linux-kernel - Re: [PATCH v7 07/16] clk: tegra: Save/restore CCLKG_BURST

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Date:	Thu, 12 Feb 2015 16:24:40 +0200
From:	Peter De Schrijver <pdeschrijver@...dia.com>
To:	Mikko Perttunen <mikko.perttunen@...si.fi>
CC:	<swarren@...dotorg.org>, <thierry.reding@...il.com>,
	<gnurou@...il.com>, <rjw@...ysocki.net>, <viresh.kumar@...aro.org>,
	<mturquette@...aro.org>, <pwalmsley@...dia.com>,
	<vinceh@...dia.com>, <pgaikwad@...dia.com>,
	<linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<linux-tegra@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <tuomas.tynkkynen@....fi>,
	Tuomas Tynkkynen <ttynkkynen@...dia.com>
Subject: Re: [PATCH v7 07/16] clk: tegra: Save/restore CCLKG_BURST_POLICY on
 suspend

On Thu, Jan 08, 2015 at 03:22:10PM +0200, Mikko Perttunen wrote:
> From: Tuomas Tynkkynen <ttynkkynen@...dia.com>
> 
> Save and restore this register since the LP1 restore assembly routines
> fiddle with it. Otherwise the CPU would keep running on PLLX after
> resume from suspend even when DFLL was the original clocksource.
> 
> Signed-off-by: Tuomas Tynkkynen <ttynkkynen@...dia.com>
> Signed-off-by: Mikko Perttunen <mikko.perttunen@...si.fi>
Acked-By: Peter De Schrijver <pdeschrijver@...dia.com>

> ---
>  drivers/clk/tegra/clk-tegra124.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/clk/tegra/clk-tegra124.c b/drivers/clk/tegra/clk-tegra124.c
> index 623b77f..9354c42 100644
> --- a/drivers/clk/tegra/clk-tegra124.c
> +++ b/drivers/clk/tegra/clk-tegra124.c
> @@ -89,6 +89,8 @@
>  #define PMC_PLLM_WB0_OVERRIDE 0x1dc
>  #define PMC_PLLM_WB0_OVERRIDE_2 0x2b0
>  
> +#define CCLKG_BURST_POLICY 0x368
> +
>  #define UTMIP_PLL_CFG2 0x488
>  #define UTMIP_PLL_CFG2_STABLE_COUNT(x) (((x) & 0xffff) << 6)
>  #define UTMIP_PLL_CFG2_ACTIVE_DLY_COUNT(x) (((x) & 0x3f) << 18)
> @@ -121,6 +123,8 @@
>  #ifdef CONFIG_PM_SLEEP
>  static struct cpu_clk_suspend_context {
>  	u32 clk_csite_src;
> +	u32 cclkg_burst;
> +	u32 cclkg_divider;
>  } tegra124_cpu_clk_sctx;
>  #endif
>  
> @@ -1331,12 +1335,22 @@ static void tegra124_cpu_clock_suspend(void)
>  	tegra124_cpu_clk_sctx.clk_csite_src =
>  				readl(clk_base + CLK_SOURCE_CSITE);
>  	writel(3 << 30, clk_base + CLK_SOURCE_CSITE);
> +
> +	tegra124_cpu_clk_sctx.cclkg_burst =
> +				readl(clk_base + CCLKG_BURST_POLICY);
> +	tegra124_cpu_clk_sctx.cclkg_divider =
> +				readl(clk_base + CCLKG_BURST_POLICY + 4);
>  }
>  
>  static void tegra124_cpu_clock_resume(void)
>  {
>  	writel(tegra124_cpu_clk_sctx.clk_csite_src,
>  				clk_base + CLK_SOURCE_CSITE);
> +
> +	writel(tegra124_cpu_clk_sctx.cclkg_burst,
> +					clk_base + CCLKG_BURST_POLICY);
> +	writel(tegra124_cpu_clk_sctx.cclkg_divider,
> +					clk_base + CCLKG_BURST_POLICY + 4);
>  }
>  #endif
>  
> -- 
> 2.2.1
> 
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