From: Sudeep Holla <sudeep.holla@arm.com>
To: Elliot Berman <quic_eberman@quicinc.com>
Cc: Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konrad.dybcio@linaro.org>,
Sudeep Holla <sudeep.holla@arm.com>,
Sebastian Reichel <sre@kernel.org>, Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Conor Dooley <conor+dt@kernel.org>, Vinod Koul <vkoul@kernel.org>,
Andy Yan <andy.yan@rock-chips.com>,
Lorenzo Pieralisi <lpieralisi@kernel.org>,
"Mark Rutland" <mark.rutland@arm.com>,
Bartosz Golaszewski <bartosz.golaszewski@linaro.org>,
Satya Durga Srinivasu Prabhala <quic_satyap@quicinc.com>,
Melody Olvera <quic_molvera@quicinc.com>,
Shivendra Pratap <quic_spratap@quicinc.com>,
<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
Florian Fainelli <florian.fainelli@broadcom.com>,
<linux-pm@vger.kernel.org>, <linux-arm-msm@vger.kernel.org>
Subject: Re: [PATCH v2 0/4] Implement vendor resets for PSCI SYSTEM_RESET2
Date: Tue, 16 Apr 2024 10:35:22 +0100 [thread overview]
Message-ID: <Zh5GWqt2oCNHdF_h@bogus> (raw)
In-Reply-To: <20240414-arm-psci-system_reset2-vendor-reboots-v2-0-da9a055a648f@quicinc.com>
On Sun, Apr 14, 2024 at 12:30:23PM -0700, Elliot Berman wrote:
> The PSCI SYSTEM_RESET2 call allows vendor firmware to define additional
> reset types which could be mapped to the reboot argument.
>
> Setting up reboot on Qualcomm devices can be inconsistent from chipset
> to chipset.
That doesn't sound good. Do you mean PSCI SYSTEM_RESET doesn't work as
expected ? Does it mean it is not conformant to the specification ?
> Generally, there is a PMIC register that gets written to
> decide the reboot type. There is also sometimes a cookie that can be
> written to indicate that the bootloader should behave differently than a
> regular boot. These knobs evolve over product generations and require
> more drivers. Qualcomm firmwares are beginning to expose vendor
> SYSTEM_RESET2 types to simplify driver requirements from Linux.
>
Why can't this be fully userspace driven ? What is the need to keep the
cookie in the DT ?
--
Regards,
Sudeep
next prev parent reply other threads:[~2024-04-16 9:35 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-14 19:30 [PATCH v2 0/4] Implement vendor resets for PSCI SYSTEM_RESET2 Elliot Berman
2024-04-14 19:30 ` [PATCH v2 1/4] dt-bindings: power: reset: Convert mode-.* properties to array Elliot Berman
2024-04-20 0:50 ` Krzysztof Kozlowski
2024-04-14 19:30 ` [PATCH v2 2/4] dt-bindings: arm: Document reboot mode magic Elliot Berman
2024-04-15 19:34 ` Konrad Dybcio
2024-04-16 9:30 ` Sudeep Holla
2024-04-16 12:32 ` Dmitry Baryshkov
2024-04-14 19:30 ` [PATCH v2 3/4] firmware: psci: Read and use vendor reset types Elliot Berman
2024-04-15 19:39 ` Konrad Dybcio
2024-04-14 19:30 ` [PATCH v2 4/4] arm64: dts: qcom: Add PSCI SYSTEM_RESET2 types for qcm6490-idp Elliot Berman
2024-04-14 23:13 ` Dmitry Baryshkov
2024-04-15 0:32 ` Elliot Berman
2024-04-15 19:42 ` Konrad Dybcio
2024-04-16 1:11 ` Elliot Berman
2024-04-16 9:35 ` Sudeep Holla [this message]
2024-04-17 17:50 ` [PATCH v2 0/4] Implement vendor resets for PSCI SYSTEM_RESET2 Florian Fainelli
2024-04-19 12:38 ` Sudeep Holla
2024-05-02 2:21 ` Elliot Berman
2024-04-17 21:54 ` Elliot Berman
2024-04-17 22:01 ` Florian Fainelli
2024-04-18 17:52 ` Elliot Berman
2024-04-19 8:53 ` Sudeep Holla
2024-04-19 23:31 ` Elliot Berman
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