linux-kernel - Re: [PATCH v3 7/13] mmc: sunxi: Add more debug messages

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Date:   Tue, 24 Jan 2017 09:22:24 +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 7/13] mmc: sunxi: Add more debug messages

On 16 January 2017 at 17:56, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> Add a bit more debug messages that can be helpful when debugging the clock
> setup.
>
> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> ---
>  drivers/mmc/host/sunxi-mmc.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
> index f0f6922bca8a..40ed287ceb1c 100644
> --- a/drivers/mmc/host/sunxi-mmc.c
> +++ b/drivers/mmc/host/sunxi-mmc.c
> @@ -661,6 +661,9 @@ static int sunxi_mmc_oclk_onoff(struct sunxi_mmc_host *host, u32 oclk_en)
>         unsigned long expire = jiffies + msecs_to_jiffies(750);
>         u32 rval;
>
> +       dev_dbg(mmc_dev(host->mmc), "%sabling the clock\n",
> +               oclk_en ? "en" : "dis");
> +
>         rval = mmc_readl(host, REG_CLKCR);
>         rval &= ~(SDXC_CARD_CLOCK_ON | SDXC_LOW_POWER_ON | SDXC_MASK_DATA0);
>
> @@ -737,6 +740,7 @@ static int sunxi_mmc_clk_set_phase(struct sunxi_mmc_host *host,
>                         index = SDXC_CLK_50M_DDR;
>                 }
>         } else {
> +               dev_dbg(mmc_dev(host->mmc), "Invalid clock... returning\n");
>                 return -EINVAL;
>         }
>
> @@ -753,6 +757,9 @@ static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host,
>         u32 rval, clock = ios->clock;
>         int ret;
>
> +       dev_dbg(mmc_dev(host->mmc), "setting clk to %u (requested %u)\n",
> +               clock, ios->clock);
> +
>

A better option is to update mmc->actual_clock. That value is
available (and the requested value) though the debugFS nodes.

>         ret = sunxi_mmc_oclk_onoff(host, 0);
>         if (ret)
>                 return ret;
> @@ -771,8 +778,7 @@ static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host,
>                         clock, rate);
>                 return rate;
>         }
> -       dev_dbg(mmc_dev(host->mmc), "setting clk to %d, rounded %ld\n",
> -               clock, rate);
> +       dev_dbg(mmc_dev(host->mmc), "Rounded clk to %ld\n", rate);
>

Ditto.

>         /* setting clock rate */
>         ret = clk_set_rate(host->clk_mmc, rate);
> --
> git-series 0.8.11

Kind regards
Uffe