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authorHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-10-05 15:16:59 +0200
committerHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-10-05 20:39:21 +0200
commitca55f46e13dd07b029b0a3d64637f983a6627b23 (patch)
tree4451919320800974f1a937fe5ee25552307166a6
parent65e8b083fc8ec303499baa1924ae032d46d29990 (diff)
atmel-mci: Don't overwrite error bits when NOTBUSY is set
After a data error, we wait for the NOTBUSY bit to be set so that we can be sure the data transfer is completely finished. However, when NOTBUSY is set, the interrupt handler copies the contents of SR into data_status, overwriting any error bits we may have detected earlier. To avoid this, initialize data_status to 0 before starting a request, and don't overwrite it unless it still contains 0. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
-rw-r--r--drivers/mmc/host/atmel-mci.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index d45dfa25938..02529af7c74 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -694,6 +694,7 @@ static void atmci_start_request(struct atmel_mci *host,
host->pending_events = 0;
host->completed_events = 0;
+ host->data_status = 0;
if (host->need_reset) {
mci_writel(host, CR, MCI_CR_SWRST);
@@ -1408,7 +1409,8 @@ static irqreturn_t atmci_interrupt(int irq, void *dev_id)
if (pending & MCI_NOTBUSY) {
mci_writel(host, IDR,
ATMCI_DATA_ERROR_FLAGS | MCI_NOTBUSY);
- host->data_status = status;
+ if (!host->data_status)
+ host->data_status = status;
smp_wmb();
atmci_set_pending(host, EVENT_DATA_COMPLETE);
tasklet_schedule(&host->tasklet);