sdhci: add auto CMD12 support for eSDHC driver

Add auto CMD12 command support for eSDHC driver.  This is needed by P4080
and P1022 for block read/write.  Manual asynchronous CMD12 abort operation
causes protocol violations on these silicons.

Signed-off-by: Jerry Huang <Chang-Ming.Huang@freescale.com>
Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Kumar Gala <galak@gate.crashing.org>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/mmc/host/sdhci-of-core.c b/drivers/mmc/host/sdhci-of-core.c
index a2e9820..dd1bdd1 100644 (file)
--- a/drivers/mmc/host/sdhci-of-core.c
+++ b/drivers/mmc/host/sdhci-of-core.c
@@ -154,6 +154,10 @@ static int __devinit sdhci_of_probe(struct of_device *ofdev,
                host->ops = &sdhci_of_data->ops;
        }
 
+       if (of_get_property(np, "sdhci,auto-cmd12", NULL))
+               host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
+
+
        if (of_get_property(np, "sdhci,1-bit-only", NULL))
                host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
 

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index c86c14a..7855121 100644 (file)
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -818,8 +818,12 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host,
        WARN_ON(!host->data);
 
        mode = SDHCI_TRNS_BLK_CNT_EN;
-       if (data->blocks > 1)
-               mode |= SDHCI_TRNS_MULTI;
+       if (data->blocks > 1) {
+               if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
+                       mode |= SDHCI_TRNS_MULTI | SDHCI_TRNS_ACMD12;
+               else
+                       mode |= SDHCI_TRNS_MULTI;
+       }
        if (data->flags & MMC_DATA_READ)
                mode |= SDHCI_TRNS_READ;
        if (host->flags & SDHCI_REQ_USE_DMA)
@@ -1109,6 +1113,12 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 #ifndef SDHCI_USE_LEDS_CLASS
        sdhci_activate_led(host);
 #endif
+       if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12) {
+               if (mrq->stop) {
+                       mrq->data->stop = NULL;
+                       mrq->stop = NULL;
+               }
+       }
 
        host->mrq = mrq;
 

diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index ff070a3..036cfae 100644 (file)
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -243,6 +243,8 @@ struct sdhci_host {
 #define SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC              (1<<26)
 /* Controller is missing device caps. Use caps provided by host */
 #define SDHCI_QUIRK_MISSING_CAPS                       (1<<27)
+/* Controller uses Auto CMD12 command to stop the transfer */
+#define SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12             (1<<28)
 
        int                     irq;            /* Device IRQ */
        void __iomem *          ioaddr;         /* Mapped address */