From: Vincent Whitchurch vincent.whitchurch@axis.com
[ Upstream commit 25f8203b4be1937c4939bb98623e67dcfd7da4d1 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mmc/host/dw_mmc.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 72ab0623293c..7bfe9ce03944 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -1768,8 +1768,8 @@ static void dw_mci_tasklet_func(unsigned long priv) continue; }
- dw_mci_stop_dma(host); send_stop_abort(host, data); + dw_mci_stop_dma(host); state = STATE_SENDING_STOP; break; } @@ -1793,10 +1793,10 @@ 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); 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; } @@ -1830,10 +1830,10 @@ 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); 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; }