linux-kernel - Re: [PATCH v4 0/6] Add MSM8939 SoC support with two devices

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Message-ID: <d8e750ac-aeb7-0d49-5d48-2591727ba4c5@linaro.org>
Date:   Mon, 23 Jan 2023 16:29:23 +0000
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Stephan Gerhold <stephan@...hold.net>
Cc:     agross@...nel.org, andersson@...nel.org, djakov@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        benl@...areup.com, shawn.guo@...aro.org, fabien.parent@...aro.org,
        leo.yan@...aro.org, dmitry.baryshkov@...aro.org
Subject: Re: [PATCH v4 0/6] Add MSM8939 SoC support with two devices

On 23/01/2023 16:21, Konrad Dybcio wrote:
>> Please change it to VDDMX (without _AO). It will most likely not make
>> any difference
> Wouldn't it make wake-on-wifi-with-cpus-off possible?
> (obviously given the wlan chip supports it and can ping
> the cpu etc etc)
> 
> Konrad

WOWLAN is done via SMD not by raising of an interrupt between WCNSS and 
APSS directly and we do hit VDD min with AO in 4.19.

So, so counter-intuitively so long as the SMD interrupt is unmasked in 
suspend - not a specific WCNSS interrupt, we will wake on WLAN.

Its a complete tangent but, the WCNSS firmware has an SMD RPC call 
called "wake-on-wlan" or somesuch which *would* wake the system via 
interrupt but, appears to never have been implemented...

Anyway.

---
bod