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ARM: 5896/1: MMCI: work around a hardware bug in U300

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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>
This commit is contained in:
Linus Walleij
2010-01-25 07:14:46 +01:00
committed by Russell King
parent 633e81a66b
commit f28e8a4d02
1 changed files with 11 additions and 0 deletions
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11
drivers/mmc/host/mmci.c
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@@ -184,6 +184,17 @@ mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
{ {
if (status & MCI_DATABLOCKEND) { if (status & MCI_DATABLOCKEND) {
host->data_xfered += data->blksz; 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|MCI_DATATIMEOUT|MCI_TXUNDERRUN|MCI_RXOVERRUN)) {
if (status & MCI_DATACRCFAIL) if (status & MCI_DATACRCFAIL)