linux-kernel - Re: [PATCH V2 1/2] mmc: mmci: send stop command if sbc error issue

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Message-ID: <f35da2b3-6bd9-59c0-ca09-40c150eb1a9b@st.com>
Date:   Wed, 5 Dec 2018 16:49:44 +0100
From:   Ludovic BARRE <ludovic.barre@...com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
CC:     Rob Herring <robh+dt@...nel.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>
Subject: Re: [PATCH V2 1/2] mmc: mmci: send stop command if sbc error issue



On 12/5/18 3:23 PM, Ulf Hansson wrote:
> On Tue, 20 Nov 2018 at 10:42, Ulf Hansson <ulf.hansson@...aro.org> wrote:
>>
>> On 7 November 2018 at 10:30, Ludovic Barre <ludovic.Barre@...com> wrote:
>>> From: Ludovic Barre <ludovic.barre@...com>
>>>
>>> Refer to "4.15 set block count command" of sd specification:
>>> Host needs to issue CMD12 if any error is detected in
>>> the CMD18 and CMD25 operations.
>>>
>>> In sbc case, the data->stop is fill by framework.
>>>
>>> Signed-off-by: Ludovic Barre <ludovic.barre@...com>
>>> ---
>>>   drivers/mmc/host/mmci.c | 5 ++---
>>>   1 file changed, 2 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
>>> index 82bab35..13fa640 100644
>>> --- a/drivers/mmc/host/mmci.c
>>> +++ b/drivers/mmc/host/mmci.c
>>> @@ -1190,11 +1190,10 @@ mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
>>>                          /* The error clause is handled above, success! */
>>>                          data->bytes_xfered = data->blksz * data->blocks;
>>>
>>> -               if (!data->stop || host->mrq->sbc) {
>>> +               if (!data->stop || (host->mrq->sbc && !data->error))
>>>                          mmci_request_end(host, data->mrq);
>>> -               } else {
>>> +               else
>>>                          mmci_start_command(host, data->stop, 0);
>>
>> This looks correct to me!
>>
>> Although, just wanted to double check that you tested this for a case
>> where we have host->mrq->sbc set and got an error in data->error? I
>> guess it can be tricky, so I was thinking of manually trying to
>> instruct the code, to set an error in data->error, at some point to
>> trigger this code. That would at least give us some confidence that it
>> works as expected.
> 
> I did some manual tests to trigger the error path. As far as I can
> tell, it works as expected and I observes that the core is able to
> recover and re-send the request.
> 
> [...]
> 
> So, I have added my tested-by tag and applied this for next. Thanks!
> 
> In regards to patch2/2 I am awaiting your update.
> 
> Kind regards
> Uffe
>