linux-kernel - Re: [PATCH v3 1/4] mmc: core: expose MMC_CAP2

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Date:   Wed, 4 Mar 2020 14:04:53 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Chun-Hung Wu <chun-hung.wu@...iatek.com>
Cc:     Chaotian Jing <chaotian.jing@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Pavel Machek <pavel@....cz>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Pan Bian <bianpan2016@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Allison Randal <allison@...utok.net>,
        Mathieu Malaterre <malat@...ian.org>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Kuohong Wang <kuohong.wang@...iatek.com>,
        Android Kernel Team <kernel-team@...roid.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        DTML <devicetree@...r.kernel.org>, wsd_upstream@...iatek.com,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 1/4] mmc: core: expose MMC_CAP2_CQE* to dt

On Mon, 17 Feb 2020 at 07:56, Chun-Hung Wu <chun-hung.wu@...iatek.com> wrote:
>
> Expose MMC_CAP2_CQE and MMC_CAP2_CQE_DCMD
> to host->caps2 if
> 1. "supports-cqe" is defined in dt and
> 2. "disable-cqe-dcmd" is not defined in dt.

Both of these DT properties are defined as common mmc DT properties,
so the above isn't really correct. Please clarify this.

Moreover, I suggest to update commit message header into "mmc: core:
Extend mmc_of_parse() to parse CQE bindings", as I think it better
describes the change.

>
> Signed-off-by: Chun-Hung Wu <chun-hung.wu@...iatek.com>
> ---
>  drivers/mmc/core/host.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
> index 105b7a7..efb0dbe 100644
> --- a/drivers/mmc/core/host.c
> +++ b/drivers/mmc/core/host.c
> @@ -319,6 +319,14 @@ int mmc_of_parse(struct mmc_host *host)
>                 host->caps2 |= MMC_CAP2_NO_SD;
>         if (device_property_read_bool(dev, "no-mmc"))
>                 host->caps2 |= MMC_CAP2_NO_MMC;
> +       if (device_property_read_bool(dev, "supports-cqe"))
> +               host->caps2 |= MMC_CAP2_CQE;
> +
> +       /* Must be after "supports-cqe" check */
> +       if (!device_property_read_bool(dev, "disable-cqe-dcmd")) {
> +               if (host->caps2 & MMC_CAP2_CQE)

Does it really doesn't matter if we set this cap, even if MMC_CAP2_CQE
isn't set? You can probably skip the check above.

> +                       host->caps2 |= MMC_CAP2_CQE_DCMD;
> +       }
>
>         /* Must be after "non-removable" check */
>         if (device_property_read_u32(dev, "fixed-emmc-driver-type", &drv_type) == 0) {
> --
> 1.9.1

Kind regards
Uffe