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author | Andrew Gabbasov <andrew_gabbasov@mentor.com> | 2014-12-25 10:22:24 -0600 |
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committer | Pantelis Antoniou <pantelis.antoniou@konsulko.com> | 2015-01-19 17:41:52 +0200 |
commit | bf4770731c1fbd23befb1ffcd0436df2262a3199 (patch) | |
tree | 835d2d6ac10fa3efb9a52a1af47ba96a33959332 /board | |
parent | 9e41a00b572f415bbcc3d8f6fb1c6c541293655b (diff) |
mmc: Avoid redundant switching to 1-bit bus width for MMC cards
If all the commands switching an MMC card to 4- or 8-bit bus width fail,
and the bus width for the controller and the driver is still set
to default 1 bit, there is no need to send one more command to switch
the card to 1-bit bus width. Also, if the card or host controller do not
support wider bus widths, there is no need to send a switch command at all.
However, if one of switch commands succeeds, but the subsequent ext_csd
fields comparison fails, the card should be switched to some other bus width
(next in the list for the loop), or to default 1-bit bus width as a last
resort. That's why it would be incorrect to just remove the 1-bit bus width
case from the list, it should still be processed in some cases.
panto: Minor cosmetic edit removing superfluous parentheses.
Signed-off-by: Andrew Gabbasov <andrew_gabbasov@mentor.com>
Tested-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Diffstat (limited to 'board')
0 files changed, 0 insertions, 0 deletions