linux-kernel - Re: [PATCH v3 08/11] drm/panfrost: Add the MT8192 GPU ID

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Message-ID: <61ebdd1a-2737-0516-08fd-3b9aa0ddd4fe@collabora.com>
Date:   Fri, 24 Feb 2023 14:08:27 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Chen-Yu Tsai <wenst@...omium.org>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        Steven Price <steven.price@....com>
Cc:     airlied@...il.com, daniel@...ll.ch, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, matthias.bgg@...il.com,
        robh@...nel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v3 08/11] drm/panfrost: Add the MT8192 GPU ID

Il 24/02/23 11:06, Chen-Yu Tsai ha scritto:
> On Thu, Feb 23, 2023 at 9:35 PM AngeloGioacchino Del Regno
> <angelogioacchino.delregno@...labora.com> wrote:
>>
>> From: Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>
>>
>> MediaTek MT8192 has a Mali-G57 with a special GPU ID. Add its GPU ID,
>> but treat it as otherwise identical to a standard Mali-G57.
>>
>> We do _not_ fix up the GPU ID here -- userspace needs to be aware of the
>> special GPU ID, in case we find functional differences between
>> MediaTek's implementation and the standard Mali-G57 down the line.
>>
>> Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>
>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>> Reviewed-by: Steven Price <steven.price@....com>
> 
> Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>
> 
> As previously mentioned, MT8195 Mali G57 has minor revision number 1.
> Do we need to handle that?
> 

Maybe something went wrong while sending the reply to the same question on v2?

Anyway, from what I can see on my MT8195 machine, it works fine without adding
any particular handling...

Alyssa, Steven,
are you aware of anything that we should consider?

Regards,
Angelo

>> ---
>>   drivers/gpu/drm/panfrost/panfrost_gpu.c | 8 ++++++++
>>   1 file changed, 8 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c
>> index 6452e4e900dd..d28b99732dde 100644
>> --- a/drivers/gpu/drm/panfrost/panfrost_gpu.c
>> +++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c
>> @@ -204,6 +204,14 @@ static const struct panfrost_model gpu_models[] = {
>>
>>          GPU_MODEL(g57, 0x9001,
>>                  GPU_REV(g57, 0, 0)),
>> +
>> +       /* MediaTek MT8192 has a Mali-G57 with a different GPU ID from the
>> +        * standard. Arm's driver does not appear to handle this model.
>> +        * ChromeOS has a hack downstream for it. Treat it as equivalent to
>> +        * standard Mali-G57 for now.
>> +        */
>> +       GPU_MODEL(g57, 0x9003,
>> +               GPU_REV(g57, 0, 0)),
>>   };
>>
>>   static void panfrost_gpu_init_features(struct panfrost_device *pfdev)
>> --
>> 2.39.2
>>