linux-kernel - Re: [PATCH 1/1] clk: exynos5420: Restore GATE_BUS

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Date:	Wed, 08 Apr 2015 11:06:48 +0200
From:	Sylwester Nawrocki <s.nawrocki@...sung.com>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Mike Turquette <mturquette@...aro.org>
Cc:	Tomasz Figa <tomasz.figa@...il.com>, Kukjin Kim <kgene@...nel.org>,
	Olof Johansson <olof@...om.net>,
	Doug Anderson <dianders@...omium.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Kevin Hilman <khilman@...aro.org>,
	Tyler Baker <tyler.baker@...aro.org>,
	Abhilash Kesavan <kesavan.abhilash@...il.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] clk: exynos5420: Restore GATE_BUS_TOP on suspend

Hello,

On 08/04/15 07:34, Javier Martinez Canillas wrote:
> 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>
> Tested-by: Abhilash Kesavan <a.kesavan@...sung.com>
> Acked-by: Tomasz Figa <tomasz.figa@...il.com>
> ---
>  drivers/clk/samsung/clk-exynos5420.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/clk/samsung/clk-exynos5420.c b/drivers/clk/samsung/clk-exynos5420.c
> index 07d666cc6a29..bea4a173eef5 100644
> --- a/drivers/clk/samsung/clk-exynos5420.c
> +++ b/drivers/clk/samsung/clk-exynos5420.c
> @@ -271,6 +271,7 @@ static const struct samsung_clk_reg_dump exynos5420_set_clksrc[] = {
>  	{ .offset = SRC_MASK_PERIC0,		.value = 0x11111110, },
>  	{ .offset = SRC_MASK_PERIC1,		.value = 0x11111100, },
>  	{ .offset = SRC_MASK_ISP,		.value = 0x11111000, },
> +	{ .offset = GATE_BUS_TOP,		.value = 0xffffffff, },
>  	{ .offset = GATE_BUS_DISP1,		.value = 0xffffffff, },
>  	{ .offset = GATE_IP_PERIC,		.value = 0xffffffff, },
>  };

I'm going to tag this patch for inclusion in the stable tree and send
it to Mike or Stephen with other clk/samsung fixes after v4.1-rc1 is
released.

Mike/Stephen, if you're willing to take this patch earlier here is my:

Acked-by: Sylwester Nawrocki <s.nawrocki@...sung.com>

-- 
Thanks,
Sylwester
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