Messages in this thread Patch in this message | | | From | Alexandre Belloni <> | Subject | [PATCH] mmc: core: stop trying to switch width when only one bit is supported | Date | Wed, 17 Dec 2014 19:32:06 +0100 |
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mmc_select_bus_width() will try to switch to MMC_BUS_WIDTH_4 even if MMC_CAP_4_BIT_DATA and MMC_CAP_8_BIT_DATA are not set in host->caps. Return as soon as possible when those flags are not set
Fixes: 577fb13199b11d8cd75609183649be4b5561243f (mmc: rework selection of bus speed mode)
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Cc: <stable@vger.kernel.org> # 3.17 --- drivers/mmc/core/mmc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 02ad79229f65..7466ce098e60 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -886,7 +886,7 @@ static int mmc_select_bus_width(struct mmc_card *card) unsigned idx, bus_width = 0; int err = 0; - if (!mmc_can_ext_csd(card) && + if (!mmc_can_ext_csd(card) || !(host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) return 0; -- 2.1.0
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