linux-kernel - Re: [PATCH V5 0/3] Introduce the read-modify-write API to collect

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Message-ID: <cc1fec2c-1356-2716-86cf-5b76c18ec1dd@quicinc.com>
Date:   Mon, 24 Jul 2023 12:05:39 -0700
From:   Elliot Berman <quic_eberman@...cinc.com>
To:     Kathiravan T <quic_kathirav@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        "Mukesh Ojha" <quic_mojha@...cinc.com>,
        Kalle Valo <kvalo@...nel.org>,
        Loic Poulain <loic.poulain@...aro.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-gpio@...r.kernel.org>
CC:     <quic_srichara@...cinc.com>, <quic_sjaganat@...cinc.com>,
        <quic_anusha@...cinc.com>, <quic_saahtoma@...cinc.com>
Subject: Re: [PATCH V5 0/3] Introduce the read-modify-write API to collect



On 7/20/2023 12:04 AM, Kathiravan T wrote:
> On IPQ platforms, to collect the crashdump, we need to just modify the
> DLOAD bit in the TCSR register. Current infrastructure, overwrites the
> entire regiter value when enabling the crashdump feature, which leads to
> crashdump not gets collected. This series introduce the
> qcom_scm_io_update_field API to achieve the same.
> 

I don't think you describe patch 2 in the subject line or cover letter. 
As best I can tell, Patches 2 and 3 are independent. They're similar 
only in that they both depend on patch 1.

> Intially this approach is posted by Poovendhan[1], later Mukesh
> integrated this patch in his minidump support series[2]. Based on the
> current feedback on the minidump series, seems it will take sometime to
> get into a good shape, in the meantime these patches doesn't have any
> dependency with the minidump series. As discussed with the Mukesh[3],
> posting these 3 patches to enable the crashdump on IPQ chipsets.
> 
> Since the current version of minidump series is V4, I'm posting this as
> a V5. Please let me know if this should be V1.
> 
> [1]
> https://lore.kernel.org/linux-arm-msm/20230113160012.14893-4-quic_poovendh@quicinc.com/
> 
> [2]
> https://lore.kernel.org/linux-arm-msm/1676990381-18184-3-git-send-email-quic_mojha@quicinc.com/
> 
> [3]
> https://lore.kernel.org/linux-arm-msm/d77f5601-2b08-a7c7-1400-7ab68b8add3a@quicinc.com/
> 
> 
> Mukesh Ojha (3):
>    firmware: qcom_scm: provide a read-modify-write function
>    pinctrl: qcom: Use qcom_scm_io_update_field()
>    firmware: scm: Modify only the download bits in TCSR register
> 
>   drivers/firmware/qcom_scm.c            | 26 ++++++++++++++++++++++++--
>   drivers/pinctrl/qcom/pinctrl-msm.c     | 12 +++++-------
>   include/linux/firmware/qcom/qcom_scm.h |  2 ++
>   3 files changed, 31 insertions(+), 9 deletions(-)
>