linux-kernel - Re: [PATCH v2 03/15] mmc: mmci: Don't pretend all variants to have OPENDRAIN bit

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Date:   Wed, 17 Jan 2018 10:33:28 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Patrice CHOTARD <patrice.chotard@...com>
Cc:     Russell King <linux@...linux.org.uk>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 03/15] mmc: mmci: Don't pretend all variants to have
 OPENDRAIN bit

[...]

>  /* Busy detection for the ST Micro variant */
> @@ -1455,16 +1465,13 @@ static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>                                 ~MCI_ST_DATA2DIREN);
>         }
>
> -       if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
> -               if (host->hw_designer != AMBA_VENDOR_ST)
> -                       pwr |= MCI_ROD;
> -               else {
> -                       /*
> -                        * The ST Micro variant use the ROD bit for something
> -                        * else and only has OD (Open Drain).
> -                        */
> -                       pwr |= MCI_OD;
> -               }
> +       if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN &&
> +           host->variant->opendrain) {

A few nitpicks (because I anyway had some comment on patch4):

The above can be written on one line and the brackets isn't needed.

Replace host->variant->opendrain with variant->opendrain. The same
applies to the below change.

> +               /*
> +                * The ST Micro variant use the ROD bit for
> +                * something else and only has OD (Open Drain).
> +                */

I think we can remove this comment, as this information becomes
implicit when we start using the variant data.

> +               pwr |= host->variant->opendrain;
>         }
>
>         /*
> --
> 1.9.1
>

Kind regards
Uffe