linux-kernel - Re: [PATCH v9 00/13] Add support to configure TPDM DSB subunit

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Date:   Wed, 27 Sep 2023 09:58:11 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Tao Zhang <quic_taozha@...cinc.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Konrad Dybcio <konradybcio@...il.com>,
        Mike Leach <mike.leach@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Jinlong Mao <quic_jinlmao@...cinc.com>,
        Leo Yan <leo.yan@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Tingwei Zhang <quic_tingweiz@...cinc.com>,
        Yuanfang Zhang <quic_yuanfang@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Hao Zhang <quic_hazha@...cinc.com>,
        linux-arm-msm@...r.kernel.org, andersson@...nel.org
Subject: Re: [PATCH v9 00/13] Add support to configure TPDM DSB subunit

On 27/09/2023 07:37, Tao Zhang wrote:
> 
> On 9/26/2023 9:12 PM, Suzuki K Poulose wrote:
>> On 14/09/2023 06:43, Tao Zhang wrote:
>>> Introduction of TPDM DSB subunit
>>> DSB subunit is responsible for creating a dataset element, and is also
>>> optionally responsible for packing it to fit multiple elements on a
>>> single ATB transfer if possible in the configuration. The TPDM Core
>>> Datapath requests timestamps be stored by the TPDA and then delivering
>>> ATB sized data (depending on ATB width and element size, this could
>>> be smaller or larger than a dataset element) to the ATB Mast FSM.
>>>
>>> The DSB subunit must be configured prior to enablement. This series
>>> adds support for TPDM to configure the configure DSB subunit.
>>>
>>> Once this series patches are applied properly, the new tpdm nodes for
>>> should be observed at the tpdm path /sys/bus/coresight/devices/tpdm*
>>> which supports DSB subunit.
>>> e.g.
>>> root@...uarm64:/sys/devices/platform/soc@...c08000.tpdm/tpdm1# ls -l
>>> drwxr-xr-x    2 root     root             0 Jan  1 00:00 connections
>>> drwxr-xr-x    2 root     root             0 Jan  1 00:00 dsb_edge
>>> -rw-r--r--    1 root     root          4096 Jan  1 00:00 dsb_mode
>>> drwxr-xr-x    2 root     root             0 Jan  1 00:00 dsb_msr
>>> drwxr-xr-x    2 root     root             0 Jan  1 00:00 dsb_patt
>>> -rw-r--r--    1 root     root          4096 Jan  1 00:00 dsb_patt_ts
>>> -rw-r--r--    1 root     root          4096 Jan  1 00:00 dsb_patt_type
>>> drwxr-xr-x    2 root     root             0 Jan  1 00:00 dsb_trig_patt
>>> -rw-r--r--    1 root     root          4096 Jan  1 00:00 dsb_trig_ts
>>> -rw-r--r--    1 root     root          4096 Jan  1 00:00 dsb_trig_type
>>> -rw-r--r--    1 root     root          4096 Jan  1 00:02 enable_source
>>> --w-------    1 root     root          4096 Jan  1 00:00 
>>> integration_test
>>> drwxr-xr-x    2 root     root             0 Jan  1 00:00 power
>>> --w-------    1 root     root          4096 Jan  1 00:02 reset_dataset
>>> lrwxrwxrwx    1 root     root             0 Apr  5  2021 subsystem -> 
>>> ../../../../../bus/coresight
>>> -rw-r--r--    1 root     root          4096 Apr  5  2021 uevent
>>> -r--r--r--    1 root     root          4096 Jan  1 00:00 
>>> waiting_for_supplier
>>>
>>> We can use the commands are similar to the below to configure the
>>> TPDMs which support DSB subunit. Enable coresight sink first.
>>> echo 1 > /sys/bus/coresight/devices/tmc_etf0/enable_sink
>>> echo 1 > /sys/bus/coresight/devices/tpdm1/reset_dataset
>>> echo 0x3 > /sys/bus/coresight/devices/tpdm1/dsb_edge/ctrl_idx
>>> echo 0x1 > /sys/bus/coresight/devices/tpdm1/dsb_edge/ctrl_mask
>>> echo 0x0 > /sys/bus/coresight/devices/tpdm1/dsb_edge/ctrl_val
>>> echo 1 > /sys/bus/coresight/devices/tpdm1/dsb_patt/enable_ts
>>> echo 1 > /sys/bus/coresight/devices/tpdm1/dsb_patt/set_type
>>> echo 0 > /sys/bus/coresight/devices/tpdm1/dsb_trig_ts
>>> echo 0xFFFFFFFF > /sys/bus/coresight/devices/tpdm1/dsb_patt/tpmr5
>>> echo 0xFFFFFFFF > /sys/bus/coresight/devices/tpdm1/dsb_trig_patt/xpr2
>>> echo 1 > /sys/bus/coresight/devices/tpdm1/enable_source
>>>
>>
>> I have reviewed this set, except for the last patch, rest looks fine.
>> If you could resend the series with the comments addressed, we could
>> queue this.
> 
> That's great. Thanks for your review.
> 
> I also want to make a minor change.
> 
> Can I rename "tpdm_dsb_attrs_grp" to "tpdm_dsb_attr_grp" in the next 

Sure, that is fine. The proposed changes to the other patch look good
too.

Suzuki