linux-kernel - Re: [PATCH v3 2/13] mmc: sunxi: Gate the clock when rate is 0

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Date:   Tue, 24 Jan 2017 09:14:31 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Andre Przywara <andre.przywara@....com>
Subject: Re: [PATCH v3 2/13] mmc: sunxi: Gate the clock when rate is 0

On 16 January 2017 at 17:56, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> The MMC core assumes that the code will gate the clock when the bus
> frequency is set to 0, which we've been ignoring so far.
>
> Handle that.
>
> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>

Looks good!

Kind regards
Uffe

> ---
>  drivers/mmc/host/sunxi-mmc.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
> index ab4324e6eb74..019f95e8e7c5 100644
> --- a/drivers/mmc/host/sunxi-mmc.c
> +++ b/drivers/mmc/host/sunxi-mmc.c
> @@ -765,6 +765,9 @@ static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host,
>         if (ret)
>                 return ret;
>
> +       if (!ios->clock)
> +               return 0;
> +
>         /* 8 bit DDR requires a higher module clock */
>         if (ios->timing == MMC_TIMING_MMC_DDR52 &&
>             ios->bus_width == MMC_BUS_WIDTH_8)
> @@ -882,7 +885,7 @@ static void sunxi_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>         mmc_writel(host, REG_GCTRL, rval);
>
>         /* set up clock */
> -       if (ios->clock && ios->power_mode) {
> +       if (ios->power_mode) {
>                 host->ferror = sunxi_mmc_clk_set_rate(host, ios);
>                 /* Android code had a usleep_range(50000, 55000); here */
>         }
> --
> git-series 0.8.11