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From:   Mattijs Korpershoek <mkorpershoek@baylibre.com>
To:     Ulf Hansson <ulf.hansson@linaro.org>,
        Fabien Parent <fparent@baylibre.com>,
        Yong Mao <yong.mao@mediatek.com>,
        Chaotian Jing <chaotian.jing@mediatek.com>
Cc:     Matthias Brugger <matthias.bgg@gmail.com>,
        "linux-mmc\@vger.kernel.org" <linux-mmc@vger.kernel.org>,
        "moderated list\:ARM\/Mediatek SoC support" 
        <linux-mediatek@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH] mmc: host: mtk-sd: enable recheck_sdio_irq for MT8516 SoC
In-Reply-To: <CAPDyKFrMwLeuQoFDgXYo_-T_e2AzfqM-rgp3-SgeuC6Qn6rxMA@mail.gmail.com>
References: <20201023122950.60903-1-fparent@baylibre.com> <CAPDyKFrMwLeuQoFDgXYo_-T_e2AzfqM-rgp3-SgeuC6Qn6rxMA@mail.gmail.com>
Date:   Tue, 27 Oct 2020 13:44:08 +0100
Message-ID: <87wnzbg7on.fsf@baylibre.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

Hi Ulf,

Ulf Hansson <ulf.hansson@linaro.org> writes:

> + Yong Mao, Chaotian Jing
>
> On Fri, 23 Oct 2020 at 14:29, Fabien Parent <fparent@baylibre.com> wrote:
>>
>> MT8516 SoC suffers from sometimes losing SDIO IRQs, this makes SDIO
>> devices sometimes unstable. Make use of the new property
>> recheck_sdio_irq to fix the SDIO stability issues on MT8516.
>>
>> Signed-off-by: Fabien Parent <fparent@baylibre.com>
>
> Maybe this is a common problem, thus I am thinking that potentially we
> should enable the workaround for all variants?
Not sure if this is of any help, but: we use the btmtksdio driver on a
MT8183 soc with an Android kernel based on upstream.

With that kernel, we did not to apply this work-around in order to
have a stable bluetooth experience (pairing with a remote controller)

However, on the MT8516 SoC, it's impossible for us to use btmtksdio
without Fabien's fix.

>
> I have looped in Yong Mao (who invented the workaround) and Chaotian
> Jing, to see if they can advise us how to proceed.
>
> In any case, I think we should add a stable tag and a fixes tag.
>
> Kind regards
> Uffe
>
>> ---
>>  drivers/mmc/host/mtk-sd.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
>> index a704745e5882..3dc102eefe49 100644
>> --- a/drivers/mmc/host/mtk-sd.c
>> +++ b/drivers/mmc/host/mtk-sd.c
>> @@ -524,7 +524,7 @@ static const struct mtk_mmc_compatible mt7622_compat = {
>>
>>  static const struct mtk_mmc_compatible mt8516_compat = {
>>         .clk_div_bits = 12,
>> -       .recheck_sdio_irq = false,
>> +       .recheck_sdio_irq = true,
>>         .hs400_tune = false,
>>         .pad_tune_reg = MSDC_PAD_TUNE0,
>>         .async_fifo = true,
>> --
>> 2.28.0
>>
>
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