linux-kernel - Re: [PATCH v2 2/6] phy: qcom-qmp-ufs: Add PHY Configuration support for sm8750

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Message-ID: <7b08c860-e5f1-4665-8e5e-2a6a3e26a2fa@quicinc.com>
Date: Tue, 25 Mar 2025 13:07:32 +0530
From: Nitin Rawat <quic_nitirawa@...cinc.com>
To: <neil.armstrong@...aro.org>, Melody Olvera <quic_molvera@...cinc.com>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Manivannan Sadhasivam
	<manivannan.sadhasivam@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Bart Van Assche <bvanassche@....org>,
        Bjorn Andersson <andersson@...nel.org>, Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Satya Durga Srinivasu Prabhala
	<quic_satyap@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>
CC: <linux-arm-msm@...r.kernel.org>, <linux-phy@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-scsi@...r.kernel.org>, Manish Pandey <quic_mapa@...cinc.com>,
        "Linux
 regressions mailing list" <regressions@...ts.linux.dev>
Subject: Re: [PATCH v2 2/6] phy: qcom-qmp-ufs: Add PHY Configuration support
 for sm8750



On 3/25/2025 1:04 PM, neil.armstrong@...aro.org wrote:
> Hi,
> 
> On 25/03/2025 04:12, Nitin Rawat wrote:
>>
>>
>> On 3/24/2025 11:40 PM, Neil Armstrong wrote:
>>> Hi,
>>>
>>> On 10/03/2025 22:12, Melody Olvera wrote:
>>>> From: Nitin Rawat <quic_nitirawa@...cinc.com>
>>>>
>>>> Add SM8750 specific register layout and table configs. The serdes
>>>> TX RX register offset has changed for SM8750 and hence keep UFS
>>>> specific serdes offsets in a dedicated header file.
>>>>
>>>> Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
>>>> Co-developed-by: Manish Pandey <quic_mapa@...cinc.com>
>>>> Signed-off-by: Manish Pandey <quic_mapa@...cinc.com>
>>>> Signed-off-by: Nitin Rawat <quic_nitirawa@...cinc.com>
>>>> ---
>>>>   drivers/phy/qualcomm/phy-qcom-qmp-qserdes-com-v6.h |   7 +
>>>>   .../qualcomm/phy-qcom-qmp-qserdes-txrx-ufs-v7.h    |  67 ++++++++
>>>>   drivers/phy/qualcomm/phy-qcom-qmp-ufs.c            | 180 +++++++++ 
>>>> ++ +++++++++-
>>>>   3 files changed, 246 insertions(+), 8 deletions(-)
>>>>
>>>
>>> <snip>
>>>
>>> This change breaks UFS on the SM8550-HDK:
>>>
>>> [    7.418161] qcom-qmp-ufs-phy 1d80000.phy: phy initialization 
>>> timed-out
>>> [    7.427021] phy phy-1d80000.phy.0: phy poweron failed --> -110
>>> [    7.493514] ufshcd-qcom 1d84000.ufshc: Enabling the controller failed
>>> ...
>>
>> Hi Neil,
>>
>> Thanks for testing and reporting.
>> I did tested this patch on SM8750 MTP, SM8750 QRD, SM8650 MTP, SM8550 
>> MTP and SM8850 QRD all of these have rate B and hence no issue.
>>
>> Unfortunately only SM8550 HDK platform which UFS4.0 and RateA couldn't 
>> get tested. As we know SM8550 with gear 5 only support rate A.
>>
>> I was applying rate B setting without checking for mode type. Since
>> SM8550 is only platform which support only rate A with UFS4.0 . Hence
>> this could be the issue.
>>
>> Meanwhile can you help test at your end with below change and let me 
>> if it resolves for you. I will also try at my end to test as well.
>>
>> =============================================================================
>> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c b/drivers/phy/ 
>> qualcomm/phy-qcom-qmp-ufs.c
>> index 45b3b792696e..b33e2e2b5014 100644
>> --- a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
>> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
>> @@ -1754,7 +1754,8 @@ static void qmp_ufs_init_registers(struct 
>> qmp_ufs *qmp, const struct qmp_phy_cfg
>>                  qmp_ufs_init_all(qmp, &cfg->tbls_hs_overlay[i]);
>>          }
>>
>> -       qmp_ufs_init_all(qmp, &cfg->tbls_hs_b);
>> +       if (qmp->mode == PHY_MODE_UFS_HS_B)
>> +               qmp_ufs_init_all(qmp, &cfg->tbls_hs_b);
>>   }
>>
>> =================================================================================
> 
> With this change the UFS works again.

Thanks Neil for quick revert. I'll raise the official change.

Regards,
nitin

> 
> Thanks,
> Neil
> 
>>
>>
>> Thanks,
>> Nitin
>>
>>>
>>> GIT bisect points to:
>>> b02cc9a176793b207e959701af1ec26222093b05 is the first bad commit
>>> Author: Nitin Rawat <quic_nitirawa@...cinc.com>
>>> Date:   Mon Mar 10 14:12:30 2025 -0700
>>>
>>>      phy: qcom-qmp-ufs: Add PHY Configuration support for sm8750
>>>
>>> bisect log:
>>> git bisect start 'ff7f9b199e3f' 'v6.14-rc1'
>>> git bisect good 36c18c562846300d4e59f1a65008800b787f4fe4
>>> git bisect good 85cf0293c3a75726e7bc54d3efdc5dc783debc07
>>> git bisect good b2cd73e18cec75f917d14b9188f82a2fdef64ebe
>>> git bisect bad b247639d33ad16ea76797268fd0eef08d8027dfd
>>> git bisect good 9b3f2dfdad1cc0ab90a0fa371c8cbee08b2446e3
>>> git bisect bad 8dc30c3e4cf8c4e370cf08bd09eb87b0deccd3de
>>> git bisect bad 100aeb03a437f30300894091627e4406605ee3cb
>>> git bisect bad b2a1a2ae7818c9d8da12bf7b1983c8b9f5fb712b
>>> git bisect good 8f831f272b4c89aa13b45bd010c2c18ad97a3f1b
>>> git bisect good e45cc62c23428eefbae18a9b4d88d10749741bdd
>>> git bisect bad ebf198f17b5ac967db6256f4083bbcbdcc2a3100
>>> git bisect good 12185bc38f7667b1d895b2165a8a47335a4cf31b
>>> git bisect bad e46e59b77a9e6f322ef1ad08a8874211f389cf47
>>> git bisect bad b02cc9a176793b207e959701af1ec26222093b05
>>>
>>> CI run: https://git.codelinaro.org/linaro/qcomlt/ci/staging/cdba- 
>>> tester/-/jobs/229880#L1281
>>>
>>> #regzbot introduced: b02cc9a17679
>>>
>>> Neil
>>
>