linux-kernel - Re: [PATCH v5 0/6] Add support for GPU DDR BW scaling

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Date:   Wed, 15 Jul 2020 08:36:43 -0700
From:   Rob Clark <robdclark@...il.com>
To:     Akhil P Oommen <akhilpo@...eaurora.org>
Cc:     freedreno <freedreno@...ts.freedesktop.org>,
        dri-devel@...edesktop.org,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Sharat Masetty <smasetty@...eaurora.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Matthias Kaehlcke <mka@...omium.org>,
        saravanak@...gle.com, Sibi Sankar <sibis@...eaurora.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Jonathan <jonathan@...ek.ca>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH v5 0/6] Add support for GPU DDR BW scaling

On Mon, Jul 13, 2020 at 5:41 AM Akhil P Oommen <akhilpo@...eaurora.org> wrote:
>
> This series adds support for GPU DDR bandwidth scaling and is based on the
> bindings from Georgi [1]. This is mostly a rebase of Sharat's patches [2] on the
> tip of msm-next branch.
>
> Changes from v4:
> - Squashed a patch to another one to fix Jonathan's comment
> - Add back the pm_runtime_get_if_in_use() check
>
> Changes from v3:
> - Rebased on top of Jonathan's patch which adds support for changing gpu freq
> through hfi on newer targets
> - As suggested by Rob, left the icc_path intact for pre-a6xx GPUs
>
> [1] https://kernel.googlesource.com/pub/scm/linux/kernel/git/vireshk/pm/+log/opp/linux-next/
> [2] https://patchwork.freedesktop.org/series/75291/
>
> Sharat Masetty (6):
>   dt-bindings: drm/msm/gpu: Document gpu opp table
>   drm: msm: a6xx: send opp instead of a frequency
>   drm: msm: a6xx: use dev_pm_opp_set_bw to scale DDR
>   arm64: dts: qcom: SDM845: Enable GPU DDR bw scaling
>   arm64: dts: qcom: sc7180: Add interconnects property for GPU
>   arm64: dts: qcom: sc7180: Add opp-peak-kBps to GPU opp

I can take the first two into msm-next, the 3rd will need to wait
until dev_pm_opp_set_bw() lands

Bjorn, I assume you take the last three?

BR,
-R

>
>  .../devicetree/bindings/display/msm/gpu.txt        |  28 ++++++
>  arch/arm64/boot/dts/qcom/sc7180.dtsi               |   9 ++
>  arch/arm64/boot/dts/qcom/sdm845.dtsi               |   9 ++
>  drivers/gpu/drm/msm/adreno/a6xx_gmu.c              | 108 ++++++++++++---------
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.h              |   2 +-
>  drivers/gpu/drm/msm/msm_gpu.c                      |   3 +-
>  drivers/gpu/drm/msm/msm_gpu.h                      |   3 +-
>  7 files changed, 112 insertions(+), 50 deletions(-)
>
> --
> 2.7.4
>