From 8dfd0374be84793360db7fff2e635d2cd3bbcb21 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Thu, 9 Apr 2009 08:32:02 +0200 Subject: 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 --- drivers/mmc/core/core.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'drivers/mmc') 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); -- cgit v1.2.3