linux-kernel - Re: [PATCH] mmc: renesas_sdhi: Fix HS400 on R-Car M3-W+

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Message-ID: <CAMuHMdVAbhjYHaK0GbDHzVVrYA8LRyU83NoQK=QHgd5g40YS9w@mail.gmail.com>
Date:   Fri, 4 Jun 2021 15:18:22 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Takeshi Saito <takeshi.saito.xv@...esas.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Linux MMC List <linux-mmc@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: renesas_sdhi: Fix HS400 on R-Car M3-W+

Hi Wolfram,

On Fri, Jun 4, 2021 at 3:16 PM Wolfram Sang
<wsa+renesas@...g-engineering.com> wrote:
> On Fri, Jun 04, 2021 at 02:59:43PM +0200, Geert Uytterhoeven wrote:
> > R-Car M3-W ES3.0 is marketed as R-Car M3-W+ (R8A77961), and has its own
> > compatible value "renesas,r8a77961".
> >
> > Hence using soc_device_match() with soc_id = "r8a7796" and revision =
> > "ES3.*" does not actually match running on an R-Car M3-W+ SoC.
> >
> > Fix this by matching with soc_id = "r8a77961" instead.
> >
> > Fixes: a38c078fea0b1393 ("mmc: renesas_sdhi: Avoid bad TAP in HS400")
> > Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
>
> Great, thanks for this fix!
>
> > Boot-tested on Salvator-XS with R-Car M3-W+ ES3.0.
> > No difference seen in eMMC/SHHC detection:
>
> You'd need some stress testing plus debug output of the TAPs chosen to
> actually see a difference. However, the patch is obviously correct.
> Testing if soc_id actually matches now is good enough.

FTR, I did check that part.

> Reviewed-by: Wolfram Sang <wsa+renesas@...g-engineering.com>

Thanks!

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds