From: Dinh Nguyen <dinguyen@xxxxxxxxxx>
commits [90c2143a8f mmc: dw_mmc: guarantee stop-abort cmd in data errors]
and [e352c813110 mmc: dw_mmc: rework the code related to cmd/data completion]
cause the SD/MMC DMA interface to stop working on Kingston brand SD cards.
---
Hi Seungwon,
I am seeing this error on v3.13 kernel of the dw_mmc driver:
mmc0: problem reading SD Status register.
mmc0: error -110 whilst initialising SD card
I only see this error on a Kingston brand card, although I have heard reports
that it also fails a Samsung card. Also it only fails when with
CONFIG_MMC_DW_IDMAC=y.
The patch below seems to fix it for me. Any chance you have seen this error?
Dinh
---
drivers/mmc/host/dw_mmc.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 7833002..7dcaa30 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -1312,7 +1312,8 @@ static void dw_mci_tasklet_func(unsigned long priv)
if (test_and_clear_bit(EVENT_DATA_ERROR,
&host->pending_events)) {
dw_mci_stop_dma(host);
- send_stop_abort(host, data);
+ if (data->stop)
+ send_stop_abort(host, data);
state = STATE_DATA_ERROR;
break;
}
@@ -1334,6 +1335,11 @@ static void dw_mci_tasklet_func(unsigned long priv)
set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
err = dw_mci_data_complete(host, data);
+ if (!data->stop) {
+ dw_mci_request_end(host, host->mrq);
+ goto unlock;
+ }
+
if (!err) {
if (!data->stop || mrq->sbc) {
if (mrq->sbc)
--
1.7.9.5
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