linux-kernel - Re: [PATCH 15/15] staging: omap-thermal: update clock prepare count

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Date:	Tue, 26 Feb 2013 21:35:23 -0800
From:	Mike Turquette <mturquette@...aro.org>
To:	Eduardo Valentin <eduardo.valentin@...com>,
	<gregkh@...uxfoundation.org>
Cc:	<devel@...verdev.osuosl.org>, <linux-omap@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	Eduardo Valentin <eduardo.valentin@...com>
Subject: Re: [PATCH 15/15] staging: omap-thermal: update clock prepare count

Quoting Eduardo Valentin (2013-02-26 14:53:38)
> This patch changes the clock management code to also update
> the clock prepare counter, this way we won't skip the enable/disable
> operation due to prepare dependencies.
> 
> Signed-off-by: Eduardo Valentin <eduardo.valentin@...com>

Hi Eduardo,

I didn't look through the other patches in this series (or even the
existing driver that is merged).  With that said, I have a question:
does this driver aggressively call clk_enable/clk_disable in call sites
other than those listed in this patch?

If so it might be a good idea to call clk_prepare_enable and
clk_disable_unprepare in those location.  Of course only call it if the
context can sleep (e.g. not an interrupt handler).

If the driver doesn't aggressively call enable/disable elsewhere than
you can disregard my message ;-)

Regards,
Mike

> ---
>  drivers/staging/omap-thermal/omap-bandgap.c |   10 +++++-----
>  1 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/staging/omap-thermal/omap-bandgap.c b/drivers/staging/omap-thermal/omap-bandgap.c
> index 83f74f4..d4a3788 100644
> --- a/drivers/staging/omap-thermal/omap-bandgap.c
> +++ b/drivers/staging/omap-thermal/omap-bandgap.c
> @@ -943,7 +943,7 @@ int omap_bandgap_probe(struct platform_device *pdev)
>  
>         bg_ptr->clk_rate = clk_rate;
>         if (OMAP_BANDGAP_HAS(bg_ptr, CLK_CTRL))
> -               clk_enable(bg_ptr->fclock);
> +               clk_prepare_enable(bg_ptr->fclock);
>  
>  
>         mutex_init(&bg_ptr->bg_mutex);
> @@ -1013,7 +1013,7 @@ int omap_bandgap_probe(struct platform_device *pdev)
>  
>  disable_clk:
>         if (OMAP_BANDGAP_HAS(bg_ptr, CLK_CTRL))
> -               clk_disable(bg_ptr->fclock);
> +               clk_disable_unprepare(bg_ptr->fclock);
>  put_clks:
>         clk_put(bg_ptr->fclock);
>         clk_put(bg_ptr->div_clk);
> @@ -1044,7 +1044,7 @@ int omap_bandgap_remove(struct platform_device *pdev)
>         omap_bandgap_power(bg_ptr, false);
>  
>         if (OMAP_BANDGAP_HAS(bg_ptr, CLK_CTRL))
> -               clk_disable(bg_ptr->fclock);
> +               clk_disable_unprepare(bg_ptr->fclock);
>         clk_put(bg_ptr->fclock);
>         clk_put(bg_ptr->div_clk);
>  
> @@ -1143,7 +1143,7 @@ static int omap_bandgap_suspend(struct device *dev)
>         omap_bandgap_power(bg_ptr, false);
>  
>         if (OMAP_BANDGAP_HAS(bg_ptr, CLK_CTRL))
> -               clk_disable(bg_ptr->fclock);
> +               clk_disable_unprepare(bg_ptr->fclock);
>  
>         return err;
>  }
> @@ -1153,7 +1153,7 @@ static int omap_bandgap_resume(struct device *dev)
>         struct omap_bandgap *bg_ptr = dev_get_drvdata(dev);
>  
>         if (OMAP_BANDGAP_HAS(bg_ptr, CLK_CTRL))
> -               clk_enable(bg_ptr->fclock);
> +               clk_prepare_enable(bg_ptr->fclock);
>  
>         omap_bandgap_power(bg_ptr, true);
>  
> -- 
> 1.7.7.1.488.ge8e1c
> 
> --
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