linux-kernel - Re: [PATCH v2.1 6/8] ACPI: bus: Rework the handling of \_SB.

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Message-ID: <20251223112507.0000250d@huawei.com>
Date: Tue, 23 Dec 2025 11:25:07 +0000
From: Jonathan Cameron <jonathan.cameron@...wei.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
CC: Linux ACPI <linux-acpi@...r.kernel.org>, LKML
	<linux-kernel@...r.kernel.org>, Linux PCI <linux-pci@...r.kernel.org>, Bjorn
 Helgaas <helgaas@...nel.org>, Srinivas Pandruvada
	<srinivas.pandruvada@...ux.intel.com>, Hans de Goede <hansg@...nel.org>,
	Mario Limonciello <mario.limonciello@....com>
Subject: Re: [PATCH v2.1 6/8] ACPI: bus: Rework the handling of \_SB._OSC
 platform features

On Mon, 22 Dec 2025 20:21:19 +0100
"Rafael J. Wysocki" <rafael@...nel.org> wrote:

> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Both acpi_bus_osc_negotiate_platform_control() and
> acpi_bus_osc_negotiate_usb_control() first call acpi_run_osc() to
> evaluate _OSC in "query mode", with OSC_QUERY_ENABLE set in the
> capabilities buffer, and then use the resultant feature mask as
> the input buffer for requesting control of those features by
> calling acpi_run_osc() to evaluate _OSC with OSC_QUERY_ENABLE clear.
> 
> This involves some code duplication and unnecessary memory
> allocations, so introduce a new helper function carrying out an
> _OSC handshake along the lines of the above description in a simpler
> way and update acpi_bus_osc_negotiate_platform_control() to use it.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>