From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7A77D2C21C3 for ; Thu, 21 Aug 2025 18:26:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755800817; cv=none; b=pJ2pfz/IsNbQ6R6BgHMODtTfpvqBGv7tZxgYjc0OjCFrYS5+/70umr1tsRmKsvxhiFulMZCHs6vcBpPSDLuHb60BpCoJpVDQIIJA8FdgbYYXrJ25h7ZCwenqP4GQxFQ9zif28bkDZHYmHYElEcNB+t85veqOOD+2T0fzh1/pmkg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755800817; c=relaxed/simple; bh=Jns9dM6bNUD2PTcsoWc8SsUsE/eiP0j6c3h0Gkcyqd0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IkTnUdhK8GxQ3nlEMNjZvmBNDdJd86ycrAlnQn3y+o2GTu6ahnW8ANDSZP6HRIjnsjeanPaSzvdbXM3HaqkHrUytGQLSRO2sbKmgM2RSzcJD+XepwxLOogZ6vHIyhVuG3bBB3kb1eg8H35I0I0G5tZ2mFsHSKILOt8L9Pc3gprM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=HGmw+3ZT; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="HGmw+3ZT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74E94C4CEEB; Thu, 21 Aug 2025 18:26:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755800817; bh=Jns9dM6bNUD2PTcsoWc8SsUsE/eiP0j6c3h0Gkcyqd0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HGmw+3ZTYzTklfahCE7bIo53qmzJByejkVtknqhJLwjVVOO5tJKyhsFlNirkCWpch psIMbccRIjpeLQ0v7UPn2A2yMfiPKgCdrqJ6kF539KTl4NO1wEZCekJ5f5Nt84sWuA ORMYsoy09O+1PTvu2mGAUY13yDY1GL01xPc+N2pyZ6/0HQHU6z4ujuPYwulqYX8Jw1 YtuEFdNUBvXkdBwlQrwbH2yuj6trgsfrz0H2cEyTtMXmoxOQQHOvkV9EBgWVscy0p4 dPXv2hHXazyGe6qixryLthd0ch7TYMxWL3g8JZIvAbVglC6OAEpUooke5oWQWUUMH6 Q8iV5brur7fOA== From: Sasha Levin To: stable@vger.kernel.org Cc: Damien Le Moal , Hannes Reinecke , Niklas Cassel , Sasha Levin Subject: [PATCH 5.4.y] ata: Fix SATA_MOBILE_LPM_POLICY description in Kconfig Date: Thu, 21 Aug 2025 14:26:54 -0400 Message-ID: <20250821182654.891907-1-sashal@kernel.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <2025082138-collected-demeaning-2359@gregkh> References: <2025082138-collected-demeaning-2359@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Damien Le Moal [ Upstream commit ed62a62a18bc144f73eadf866ae46842e8f6606e ] Improve the description of the possible default SATA link power management policies and add the missing description for policy 5. No functional changes. Fixes: a5ec5a7bfd1f ("ata: ahci: Support state with min power but Partial low power state") Cc: stable@vger.kernel.org Signed-off-by: Damien Le Moal Reviewed-by: Hannes Reinecke Reviewed-by: Niklas Cassel [ Adjust context ] Signed-off-by: Sasha Levin --- drivers/ata/Kconfig | 35 ++++++++++++++++++++++++++--------- 1 file changed, 26 insertions(+), 9 deletions(-) diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig index a6beb2c5a692..dbde78feda31 100644 --- a/drivers/ata/Kconfig +++ b/drivers/ata/Kconfig @@ -92,22 +92,39 @@ config SATA_AHCI config SATA_MOBILE_LPM_POLICY int "Default SATA Link Power Management policy for mobile chipsets" - range 0 4 + range 0 5 default 0 depends on SATA_AHCI help Select the Default SATA Link Power Management (LPM) policy to use for mobile / laptop variants of chipsets / "South Bridges". - The value set has the following meanings: + Each policy combines power saving states and features: + - Partial: The Phy logic is powered but is in a reduced power + state. The exit latency from this state is no longer than + 10us). + - Slumber: The Phy logic is powered but is in an even lower power + state. The exit latency from this state is potentially + longer, but no longer than 10ms. + - DevSleep: The Phy logic may be powered down. The exit latency from + this state is no longer than 20 ms, unless otherwise + specified by DETO in the device Identify Device Data log. + - HIPM: Host Initiated Power Management (host automatically + transitions to partial and slumber). + - DIPM: Device Initiated Power Management (device automatically + transitions to partial and slumber). + + The possible values for the default SATA link power management + policies are: 0 => Keep firmware settings - 1 => Maximum performance - 2 => Medium power - 3 => Medium power with Device Initiated PM enabled - 4 => Minimum power - - Note "Minimum power" is known to cause issues, including disk - corruption, with some disks and should not be used. + 1 => No power savings (maximum performance) + 2 => HIPM (Partial) + 3 => HIPM (Partial) and DIPM (Partial and Slumber) + 4 => HIPM (Partial and DevSleep) and DIPM (Partial and Slumber) + 5 => HIPM (Slumber and DevSleep) and DIPM (Partial and Slumber) + + Excluding the value 0, higher values represent policies with higher + power savings. config SATA_AHCI_PLATFORM tristate "Platform AHCI SATA support" -- 2.50.1