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

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commit 43592c8736e84025d7a45e61a46c3fa40536a364 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Löhle 2021-09-16 05:59:19 +00:00 committed by Greg Kroah-Hartman
parent 7b24b669d3
commit 823b487cfb
1 changed files with 2 additions and 1 deletions
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3
drivers/mmc/host/dw_mmc.c
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@ -2014,7 +2014,8 @@ static void dw_mci_tasklet_func(unsigned long priv)
* 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;
}