Merge remote-tracking branch 'stable/linux-3.12.y' into sdk-v1.6.x

Signed-off-by: Scott Wood <scottwood@freescale.com>

Conflicts:
	drivers/mmc/card/block.c

2 files changed, 39 insertions, 7 deletions

diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 69e438e..a0752e9 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -589,6 +589,13 @@ static void atmci_timeout_timer(unsigned long data)
 	if (host->mrq->cmd->data) {
 		host->mrq->cmd->data->error = -ETIMEDOUT;
 		host->data = NULL;
+		/*
+		 * With some SDIO modules, sometimes DMA transfer hangs. If
+		 * stop_transfer() is not called then the DMA request is not
+		 * removed, following ones are queued and never computed.
+		 */
+		if (host->state == STATE_DATA_XFER)
+			host->stop_transfer(host);
 	} else {
 		host->mrq->cmd->error = -ETIMEDOUT;
 		host->cmd = NULL;
@@ -1186,11 +1193,22 @@ static void atmci_start_request(struct atmel_mci *host,
 	iflags |= ATMCI_CMDRDY;
 	cmd = mrq->cmd;
 	cmdflags = atmci_prepare_command(slot->mmc, cmd);
-	atmci_send_command(host, cmd, cmdflags);
+
+	/*
+	 * DMA transfer should be started before sending the command to avoid
+	 * unexpected errors especially for read operations in SDIO mode.
+	 * Unfortunately, in PDC mode, command has to be sent before starting
+	 * the transfer.
+	 */
+	if (host->submit_data != &atmci_submit_data_dma)
+		atmci_send_command(host, cmd, cmdflags);
 
 	if (data)
 		host->submit_data(host, data);
 
+	if (host->submit_data == &atmci_submit_data_dma)
+		atmci_send_command(host, cmd, cmdflags);
+
 	if (mrq->stop) {
 		host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop);
 		host->stop_cmdr |= ATMCI_CMDR_STOP_XFER;
@@ -1803,12 +1821,14 @@ static void atmci_tasklet_func(unsigned long priv)
 			if (unlikely(status)) {
 				host->stop_transfer(host);
 				host->data = NULL;
-				if (status & ATMCI_DTOE) {
-					data->error = -ETIMEDOUT;
-				} else if (status & ATMCI_DCRCE) {
-					data->error = -EILSEQ;
-				} else {
-					data->error = -EIO;
+				if (data) {
+					if (status & ATMCI_DTOE) {
+						data->error = -ETIMEDOUT;
+					} else if (status & ATMCI_DCRCE) {
+						data->error = -EILSEQ;
+					} else {
+						data->error = -EIO;
+					}
 				}
 			}
 
diff --git a/drivers/mmc/host/sdhci-pci.c b/drivers/mmc/host/sdhci-pci.c
index d7d6bc8..27ae563 100644
--- a/drivers/mmc/host/sdhci-pci.c
+++ b/drivers/mmc/host/sdhci-pci.c
@@ -59,6 +59,7 @@ struct sdhci_pci_fixes {
 	unsigned int		quirks;
 	unsigned int		quirks2;
 	bool			allow_runtime_pm;
+	bool			own_cd_for_runtime_pm;
 
 	int			(*probe) (struct sdhci_pci_chip *);
 
@@ -290,6 +291,7 @@ static const struct sdhci_pci_fixes sdhci_intel_mrst_hc1_hc2 = {
 static const struct sdhci_pci_fixes sdhci_intel_mfd_sd = {
 	.quirks		= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
 	.allow_runtime_pm = true,
+	.own_cd_for_runtime_pm = true,
 };
 
 static const struct sdhci_pci_fixes sdhci_intel_mfd_sdio = {
@@ -354,6 +356,7 @@ static const struct sdhci_pci_fixes sdhci_intel_byt_sdio = {
 static const struct sdhci_pci_fixes sdhci_intel_byt_sd = {
 	.quirks2	= SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON,
 	.allow_runtime_pm = true,
+	.own_cd_for_runtime_pm = true,
 };
 
 /* O2Micro extra registers */
@@ -1381,6 +1384,15 @@ static struct sdhci_pci_slot *sdhci_pci_probe_slot(
 
 	sdhci_pci_add_own_cd(slot);
 
+	/*
+	 * Check if the chip needs a separate GPIO for card detect to wake up
+	 * from runtime suspend.  If it is not there, don't allow runtime PM.
+	 * Note sdhci_pci_add_own_cd() sets slot->cd_gpio to -EINVAL on failure.
+	 */
+	if (chip->fixes && chip->fixes->own_cd_for_runtime_pm &&
+	    !gpio_is_valid(slot->cd_gpio))
+		chip->allow_runtime_pm = false;
+
 	return slot;
 
 remove: