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authorLinus Walleij <linus.walleij@linaro.org>2011-06-30 15:10:21 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-07-06 20:46:04 +0100
commit757df746fc5db0020ddab45914617a19d149c252 (patch)
treed6c4d703c89b774c653d4327ed53d4620fbd7d96 /drivers/mmc/host
parent2eb5af44b1d22d7f7b715e0b9a4e516eb4451bf9 (diff)
ARM: 6980/1: mmci: use StartBitErr to detect bad connections
Stresstesting insert/remove of SD-cards can trigger a StartBitErr. This made the driver to hang in forever waiting for a non ocurring data timeout. This bit and interrupt is documented in the original PL180 TRM, just never implemented until now. Signed-off-by: Ulf Hansson <ulf.hansson@stericsson.com> Reviewed-by: Linus Walleij <linus.walleij@stericsson.com> Reviewed-by: Jonas Aberg <jonas.aberg@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/mmc/host')
-rw-r--r--drivers/mmc/host/mmci.c2
-rw-r--r--drivers/mmc/host/mmci.h5
2 files changed, 6 insertions, 1 deletions
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 7721de942c69..fe140724a02e 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -582,6 +582,8 @@ mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
data->error = -EILSEQ;
} else if (status & MCI_DATATIMEOUT) {
data->error = -ETIMEDOUT;
+ } else if (status & MCI_STARTBITERR) {
+ data->error = -ECOMM;
} else if (status & MCI_TXUNDERRUN) {
data->error = -EIO;
} else if (status & MCI_RXOVERRUN) {
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index bb32e21c09db..2164e8c6476c 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -86,6 +86,7 @@
#define MCI_CMDRESPEND (1 << 6)
#define MCI_CMDSENT (1 << 7)
#define MCI_DATAEND (1 << 8)
+#define MCI_STARTBITERR (1 << 9)
#define MCI_DATABLOCKEND (1 << 10)
#define MCI_CMDACTIVE (1 << 11)
#define MCI_TXACTIVE (1 << 12)
@@ -112,6 +113,7 @@
#define MCI_CMDRESPENDCLR (1 << 6)
#define MCI_CMDSENTCLR (1 << 7)
#define MCI_DATAENDCLR (1 << 8)
+#define MCI_STARTBITERRCLR (1 << 9)
#define MCI_DATABLOCKENDCLR (1 << 10)
/* Extended status bits for the ST Micro variants */
#define MCI_ST_SDIOITC (1 << 22)
@@ -127,6 +129,7 @@
#define MCI_CMDRESPENDMASK (1 << 6)
#define MCI_CMDSENTMASK (1 << 7)
#define MCI_DATAENDMASK (1 << 8)
+#define MCI_STARTBITERRMASK (1 << 9)
#define MCI_DATABLOCKENDMASK (1 << 10)
#define MCI_CMDACTIVEMASK (1 << 11)
#define MCI_TXACTIVEMASK (1 << 12)
@@ -150,7 +153,7 @@
#define MCI_IRQENABLE \
(MCI_CMDCRCFAILMASK|MCI_DATACRCFAILMASK|MCI_CMDTIMEOUTMASK| \
MCI_DATATIMEOUTMASK|MCI_TXUNDERRUNMASK|MCI_RXOVERRUNMASK| \
- MCI_CMDRESPENDMASK|MCI_CMDSENTMASK)
+ MCI_CMDRESPENDMASK|MCI_CMDSENTMASK|MCI_STARTBITERRMASK)
/* These interrupts are directed to IRQ1 when two IRQ lines are available */
#define MCI_IRQ1MASK \