linux-kernel - Re: [PATCH v2 1/1] drm/msm/adreno: Add support for SM7150 SoC machine

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Message-ID: <99ffd03f-b888-4222-939b-603c10f2307b@jiaxyga.com>
Date:   Thu, 23 Nov 2023 00:03:56 +0300
From:   Danila Tikhonov <danila@...xyga.com>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        robdclark@...il.com, quic_abhinavk@...cinc.com, sean@...rly.run,
        marijn.suijten@...ainline.org, airlied@...il.com, daniel@...ll.ch,
        johan+linaro@...nel.org, andersson@...nel.org,
        Akhil P Oommen <quic_akhilpo@...cinc.com>
Cc:     linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] drm/msm/adreno: Add support for SM7150 SoC machine

sc7180/sm7125 (atoll) expects speedbins from atoll.dtsi:
And has a parameter: /delete-property/ qcom,gpu-speed-bin;
107 for 504Mhz max freq, pwrlevel 4
130 for 610Mhz max freq, pwrlevel 3
159 for 750Mhz max freq, pwrlevel 5
169 for 800Mhz max freq, pwrlevel 2
174 for 825Mhz max freq, pwrlevel 1 (Downstream says 172, but thats 
probably typo)
For rest of the speed bins, speed-bin value is calulated as
FMAX/4.8MHz + 2 round up to zero decimal places.

sm7150 (sdmmagpie) expects speedbins from sdmmagpie-gpu.dtsi:
128 for 610Mhz max freq, pwrlevel 3
146 for 700Mhz max freq, pwrlevel 2
167 for 800Mhz max freq, pwrlevel 4
172 for 504Mhz max freq, pwrlevel 1
For rest of the speed bins, speed-bin value is calulated as
FMAX/4.8 MHz round up to zero decimal places.

Creating a new entry does not make much sense.
I can suggest expanding the standard entry:

.speedbins = ADRENO_SPEEDBINS(
     { 0, 0 },
     /* sc7180/sm7125 */
     { 107, 3 },
     { 130, 4 },
     { 159, 5 },
     { 168, 1 }, has already
     { 174, 2 }, has already
     /* sm7150 */
     { 128, 1 },
     { 146, 2 },
     { 167, 3 },
     { 172, 4 }, ),

All the best,
Danila

On 11/22/23 23:28, Konrad Dybcio wrote:
>
>
> On 10/16/23 16:32, Dmitry Baryshkov wrote:
>> On 26/09/2023 23:03, Konrad Dybcio wrote:
>>> On 26.09.2023 21:10, Danila Tikhonov wrote:
>>>>
>>>> I think you mean by name downstream dt - sdmmagpie-gpu.dtsi
>>>>
>>>> You can see the forked version of the mainline here:
>>>> https://github.com/sm7150-mainline/linux/blob/next/arch/arm64/boot/dts/qcom/sm7150.dtsi 
>>>>
>>>>
>>>> All fdt that we got here, if it is useful for you:
>>>> https://github.com/sm7150-mainline/downstream-fdt
>>>>
>>>> Best wishes, Danila
>>> Taking a look at downstream, atoll.dtsi (SC7180) includes
>>> sdmmagpie-gpu.dtsi.
>>>
>>> Bottom line is, they share the speed bins, so it should be
>>> fine to just extend the existing entry.
>>
>> But then atoll.dtsi rewrites speed bins and pwrlevel bins. So they 
>> are not shared.
> +Akhil
>
> could you please check internally?
>
> Konrad