linux-kernel - Re: [PATCH] clk: exynos5250: Fix parent clock for sclk

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Date:	Tue, 23 Apr 2013 08:59:03 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Tushar Behera <tushar.behera@...aro.org>
Cc:	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Mike Turquette <mturquette@...aro.org>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Olof Johansson <olofj@...omium.org>,
	Patch Tracking <patches@...aro.org>
Subject: Re: [PATCH] clk: exynos5250: Fix parent clock for sclk_mmc{0,1,2,3}

Tushar,

Thanks for tracking this down.

On Mon, Apr 22, 2013 at 11:31 PM, Tushar Behera
<tushar.behera@...aro.org> wrote:
> commit 688f7d8c9fef ("clk: exynos5250: Fix divider values for
> sclk_mmc{0,1,2,3}") incorrectly sets the divider for sclk_mmc{0,1,2,3}
> to fix the wrong clock value. Though this fixed issue with Arndale,
> it created regressions for other boards like Snow.
>
> On Exynos5250, sclk_mmc<n> is generated like below (as per the clock
> names in drivers/clk/samsung/clk-exynos5250.c)
>
> mout_group1_p ==> mout_mmc<n> ==>
>                 div_mmc<n> ==> div_mmc_pre<n> => sclk_mmc<n>
>
> Earlier div_mmc<n> was set as the parent for sclk_mmc<n>, hence
> div_mmc_pre<n> was not getting referred in kernel code and depending
> on its value set during preboot, sclk_mmc<n> value was different for
> various boards.
>
> Setting the correct clock generation path should fix the issues
> reported in above referenced commit. The changes committed during the
> earlier patch has also been reverted here.
>
> Signed-off-by: Tushar Behera <tushar.behera@...aro.org>
> CC: Doug Anderson <dianders@...omium.org>
> ---
> Doug,
>
> Would you please test whether this patch works for Snow?

Yup, it works for me.  I did the basic testing of installing to eMMC
with this and then booting from eMMC.  I saw no errors in the console.

I glanced over the patch and it looks reasonable to me.  :)

Reported-by: Doug Anderson <dianders@...omium.org>
Tested-by: Doug Anderson <dianders@...omium.org>
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