diff options
| author | Adrian Hunter <adrian.hunter@nokia.com> | 2009-03-12 17:08:26 +0200 |
|---|---|---|
| committer | Pierre Ossman <drzeus@drzeus.cx> | 2009-03-24 21:30:07 +0100 |
| commit | e13bb3003a33df8f82cd027f8abfa5cd73f2eec0 (patch) | |
| tree | 4b4b47777c8a8a4243b00131f29f0a3bcf964d6e /drivers | |
| parent | f3e2f1dd3bbe9352654eec8223495d35e1f52af2 (diff) | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/host/omap_hsmmc.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c index 61883093e25..488f222054f 100644 --- a/drivers/mmc/host/omap_hsmmc.c +++ b/drivers/mmc/host/omap_hsmmc.c @@ -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 = { |