linux-kernel - Re: [PATCH] coresight: dynamic-replicator: Fix handling of multiple connections

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Message-ID: <4bd741e342f8e2743197ed6105dacffa@codeaurora.org>
Date:   Sat, 16 May 2020 15:34:48 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Mike Leach <mike.leach@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Stephen Boyd <swboyd@...omium.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH] coresight: dynamic-replicator: Fix handling of multiple
 connections

Hi Mike, Suzuki

[...]

>> 
>> Please look at the CoreSight components specification 3.0 (ARM IHI
>> 0029E) Section B2.1.2 which describes the Unique Component Identifier
>> (UCI).
>> As mentioned above this consists of a combination of bits from
>> multiple registers, including PIDR4.
>> 
> 
> Ok got it now, thanks for clearing the doubt. I will go ahead with
> this method to identify QCOM impl and post a patch.
> 

Looking some more into this, since we have this limitation only on
specific replicator on very few QCOM SoCs, rather than having a blanket
workaround for all QCOM, we were thinking it would be better to have
this workaround based on a firmware property something like
"qcom,replicator-loses-context" for those replicators with this
limitation and then set the drvdata->check_idfilter_val based on
this property.

Thanks,
Sai

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