linux-kernel - Re: [PATCH v3 2/3] arm64: dts: qcom: sc8280xp: Add GPU related nodes

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Message-ID: <ZHb3I6NUcjHZ64wD@hovoldconsulting.com>
Date:   Wed, 31 May 2023 09:28:35 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Bjorn Andersson <quic_bjorande@...cinc.com>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, mani@...nel.org,
        Steev Klimaszewski <steev@...i.org>
Subject: Re: [PATCH v3 2/3] arm64: dts: qcom: sc8280xp: Add GPU related nodes

On Tue, May 30, 2023 at 08:09:44PM -0700, Bjorn Andersson wrote:
> From: Bjorn Andersson <bjorn.andersson@...aro.org>
> 
> Add Adreno SMMU, GPU clock controller, GMU and GPU nodes for the
> SC8280XP.
> 
> Tested-by: Steev Klimaszewski <steev@...i.org>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> ---
> 
> Changes since v2:
> - Added missing opp level (both gpu and gmu)
> - Corrected opp-level for highest gpu opp
> - Added dma-coherent to gpu smmu
> 
> Note that in order for the GPU driver to probe, the last change
> requires:
> https://lore.kernel.org/linux-arm-msm/20230410185226.3240336-1-dmitry.baryshkov@linaro.org/

That's a pretty well-hidden notice about a critical dependency. I just
spent the morning debugging why this series broke the probe of the GPU
and only saw this when I was going to report my findings.

Please consider putting information like this in the cover letter in the
future.

> Changes since v1:
> - Dropped gmu_pdc_seq region from &gmu, as it shouldn't have been used.
> - Added missing compatible to &adreno_smmu.
> - Dropped aoss_qmp clock in &gmu and &adreno_smmu.

Changelogs are also preferably placed in the cover letter so that you
don't have to read through N patches to determine what changed from one
revision of a series to the next.

Johan