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>
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 23fb2c3..d84c880 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -708,7 +708,13 @@
*/
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);