From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Sudeep Holla <sudeep.holla@arm.com>
Cc: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-ia64@vger.kernel.org, x86@kernel.org,
Al Stone <al.stone@linaro.org>,
Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>,
Mahesh Sivasubramanian <msivasub@codeaurora.org>,
Ashwin Chaugule <ashwin.chaugule@linaro.org>,
Prashanth Prakash <pprakash@codeaurora.org>
Subject: Re: [PATCH v3 4/5] ACPI / processor_idle : introduce ARCH_SUPPORTS_ACPI_PROCESSOR_CSTATE
Date: Tue, 16 Feb 2016 21:18:36 +0100 [thread overview]
Message-ID: <12469811.iv3SctjXxl@vostro.rjw.lan> (raw)
In-Reply-To: <1449065446-26115-5-git-send-email-sudeep.holla@arm.com>
On Wednesday, December 02, 2015 02:10:45 PM Sudeep Holla wrote:
> ACPI 6.0 adds a new method to specify the CPU idle states(C-states)
> called Low Power Idle(LPI) states. Since new architectures like ARM64
> use only LPIs, introduce ARCH_SUPPORTS_ACPI_PROCESSOR_CSTATE to
> encapsulate all the code supporting the old style C-states(_CST)
No.
The way it really should work is to check if the firmware supports LPI
(and what kind of it) and try to use _CST if LPI is not supported.
If LPI is supported by the firmware, use it if the LPI objects are
present as expected or fall back to using _CST otherwise.
This way it all should work without any new Kconfig options.
Thanks,
Rafael
next prev parent reply other threads:[~2016-02-16 20:17 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-02 14:10 [PATCH v3 0/5] ACPI / processor_idle: Add ACPI v6.0 LPI support Sudeep Holla
2015-12-02 14:10 ` [PATCH v3 1/5] ACPI / processor : add support for ACPI0010 processor container Sudeep Holla
2016-02-16 20:10 ` Rafael J. Wysocki
2016-02-17 11:54 ` Sudeep Holla
2016-02-17 11:54 ` [UPDATE] " Sudeep Holla
2016-02-23 23:41 ` Rafael J. Wysocki
2015-12-02 14:10 ` [PATCH v3 2/5] ACPI / sleep: move acpi_processor_sleep to sleep.c Sudeep Holla
2016-02-16 20:13 ` Rafael J. Wysocki
2016-02-17 12:03 ` Sudeep Holla
2016-02-17 12:03 ` [UPDATE] " Sudeep Holla
2016-02-23 23:42 ` Rafael J. Wysocki
2015-12-02 14:10 ` [PATCH v3 3/5] ACPI / processor_idle: replace PREFIX with pr_fmt Sudeep Holla
2016-02-16 20:15 ` Rafael J. Wysocki
2015-12-02 14:10 ` [PATCH v3 4/5] ACPI / processor_idle : introduce ARCH_SUPPORTS_ACPI_PROCESSOR_CSTATE Sudeep Holla
2016-02-16 20:18 ` Rafael J. Wysocki [this message]
2016-02-17 12:21 ` Sudeep Holla
2016-02-22 13:46 ` Sudeep Holla
2016-02-22 23:28 ` Rafael J. Wysocki
2016-02-23 9:32 ` Sudeep Holla
2015-12-02 14:10 ` [PATCH v3 5/5] ACPI / processor_idle: Add support for Low Power Idle(LPI) states Sudeep Holla
2016-02-16 20:46 ` Rafael J. Wysocki
2016-02-17 16:10 ` Sudeep Holla
2016-04-12 4:06 ` Vikas Sajjan
2016-04-12 14:29 ` Sudeep Holla
2015-12-09 22:52 ` [PATCH v3 0/5] ACPI / processor_idle: Add ACPI v6.0 LPI support Prakash, Prashanth
2015-12-10 8:48 ` Sudeep Holla
2016-01-15 19:13 ` Prakash, Prashanth
2016-01-18 12:15 ` Sudeep Holla
2016-01-18 14:53 ` Rafael J. Wysocki
2016-01-27 18:26 ` Sudeep Holla
2016-02-16 20:08 ` Rafael J. Wysocki
2016-02-17 11:37 ` Sudeep Holla
2016-02-18 2:08 ` Rafael J. Wysocki
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