Commit f6e10b86 authored Dec 31, 2008 by David Brownell Committed by Pierre Ossman Dec 31, 2008

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>

parent 9c43df57

drivers/mmc/core/core.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}