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

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Message-ID: <ecb6fd1d-da28-498e-96ec-6c909f27f7dc@quicinc.com>
Date: Mon, 20 Jan 2025 19:56:18 +0800
From: Ziqi Chen <quic_ziqichen@...cinc.com>
To: <neil.armstrong@...aro.org>, <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 Neil,

Thanks for your comment.

On 1/16/2025 5:28 PM, Neil Armstrong wrote:
> 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 ? >

We tested on 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.
>
We didn't test in on SM8550 before, but now we already tested it on 
SM8550 once see you this comment. It works fine on SM8550 as well.
I will update this information in next version.

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

Sure , Thank you for reminder, I will CC this group from next version.

> 
> Thanks,
> Neil
>

-Ziqi

>>
>>
>> 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(-)
>>
>