linux-kernel - Re: [PATCH v2 6/7] phy: qualcomm: phy-qcom-qmp-ufs: Add High Speed Gear 5 support for SM8550

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Date:   Fri, 10 Nov 2023 17:32:11 +0800
From:   Can Guo <quic_cang@...cinc.com>
To:     <neil.armstrong@...aro.org>, Can Guo <cang@....qualcomm.com>,
        <bvanassche@....org>, <mani@...nel.org>,
        <stanley.chu@...iatek.com>, <adrian.hunter@...el.com>,
        <beanhuo@...ron.com>, <avri.altman@....com>,
        <junwoo80.lee@...sung.com>, <martin.petersen@...cle.com>
CC:     <linux-scsi@...r.kernel.org>, Andy Gross <agross@...nel.org>,
        "Bjorn Andersson" <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-arm-msm@...r.kernel.org>,
        "open list:GENERIC PHY FRAMEWORK" <linux-phy@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 6/7] phy: qualcomm: phy-qcom-qmp-ufs: Add High Speed
 Gear 5 support for SM8550

Hi Neil,

On 11/10/2023 5:17 PM, neil.armstrong@...aro.org wrote:
> Hi,
> 
> On 10/11/2023 10:03, Can Guo wrote:
>> Hi Neil,
>>
>> On 11/10/2023 4:47 PM, neil.armstrong@...aro.org wrote:
>>> Hi,
>>>
>>> On 07/11/2023 05:46, Can Guo wrote:
>>>> From: Can Guo <quic_cang@...cinc.com>
>>>>
>>>> On SM8550, two sets of UFS PHY settings are provided, one set is to 
>>>> support
>>>> HS-G5, another set is to support HS-G4 and lower gears. The two sets 
>>>> of PHY
>>>> settings are programming different values to different registers, 
>>>> mixing
>>>> the two sets and/or overwriting one set with another set is 
>>>> definitely not
>>>> blessed by UFS PHY designers. In order to add HS-G5 support for 
>>>> SM8550, we
>>>> need to split the two sets into their dedicated tables, and leave 
>>>> only the
>>>> common settings in the .tlbs. To have the PHY programmed with the 
>>>> correct
>>>> set of PHY settings, the submode passed to PHY driver must be either 
>>>> HS-G4
>>>> or HS-G5.
>>>
>>> I guess I'll need to rebase my SM8650 UFS PHY driver to support both 
>>> G4 and G5 modes
>>> at some point ?
>>
>>
>> Thank for reaching out. Yes, please.
>>
>> I can help review the PHY settings.
> 
> Ok I'll try rebasing on this serie and add G5 support.
> 
>>
>> BTW, are you enabling MCQ (by adding MCQ related DT) at the same time?
> 
> I tested MCQ but it triggers the same issues we have with suspend/resume 
> on SM8550 & SM8650,
> and the bindings are not present of the UFS qcom node.

Are you talking about suspend/resume fail with rpm/spm_lvl == 5? If yes, 
then Nitin and Naveen are working on fixing it.

If you have plan to enable UFS MCQ on SM8650 later, please let me know, 
I have some BUG fixes for it, we can co-work.

Thanks,
Can Guo

> 
> Neil
> 
>>
>> Thanks,
>> Can Guo.
>>
>>>
>>> Neil
>>>
>