linux-kernel - Re: [PATCH v8 18/18] drm/msm/a6xx: Add A610 speedbin support

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Message-ID: <f0261f2a-76d9-fcbf-2a3e-edae14f77604@linaro.org>
Date:   Thu, 15 Jun 2023 12:04:53 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Akhil P Oommen <quic_akhilpo@...cinc.com>
Cc:     Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Rob Clark <robdclark@...omium.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>
Subject: Re: [PATCH v8 18/18] drm/msm/a6xx: Add A610 speedbin support

On 14.06.2023 22:18, Akhil P Oommen wrote:
> On Mon, May 29, 2023 at 03:52:37PM +0200, Konrad Dybcio wrote:
>>
>> A610 is implemented on at least three SoCs: SM6115 (bengal), SM6125
>> (trinket) and SM6225 (khaje). Trinket does not support speed binning
>> (only a single SKU exists) and we don't yet support khaje upstream.
>> Hence, add a fuse mapping table for bengal to allow for per-chip
>> frequency limiting.
>>
>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
>>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 27 +++++++++++++++++++++++++++
>>  1 file changed, 27 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
>> index d046af5f6de2..c304fa118cff 100644
>> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
>> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
>> @@ -2098,6 +2098,30 @@ static bool a6xx_progress(struct msm_gpu *gpu, struct msm_ringbuffer *ring)
>>  	return progress;
>>  }
>>  
>> +static u32 a610_get_speed_bin(u32 fuse)
>> +{
>> +	/*
>> +	 * There are (at least) three SoCs implementing A610: SM6125 (trinket),
>> +	 * SM6115 (bengal) and SM6225 (khaje). Trinket does not have speedbinning,
>> +	 * as only a single SKU exists and we don't support khaje upstream yet.
>> +	 * Hence, this matching table is only valid for bengal and can be easily
>> +	 * expanded if need be.
>> +	 */
>> +
>> +	if (fuse == 0)
>> +		return 0;
>> +	else if (fuse == 206)
>> +		return 1;
>> +	else if (fuse == 200)
>> +		return 2;
>> +	else if (fuse == 157)
>> +		return 3;
>> +	else if (fuse == 127)
>> +		return 4;
>> +
>> +	return UINT_MAX;
>> +}
>> +
>>  static u32 a618_get_speed_bin(u32 fuse)
>>  {
>>  	if (fuse == 0)
>> @@ -2195,6 +2219,9 @@ static u32 fuse_to_supp_hw(struct device *dev, struct adreno_gpu *adreno_gpu, u3
>>  {
>>  	u32 val = UINT_MAX;
>>  
>> +	if (adreno_is_a610(adreno_gpu))
>> +		val = a610_get_speed_bin(fuse);
>> +
> 
> Didn't you update here to convert to 'else if' in one of the earlier
> patches??
Right, missed this one!

Konrad
> 
> Reviewed-by: Akhil P Oommen <quic_akhilpo@...cinc.com>
> 
> -Akhil.
>>  	if (adreno_is_a618(adreno_gpu))
>>  		val = a618_get_speed_bin(fuse);
>>  
>>
>> -- 
>> 2.40.1
>>