1 files changed, 176 insertions, 54 deletions

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 5278ffb20e74..690255c7d4dc 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -48,7 +48,7 @@ static struct workqueue_struct *workqueue;
  * performance cost, and for other reasons may not always be desired.
  * So we allow it it to be disabled.
  */
-int use_spi_crc = 1;
+bool use_spi_crc = 1;
 module_param(use_spi_crc, bool, 0);
 
 /*
@@ -58,9 +58,9 @@ module_param(use_spi_crc, bool, 0);
  * overridden if necessary.
  */
 #ifdef CONFIG_MMC_UNSAFE_RESUME
-int mmc_assume_removable;
+bool mmc_assume_removable;
 #else
-int mmc_assume_removable = 1;
+bool mmc_assume_removable = 1;
 #endif
 EXPORT_SYMBOL(mmc_assume_removable);
 module_param_named(removable, mmc_assume_removable, bool, 0644);
@@ -140,7 +140,7 @@ void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
 			cmd->retries = 0;
 	}
 
-	if (err && cmd->retries) {
+	if (err && cmd->retries && !mmc_card_removed(host->card)) {
 		/*
 		 * Request starter must handle retries - see
 		 * mmc_wait_for_req_done().
@@ -247,6 +247,11 @@ static void __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;
+	}
 	mmc_start_request(host, mrq);
 }
 
@@ -259,7 +264,8 @@ static void mmc_wait_for_req_done(struct mmc_host *host,
 		wait_for_completion(&mrq->completion);
 
 		cmd = mrq->cmd;
-		if (!cmd->error || !cmd->retries)
+		if (!cmd->error || !cmd->retries ||
+		    mmc_card_removed(host->card))
 			break;
 
 		pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
@@ -284,8 +290,11 @@ static void mmc_wait_for_req_done(struct mmc_host *host,
 static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq,
 		 bool is_first_req)
 {
-	if (host->ops->pre_req)
+	if (host->ops->pre_req) {
+		mmc_host_clk_hold(host);
 		host->ops->pre_req(host, mrq, is_first_req);
+		mmc_host_clk_release(host);
+	}
 }
 
 /**
@@ -300,8 +309,11 @@ static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq,
 static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
 			 int err)
 {
-	if (host->ops->post_req)
+	if (host->ops->post_req) {
+		mmc_host_clk_hold(host);
 		host->ops->post_req(host, mrq, err);
+		mmc_host_clk_release(host);
+	}
 }
 
 /**
@@ -529,6 +541,18 @@ void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
 			data->timeout_clks = 0;
 		}
 	}
+
+	/*
+	 * Some cards require longer data read timeout than indicated in CSD.
+	 * Address this by setting the read timeout to a "reasonably high"
+	 * value. For the cards tested, 300ms has proven enough. If necessary,
+	 * this value can be increased if other problematic cards require this.
+	 */
+	if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
+		data->timeout_ns = 300000000;
+		data->timeout_clks = 0;
+	}
+
 	/*
 	 * Some cards need very high timeouts if driven in SPI mode.
 	 * The worst observed timeout was 900ms after writing a
@@ -602,7 +626,9 @@ int mmc_host_enable(struct mmc_host *host)
 		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) {
@@ -622,7 +648,9 @@ static int mmc_host_do_disable(struct mmc_host *host, int lazy)
 		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) {
@@ -1103,6 +1131,10 @@ int mmc_regulator_set_ocr(struct mmc_host *mmc,
 		 * might not allow this operation
 		 */
 		voltage = regulator_get_voltage(supply);
+
+		if (mmc->caps2 & MMC_CAP2_BROKEN_VOLTAGE)
+			min_uV = max_uV = voltage;
+
 		if (voltage < 0)
 			result = voltage;
 		else if (voltage < min_uV || voltage > max_uV)
@@ -1185,8 +1217,11 @@ int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, bool cmd11
 
 	host->ios.signal_voltage = signal_voltage;
 
-	if (host->ops->start_signal_voltage_switch)
+	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);
+	}
 
 	return err;
 }
@@ -1213,6 +1248,48 @@ void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
 	mmc_host_clk_release(host);
 }
 
+static void mmc_poweroff_notify(struct mmc_host *host)
+{
+	struct mmc_card *card;
+	unsigned int timeout;
+	unsigned int notify_type = EXT_CSD_NO_POWER_NOTIFICATION;
+	int err = 0;
+
+	card = host->card;
+	mmc_claim_host(host);
+
+	/*
+	 * Send power notify command only if card
+	 * is mmc and notify state is powered ON
+	 */
+	if (card && mmc_card_mmc(card) &&
+	    (card->poweroff_notify_state == MMC_POWERED_ON)) {
+
+		if (host->power_notify_type == MMC_HOST_PW_NOTIFY_SHORT) {
+			notify_type = EXT_CSD_POWER_OFF_SHORT;
+			timeout = card->ext_csd.generic_cmd6_time;
+			card->poweroff_notify_state = MMC_POWEROFF_SHORT;
+		} else {
+			notify_type = EXT_CSD_POWER_OFF_LONG;
+			timeout = card->ext_csd.power_off_longtime;
+			card->poweroff_notify_state = MMC_POWEROFF_LONG;
+		}
+
+		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+				 EXT_CSD_POWER_OFF_NOTIFICATION,
+				 notify_type, timeout);
+
+		if (err && err != -EBADMSG)
+			pr_err("Device failed to respond within %d poweroff "
+			       "time. Forcefully powering down the device\n",
+			       timeout);
+
+		/* Set the card state to no notification after the poweroff */
+		card->poweroff_notify_state = MMC_NO_POWER_NOTIFICATION;
+	}
+	mmc_release_host(host);
+}
+
 /*
  * Apply power to the MMC stack.  This is a two-stage process.
  * First, we enable power to the card without the clock running.
@@ -1269,41 +1346,27 @@ static void mmc_power_up(struct mmc_host *host)
 
 void mmc_power_off(struct mmc_host *host)
 {
-	struct mmc_card *card;
-	unsigned int notify_type;
-	unsigned int timeout;
-	int err;
-
+	int err = 0;
 	mmc_host_clk_hold(host);
 
-	card = host->card;
 	host->ios.clock = 0;
 	host->ios.vdd = 0;
 
-	if (card && mmc_card_mmc(card) &&
-	    (card->poweroff_notify_state == MMC_POWERED_ON)) {
-
-		if (host->power_notify_type == MMC_HOST_PW_NOTIFY_SHORT) {
-			notify_type = EXT_CSD_POWER_OFF_SHORT;
-			timeout = card->ext_csd.generic_cmd6_time;
-			card->poweroff_notify_state = MMC_POWEROFF_SHORT;
-		} else {
-			notify_type = EXT_CSD_POWER_OFF_LONG;
-			timeout = card->ext_csd.power_off_longtime;
-			card->poweroff_notify_state = MMC_POWEROFF_LONG;
-		}
-
-		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
-				 EXT_CSD_POWER_OFF_NOTIFICATION,
-				 notify_type, timeout);
-
-		if (err && err != -EBADMSG)
-			pr_err("Device failed to respond within %d poweroff "
-			       "time. Forcefully powering down the device\n",
-			       timeout);
+	/*
+	 * For eMMC 4.5 device send AWAKE command before
+	 * POWER_OFF_NOTIFY command, because in sleep state
+	 * eMMC 4.5 devices respond to only RESET and AWAKE cmd
+	 */
+	if (host->card && mmc_card_is_sleep(host->card) &&
+	    host->bus_ops->resume) {
+		err = host->bus_ops->resume(host);
 
-		/* Set the card state to no notification after the poweroff */
-		card->poweroff_notify_state = MMC_NO_POWER_NOTIFICATION;
+		if (!err)
+			mmc_poweroff_notify(host);
+		else
+			pr_warning("%s: error %d during resume "
+				   "(continue with poweroff sequence)\n",
+				   mmc_hostname(host), err);
 	}
 
 	/*
@@ -1434,7 +1497,7 @@ void mmc_detect_change(struct mmc_host *host, unsigned long delay)
 	WARN_ON(host->removed);
 	spin_unlock_irqrestore(&host->lock, flags);
 #endif
-
+	host->detect_change = 1;
 	mmc_schedule_delayed_work(&host->detect, delay);
 }
 
@@ -2027,6 +2090,43 @@ static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
 	return -EIO;
 }
 
+int _mmc_detect_card_removed(struct mmc_host *host)
+{
+	int ret;
+
+	if ((host->caps & MMC_CAP_NONREMOVABLE) || !host->bus_ops->alive)
+		return 0;
+
+	if (!host->card || mmc_card_removed(host->card))
+		return 1;
+
+	ret = host->bus_ops->alive(host);
+	if (ret) {
+		mmc_card_set_removed(host->card);
+		pr_debug("%s: card remove detected\n", mmc_hostname(host));
+	}
+
+	return ret;
+}
+
+int mmc_detect_card_removed(struct mmc_host *host)
+{
+	struct mmc_card *card = host->card;
+
+	WARN_ON(!host->claimed);
+	/*
+	 * 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);
+
+	host->detect_change = 0;
+
+	return _mmc_detect_card_removed(host);
+}
+EXPORT_SYMBOL(mmc_detect_card_removed);
+
 void mmc_rescan(struct work_struct *work)
 {
 	static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
@@ -2047,6 +2147,8 @@ void mmc_rescan(struct work_struct *work)
 	    && !(host->caps & MMC_CAP_NONREMOVABLE))
 		host->bus_ops->detect(host);
 
+	host->detect_change = 0;
+
 	/*
 	 * Let mmc_bus_put() free the bus/bus_ops if we've found that
 	 * the card is no longer present.
@@ -2108,6 +2210,7 @@ void mmc_stop_host(struct mmc_host *host)
 
 	mmc_bus_get(host);
 	if (host->bus_ops && !host->bus_dead) {
+		/* Calling bus_ops->remove() with a claimed host can deadlock */
 		if (host->bus_ops->remove)
 			host->bus_ops->remove(host);
 
@@ -2179,6 +2282,9 @@ int mmc_card_awake(struct mmc_host *host)
 {
 	int err = -ENOSYS;
 
+	if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD)
+		return 0;
+
 	mmc_bus_get(host);
 
 	if (host->bus_ops && !host->bus_dead && host->bus_ops->awake)
@@ -2194,9 +2300,12 @@ int mmc_card_sleep(struct mmc_host *host)
 {
 	int err = -ENOSYS;
 
+	if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD)
+		return 0;
+
 	mmc_bus_get(host);
 
-	if (host->bus_ops && !host->bus_dead && host->bus_ops->awake)
+	if (host->bus_ops && !host->bus_dead && host->bus_ops->sleep)
 		err = host->bus_ops->sleep(host);
 
 	mmc_bus_put(host);
@@ -2248,6 +2357,7 @@ EXPORT_SYMBOL(mmc_flush_cache);
 int mmc_cache_ctrl(struct mmc_host *host, u8 enable)
 {
 	struct mmc_card *card = host->card;
+	unsigned int timeout;
 	int err = 0;
 
 	if (!(host->caps2 & MMC_CAP2_CACHE_CTRL) ||
@@ -2258,16 +2368,18 @@ int mmc_cache_ctrl(struct mmc_host *host, u8 enable)
 			(card->ext_csd.cache_size > 0)) {
 		enable = !!enable;
 
-		if (card->ext_csd.cache_ctrl ^ enable)
+		if (card->ext_csd.cache_ctrl ^ enable) {
+			timeout = enable ? card->ext_csd.generic_cmd6_time : 0;
 			err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
-					EXT_CSD_CACHE_CTRL, enable, 0);
-		if (err)
-			pr_err("%s: cache %s error %d\n",
-					mmc_hostname(card->host),
-					enable ? "on" : "off",
-					err);
-		else
-			card->ext_csd.cache_ctrl = enable;
+					EXT_CSD_CACHE_CTRL, enable, timeout);
+			if (err)
+				pr_err("%s: cache %s error %d\n",
+						mmc_hostname(card->host),
+						enable ? "on" : "off",
+						err);
+			else
+				card->ext_csd.cache_ctrl = enable;
+		}
 	}
 
 	return err;
@@ -2288,7 +2400,13 @@ int mmc_suspend_host(struct mmc_host *host)
 		cancel_delayed_work(&host->disable);
 	cancel_delayed_work(&host->detect);
 	mmc_flush_scheduled_work();
-	err = mmc_cache_ctrl(host, 0);
+	if (mmc_try_claim_host(host)) {
+		err = mmc_cache_ctrl(host, 0);
+		mmc_do_release_host(host);
+	} else {
+		err = -EBUSY;
+	}
+
 	if (err)
 		goto out;
 
@@ -2302,12 +2420,17 @@ int mmc_suspend_host(struct mmc_host *host)
 		 * pre-claim the host.
 		 */
 		if (mmc_try_claim_host(host)) {
-			if (host->bus_ops->suspend)
+			if (host->bus_ops->suspend) {
 				err = host->bus_ops->suspend(host);
+			}
+			mmc_do_release_host(host);
+
 			if (err == -ENOSYS || !host->bus_ops->resume) {
 				/*
 				 * We simply "remove" the card in this case.
-				 * It will be redetected on resume.
+				 * It will be redetected on resume.  (Calling
+				 * bus_ops->remove() with a claimed host can
+				 * deadlock.)
 				 */
 				if (host->bus_ops->remove)
 					host->bus_ops->remove(host);
@@ -2318,7 +2441,6 @@ int mmc_suspend_host(struct mmc_host *host)
 				host->pm_flags = 0;
 				err = 0;
 			}
-			mmc_do_release_host(host);
 		} else {
 			err = -EBUSY;
 		}
@@ -2401,11 +2523,11 @@ int mmc_pm_notify(struct notifier_block *notify_block,
 		if (!host->bus_ops || host->bus_ops->suspend)
 			break;
 
-		mmc_claim_host(host);
-
+		/* Calling bus_ops->remove() with a claimed host can deadlock */
 		if (host->bus_ops->remove)
 			host->bus_ops->remove(host);
 
+		mmc_claim_host(host);
 		mmc_detach_bus(host);
 		mmc_power_off(host);
 		mmc_release_host(host);