linux-kernel - Re: [PATCH] mmc: dw_mmc: Dont wait for DRTO on Write RSP error

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Date:   Thu, 23 Sep 2021 20:49:35 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Christian Löhle <CLoehle@...erstone.com>
Cc:     "jh80.chung@...sung.com" <jh80.chung@...sung.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: dw_mmc: Dont wait for DRTO on Write RSP error

On Thu, 16 Sept 2021 at 07:59, Christian Löhle <CLoehle@...erstone.com> wrote:
>
> 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 attest 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@...erstone.com>

Applied for next and by adding a stable tag, thanks!

If you don't think we need the stable tag, please tell me.

Kind regards
Uffe


> ---
>  drivers/mmc/host/dw_mmc.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 6578cc64ae9e..22cf13dc799b 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -2081,7 +2081,8 @@ 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;
>                                 }
> --
> 2.32.0
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