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MMC core: limit minimum initialization frequency to 400kHz

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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>
This commit is contained in:
Sascha Hauer 2009-04-09 08:32:02 +02:00 committed by Pierre Ossman
parent ae628903ab
commit 8dfd0374be
1 changed files with 7 additions and 1 deletions
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8
drivers/mmc/core/core.c
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@ -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);