linux-kernel - Re: [PATCH v4 06/14] drm/msm/a6xx: Remove both GBIF and RBBM GBIF halt on hw init

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Message-ID: <2b0506b7-1a3a-b45a-8514-42066231d2ea@linaro.org>
Date:   Tue, 28 Mar 2023 18:35:10 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.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>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>
Cc:     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 v4 06/14] drm/msm/a6xx: Remove both GBIF and RBBM GBIF
 halt on hw init

On 14/03/2023 17:28, Konrad Dybcio wrote:
> Currently we're only deasserting REG_A6XX_RBBM_GBIF_HALT, but we also
> need REG_A6XX_GBIF_HALT to be set to 0. For GMU-equipped GPUs this is
> done in a6xx_bus_clear_pending_transactions(), but for the GMU-less
> ones we have to do it *somewhere*. Unhalting both side by side sounds
> like a good plan and it won't cause any issues if it's unnecessary.
> 
> Also, add a memory barrier to ensure it's gone through.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>   drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)

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

-- 
With best wishes
Dmitry