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authorDavid Brownell <dbrownell@users.sourceforge.net>2008-12-31 09:50:30 -0800
committerPierre Ossman <drzeus@drzeus.cx>2008-12-31 19:27:18 +0100
commitf6e10b865c3ea56bdaa8c6ecfee313b997900dbb (patch)
tree88871cb356ec512e7f4c721b84ea67a69d9543f7
parent9c43df57910bbba540a6cb5c9132302a9ea5f41a (diff)
mmc: warn about voltage mismatches
Get rid of a silent failure mode when the MMC/SD host doesn't support the voltages needed to operate a given card, by adding a warning. A 3.3V host and a 3.0V card, for example, no longer need to mysteriously just not work at all. This isn't the best diagnostic; ideally it would also tell what voltage the card and host support (and not just by dumping the bitmasks). Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
-rw-r--r--drivers/mmc/core/core.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 5f288aeeb72..df6ce4a06cf 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -542,6 +542,8 @@ u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
host->ios.vdd = bit;
mmc_set_ios(host);
} else {
+ pr_warning("%s: host doesn't support card's voltages\n",
+ mmc_hostname(host));
ocr = 0;
}