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>

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 7721de9..fe14072 100644 (file)
--- 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 (file)
--- 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 \