diff mbox

[1/4] mmci: use StartBitErr to detect bad connections

Message ID 1309247845-17105-1-git-send-email-linus.walleij@stericsson.com (mailing list archive)
State New, archived
Headers show

Commit Message

Linus Walleij June 28, 2011, 7:57 a.m. UTC 
From: Ulf Hansson <ulf.hansson@stericsson.com>

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>
---
 drivers/mmc/host/mmci.c |    2 ++
 drivers/mmc/host/mmci.h |    5 ++++-
 2 files changed, 6 insertions(+), 1 deletions(-)

Comments

Russell King - ARM Linux July 5, 2011, 11:16 a.m. UTC | #1 
On Tue, Jun 28, 2011 at 09:57:25AM +0200, Linus Walleij wrote:
> 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>

Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
--
To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Russell King - ARM Linux July 6, 2011, 7:45 p.m. UTC | #2 
On Tue, Jul 05, 2011 at 12:16:11PM +0100, Russell King - ARM Linux wrote:
> On Tue, Jun 28, 2011 at 09:57:25AM +0200, Linus Walleij wrote:
> > 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>
> 
> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>

Ok, I've taken this into my fixes branch.
--
To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
diff mbox

Patch

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 7721de9..fe14072 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 bb32e21..2164e8c 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 \