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omap_hsmmc: Wait for SDBP 

It is necessary to wait for bus power before sending
any commands.

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Adrian Hunter 2009-03-12 17:08:26 +02:00 committed by Pierre Ossman
parent f3e2f1dd3b
commit e13bb3003a
1 changed files with 15 additions and 5 deletions
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20
drivers/mmc/host/omap_hsmmc.c
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@ -498,6 +498,19 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
return IRQ_HANDLED;
}
static void set_sd_bus_power(struct mmc_omap_host *host)
{
unsigned long i;
OMAP_HSMMC_WRITE(host->base, HCTL,
OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
for (i = 0; i < loops_per_jiffy; i++) {
if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP)
break;
cpu_relax();
}
}
/*
* Switch MMC interface voltage ... only relevant for MMC1.
*
@ -554,9 +567,7 @@ static int omap_mmc_switch_opcond(struct mmc_omap_host *host, int vdd)
reg_val |= SDVS30;
OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
OMAP_HSMMC_WRITE(host->base, HCTL,
OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
set_sd_bus_power(host);
return 0;
err:
@ -942,8 +953,7 @@ static void omap_hsmmc_init(struct mmc_omap_host *host)
OMAP_HSMMC_WRITE(host->base, SYSCONFIG, value | AUTOIDLE);
/* Set SD bus power bit */
value = OMAP_HSMMC_READ(host->base, HCTL);
OMAP_HSMMC_WRITE(host->base, HCTL, value | SDBP);
set_sd_bus_power(host);
}
static struct mmc_host_ops mmc_omap_ops = {