linux-kernel - Re: [PATCH v5 3/8] scsi: ufs: core: Add a vop to map clock frequency to gear speed

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Message-ID: <1b95749e23fd66cfba6d9bba1f822a727ecf7ba8.camel@mediatek.com>
Date: Fri, 14 Feb 2025 05:54:06 +0000
From: Peter Wang (王信友) <peter.wang@...iatek.com>
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Subject: Re: [PATCH v5 3/8] scsi: ufs: core: Add a vop to map clock frequency
 to gear speed

On Thu, 2025-02-13 at 16:00 +0800, Ziqi Chen wrote:
> 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> From: Can Guo <quic_cang@...cinc.com>
> 
> Add a vop to map UFS host controller clock frequencies to the
> corresponding
> maximum supported UFS high speed gear speeds. During clock scaling,
> we can
> map the target 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>
> Reviewed-by: Bean Huo <beanhuo@...ron.com>
> Reviewed-by: Bart Van Assche <bvanassche@....org>
> Tested-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
> v2 -> v3:
> 1. Remove the parameter 'gear' and use it as function return result.
> 2. Change "vops" into "vop" in commit message.
> 
> v4 -> v5:
> 1. keep the indentation consistent for vop freq_to_gear_speed.
> 2. Change the return value type of vop freq_to_gear_speed from 'int'
> to 'u32'.
> ---
> 

Reviewed-by: Peter Wang <peter.wang@...iatek.com>