From: Sudeep Holla <sudeep.holla@arm.com>
To: Oza Pawandeep <quic_poza@quicinc.com>
Cc: catalin.marinas@arm.com, will@kernel.org, rafael@kernel.org,
lenb@kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org
Subject: Re: [PATCH v7] cpuidle, ACPI: Evaluate LPI arch_flags for broadcast timer
Date: Mon, 18 Sep 2023 11:52:21 +0100 [thread overview]
Message-ID: <20230918105221.msuwbo2deya6rdim@bogus> (raw)
In-Reply-To: <20230915202511.1452091-1-quic_poza@quicinc.com>
On Fri, Sep 15, 2023 at 01:25:11PM -0700, Oza Pawandeep wrote:
> Arm® Functional Fixed Hardware Specification defines LPI states,
> which provide an architectural context loss flags field that can
> be used to describe the context that might be lost when an LPI
> state is entered.
>
> - Core context Lost
> - General purpose registers.
> - Floating point and SIMD registers.
> - System registers, include the System register based
> - generic timer for the core.
> - Debug register in the core power domain.
> - PMU registers in the core power domain.
> - Trace register in the core power domain.
> - Trace context loss
> - GICR
> - GICD
>
> Qualcomm's custom CPUs preserves the architectural state,
> including keeping the power domain for local timers active.
> when core is power gated, the local timers are sufficient to
> wake the core up without needing broadcast timer.
>
> The patch fixes the evaluation of cpuidle arch_flags, and moves only to
> broadcast timer if core context lost is defined in ACPI LPI.
>
> Fixes: a36a7fecfe607 ("Add support for Low Power Idle(LPI) states")
> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
> Signed-off-by: Oza Pawandeep <quic_poza@quicinc.com>
> ---
>
> Notes:
> Will/Catalin: Rafael has acked and he prefers to take it via arm64 tree
You need to add the tags received. You have added my review tag but not
the Rafael's Acked-by tag.
--
Regards,
Sudeep
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prev parent reply other threads:[~2023-09-18 10:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-15 20:25 [PATCH v7] cpuidle, ACPI: Evaluate LPI arch_flags for broadcast timer Oza Pawandeep
2023-09-18 10:46 ` Rafael J. Wysocki
2023-09-18 10:52 ` Sudeep Holla [this message]
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