linux-kernel - Re: [PATCH] mmc: dw_mmc: fix card threshold control configuration

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Date:   Mon, 11 Jun 2018 22:17:58 +0800
From:   Shawn Lin <shawn.lin@...k-chips.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Evgeniy Didin <Evgeniy.Didin@...opsys.com>,
        Doug Anderson <dianders@...omium.org>,
        shawn.lin@...k-chips.com, Jaehoon Chung <jh80.chung@...sung.com>,
        Qing Xia <xiaqing17@...ilicon.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: dw_mmc: fix card threshold control configuration

On 2018/6/11 20:20, Ulf Hansson wrote:
> + Shawn Lin, Evgeniy Didin, Doug Andersson
> 
> On 29 May 2018 at 12:38, Qing Xia <xiaqing17@...ilicon.com> wrote:
>> From: x00270170 <xiaqing17@...ilicon.com>
>>
>> Card write threshold control is supposed to be set since controller
>> version 2.80a for data write in HS400 mode and data read in
>> HS200/HS400/SDR104 mode. However the current code returns without
>> configuring it in the case of data writing in HS400 mode.
>> Meanwhile the patch fixes that the current code goes to
>> 'disable' when doing data reading in HS400 mode.
>>

I'm more or less unable to review this, as I don't have 2.80a databook,
nor a such platform to verify it. :(

>> Signed-off-by: Qing Xia <xiaqing17@...ilicon.com>
> 
> This looks good to me. However, it seems like Jaehoon has been busy,
> no response yet.
> 
> I have looped in a few more people to see if they thinks this makes sense.
> 
> Kind regards
> Uffe
> 
>> ---
>>   drivers/mmc/host/dw_mmc.c | 7 ++++---
>>   1 file changed, 4 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
>> index 29a1afa..3ee8f57 100644
>> --- a/drivers/mmc/host/dw_mmc.c
>> +++ b/drivers/mmc/host/dw_mmc.c
>> @@ -1065,8 +1065,8 @@ static void dw_mci_ctrl_thld(struct dw_mci *host, struct mmc_data *data)
>>           * It's used when HS400 mode is enabled.
>>           */
>>          if (data->flags & MMC_DATA_WRITE &&
>> -               !(host->timing != MMC_TIMING_MMC_HS400))
>> -               return;
>> +               host->timing != MMC_TIMING_MMC_HS400)
>> +               goto disable;
>>
>>          if (data->flags & MMC_DATA_WRITE)
>>                  enable = SDMMC_CARD_WR_THR_EN;
>> @@ -1074,7 +1074,8 @@ static void dw_mci_ctrl_thld(struct dw_mci *host, struct mmc_data *data)
>>                  enable = SDMMC_CARD_RD_THR_EN;
>>
>>          if (host->timing != MMC_TIMING_MMC_HS200 &&
>> -           host->timing != MMC_TIMING_UHS_SDR104)
>> +           host->timing != MMC_TIMING_UHS_SDR104 &&
>> +           host->timing != MMC_TIMING_MMC_HS400)
>>                  goto disable;
>>
>>          blksz_depth = blksz / (1 << host->data_shift);
>> --
>> 2.8.1
>>
> 
> 
> 


-- 
Best Regards
Shawn Lin