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From:   Chunyan Zhang <zhang.lyra@gmail.com>
Date:   Mon, 27 Aug 2018 19:07:18 +0800
Message-ID: <CAAfSe-s3XvAKo=YtsggVuz0q4S7vFVDnhmpGsKBCMviHQ1o-6w@mail.gmail.com>
Subject: Re: [PATCH V5 06/10] mmc: sdhci: Disable auto-CMD23 if stuff bits is
 set in CMD23 argument
To:     Ulf Hansson <ulf.hansson@linaro.org>
Cc:     Chunyan Zhang <zhang.chunyan@linaro.org>,
        Adrian Hunter <adrian.hunter@intel.com>,
        "linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Orson Zhai <orsonzhai@gmail.com>,
        Baolin Wang <baolin.wang@linaro.org>,
        Billows Wu <billows.wu@unisoc.com>,
        Jason Wu <jason.wu@unisoc.com>
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On 27 August 2018 at 18:07, Ulf Hansson <ulf.hansson@linaro.org> wrote:
> On 23 August 2018 at 14:50, Adrian Hunter <adrian.hunter@intel.com> wrote:
>> On 16/08/18 10:54, Chunyan Zhang wrote:
>>> For version 4.10 and aboves, SDHCI_ARGUMENT2 is also uses to indicate
>>> 32-bit number of blocks, it doesn't support stuff bits in argument of
>>> CMD23, but only block count for the following command (CMD18/25).
>>>
>>> Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
>>> ---
>>>  drivers/mmc/host/sdhci.c | 9 +++++++++
>>>  drivers/mmc/host/sdhci.h | 1 +
>>>  2 files changed, 10 insertions(+)
>>>
>>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>>> index b3328ee..a72ad0d 100644
>>> --- a/drivers/mmc/host/sdhci.c
>>> +++ b/drivers/mmc/host/sdhci.c
>>> @@ -1729,6 +1729,15 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
>>>               }
>>>       }
>>>
>>> +     /*
>>> +      * For version 4.10 and above, ARGUMENT2 register is also used as 32-bit
>>> +      * block count register which don't support stuff bits of CMD23 argument
>>> +      */
>>> +     if (host->version >= SDHCI_SPEC_410 &&
>>> +         mrq->sbc && (mrq->sbc->arg & SDHCI_ARG2_STUFF) &&
>>> +         (host->flags & SDHCI_AUTO_CMD23))
>>> +             host->flags &= ~SDHCI_AUTO_CMD23;
>>
>> I would prefer this be done in sdhci-sprd.c by hooking ->request().  Someone
>> sent a patch recently to export sdhci_request().
>
> Right. So I have picked up the patch you were referring to.
> https://lkml.org/lkml/2018/8/20/140
>
> Chunyan, you may now preferably base your next version on top of my
> mmc tree's next branch.

Ok, will do.

Thanks,
Chunyan

>
> [...]
>
> Kind regards
> Uffe