linux-kernel - Re: [PATCH 03/12] coresight: Extend the PIDR mask to cover relevant bits in PIDR2

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Date:   Tue, 13 Jun 2017 13:06:05 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Suzuki K Poulose <Suzuki.Poulose@....com>
Cc:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH 03/12] coresight: Extend the PIDR mask to cover relevant
 bits in PIDR2

On 13 June 2017 at 11:55, Suzuki K Poulose <Suzuki.Poulose@....com> wrote:
> On 13/06/17 18:53, Mathieu Poirier wrote:
>>
>> On Mon, Jun 12, 2017 at 03:36:42PM +0100, Suzuki K Poulose wrote:
>>>
>>> As per coresight standards, PIDR2 register has the following format :
>>>
>>>  [2-0]  - JEP106_bits6to4
>>>  [3]    - JEDEC, designer ID is specified by JEDEC.
>>>
>>> However some of the drivers only use mask of 0x3 for the PIDR2 leaving
>>> bits [3-2] unchecked, which could potentially match the component for
>>> a different device altogether. This patch fixes the mask and the
>>> corresponding id bits for the existing devices.
>>>
>>> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
>>> Cc: Linus Walleij <linus.walleij@...aro.org>
>>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
>>> ---
>>> I have not touched the TPIU ids for Ux500 (see commit: 4339b699),
>>> as I don't have a platform to fix/correct the ids.
>>> ---
>>>  drivers/hwtracing/coresight/coresight-funnel.c          | 4 ++--
>>>  drivers/hwtracing/coresight/coresight-replicator-qcom.c | 4 ++--
>>>  drivers/hwtracing/coresight/coresight-stm.c             | 8 ++++----
>>>  drivers/hwtracing/coresight/coresight-tmc.c             | 4 ++--
>>>  drivers/hwtracing/coresight/coresight-tpiu.c            | 4 ++--
>>
>>
>> Any reason for not adding ETMv3 to the list?  From what I see in the
>> documentation bit [2-0] need to 0b011 and the JEDEC bit is always 1.
>
>
> I don't have a platform to test it easily. Hence the exclusion. Same for
> etbv10.

I have a TC2 - add them in and I'll test it.

>
>
> Suzuki
>