openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

mmc_spi: allow higher timeouts for SPI mode 

Some SD cards have very high timeouts in SPI mode.
So adjust the timeouts from theory to practice.

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 14:28:39 +01:00 committed by Pierre Ossman
parent ea15ba5cd7
commit c0c8887157
1 changed files with 15 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/mmc/core/core.c
View File

@ -297,6 +297,21 @@ void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
data->timeout_clks = 0; data->timeout_clks = 0;
} }
} }
/*
* Some cards need very high timeouts if driven in SPI mode.
* The worst observed timeout was 900ms after writing a
* continuous stream of data until the internal logic
* overflowed.
*/
if (mmc_host_is_spi(card->host)) {
if (data->flags & MMC_DATA_WRITE) {
if (data->timeout_ns < 1000000000)
data->timeout_ns = 1000000000; /* 1s */
} else {
if (data->timeout_ns < 100000000)
data->timeout_ns = 100000000; /* 100ms */
}
}
} }
EXPORT_SYMBOL(mmc_set_data_timeout); EXPORT_SYMBOL(mmc_set_data_timeout);