linux-kernel - Re: [PATCH v3] drm/msm/a6xx: Add support for Adreno 612

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Message-ID: <7f5144e2-1c28-4e12-a9eb-1e8c8220bbcf@quicinc.com>
Date: Tue, 24 Dec 2024 02:52:39 +0530
From: Akhil P Oommen <quic_akhilpo@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Konrad Dybcio
	<konrad.dybcio@....qualcomm.com>
CC: Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        "Konrad
 Dybcio" <konradybcio@...nel.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie
	<airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        Jie Zhang
	<quic_jiezh@...cinc.com>
Subject: Re: [PATCH v3] drm/msm/a6xx: Add support for Adreno 612

On 12/21/2024 2:28 AM, Dmitry Baryshkov wrote:
> On Fri, Dec 20, 2024 at 08:56:31PM +0100, Konrad Dybcio wrote:
>> On 13.12.2024 12:46 PM, Akhil P Oommen wrote:
>>> From: Jie Zhang <quic_jiezh@...cinc.com>
>>>
>>> Add support for Adreno 612 GPU found in SM6150/QCS615 chipsets.
>>> A612 falls under ADRENO_6XX_GEN1 family and is a cut down version
>>> of A615 GPU.
>>>
>>> A612 has a new IP called Reduced Graphics Management Unit or RGMU
>>> which is a small state machine which helps to toggle GX GDSC
>>> (connected to CX rail) to implement IFPC feature. It doesn't support
>>> any other features of a full fledged GMU like clock control, resource
>>> voting to rpmh etc. So we need linux clock driver support like other
>>> gmu-wrapper implementations to control gpu core clock and gpu GX gdsc.
>>> Since there is no benefit with enabling RGMU at the moment, RGMU is
>>> entirely skipped in this patch.
>>>
>>> Signed-off-by: Jie Zhang <quic_jiezh@...cinc.com>
>>> Signed-off-by: Akhil P Oommen <quic_akhilpo@...cinc.com>
>>> Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
>>> ---
>>
>> So we talked offline a bit, and the RGMU requires a piece of firmware.
>>
>> We concluded it's best to describe that from the get-go, so that the
>> user doesn't get surprised when a new kernel update brings new firmware
>> requirements for previously-working hardware.
> 
> I'd say, please make sure that the RGMU firmware is also a part of the
> linux-firmware from the beginning.

Yes, I am working on that part. I will send another revision of this patch.

-Akhil

> 
>>
>> Please wait for the new revision.
>>
>> Konrad
>