linux-kernel - Re: [RFC PATCH v3 2/2] clk: exynos5420: Make sure MDMA0 clock is enabled during suspend

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Message-ID: <7hlhi3py9i.fsf@deeprootsystems.com>
Date:	Tue, 07 Apr 2015 11:51:53 -0700
From:	Kevin Hilman <khilman@...nel.org>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc:	Tomasz Figa <tomasz.figa@...il.com>,
	Abhilash Kesavan <kesavan.abhilash@...il.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Mike Turquette <mturquette@...aro.org>,
	Kukjin Kim <kgene@...nel.org>, Olof Johansson <olof@...om.net>,
	Doug Anderson <dianders@...omium.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Tyler Baker <tyler.baker@...aro.org>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	"linux-samsung-soc\@vger.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v3 2/2] clk: exynos5420: Make sure MDMA0 clock is enabled during suspend

Javier Martinez Canillas <javier.martinez@...labora.co.uk> writes:

[...]

> Yes, the following patch [0] is enough to make S2R working. If you think
> that is correct then I'll post it as a proper patch then.

[...]

> [0]
> From 78aa551ebcb9a4a7ae9d5581c33e0c0f19fe5ad6 Mon Sep 17 00:00:00 2001
> From: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
> Date: Tue, 7 Apr 2015 15:53:27 +0200
> Subject: [RFC PATCH] clk: exynos5420: Restore GATE_BUS_TOP on suspend
>
> Commit ae43b3289186 ("ARM: 8202/1: dmaengine: pl330: Add runtime Power
> Management support v12") added pm support for the pl330 dma driver but
> it makes the clock for the Exynos5420 MDMA0 DMA controller to be gated
> during suspend and this in turn makes its parent clock aclk266_g2d to
> be gated. But the clock needs to be ungated prior suspend to allow the
> system to be suspend and resumed correctly.
>
> Add GATE_BUS_TOP register to the list of registers to be restored when
> the system enters into a suspend state so aclk266_g2d will be ungated.
>
> Thanks to Abhilash Kesavan for figuring out that this was the issue.
>
> Fixes: ae43b32 ("ARM: 8202/1: dmaengine: pl330: Add runtime Power Management support v12")
> Signed-off-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>

Tested-by: Kevin Hilman <khilman@...aro.org>

on exynos5800-peach-pi

Kevin
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