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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>
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1 changed files with 7 additions and 1 deletions
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@ -708,7 +708,13 @@ static void mmc_power_up(struct mmc_host *host)
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*/
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mmc_delay(10);
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host->ios.clock = host->f_min;
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if (host->f_min > 400000) {
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pr_warning("%s: Minimum clock frequency too high for "
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"identification mode\n", mmc_hostname(host));
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host->ios.clock = host->f_min;
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} else
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host->ios.clock = 400000;
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host->ios.power_mode = MMC_POWER_ON;
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mmc_set_ios(host);
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