linux-kernel - Re: [PATCH V5 3/4] scsi: ufs: core Enforce minimum pm level for sysfs configuration

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Message-ID: <b815dd96-5518-4667-9fde-d23391102717@acm.org>
Date: Tue, 20 Jan 2026 09:44:37 -0800
From: Bart Van Assche <bvanassche@....org>
To: Ram Kumar Dwivedi <ram.dwivedi@....qualcomm.com>, mani@...nel.org,
 alim.akhtar@...sung.com, avri.altman@....com, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org,
 James.Bottomley@...senPartnership.com, martin.petersen@...cle.com
Cc: linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5 3/4] scsi: ufs: core Enforce minimum pm level for sysfs
 configuration

On 1/13/26 12:00 AM, Ram Kumar Dwivedi wrote:
> Some UFS platforms only support a limited subset of power levels.
> Currently, the sysfs interface allows users to set any pm level
> without validating the minimum supported value. If an unsupported
> level is selected, suspend may fail.
> 
> Introduce an pm_lvl_min field in the ufs_hba structure and use it
> to clamp the pm level requested via sysfs so that only supported
> levels are accepted. Platforms that require a minimum pm level
> can set this field during probe.

Reviewed-by: Bart Van Assche <bvanassche@....org>