diff options
| author | Sascha Hauer <s.hauer@pengutronix.de> | 2009-04-09 08:32:02 +0200 |
|---|---|---|
| committer | Pierre Ossman <pierre@ossman.eu> | 2009-06-13 22:42:57 +0200 |
| commit | 8dfd0374be84793360db7fff2e635d2cd3bbcb21 (patch) | |
| tree | 877fb5d94f27cb6bbfa4244f21906c5fb66d753f /drivers/mmc | |
| parent | sdhci: avoid changing voltage needlessly (diff) | |
| download | linux-8dfd0374be84793360db7fff2e635d2cd3bbcb21.tar.xz linux-8dfd0374be84793360db7fff2e635d2cd3bbcb21.zip | |
MMC core: limit minimum initialization frequency to 400kHz
Some controllers allow a much lower frequency than 400kHz.
Keep the minimum frequency within sensible limits.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/core/core.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 23fb2c39d9ed..d84c880fac84 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -708,7 +708,13 @@ static void mmc_power_up(struct mmc_host *host) */ mmc_delay(10); - host->ios.clock = host->f_min; + if (host->f_min > 400000) { + pr_warning("%s: Minimum clock frequency too high for " + "identification mode\n", mmc_hostname(host)); + host->ios.clock = host->f_min; + } else + host->ios.clock = 400000; + host->ios.power_mode = MMC_POWER_ON; mmc_set_ios(host); |