linux-kernel - Re: [PATCH v2 2/2] omap_twl: Prevent SR to enable for am3517/am3505 devices

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Date:	Thu, 25 Aug 2011 17:01:58 +0200
From:	Matthieu CASTET <matthieu.castet@...rot.com>
To:	Abhilash K V <abhilash.kv@...com>
CC:	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"paul@...an.com" <paul@...an.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"b-cousson@...com" <b-cousson@...com>,
	"tony@...mide.com" <tony@...mide.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Vaibhav Hiremath <hvaibhav@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 2/2] omap_twl: Prevent SR to enable for am3517/am3505
 devices

Abhilash K V a écrit :
> From: Vaibhav Hiremath <hvaibhav@...com>
> 
> In case of AM3517 & AM3505, Smart Reflex is not applicable so
> we must not enable it. So add check for absence of SR feature
> in omap3_twl_init() and return -ENODEV if absence, else continue.

I believe another check should be done :
you have the same problem if you run a omap3630 with TPS65023.

The check should take in account the pmu that is used and if it support SR.


Matthieu


> 
> Signed-off-by: Vaibhav Hiremath <hvaibhav@...com>
> Signed-off-by: Abhilash K V <abhilash.kv@...com>
> ---
>  arch/arm/mach-omap2/id.c              |    2 +-
>  arch/arm/mach-omap2/omap_twl.c        |    8 ++++++++
>  arch/arm/plat-omap/include/plat/cpu.h |    2 ++
>  3 files changed, 11 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
> index 37efb86..da71098 100644
> --- a/arch/arm/mach-omap2/id.c
> +++ b/arch/arm/mach-omap2/id.c
> @@ -202,7 +202,7 @@ static void __init omap3_check_features(void)
>  	if (cpu_is_omap3630())
>  		omap_features |= OMAP3_HAS_192MHZ_CLK;
>  	if (!cpu_is_omap3505() && !cpu_is_omap3517())
> -		omap_features |= OMAP3_HAS_IO_WAKEUP;
> +		omap_features |= (OMAP3_HAS_IO_WAKEUP | OMAP3_HAS_SR);
>  
>  	omap_features |= OMAP3_HAS_SDRC;
>  
> diff --git a/arch/arm/mach-omap2/omap_twl.c b/arch/arm/mach-omap2/omap_twl.c
> index 07d6140..47e27b5 100644
> --- a/arch/arm/mach-omap2/omap_twl.c
> +++ b/arch/arm/mach-omap2/omap_twl.c
> @@ -269,6 +269,14 @@ int __init omap3_twl_init(void)
>  	if (!cpu_is_omap34xx())
>  		return -ENODEV;
>  
> +	/*
> +	 * In case of AM3517/AM3505 we should not be going down
> +	 * further, since SR is not applicable there.
> +	 */
> +	if (!omap3_has_sr()) {
> +		return -ENODEV;
> +	}
> +
>  	if (cpu_is_omap3630()) {
>  		omap3_mpu_volt_info.vp_vddmin = OMAP3630_VP1_VLIMITTO_VDDMIN;
>  		omap3_mpu_volt_info.vp_vddmax = OMAP3630_VP1_VLIMITTO_VDDMAX;
> diff --git a/arch/arm/plat-omap/include/plat/cpu.h b/arch/arm/plat-omap/include/plat/cpu.h
> index 67b3d75..294e015 100644
> --- a/arch/arm/plat-omap/include/plat/cpu.h
> +++ b/arch/arm/plat-omap/include/plat/cpu.h
> @@ -491,6 +491,7 @@ extern u32 omap_features;
>  #define OMAP4_HAS_MPU_1GHZ		BIT(8)
>  #define OMAP4_HAS_MPU_1_2GHZ		BIT(9)
>  #define OMAP4_HAS_MPU_1_5GHZ		BIT(10)
> +#define OMAP3_HAS_SR			BIT(11)
>  
>  
>  #define OMAP3_HAS_FEATURE(feat,flag)			\
> @@ -507,6 +508,7 @@ OMAP3_HAS_FEATURE(isp, ISP)
>  OMAP3_HAS_FEATURE(192mhz_clk, 192MHZ_CLK)
>  OMAP3_HAS_FEATURE(io_wakeup, IO_WAKEUP)
>  OMAP3_HAS_FEATURE(sdrc, SDRC)
> +OMAP3_HAS_FEATURE(sr, SR)
>  
>  /*
>   * Runtime detection of OMAP4 features
--
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