linux-kernel - Re: [PATCH v2 11/14] drm/msm/a6xx: Enable optional icc voting from OPP tables

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Message-ID: <26baf35c-cc96-3911-95bc-c675123fcc49@linaro.org>
Date:   Fri, 17 Feb 2023 23:19:56 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-arm-msm@...r.kernel.org, andersson@...nel.org,
        agross@...nel.org
Cc:     marijn.suijten@...ainline.org, Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>,
        Chia-I Wu <olvaffe@...il.com>,
        Douglas Anderson <dianders@...omium.org>,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 11/14] drm/msm/a6xx: Enable optional icc voting from
 OPP tables

On 14/02/2023 19:31, Konrad Dybcio wrote:
> On GMU-equipped GPUs, the GMU requests appropriate bandwidth votes
> for us. This is however not the case for the other GPUs. Add the
> dev_pm_opp_of_find_icc_paths() call to let the OPP framework handle
> bus voting as part of power level setting.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> ---
>   drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index d6b38bfdb3b4..b08ed127f8c4 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -2338,5 +2338,9 @@ struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
>   		msm_mmu_set_fault_handler(gpu->aspace->mmu, gpu,
>   				a6xx_fault_handler);
>   
> +	ret = dev_pm_opp_of_find_icc_paths(&pdev->dev, NULL);
> +	if (ret)
> +		return ERR_PTR(ret);
> +
>   	return gpu;
>   }

-- 
With best wishes
Dmitry