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mmc: dw_mmc: Support voltage changes

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For UHS cards we need the ability to switch voltages from 3.3V to
1.8V.  Add support to the dw_mmc driver to handle this.  Note that
dw_mmc needs a little bit of extra code since the interface needs a
special bit programmed to the CMD register while CMD11 is progressing.
This means adding a few extra states to the state machine to track.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Doug Anderson
2014-08-22 19:17:51 +05:30
committed by Ulf Hansson
parent 51da224090
commit 0173055842
3 changed files with 134 additions and 10 deletions
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2
include/linux/mmc/dw_mmc.h
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@@ -26,6 +26,8 @@ enum dw_mci_state {
STATE_DATA_BUSY,
STATE_SENDING_STOP,
STATE_DATA_ERROR,
STATE_SENDING_CMD11,
STATE_WAITING_CMD11_DONE,
};
enum {