linux-kernel - Re: [RFC PATCH 4/4] power: reset: Implement a PSCI SYSTEM

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Message-ID: <6a0ea31d-814b-6745-d301-c1f6dadf9718@quicinc.com>
Date:   Wed, 26 Jul 2023 10:19:01 -0700
From:   Elliot Berman <quic_eberman@...cinc.com>
To:     Pavan Kondeti <quic_pkondeti@...cinc.com>
CC:     Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Sebastian Reichel <sre@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <kernel@...cinc.com>,
        "Satya Durga Srinivasu Prabhala" <quic_satyap@...cinc.com>,
        Melody Olvera <quic_molvera@...cinc.com>,
        Prasad Sodagudi <quic_psodagud@...cinc.com>
Subject: Re: [RFC PATCH 4/4] power: reset: Implement a PSCI SYSTEM_RESET2
 reboot-mode driver



On 7/26/2023 3:41 AM, Pavan Kondeti wrote:
> On Mon, Jul 24, 2023 at 03:30:54PM -0700, Elliot Berman wrote:
>> PSCI implements a restart notifier for architectural defined resets.
>> The SYSTEM_RESET2 allows vendor firmware to define additional reset
>> types which could be mapped to the reboot reason.
>>
>> Implement a driver to wire the reboot-mode framework to make vendor
>> SYSTEM_RESET2 calls on reboot.
>>
>> Signed-off-by: Elliot Berman <quic_eberman@...cinc.com>
> 
> Do we need to skip the PSCI call from the existing PSCI restart notifier
> which gets called after your newly introduced callback from reboot mode
> notifier?
> 

No need, the vendor SYSTEM_RESET2 call shouldn't return if the call worked.

> Thanks,
> Pavan