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>

diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
index 19246fe..50997d2 100644 (file)
--- 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 e54d6fb..3856669 100644 (file)
--- 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 2de0834..84d1490 100644 (file)
--- 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 */