[MMC] sdhci: correct register order

The sdhci specification states that some registers must be written to in a
specific order.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index 877226e..4457881 100644 (file)
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -270,16 +270,13 @@ static void sdhci_transfer_pio(struct sdhci_host *host)
 
 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
 {
-       u16 mode;
        u8 count;
        unsigned target_timeout, current_timeout;
 
        WARN_ON(host->data);
 
-       if (data == NULL) {
-               writew(0, host->ioaddr + SDHCI_TRANSFER_MODE);
+       if (data == NULL)
                return;
-       }
 
        DBG("blksz %04x blks %04x flags %08x\n",
                data->blksz, data->blocks, data->flags);
@@ -317,19 +314,6 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
 
        writeb(count, host->ioaddr + SDHCI_TIMEOUT_CONTROL);
 
-       mode = SDHCI_TRNS_BLK_CNT_EN;
-       if (data->blocks > 1)
-               mode |= SDHCI_TRNS_MULTI;
-       if (data->flags & MMC_DATA_READ)
-               mode |= SDHCI_TRNS_READ;
-       if (host->flags & SDHCI_USE_DMA)
-               mode |= SDHCI_TRNS_DMA;
-
-       writew(mode, host->ioaddr + SDHCI_TRANSFER_MODE);
-
-       writew(data->blksz, host->ioaddr + SDHCI_BLOCK_SIZE);
-       writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
-
        if (host->flags & SDHCI_USE_DMA) {
                int count;
 
@@ -347,6 +331,30 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
                host->offset = 0;
                host->remain = host->cur_sg->length;
        }
+
+       writew(data->blksz, host->ioaddr + SDHCI_BLOCK_SIZE);
+       writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
+}
+
+static void sdhci_set_transfer_mode(struct sdhci_host *host,
+       struct mmc_data *data)
+{
+       u16 mode;
+
+       WARN_ON(host->data);
+
+       if (data == NULL)
+               return;
+
+       mode = SDHCI_TRNS_BLK_CNT_EN;
+       if (data->blocks > 1)
+               mode |= SDHCI_TRNS_MULTI;
+       if (data->flags & MMC_DATA_READ)
+               mode |= SDHCI_TRNS_READ;
+       if (host->flags & SDHCI_USE_DMA)
+               mode |= SDHCI_TRNS_DMA;
+
+       writew(mode, host->ioaddr + SDHCI_TRANSFER_MODE);
 }
 
 static void sdhci_finish_data(struct sdhci_host *host)
@@ -447,6 +455,8 @@ static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 
        writel(cmd->arg, host->ioaddr + SDHCI_ARGUMENT);
 
+       sdhci_set_transfer_mode(host, cmd->data);
+
        if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
                printk(KERN_ERR "%s: Unsupported response type! "
                        "Please report this to " BUGMAIL ".\n",