sdhci: Add SDHCI_QUIRK_NO_MULTIBLOCK quirk

Add quirk to show the controller cannot do multi-block IO.

This is mainly for the Samsung SDHCI controller that currently
cannot manage to do multi-block PIO without timing out.

Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>

3 files changed, 6 insertions, 1 deletions

diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
index 19246fe3d3e2..50997d2a63e7 100644
--- a/drivers/mmc/host/sdhci-s3c.c
+++ b/drivers/mmc/host/sdhci-s3c.c
@@ -329,6 +329,9 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
          * support as well. */
         host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
 
+        /* PIO currently has problems with multi-block IO */
+        host->quirks |= SDHCI_QUIRK_NO_MULTIBLOCK;
+
 #endif /* CONFIG_MMC_SDHCI_S3C_DMA */
 
         /* It seems we do not get an DATA transfer complete on non-busy
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index e54d6fba85e1..3856669aa7e8 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1834,7 +1834,7 @@ int sdhci_add_host(struct sdhci_host *host)
         /*
          * Maximum block count.
          */
-        mmc->max_blk_count = 65535;
+        mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
 
         /*
          * Init tasklets.
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 2de08349c3ca..84d149096f0e 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -226,6 +226,8 @@ struct sdhci_host {
 #define SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET            (1<<19)
 /* Controller has to be forced to use block size of 2048 bytes */
 #define SDHCI_QUIRK_FORCE_BLK_SZ_2048                   (1<<20)
+/* Controller cannot do multi-block transfers */
+#define SDHCI_QUIRK_NO_MULTIBLOCK                       (1<<21)
 
         int                     irq;            /* Device IRQ */
         void __iomem *          ioaddr;         /* Mapped address */