linux-kernel - Re: [PATCH v2 09/14] ARM: imx: cpuidle-imx7ulp: Stop mode disallowed when HSRUN

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Date:   Tue, 10 Mar 2020 14:13:29 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     peng.fan@....com
Cc:     s.hauer@...gutronix.de, sboyd@...nel.org, robh+dt@...nel.org,
        viresh.kumar@...aro.org, rjw@...ysocki.net, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, Anson.Huang@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        abel.vesa@....com
Subject: Re: [PATCH v2 09/14] ARM: imx: cpuidle-imx7ulp: Stop mode disallowed
 when HSRUN

On Wed, Feb 19, 2020 at 03:59:52PM +0800, peng.fan@....com wrote:
> From: Peng Fan <peng.fan@....com>
> 
> When cpu runs in HSRUN mode, cpuidle is not allowed to run into
> Stop mode. So add imx7ulp_get_mode to get thr cpu run mode,
> and use WAIT mode instead, when cpu in HSRUN mode.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>

Why do you have cpuidle patches in a series titled as adding cpufreq
support?

Shawn

> ---
>  arch/arm/mach-imx/common.h          |  1 +
>  arch/arm/mach-imx/cpuidle-imx7ulp.c | 14 +++++++++++---
>  arch/arm/mach-imx/pm-imx7ulp.c      | 10 ++++++++++
>  3 files changed, 22 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/mach-imx/common.h b/arch/arm/mach-imx/common.h
> index 5aa5796cff0e..db542da4fe67 100644
> --- a/arch/arm/mach-imx/common.h
> +++ b/arch/arm/mach-imx/common.h
> @@ -104,6 +104,7 @@ void imx6_set_int_mem_clk_lpm(bool enable);
>  void imx6sl_set_wait_clk(bool enter);
>  int imx_mmdc_get_ddr_type(void);
>  int imx7ulp_set_lpm(enum ulp_cpu_pwr_mode mode);
> +u32 imx7ulp_get_mode(void);
>  
>  void imx_cpu_die(unsigned int cpu);
>  int imx_cpu_kill(unsigned int cpu);
> diff --git a/arch/arm/mach-imx/cpuidle-imx7ulp.c b/arch/arm/mach-imx/cpuidle-imx7ulp.c
> index ca86c967d19e..e7009d10b331 100644
> --- a/arch/arm/mach-imx/cpuidle-imx7ulp.c
> +++ b/arch/arm/mach-imx/cpuidle-imx7ulp.c
> @@ -15,10 +15,18 @@
>  static int imx7ulp_enter_wait(struct cpuidle_device *dev,
>  			    struct cpuidle_driver *drv, int index)
>  {
> -	if (index == 1)
> +	u32 mode;
> +
> +	if (index == 1) {
>  		imx7ulp_set_lpm(ULP_PM_WAIT);
> -	else
> -		imx7ulp_set_lpm(ULP_PM_STOP);
> +	} else {
> +		mode = imx7ulp_get_mode();
> +
> +		if (mode == 3)
> +			imx7ulp_set_lpm(ULP_PM_WAIT);
> +		else
> +			imx7ulp_set_lpm(ULP_PM_STOP);
> +	}
>  
>  	cpu_do_idle();
>  
> diff --git a/arch/arm/mach-imx/pm-imx7ulp.c b/arch/arm/mach-imx/pm-imx7ulp.c
> index 393faf1e8382..1410ccfc71bd 100644
> --- a/arch/arm/mach-imx/pm-imx7ulp.c
> +++ b/arch/arm/mach-imx/pm-imx7ulp.c
> @@ -63,6 +63,16 @@ int imx7ulp_set_lpm(enum ulp_cpu_pwr_mode mode)
>  	return 0;
>  }
>  
> +u32 imx7ulp_get_mode(void)
> +{
> +	u32 mode;
> +
> +	mode = readl_relaxed(smc1_base + SMC_PMCTRL) & BM_PMCTRL_RUNM;
> +	mode >>= BP_PMCTRL_RUNM;
> +
> +	return mode;
> +}
> +
>  void __init imx7ulp_pm_init(void)
>  {
>  	struct device_node *np;
> -- 
> 2.16.4
>