linux-kernel - Re: [PATCH v3 5/6] arm64: dts: qcom: sm6150: Add gpu and rgmu nodes

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Message-ID: <6dc39f3e-0a2f-42ca-a088-4b62a8153001@oss.qualcomm.com>
Date: Fri, 5 Dec 2025 14:52:05 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Akhil P Oommen <akhilpo@....qualcomm.com>,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Rob Clark <robin.clark@....qualcomm.com>, Sean Paul <sean@...rly.run>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        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>,
        Jessica Zhang <jesszhan0024@...il.com>,
        Dan Carpenter <dan.carpenter@...aro.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Jie Zhang <quic_jiezh@...cinc.com>
Subject: Re: [PATCH v3 5/6] arm64: dts: qcom: sm6150: Add gpu and rgmu nodes

On 12/5/25 2:41 PM, Akhil P Oommen wrote:
> On 12/4/2025 7:01 PM, Konrad Dybcio wrote:
>> On 12/4/25 11:13 AM, Akhil P Oommen wrote:
>>> On 11/26/2025 6:12 AM, Dmitry Baryshkov wrote:
>>>> On Sat, Nov 22, 2025 at 03:03:10PM +0100, Konrad Dybcio wrote:
>>>>> On 11/21/25 10:52 PM, Akhil P Oommen wrote:
>>>>>> From: Jie Zhang <quic_jiezh@...cinc.com>
>>>>>>
>>>>>> Add gpu and rgmu nodes for qcs615 chipset.
>>>>>>
>>>>>> Signed-off-by: Jie Zhang <quic_jiezh@...cinc.com>
>>>>>> Signed-off-by: Akhil P Oommen <akhilpo@....qualcomm.com>
>>>>>> ---
>>>>>
>>>>> [...]
>>>>>
>>>>>> +			gpu_opp_table: opp-table {
>>>>>> +				compatible = "operating-points-v2";
>>>>>> +
>>>>>> +				opp-845000000 {
>>>>>> +					opp-hz = /bits/ 64 <845000000>;
>>>>>> +					required-opps = <&rpmhpd_opp_turbo>;
>>>>>> +					opp-peak-kBps = <7050000>;
>>>>>> +				};
>>>>>
>>>>> I see another speed of 895 @ turbo_l1, perhaps that's for speedbins
>>>>> or mobile parts specifically?
>>>>
>>>> msm-4.14 defines 7 speedbins for SM6150. Akhil, I don't see any of them
>>>> here.
>>>
>>> The IoT/Auto variants have a different frequency plan compared to the
>>> mobile variant. I reviewed the downstream code and this aligns with that
>>> except the 290Mhz corner. We can remove that one.
>>>
>>> Here we are describing the IoT variant of Talos. So we can ignore the
>>> speedbins from the mobile variant until that is supported.
>>
>> Writing this reply took probably only slightly less time than fixing
>> the issue.. I really see no point in kicking the can down the road
> 
> We don't know the speedbin fuse register and the values applicable for
> this IoT chipset. Currently, there is only a single variant and no SKUs
> for this chipset. We can add them when those decisions are taken by the
> relevant folks from Product team.

If there's only a single variant right now, could you simply read back
the value and report it where necessary to make sure the internal teams
are aware?

There's surely *some* value fused into the cell..

Konrad