Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1565677 > unrolled thread

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

Back to article view | Back to linux.kernel

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: [PATCH v3 7/13] mmc: sunxi: Add more debug messages Ulf Hansson <ulf.hansson@linaro.org> - 2017-01-24 09:30 +0100
    Re: [PATCH v3 7/13] mmc: sunxi: Add more debug messages Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-01-25 10:20 +0100

#1565677 — Re: [PATCH v3 7/13] mmc: sunxi: Add more debug messages

On 16 January 2017 at 17:56, Maxime Ripard
<maxime.ripard@free-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@free-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

[toc] | [next] | [standalone]

#1566396

[Multipart message — attachments visible in raw view] — view raw

On Tue, Jan 24, 2017 at 09:22:24AM +0100, Ulf Hansson wrote:
> On 16 January 2017 at 17:56, Maxime Ripard
> <maxime.ripard@free-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@free-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.

Ok, I will change that.

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

[toc] | [prev] | [standalone]

Back to top | Article view | linux.kernel

csiph-web