diff options
| author | Vincent Whitchurch <vincent.whitchurch@axis.com> | 2021-06-30 12:22:32 +0200 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2021-08-04 12:41:20 +0200 |
| commit | 25f8203b4be1937c4939bb98623e67dcfd7da4d1 (patch) | |
| tree | a96c16d9a6244eddfecbfeaaa35f6468db5be0e7 /drivers/mmc/host/dw_mmc.c | |
| parent | c500bee1c5b2f1d59b1081ac879d73268ab0ff17 (diff) | |
| download | lwn-25f8203b4be1937c4939bb98623e67dcfd7da4d1.tar.gz lwn-25f8203b4be1937c4939bb98623e67dcfd7da4d1.zip | |
mmc: dw_mmc: Fix hang on data CRC error
When a Data CRC interrupt is received, the driver disables the DMA, then
sends the stop/abort command and then waits for Data Transfer Over.
However, sometimes, when a data CRC error is received in the middle of a
multi-block write transfer, the Data Transfer Over interrupt is never
received, and the driver hangs and never completes the request.
The driver sets the BMOD.SWR bit (SDMMC_IDMAC_SWRESET) when stopping the
DMA, but according to the manual CMD.STOP_ABORT_CMD should be programmed
"before assertion of SWR". Do these operations in the recommended
order. With this change the Data Transfer Over is always received
correctly in my tests.
Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210630102232.16011-1-vincent.whitchurch@axis.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/dw_mmc.c')
| -rw-r--r-- | drivers/mmc/host/dw_mmc.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index d333130d1531..c3229d8c7041 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -2018,8 +2018,8 @@ static void dw_mci_tasklet_func(struct tasklet_struct *t) continue; } - dw_mci_stop_dma(host); send_stop_abort(host, data); + dw_mci_stop_dma(host); state = STATE_SENDING_STOP; break; } @@ -2043,10 +2043,10 @@ static void dw_mci_tasklet_func(struct tasklet_struct *t) */ if (test_and_clear_bit(EVENT_DATA_ERROR, &host->pending_events)) { - dw_mci_stop_dma(host); if (!(host->data_status & (SDMMC_INT_DRTO | SDMMC_INT_EBE))) send_stop_abort(host, data); + dw_mci_stop_dma(host); state = STATE_DATA_ERROR; break; } @@ -2079,10 +2079,10 @@ static void dw_mci_tasklet_func(struct tasklet_struct *t) */ if (test_and_clear_bit(EVENT_DATA_ERROR, &host->pending_events)) { - dw_mci_stop_dma(host); if (!(host->data_status & (SDMMC_INT_DRTO | SDMMC_INT_EBE))) send_stop_abort(host, data); + dw_mci_stop_dma(host); state = STATE_DATA_ERROR; break; } |