linux-kernel - Re: [PATCH 0/8] Support Multi-frequency scale for UFS

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Message-ID: <92b2f271-34dc-4560-a96c-bdd372d5e3d6@linaro.org>
Date: Thu, 16 Jan 2025 10:28:55 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
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-scsi@...r.kernel.org, Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 "open list:ARM/Mediatek SoC support:Keyword:mediatek"
 <linux-kernel@...r.kernel.org>,
 "moderated list:ARM/Mediatek SoC support:Keyword:mediatek"
 <linux-arm-kernel@...ts.infradead.org>,
 "moderated list:ARM/Mediatek SoC support:Keyword:mediatek"
 <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH 0/8] Support Multi-frequency scale for UFS

Hi,

[+linux-arm-msm@...r.kernel.org]

On 16/01/2025 10:11, Ziqi Chen wrote:
> With OPP V2 enabled, devfreq can scale clocks amongst multiple frequency
> plans. However, the gear speed is only toggled between min and max during
> clock scaling. Enable multi-level gear scaling by mapping clock frequencies
> to gear speeds, so that when devfreq scales clock frequencies we can put
> the UFS link at the appropraite gear speeds accordingly.
> 
> This series has been tested on below platforms -
> SM8650 + UFS3.1

Which board did you use ? the MTP ?

> SM8750 + UFS4.0

Did you alse test it on SM8550 ? this platform is also concerned.
And perhaps SM8450 should be also converted to the OPP table & tested.

Please Cc linux-arm-msm on all patches since we're directly concerned by
the whole changeset.

Thanks,
Neil

> 
> 
> Can Guo (6):
>    scsi: ufs: core: Pass target_freq to clk_scale_notify() vops
>    scsi: ufs: qcom: Pass target_freq to clk scale pre and post change
>    scsi: ufs: core: Add a vops to map clock frequency to gear speed
>    scsi: ufs: qcom: Implement the freq_to_gear_speed() vops
>    scsi: ufs: core: Enable multi-level gear scaling
>    scsi: ufs: core: Toggle Write Booster during clock scaling base on
>      gear speed
> 
> Ziqi Chen (2):
>    scsi: ufs: core: Check if scaling up is required when disable clkscale
>    ARM: dts: msm: Use Operation Points V2 for UFS on SM8650
> 
>   arch/arm64/boot/dts/qcom/sm8650.dtsi | 51 ++++++++++++++++----
>   drivers/ufs/core/ufshcd-priv.h       | 17 +++++--
>   drivers/ufs/core/ufshcd.c            | 71 +++++++++++++++++++++-------
>   drivers/ufs/host/ufs-mediatek.c      |  1 +
>   drivers/ufs/host/ufs-qcom.c          | 60 ++++++++++++++++++-----
>   include/ufs/ufshcd.h                 |  8 +++-
>   6 files changed, 166 insertions(+), 42 deletions(-)
>