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mmc_spi: wait more bytes for card response

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Some cards are slower than the standard allows and need more
time to respond to a command. Max. observed number of bytes
was 12.

Signed-off-by: Wolfgang Muees <wolfgang.mues@auerswald.de>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Wolfgang Muees 2009-03-11 14:17:43 +01:00 committed by Pierre Ossman
parent 48881caec4
commit ea15ba5cd7
1 changed files with 4 additions and 1 deletions
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5
drivers/mmc/host/mmc_spi.c
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@ -279,8 +279,11 @@ static int mmc_spi_response_get(struct mmc_spi_host *host,
* so it can always DMA directly into the target buffer.
* It'd probably be better to memcpy() the first chunk and
* avoid extra i/o calls...
*
* Note we check for more than 8 bytes, because in practice,
* some SD cards are slow...
*/
for (i = 2; i < 9; i++) {
for (i = 2; i < 16; i++) {
value = mmc_spi_readbytes(host, 1);
if (value < 0)
goto done;