linux-kernel - Re: [PATCH] mmc: host: mtk-sd: enable recheck_sdio

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Message-ID: <CAPDyKFrMwLeuQoFDgXYo_-T_e2AzfqM-rgp3-SgeuC6Qn6rxMA@mail.gmail.com>
Date:   Tue, 27 Oct 2020 13:11:34 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Fabien Parent <fparent@...libre.com>,
        Yong Mao <yong.mao@...iatek.com>,
        Chaotian Jing <chaotian.jing@...iatek.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Subject: Re: [PATCH] mmc: host: mtk-sd: enable recheck_sdio_irq for MT8516 SoC

+ Yong Mao, Chaotian Jing

On Fri, 23 Oct 2020 at 14:29, Fabien Parent <fparent@...libre.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@...libre.com>

Maybe this is a common problem, thus I am thinking that potentially we
should enable the workaround for all variants?

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
>