mmc: sdhci: Auto-CMD23 support.

Enables Auto-CMD23 support where available (SDHCI 3.0 controllers)

Signed-off-by: Andrei Warkentin <andreiw@motorola.com>
Tested-by: Arindam Nath <arindam.nath@amd.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index b9ed663..f845fd6 100644 (file)
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -857,7 +857,12 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host,
                 */
                if (!host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD12))
                        mode |= SDHCI_TRNS_AUTO_CMD12;
+               else if (host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
+                       mode |= SDHCI_TRNS_AUTO_CMD23;
+                       sdhci_writel(host, host->mrq->sbc->arg, SDHCI_ARGUMENT2);
+               }
        }
+
        if (data->flags & MMC_DATA_READ)
                mode |= SDHCI_TRNS_READ;
        if (host->flags & SDHCI_REQ_USE_DMA)
@@ -1252,7 +1257,7 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
                        host->mrq = mrq;
                }
 
-               if (mrq->sbc)
+               if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23))
                        sdhci_send_command(host, mrq->sbc);
                else
                        sdhci_send_command(host, mrq->cmd);
@@ -2488,6 +2493,16 @@ int sdhci_add_host(struct sdhci_host *host)
        if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
                host->flags |= SDHCI_AUTO_CMD12;
 
+       /* Auto-CMD23 stuff only works in ADMA or PIO. */
+       if ((host->version == SDHCI_SPEC_300) &&
+           ((host->flags & SDHCI_USE_ADMA) ||
+            !(host->flags & SDHCI_REQ_USE_DMA))) {
+               host->flags |= SDHCI_AUTO_CMD23;
+               DBG("%s: Auto-CMD23 available\n", mmc_hostname(mmc));
+       } else {
+               DBG("%s: Auto-CMD23 unavailable\n", mmc_hostname(mmc));
+       }
+
        /*
         * A controller may support 8-bit width, but the board itself
         * might not have the pins brought out.  Boards that support

diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 2c3fbc5..745c42f 100644 (file)
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -25,6 +25,7 @@
  */
 
 #define SDHCI_DMA_ADDRESS      0x00
+#define SDHCI_ARGUMENT2                SDHCI_DMA_ADDRESS
 
 #define SDHCI_BLOCK_SIZE       0x04
 #define  SDHCI_MAKE_BLKSZ(dma, blksz) (((dma & 0x7) << 12) | (blksz & 0xFFF))
@@ -37,6 +38,7 @@
 #define  SDHCI_TRNS_DMA                0x01
 #define  SDHCI_TRNS_BLK_CNT_EN 0x02
 #define  SDHCI_TRNS_AUTO_CMD12 0x04
+#define  SDHCI_TRNS_AUTO_CMD23 0x08
 #define  SDHCI_TRNS_READ       0x10
 #define  SDHCI_TRNS_MULTI      0x20
 

diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index 73e27ba..6a68c4e 100644 (file)
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -114,6 +114,7 @@ struct sdhci_host {
 #define SDHCI_SDR50_NEEDS_TUNING (1<<4)        /* SDR50 needs tuning */
 #define SDHCI_NEEDS_RETUNING   (1<<5)  /* Host needs retuning */
 #define SDHCI_AUTO_CMD12       (1<<6)  /* Auto CMD12 support */
+#define SDHCI_AUTO_CMD23       (1<<7)  /* Auto CMD23 support */
 
        unsigned int version;   /* SDHCI spec. version */