linux-kernel - Re: [PATCH] mmc: mediatek: fix CMD_TA to 2 for MT8173 HS200/HS400 mode

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Date:   Tue, 10 Dec 2019 20:03:39 +0800
From:   Chaotian Jing <chaotian.jing@...iatek.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
CC:     srv_heupstream <srv_heupstream@...iatek.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        Matthias Brugger <matthias.bgg@...il.com>, <hsinyi@...gle.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] mmc: mediatek: fix CMD_TA to 2 for MT8173 HS200/HS400
 mode

On Tue, 2019-12-10 at 10:51 +0100, Ulf Hansson wrote:
> On Wed, 4 Dec 2019 at 08:20, Chaotian Jing <chaotian.jing@...iatek.com> wrote:
> >
> > there is a chance that always get response CRC error after HS200 tuning,
> > the reason is that need set CMD_TA to 2. this modification is only for
> > MT8173.
> >
> > Signed-off-by: Chaotian Jing <chaotian.jing@...iatek.com>
> 
> I have applied this for fixes, however it seems like this should also
> be tagged for stable, right?
> Yes! should be tagged for stable.
> Is there a specific commit this fixes or should we just find the
> version it applies to?
> 
 this patch should be a fix to commit:
1ede5cb88a29bba1aad1b68965c5fc8e00b20ed9
> Kind regards
> Uffe
> 
> 
> 
> > ---
> >  drivers/mmc/host/mtk-sd.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> > index 189e42674d85..010fe29a4888 100644
> > --- a/drivers/mmc/host/mtk-sd.c
> > +++ b/drivers/mmc/host/mtk-sd.c
> > @@ -228,6 +228,7 @@
> >  #define MSDC_PATCH_BIT_SPCPUSH    (0x1 << 29)  /* RW */
> >  #define MSDC_PATCH_BIT_DECRCTMO   (0x1 << 30)  /* RW */
> >
> > +#define MSDC_PATCH_BIT1_CMDTA     (0x7 << 3)    /* RW */
> >  #define MSDC_PATCH_BIT1_STOP_DLY  (0xf << 8)    /* RW */
> >
> >  #define MSDC_PATCH_BIT2_CFGRESP   (0x1 << 15)   /* RW */
> > @@ -1881,6 +1882,7 @@ static int hs400_tune_response(struct mmc_host *mmc, u32 opcode)
> >
> >         /* select EMMC50 PAD CMD tune */
> >         sdr_set_bits(host->base + PAD_CMD_TUNE, BIT(0));
> > +       sdr_set_field(host->base + MSDC_PATCH_BIT1, MSDC_PATCH_BIT1_CMDTA, 2);
> >
> >         if (mmc->ios.timing == MMC_TIMING_MMC_HS200 ||
> >             mmc->ios.timing == MMC_TIMING_UHS_SDR104)
> > --
> > 2.18.0
> 
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek

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