linux-kernel - Re: [PATCH v4 3/6] arm64: dts: qcom: sa8775p: Add gpu and gmu nodes

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Message-ID: <5bbe77f0-185f-4905-8097-8769f0d5f518@oss.qualcomm.com>
Date: Mon, 8 Sep 2025 17:39:04 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: rob.clark@....qualcomm.com, Akhil P Oommen <akhilpo@....qualcomm.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.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>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Connor Abbott <cwabbott0@...il.com>,
        Srinivas Kandagatla <srini@...nel.org>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Gaurav Kohli <quic_gkohli@...cinc.com>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Puranam V G Tejaswi <quic_pvgtejas@...cinc.com>
Subject: Re: [PATCH v4 3/6] arm64: dts: qcom: sa8775p: Add gpu and gmu nodes

On 9/7/25 1:02 AM, Rob Clark wrote:
> On Sat, Sep 6, 2025 at 1:56 PM Akhil P Oommen <akhilpo@....qualcomm.com> wrote:
>>
>> On 9/3/2025 8:44 PM, Konrad Dybcio wrote:
>>> On 9/3/25 4:00 PM, Dmitry Baryshkov wrote:
>>>> On Wed, Sep 03, 2025 at 03:36:34PM +0200, Konrad Dybcio wrote:
>>>>> On 9/3/25 2:39 PM, Dmitry Baryshkov wrote:
>>>>>> On Wed, Sep 03, 2025 at 02:26:30PM +0200, Konrad Dybcio wrote:
>>>>>>> On 8/21/25 8:55 PM, Akhil P Oommen wrote:
>>>>>>>> From: Puranam V G Tejaswi <quic_pvgtejas@...cinc.com>
>>>>>>>>
>>>>>>>> Add gpu and gmu nodes for sa8775p chipset. As of now all
>>>>>>>> SKUs have the same GPU fmax, so there is no requirement of
>>>>>>>> speed bin support.
>>>>>>>>
>>>>>>>> Signed-off-by: Puranam V G Tejaswi <quic_pvgtejas@...cinc.com>
>>>>>>>> Signed-off-by: Akhil P Oommen <akhilpo@....qualcomm.com>
>>>>>>>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>>>>>>>> ---
>>>>>>>>  arch/arm64/boot/dts/qcom/lemans.dtsi | 116 +++++++++++++++++++++++++++++++++++
>>>>>>>>  1 file changed, 116 insertions(+)
>>>>>>>>
>>>>>>>> diff --git a/arch/arm64/boot/dts/qcom/lemans.dtsi b/arch/arm64/boot/dts/qcom/lemans.dtsi
>>>>>>>> index 8ceb59742a9fc6562b2c38731ddabe3a549f7f35..8eac8d4719db9230105ad93ac22287850b6b007c 100644
>>>>>>>> --- a/arch/arm64/boot/dts/qcom/lemans.dtsi
>>>>>>>> +++ b/arch/arm64/boot/dts/qcom/lemans.dtsi
>>>>>>>> @@ -1097,6 +1097,18 @@ ipcc: mailbox@...000 {
>>>>>>>>                          #mbox-cells = <2>;
>>>>>>>>                  };
>>>>>>>>
>>>>>>>> +                qfprom: efuse@...000 {
>>>>>>>> +                        compatible = "qcom,sa8775p-qfprom", "qcom,qfprom";
>>>>>>>> +                        reg = <0x0 0x00784000 0x0 0x2410>;
>>>>>>>
>>>>>>> len = 0x3000
>>>>>>>
>>>>>>> [...]
>>>>>>>
>>>>>>>> +                gmu: gmu@...a000 {
>>>>>>>> +                        compatible = "qcom,adreno-gmu-663.0", "qcom,adreno-gmu";
>>>>>>>> +                        reg = <0x0 0x03d6a000 0x0 0x34000>,
>>>>>>>
>>>>>>> This bleeds into GPU_CC, len should be 0x26000
>>>>>>
>>>>>> gpucc is in the middle of GMU, see other platforms.
>>>>>
>>>>> This is not the case here
>>>>
>>>> Why? I think GPU CC is a part of the GMU by design: GMU accesses GPU CC
>>>> registers directly from the firmware.
>>>
>>> Correct, however this is only a similarly sounding argument - the DT
>>> describes the hardware from the main Arm cluster POV. The GMU Cortex-M
>>> core has its own address map etc.
> 
> but the firmware is part of how the hardware appears to the main arm cluster
> 
>> We have been keeping GPUCC region in the GMU's reg range in all chipsets
>> for the purpose of coredump.
>>
>> Can we leave this as is until we have a mechanism to dump these into gpu
>> coredump (via gpucc driver??)? I recall you proposed something similar
>> sometime back.
> 
> IMO we should keep this in the GMU range.. if in the future we have
> some other mechanism to dump gpucc state, then for future platforms we
> can start using that (ie. new dt but old kernel should be a thing we
> at least pretend to try to keep working), but for current/past
> platforms we should stick with keeping this in the GMU's range

Eh, right, sorry, we discussed this with I think x1e, let's keep it
as-is until more infra is in place

Konrad