[MMC] sdhci: fix timeout loops in sdhci
The current timeout loop assume that jiffies are updated. This might not be
the case depending on locks and if the kernel is compiled without preemption.
Change the system to use a counter and fixed delays.
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 74912dc..007e825 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -371,17 +371,17 @@
static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
{
int flags;
- u32 present;
- unsigned long max_jiffies;
+ unsigned long timeout;
WARN_ON(host->cmd);
DBG("Sending cmd (%x)\n", cmd->opcode);
/* Wait max 10 ms */
- max_jiffies = jiffies + (HZ + 99)/100;
- do {
- if (time_after(jiffies, max_jiffies)) {
+ timeout = 10;
+ while (readl(host->ioaddr + SDHCI_PRESENT_STATE) &
+ (SDHCI_CMD_INHIBIT | SDHCI_DATA_INHIBIT)) {
+ if (timeout == 0) {
printk(KERN_ERR "%s: Controller never released "
"inhibit bits. Please report this to "
BUGMAIL ".\n", mmc_hostname(host->mmc));
@@ -390,8 +390,9 @@
tasklet_schedule(&host->finish_tasklet);
return;
}
- present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
- } while (present & (SDHCI_CMD_INHIBIT | SDHCI_DATA_INHIBIT));
+ timeout--;
+ mdelay(1);
+ }
mod_timer(&host->timer, jiffies + 10 * HZ);
@@ -490,7 +491,7 @@
{
int div;
u16 clk;
- unsigned long max_jiffies;
+ unsigned long timeout;
if (clock == host->clock)
return;
@@ -511,17 +512,19 @@
writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
/* Wait max 10 ms */
- max_jiffies = jiffies + (HZ + 99)/100;
- do {
- if (time_after(jiffies, max_jiffies)) {
+ timeout = 10;
+ while (!((clk = readw(host->ioaddr + SDHCI_CLOCK_CONTROL))
+ & SDHCI_CLOCK_INT_STABLE)) {
+ if (timeout == 0) {
printk(KERN_ERR "%s: Internal clock never stabilised. "
"Please report this to " BUGMAIL ".\n",
mmc_hostname(host->mmc));
sdhci_dumpregs(host);
return;
}
- clk = readw(host->ioaddr + SDHCI_CLOCK_CONTROL);
- } while (!(clk & SDHCI_CLOCK_INT_STABLE));
+ timeout--;
+ mdelay(1);
+ }
clk |= SDHCI_CLOCK_CARD_EN;
writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);