linux-kernel - Re: [PATCH V6 1/2] ufs: core: Add CPU latency QoS support for ufs driver

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Message-ID: <90d13f1f-79aa-4067-b949-6f18cb1bb229@acm.org>
Date: Tue, 19 Dec 2023 09:00:31 -0800
From: Bart Van Assche <bvanassche@....org>
To: Maramaina Naresh <quic_mnaresh@...cinc.com>,
 "James E.J. Bottomley" <jejb@...ux.ibm.com>,
 "Martin K. Petersen" <martin.petersen@...cle.com>,
 Peter Wang <peter.wang@...iatek.com>,
 Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Alim Akhtar <alim.akhtar@...sung.com>, Avri Altman <avri.altman@....com>,
 Stanley Jhu <chu.stanley@...il.com>, linux-scsi@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, quic_cang@...cinc.com,
 quic_nguyenb@...cinc.com
Subject: Re: [PATCH V6 1/2] ufs: core: Add CPU latency QoS support for ufs
 driver

On 12/19/23 04:37, Maramaina Naresh wrote:
> Register ufs driver to CPU latency PM QoS framework to improve
> ufs device random io performance.
> 
> PM QoS initialization will insert new QoS request into the CPU
> latency QoS list with the maximum latency PM_QOS_DEFAULT_VALUE
> value.
> 
> UFS driver will vote for performance mode on scale up and power
> save mode for scale down.
> 
> If clock scaling feature is not enabled then voting will be based
> on clock on or off condition.

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