linux-kernel - RE: [PATCH 5/5] platform-x86: intel_mid_thermal: turn off thermistor voltage by default

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Message-ID: <4D68720C2E767A4AA6A8796D42C8EB5902FDBA@BGSMSX101.gar.corp.intel.com>
Date:	Fri, 27 Jan 2012 16:27:47 +0000
From:	"R, Durgadoss" <durgadoss.r@...el.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"mjg@...hat.com" <mjg@...hat.com>,
	"platform-driver-x86@...r.kernel.org" 
	<platform-driver-x86@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 5/5] platform-x86: intel_mid_thermal: turn off
 thermistor voltage by default

> -----Original Message-----
> From: platform-driver-x86-owner@...r.kernel.org [mailto:platform-driver-x86-
> owner@...r.kernel.org] On Behalf Of Alan Cox
> Sent: Thursday, January 26, 2012 11:10 PM
> To: mjg@...hat.com; platform-driver-x86@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: [PATCH 5/5] platform-x86: intel_mid_thermal: turn off thermistor
> voltage by default
> 
> From: Mika Westerberg <mika.westerberg@...ux.intel.com>
> 
> Instead of complaining that the voltage is on, we can just ask the MSIC to
> turn the voltage off. This should save some power.
> 
> Voltage for thermistors is turned on when ADC conversion is initiated.

Acked-by: Durgadoss R <durgadoss.r@...el.com>

Thanks,
Durga

> 
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Signed-off-by: Alan Cox <alan@...ux.intel.com>
> ---
> 
>  drivers/platform/x86/intel_mid_thermal.c |    6 ++++--
>  1 files changed, 4 insertions(+), 2 deletions(-)
> 
> 
> diff --git a/drivers/platform/x86/intel_mid_thermal.c
> b/drivers/platform/x86/intel_mid_thermal.c
> index aef4979..a4e56be 100644
> --- a/drivers/platform/x86/intel_mid_thermal.c
> +++ b/drivers/platform/x86/intel_mid_thermal.c
> @@ -360,8 +360,10 @@ static int mid_initialize_adc(struct device *dev)
>  	if (ret)
>  		return ret;
> 
> -	if (data & MSIC_ADCTHERM_MASK)
> -		dev_warn(dev, "ADCTHERM already set");
> +	data &= ~MSIC_ADCTHERM_MASK;
> +	ret = intel_msic_reg_write(INTEL_MSIC_ADC1CNTL3, data);
> +	if (ret)
> +		return ret;
> 
>  	/* Index of the first channel in which the stop bit is set */
>  	channel_index = find_free_channel();
> 
> --
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