linux-kernel - Re: [PATCH v2] ARM: dts: exynos5420: Add maudio power domain

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Date:	Wed, 11 Feb 2015 08:29:36 +0100
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Kukjin Kim <kgene@...nel.org>
Cc:	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Subject: Re: [PATCH v2] ARM: dts: exynos5420: Add maudio power domain

On pon, 2015-02-09 at 14:57 +0100, Krzysztof Kozlowski wrote:
> Add maudio power domain to Exynos 5420 DTSI file so its state could be
> tracked. This actually won't power down this domain because the pl330
> dmaengine driver (for adma channel) uses IRQ safe runtime PM. Thus the
> patch should not introduce any functional change except of visibility of
> this domain to the system.

I was wrong. There is a functional change during suspend.

The mau domain is powered off after suspending adma device (pl330 dma).
However later clk-exynos-audss receives syscore suspend notification and
tries to save mau clock registers. This results in imprecise abort
because mau power domain is turned off.

I think it is better to drop my patch.

Krzysztof

> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Reviewed-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
> 
> ---
> 
> Changes sinve v1:
> 1. Use generic power domain bindings (suggested by Javier).
> 2. Add Javier's reviewed-by.
> ---
>  arch/arm/boot/dts/exynos5420.dtsi | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/exynos5420.dtsi b/arch/arm/boot/dts/exynos5420.dtsi
> index 9dc2e9773b30..28c4a2f4b991 100644
> --- a/arch/arm/boot/dts/exynos5420.dtsi
> +++ b/arch/arm/boot/dts/exynos5420.dtsi
> @@ -288,6 +288,12 @@
>  			      "pclk1", "clk1", "pclk2", "clk2";
>  	};
>  
> +	mau_pd: power-domain@...440E0 {
> +		compatible = "samsung,exynos4210-pd";
> +		reg = <0x100440E0 0x20>;
> +		#power-domain-cells = <0>;
> +	};
> +
>  	pinctrl_0: pinctrl@...00000 {
>  		compatible = "samsung,exynos5420-pinctrl";
>  		reg = <0x13400000 0x1000>;
> @@ -346,6 +352,7 @@
>  			#dma-cells = <1>;
>  			#dma-channels = <6>;
>  			#dma-requests = <16>;
> +			power-domains = <&mau_pd>;
>  		};
>  
>  		pdma0: pdma@...A0000 {
> @@ -415,6 +422,7 @@
>  		pinctrl-names = "default";
>  		pinctrl-0 = <&i2s0_bus>;
>  		status = "disabled";
> +		power-domains = <&mau_pd>;
>  	};
>  
>  	i2s1: i2s@...60000 {

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