, host);
+			cpu_relax();
+		}
+	}
+
+	if (host->active_request)
+		writel(im_val, host->base + DAVINCI_MMCIM);
 }
 
 /*----------------------------------------------------------------------*/
@@ -915,6 +940,7 @@ mmc_davinci_xfer_done(struct mmc_davinci_host *host, struct mmc_data *data)
 	if (!data->stop || (host->cmd && host->cmd->error)) {
 		mmc_request_done(host->mmc, data->mrq);
 		writel(0, host->base + DAVINCI_MMCIM);
+		host->active_request = false;
 	} else
 		mmc_davinci_start_command(host, data->stop);
 }
@@ -942,6 +968,7 @@ static void mmc_davinci_cmd_done(struct mmc_davinci_host *host,
 			cmd->mrq->cmd->retries = 0;
 		mmc_request_done(host->mmc, cmd->mrq);
 		writel(0, host->base + DAVINCI_MMCIM);
+		host->active_request = false;
 	}
 }
 
@@ -1009,12 +1036,33 @@ static irqreturn_t mmc_davinci_irq(int irq, void *dev_id)
 	 * by read. So, it is not unbouned loop even in the case of
 	 * non-dma.
 	 */
-	while (host->bytes_left && (status & (MMCST0_DXRDY | MMCST0_DRRDY))) {
-		davinci_fifo_data_trans(host, rw_threshold);
-		status = readl(host->base + DAVINCI_MMCST0);
-		if (!status)
-			break;
-		qstatus |= status;
+	if (host->bytes_left && (status & (MMCST0_DXRDY | MMCST0_DRRDY))) {
+		unsigned long im_val;
+
+		/*
+		 * If interrupts fire during the following loop, they will be
+		 * handled by the handler, but the PIC will still buffer these.
+		 * As a result, the handler will be called again to serve these
+		 * needlessly. In order to avoid these spurious interrupts,
+		 * keep interrupts masked during the loop.
+		 */
+		im_val = readl(host->base + DAVINCI_MMCIM);
+		writel(0, host->base + DAVINCI_MMCIM);
+
+		do {
+			davinci_fifo_data_trans(host, rw_threshold);
+			status = readl(host->base + DAVINCI_MMCST0);
+			qstatus |= status;
+		} while (host->bytes_left &&
+			 (status & (MMCST0_DXRDY | MMCST0_DRRDY)));
+
+		/*
+		 * If an interrupt is pending, it is assumed it will fire when
+		 * it is unmasked. This assumption is also taken when the MMCIM
+		 * is first set. Otherwise, writing to MMCIM after reading the
+		 * status is race-prone.
+		 */
+		writel(im_val, host->base + DAVINCI_MMCIM);
 	}
 
 	if (qstatus & MMCST0_DATDNE) {
@@ -1418,17 +1466,14 @@ static int davinci_mmcsd_suspend(struct device *dev)
 	struct mmc_davinci_host *host = platform_get_drvdata(pdev);
 	int ret;
 
-	mmc_host_enable(host->mmc);
 	ret = mmc_suspend_host(host->mmc);
 	if (!ret) {
 		writel(0, host->base + DAVINCI_MMCIM);
 		mmc_davinci_reset_ctrl(host, 1);
-		mmc_host_disable(host->mmc);
 		clk_disable(host->clk);
 		host->suspended = 1;
 	} else {
 		host->suspended = 0;
-		mmc_host_disable(host->mmc);
 	}
 
 	return ret;
@@ -1444,7 +1489,6 @@ static int davinci_mmcsd_resume(struct device *dev)
 		return 0;
 
 	clk_enable(host->clk);
-	mmc_host_enable(host->mmc);
 
 	mmc_davinci_reset_ctrl(host, 0);
 	ret = mmc_resume_host(host->mmc);
diff --git a/drivers/mmc/host/dw_mmc-pci.c b/drivers/mmc/host/dw_mmc-pci.c
new file mode 100644
index 000000000000..dc0d25a013e0
--- /dev/null
+++ b/drivers/mmc/host/dw_mmc-pci.c
@@ -0,0 +1,158 @@
+/*
+ * Synopsys DesignWare Multimedia Card PCI Interface driver
+ *
+ * Copyright (C) 2012 Vayavya Labs Pvt. Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/dw_mmc.h>
+#include "dw_mmc.h"
+
+#define PCI_BAR_NO 2
+#define COMPLETE_BAR 0
+#define SYNOPSYS_DW_MCI_VENDOR_ID 0x700
+#define SYNOPSYS_DW_MCI_DEVICE_ID 0x1107
+/* Defining the Capabilities */
+#define DW_MCI_CAPABILITIES (MMC_CAP_4_BIT_DATA | MMC_CAP_MMC_HIGHSPEED |\
+				MMC_CAP_SD_HIGHSPEED | MMC_CAP_8_BIT_DATA |\