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>
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 90d168a..643818a5 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -184,6 +184,17 @@
{
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)