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mmc: dw_mmc: Dont wait for DRTO on Write RSP error

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Only wait for DRTO on reads, otherwise the driver hangs.

The driver prevents sending CMD12 on response errors like CRCs. According
to the comment this is because some cards have problems with this during
the UHS tuning sequence. Unfortunately this workaround currently also
applies for any command with data. On reads this will set the drto timer,
which then triggers after a while. On writes this will not set any timer
and the tasklet will not be scheduled again.

I cannot test for the UHS workarounds need, but even if so, it should at
most apply to reads. I have observed many hangs when CMD25 response
contained a CRC error. This patch fixes this without touching the actual
UHS tuning workaround.

Signed-off-by: Christian Loehle <cloehle@hyperstone.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/af8f8b8674ba4fcc9a781019e4aeb72c@hyperstone.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Christian Löhle 2021-09-16 05:59:19 +00:00 committed by Ulf Hansson
parent d9972f5310
commit 43592c8736
1 changed files with 2 additions and 1 deletions
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3
drivers/mmc/host/dw_mmc.c
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@ -2086,7 +2086,8 @@ static void dw_mci_tasklet_func(struct tasklet_struct *t)
* delayed. Allowing the transfer to take place
* avoids races and keeps things simple.
*/
if (err != -ETIMEDOUT) {
if (err != -ETIMEDOUT &&
host->dir_status == DW_MCI_RECV_STATUS) {
state = STATE_SENDING_DATA;
continue;
}