linux-kernel - Re: [PATCH v3 3/8] scsi: ufs: core: Add a vop to map clock frequency to gear speed

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Message-ID: <21d0a62a4f7f17304d81449e75c345f1e47948ae.camel@gmail.com>
Date: Mon, 03 Feb 2025 13:55:38 +0100
From: Bean Huo <huobean@...il.com>
To: Ziqi Chen <quic_ziqichen@...cinc.com>, quic_cang@...cinc.com, 
 bvanassche@....org, mani@...nel.org, beanhuo@...ron.com,
 avri.altman@....com,  junwoo80.lee@...sung.com, martin.petersen@...cle.com,
 quic_nguyenb@...cinc.com,  quic_nitirawa@...cinc.com,
 quic_rampraka@...cinc.com
Cc: linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org, Alim Akhtar
 <alim.akhtar@...sung.com>, "James E.J. Bottomley"
 <James.Bottomley@...senPartnership.com>, Peter Wang
 <peter.wang@...iatek.com>,  Manivannan Sadhasivam
 <manivannan.sadhasivam@...aro.org>, Eric Biggers <ebiggers@...gle.com>,
 Minwoo Im <minwoo.im@...sung.com>,  open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/8] scsi: ufs: core: Add a vop to map clock
 frequency to gear speed

On Mon, 2025-02-03 at 16:11 +0800, Ziqi Chen wrote:
> From: Can Guo <quic_cang@...cinc.com>
> 
> Add a vop to map UFS host controller clock frequencies to the maximum
> supported UFS high speed gear speeds. 

>From the code, seems it is not "maximum" gear, it is corresponding UFS
Gear.

> During clock scaling, we canmap thetarget clock frequency, demanded
> by devfreq, to the maximum supported gear
> speed, so that devfreq can scale the gear to the highest gear speed
> supported at the target clock frequency, instead of just scaling
> up/down
> the gear between the min and max gear speeds.
> 
> Co-developed-by: Ziqi Chen <quic_ziqichen@...cinc.com>
> Signed-off-by: Ziqi Chen <quic_ziqichen@...cinc.com>
> Signed-off-by: Can Guo <quic_cang@...cinc.com>

Reveiwed-by: Bean Huo <beanhuo@...ron.com>