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

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Message-ID: <430ed11c-0490-45be-897b-27cad9682371@quicinc.com>
Date: Tue, 25 Mar 2025 08:42:42 +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 3/24/2025 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);
  }

=================================================================================


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