linux-kernel - Re: [PATCH v2 3/3] coresight-tpda: Optimize the function of reading element size

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Message-ID: <b32ffd89-fbb1-4796-9780-d3c334d69485@quicinc.com>
Date: Thu, 18 Jul 2024 10:24:09 +0800
From: Tao Zhang <quic_taozha@...cinc.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach
	<mike.leach@...aro.org>, James Clark <james.clark@....com>,
        Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan
	<leo.yan@...ux.dev>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
CC: <coresight@...ts.linaro.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] coresight-tpda: Optimize the function of reading
 element size


On 7/11/2024 9:25 PM, Suzuki K Poulose wrote:
> On 11/07/2024 09:17, Tao Zhang wrote:
>> Since the new funnel device supports multi-port output scenarios,
>> there may be more than one TPDM connected to one TPDA. In this
>> way, when reading the element size of the TPDM, TPDA driver needs
>> to find the expected TPDM corresponding to the filter source.
>> When TPDA finds a TPDM or a filter source from a input connection,
>> it will read the Devicetree to get the expected TPDM's element
>> size.
>>
>> Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-tpda.c | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c 
>> b/drivers/hwtracing/coresight/coresight-tpda.c
>> index bfca103f9f84..4936ba4a7625 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpda.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
>> @@ -110,6 +110,8 @@ static int tpda_get_element_size(struct 
>> tpda_drvdata *drvdata,
>>               csdev->pdata->in_conns[i]->dest_port != inport)
>>               continue;
>>   +        if (csdev->pdata->in_conns[i]->filter_src_dev)
>> +            in = csdev->pdata->in_conns[i]->filter_src_dev;
>
> Actually, this may not be complete, if the device was removed. Also add
> a comment here.
>
>         /*
>          * If this port has a hardcoded filter, use the source
>          * device directly.
>          */
>         if (csdev->pdata->in_conns[i]->filter_src_fwnode) {
>             in = csdev->pdata->in_conns[i]->filter_src_dev;
>             if (!in)
>                 continue;
>         }

I will update to the next version.


Best,

Tao

>
>
> Suzuki
>
>>           if (coresight_device_is_tpdm(in)) {
>>               if (drvdata->dsb_esize || drvdata->cmb_esize)
>>                   return -EEXIST;
>> @@ -124,7 +126,6 @@ static int tpda_get_element_size(struct 
>> tpda_drvdata *drvdata,
>>           }
>>       }
>>   -
>
>>       return rc;
>>   }
>