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Subject[PATCH 05/21] [MMC] Fix sdhci reset timeout
Date
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>
---
drivers/mmc/sdhci.c | 21 +++++++++++++++++----
1 files changed, 17 insertions(+), 4 deletions(-)
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index b68ca02..d904435 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -94,12 +94,27 @@ static void sdhci_dumpregs(struct sdhci_

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_hos
*/
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);
-
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