linux-kernel - Re: [PATCH] ARM: dts: fix bad merge of display timing node to exynos5250-smdk5250.dts

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Date:	Mon, 08 Apr 2013 21:27:14 +0200
From:	Tomasz Figa <tomasz.figa@...il.com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Doug Anderson <dianders@...omium.org>,
	Kukjin Kim <kgene.kim@...il.com>,
	linux-samsung-soc@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Leela Krishna Amudala <l.krishna@...sung.com>,
	Jingoo Han <jg1.han@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Olof Johansson <olof@...om.net>,
	Rahul Sharma <rahul.sharma@...sung.com>
Subject: Re: [PATCH] ARM: dts: fix bad merge of display timing node to exynos5250-smdk5250.dts

Hi Doug,

On Monday 08 of April 2013 12:21:32 Doug Anderson wrote:
> Kukjin,
> 
> On Mon, Apr 8, 2013 at 11:29 AM, Kukjin Kim <kgene.kim@...il.com> wrote:
> > BTW, if any problems on current for-next, please kindly let me know.
> 
> I usually try to check linux-next at least once a week, but sometimes
> it's more or less often.  At the moment I'm trying to track something
> weird down but it seems like it has some userspace component to it.
> I'll post a separate thread if I find a kernel problem there.
> 
> Aside from the RTC, my biggest problem right now is that reboot
> stopped working at the same time as the common clock.  The
> exynos5_restart() function is essentially behaving as a no-op since
> the clock to the IP block that handles reset has been gated.  :(  The
> bit "CLK_PMU_APBIF" is gated in "CLK_GATE_IP_PERIS". This used to be
> ungated in exynos5_clk_ip_peris_ctrl().
> 
> I'm happy to test a patch that fixes this but I haven't yet had time
> to try to fix it cleanly myself.

Common Clock Framework by default automatically gates unused clocks, just 
like regulator core does with unused regulators. Maybe this is the cause?

There is a CLK_IGNORE_UNUSED flag which disables this behavior for all 
clocks which have it set. Maybe it should be set for the problematic 
clock?

Best regards,
Tomasz

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