[MMC] sdhci: fix sdhci reset timeout

The reset register is automatically cleared when the reset has completed.
Hence, we should busy wait and not have a fixed delay.

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 007e825..77b7db2 100644 (file)
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -94,12 +94,27 @@ static void sdhci_dumpregs(struct sdhci_host *host)
 
 static void sdhci_reset(struct sdhci_host *host, u8 mask)
 {
+       unsigned long timeout;
+
        writeb(mask, host->ioaddr + SDHCI_SOFTWARE_RESET);
 
-       if (mask & SDHCI_RESET_ALL) {
+       if (mask & SDHCI_RESET_ALL)
                host->clock = 0;
 
-               mdelay(50);
+       /* Wait max 100 ms */
+       timeout = 100;
+
+       /* hw clears the bit when it's done */
+       while (readb(host->ioaddr + SDHCI_SOFTWARE_RESET) & mask) {
+               if (timeout == 0) {
+                       printk(KERN_ERR "%s: Reset 0x%x never completed. "
+                               "Please report this to " BUGMAIL ".\n",
+                               mmc_hostname(host->mmc), (int)mask);
+                       sdhci_dumpregs(host);
+                       return;
+               }
+               timeout--;
+               mdelay(1);
        }
 }
 
@@ -619,9 +634,7 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
         */
        if (ios->power_mode == MMC_POWER_OFF) {
                writel(0, host->ioaddr + SDHCI_SIGNAL_ENABLE);
-               spin_unlock_irqrestore(&host->lock, flags);
                sdhci_init(host);
-               spin_lock_irqsave(&host->lock, flags);
        }
 
        sdhci_set_clock(host, ios->clock);