From mboxrd@z Thu Jan  1 00:00:00 1970
From: mturquette@linaro.org (Mike Turquette)
Date: Fri, 21 Jun 2013 09:16:27 -0700
Subject: [PATCH] clk: Handle CLK_GET_RATE_NOCACHE flag in clk_set_rate()
In-Reply-To: <1371820055-14147-1-git-send-email-s.nawrocki@samsung.com>
References: <1371820055-14147-1-git-send-email-s.nawrocki@samsung.com>
Message-ID: <20130621161627.9136.84494@quantum>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

Quoting Sylwester Nawrocki (2013-06-21 06:07:35)
> If a clock has CLK_GET_RATE_NOCACHE flag set the rate needs to
> be recalculated, rather than referencing the cached value.
> 
> Currently cached clk->rate is compared with new value to see if
> anything needs to be done in clk_set_rate(). This may cause required
> clock controller registers update to not happen when same clock
> frequency value is being set subsequently.
> 
> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

Peter already sent a patch for this:
https://git.linaro.org/gitweb?p=people/mturquette/linux.git;a=commitdiff;h=34e452a152efd25d654b7bc809df429337115b03

Regards,
Mike

> ---
>  drivers/clk/clk.c |    3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index 1144e8c..ffa304e 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -1215,6 +1215,9 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
>         /* prevent racing with updates to the clock topology */
>         clk_prepare_lock();
> 
> +       if (clk->flags & CLK_GET_RATE_NOCACHE)
> +               __clk_recalc_rates(clk, 0);
> +
>         /* bail early if nothing to do */
>         if (rate == clk->rate)
>                 goto out;
> --
> 1.7.9.5