linux-kernel - Re: [PATCH 1/3] mmc: tegra: prevent HS200 on Tegra 3

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Date:   Mon, 16 Jul 2018 12:11:14 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Stefan Agner <stefan@...er.ch>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jon Hunter <jonathanh@...dia.com>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        linux-tegra@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] mmc: tegra: prevent HS200 on Tegra 3

On 12 July 2018 at 09:39, Stefan Agner <stefan@...er.ch> wrote:
> The stack assumes that SDHC controller which support SD3.0 (SDR104) do
> support HS200. This is not the case for Tegra 3, which does support SD
> 3.0
> but only supports eMMC spec 4.41.
>
> Use SDHCI_QUIRK2_BROKEN_HS200 to indicate that the controller does not
> support HS200.
>
> Note that commit 156e14b126ff ("mmc: sdhci: fix caps2 for HS200") added
> the tie between SD3.0 (SDR104) and HS200. I don't think that this is
> necessarly true. It is fully legitimate to support SD3.0 and not support
> HS200. The quirk naming suggests something is broken in the controller,
> but this is not the case: The controller simply does not support HS200.
>
> Fixes: 7ad2ed1dfcbe ("mmc: tegra: enable UHS-I modes")
> Signed-off-by: Stefan Agner <stefan@...er.ch>

Thanks, applied all three patches for next!

Kind regards
Uffe

> ---
>  drivers/mmc/host/sdhci-tegra.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
> index 970d38f68939..137df06b9b6e 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -334,7 +334,8 @@ static const struct sdhci_pltfm_data sdhci_tegra30_pdata = {
>                   SDHCI_QUIRK_NO_HISPD_BIT |
>                   SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC |
>                   SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
> -       .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
> +       .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
> +                  SDHCI_QUIRK2_BROKEN_HS200,
>         .ops  = &tegra_sdhci_ops,
>  };
>
> --
> 2.18.0
>
> --
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