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authorPierre Ossman <drzeus@drzeus.cx>2006-06-30 13:22:23 +0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-07-02 19:02:02 +0400
commit7cb2c76fa2251474e42d55b75163c9d7ed11741e (patch)
tree65354e6d46ae68915481a7a3f86fbcbb92c4d803 /drivers
parent146ad66eac836c0b976c98f428d73e1f6a75270d (diff)
downloadlinux-7cb2c76fa2251474e42d55b75163c9d7ed11741e.tar.xz
[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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/mmc/sdhci.c29
1 files changed, 16 insertions, 13 deletions
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index 74912dcac82f..007e825dcb93 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -371,17 +371,17 @@ static void sdhci_finish_data(struct sdhci_host *host)
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 @@ static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
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 @@ static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
{
int div;
u16 clk;
- unsigned long max_jiffies;
+ unsigned long timeout;
if (clock == host->clock)
return;
@@ -511,17 +512,19 @@ static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
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);