linux-kernel - Re: [PATCH v3 2/3] mmc: sdhci-of-arasan: Add DTS property to disable DCMDs.

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Date:   Mon, 25 Mar 2019 14:27:18 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Christoph Muellner <christoph.muellner@...obroma-systems.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Heiko Stuebner <heiko@...ech.de>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Philipp Tomsich <philipp.tomsich@...obroma-systems.com>,
        Michal Simek <michal.simek@...inx.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Douglas Anderson <dianders@...omium.org>,
        Tony Xie <tony.xie@...k-chips.com>,
        Randy Li <ayaka@...lik.info>,
        Vicente Bergas <vicencb@...il.com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Klaus Goger <klaus.goger@...obroma-systems.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>
Subject: Re: [PATCH v3 2/3] mmc: sdhci-of-arasan: Add DTS property to disable DCMDs.

On Fri, 22 Mar 2019 at 12:39, Christoph Muellner
<christoph.muellner@...obroma-systems.com> wrote:
>
> Direct commands (DCMDs) are an optional feature of eMMC 5.1's command
> queue engine (CQE). The Arasan eMMC 5.1 controller uses the CQHCI,
> which exposes a control register bit to enable the feature.
> The current implementation sets this bit unconditionally.
>
> This patch allows to suppress the feature activation,
> by specifying the property disable-cqe-dcmd.
>
> Signed-off-by: Christoph Muellner <christoph.muellner@...obroma-systems.com>
> Signed-off-by: Philipp Tomsich <philipp.tomsich@...obroma-systems.com>
> Acked-by: Adrian Hunter <adrian.hunter@...el.com>

Applied for next, thanks!

Perhaps both patch1 and patch2 should be tagged for stable? Then
please tell me and I can add a tag.

Kind regards
Uffe



> ---
>  drivers/mmc/host/sdhci-of-arasan.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
> index c9e3e050ccc8..88dc3f00a5be 100644
> --- a/drivers/mmc/host/sdhci-of-arasan.c
> +++ b/drivers/mmc/host/sdhci-of-arasan.c
> @@ -832,7 +832,10 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
>                 host->mmc_host_ops.start_signal_voltage_switch =
>                                         sdhci_arasan_voltage_switch;
>                 sdhci_arasan->has_cqe = true;
> -               host->mmc->caps2 |= MMC_CAP2_CQE | MMC_CAP2_CQE_DCMD;
> +               host->mmc->caps2 |= MMC_CAP2_CQE;
> +
> +               if (!of_property_read_bool(np, "disable-cqe-dcmd"))
> +                       host->mmc->caps2 |= MMC_CAP2_CQE_DCMD;
>         }
>
>         ret = sdhci_arasan_add_host(sdhci_arasan);
> --
> 2.11.0
>