diff options
| author |   Linus Walleij <linus.walleij@stericsson.com> | 2010-01-25 07:14:46 +0100 |
|---|---|---|
| committer |   Russell King <rmk+kernel@arm.linux.org.uk> | 2010-01-27 22:00:47 +0000 |
| commit | f28e8a4d027e4e21c3d0a52706527bb87397bea0 (patch) | |
| tree | 525f7ccaeb6fded440e408b2953d95f8ef937743 /drivers/mmc/host/mmci.c | |
| parent | ARM: 5895/2: Alter name of U300 watchdog resource (diff) | |
| download | linux-dev-f28e8a4d027e4e21c3d0a52706527bb87397bea0.tar.xz linux-dev-f28e8a4d027e4e21c3d0a52706527bb87397bea0.zip | |
ARM: 5896/1: MMCI: work around a hardware bug in U300
In the U300 some hardware bug makes the status flag not come up
signalling a successful write (or anything else, like an error, for
that matter) on write requests. This little quirk makes the writes
work on U300.
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/mmc/host/mmci.c')
| -rw-r--r-- | drivers/mmc/host/mmci.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c index 90d168ad03b6..643818a5ac45 100644 --- a/drivers/mmc/host/mmci.c +++ b/drivers/mmc/host/mmci.c @@ -184,6 +184,17 @@ mmci_data_irq(struct mmci_host *host, struct mmc_data *data, { if (status & MCI_DATABLOCKEND) { host->data_xfered += data->blksz; +#ifdef CONFIG_ARCH_U300 + /* + * On the U300 some signal or other is + * badly routed so that a data write does + * not properly terminate with a MCI_DATAEND + * status flag. This quirk will make writes + * work again. + */ + if (data->flags & MMC_DATA_WRITE) + status |= MCI_DATAEND; +#endif } if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|MCI_RXOVERRUN)) { if (status & MCI_DATACRCFAIL) |