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

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Date:   Tue, 8 Jun 2021 15:16:23 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Takeshi Saito <takeshi.saito.xv@...esas.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        linux-mmc <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+

On Fri, 4 Jun 2021 at 14:59, Geert Uytterhoeven <geert+renesas@...der.be> 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>

Applied for fixes and by adding a stable tag, thanks!

Kind regards
Uffe


> ---
> Boot-tested on Salvator-XS with R-Car M3-W+ ES3.0.
> No difference seen in eMMC/SHHC detection:
>
>     mmc0: new HS400 MMC card at address 0001
>     mmcblk0: mmc0:0001 BGSD4R 29.1 GiB
>     mmcblk0boot0: mmc0:0001 BGSD4R 31.9 MiB
>     mmcblk0boot1: mmc0:0001 BGSD4R 31.9 MiB
>     mmcblk0rpmb: mmc0:0001 BGSD4R 4.00 MiB, chardev (247:0)
>      mmcblk0: p1
>     mmc1: new ultra high speed SDR104 SDHC card at address aaaa
>     mmcblk1: mmc1:aaaa SL16G 14.8 GiB
>      mmcblk1: p1
>     mmc2: new ultra high speed SDR104 SDHC card at address aaaa
>     mmcblk2: mmc2:aaaa SL32G 29.7 GiB
>      mmcblk2: p1
> ---
>  drivers/mmc/host/renesas_sdhi_core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/renesas_sdhi_core.c b/drivers/mmc/host/renesas_sdhi_core.c
> index 635bf31a67359f10..b719eda6b8619453 100644
> --- a/drivers/mmc/host/renesas_sdhi_core.c
> +++ b/drivers/mmc/host/renesas_sdhi_core.c
> @@ -939,7 +939,7 @@ static const struct soc_device_attribute sdhi_quirks_match[]  = {
>         { .soc_id = "r8a7795", .revision = "ES3.*", .data = &sdhi_quirks_bad_taps2367 },
>         { .soc_id = "r8a7796", .revision = "ES1.[012]", .data = &sdhi_quirks_4tap_nohs400 },
>         { .soc_id = "r8a7796", .revision = "ES1.*", .data = &sdhi_quirks_r8a7796_es13 },
> -       { .soc_id = "r8a7796", .revision = "ES3.*", .data = &sdhi_quirks_bad_taps1357 },
> +       { .soc_id = "r8a77961", .data = &sdhi_quirks_bad_taps1357 },
>         { .soc_id = "r8a77965", .data = &sdhi_quirks_r8a77965 },
>         { .soc_id = "r8a77980", .data = &sdhi_quirks_nohs400 },
>         { .soc_id = "r8a77990", .data = &sdhi_quirks_r8a77990 },
> --
> 2.25.1
>