linux-kernel - Re: [PATCH 0/6] Add SMEM-based speedbin matching

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Message-ID: <wrvndv7ybn5dcnd6n7d62luwbogmjjsvqh6i3ow5exc3emqexk@n6b4bkydy5n7>
Date: Sat, 6 Apr 2024 06:28:15 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: Bjorn Andersson <andersson@...nel.org>, 
	Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
	Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org, 
	Neil Armstrong <neil.armstrong@...aro.org>
Subject: Re: [PATCH 0/6] Add SMEM-based speedbin matching

On Fri, Apr 05, 2024 at 10:41:28AM +0200, Konrad Dybcio wrote:
> Newer (SM8550+) SoCs don't seem to have a nice speedbin fuse anymore,
> but instead rely on a set of combinations of "feature code" (FC) and
> "product code" (PC) identifiers to match the bins. This series adds
> support for that.
> 
> I suppose a qcom/for-soc immutable branch would be in order if we want
> to land this in the upcoming cycle.
> 
> FWIW I preferred the fuses myself..
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
> Konrad Dybcio (5):
>       soc: qcom: Move some socinfo defines to the header, expand them
>       soc: qcom: smem: Add pcode/fcode getters
>       drm/msm/adreno: Implement SMEM-based speed bin
>       drm/msm/adreno: Add speedbin data for SM8550 / A740
>       arm64: dts: qcom: sm8550: Wire up GPU speed bin & more OPPs
> 
> Neil Armstrong (1):
>       drm/msm/adreno: Allow specifying default speedbin value

Generic comment: as you are reworking speed bins implementaiton, could
you please take a broader look. A5xx just reads nvmem manually. A6xx
uses adreno_read_speedbin(). And then we call adreno_read_speedbin
second time from from adreno_gpu_init(). Can we get to the point where
the function is called only once for all the platforms which implements
speed binning?

-- 
With best wishes
Dmitry