linux-kernel - Re: [PATCH] thermal/drivers/tsens: Add suspend to RAM support for tsens

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Date: Tue, 27 Feb 2024 21:36:19 +0530
From: Priyansh Jain <quic_priyjain@...cinc.com>
To: Amit Kucheria <amitk@...nel.org>
CC: Konrad Dybcio <konrad.dybcio@...aro.org>,
        Thara Gopinath
	<thara.gopinath@...il.com>,
        Bjorn Andersson <andersson@...nel.org>,
        "Rafael J
 . Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Zhang Rui <rui.zhang@...el.com>, Lukasz Luba <lukasz.luba@....com>,
        <linux-pm@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_manafm@...cinc.com>
Subject: Re: [PATCH] thermal/drivers/tsens: Add suspend to RAM support for
 tsens



On 1/28/2024 1:41 AM, Amit Kucheria wrote:
> On Wed, Jan 24, 2024 at 8:55 PM Priyansh Jain <quic_priyjain@...cinc.com> wrote:
>>
>>
>>
>> On 1/24/2024 6:04 PM, Konrad Dybcio wrote:
>>>
>>>
>>> On 1/24/24 11:42, Priyansh Jain wrote:
> 
>>>>
>>>> As part of suspend to RAM, tsens hardware will be turned off and it
>>>> cannot generate any interrupt.Also system doesn't want to abort
>>>> suspend to RAM due to tsens interrupts since system is already going
>>>> into lowest
>>>> power state. Hence disabling tsens interrupt during suspend to RAM
>>>> callback.
>>>
>>> Is that a hardware limitation, or a software design choice? I'm not
>>> sure I want my phone to have thermal notifications disabled when
>>> it's suspended.
>>
>>> Konrad
>>
>> As part of suspend to RAM , entire SOC will be off, this mode (suspend
>> to RAM) is not intended for Mobile product. Tsens interrupts are not
>> disabled as part of suspend to idle(suspend mode for mobile).
> 
> You should hide the callbacks behind the CONFIG_SUSPEND Kconfig option
> so that it only gets enabled when S2R is enabled.

Yes i will take care of this in next version.

Priyansh