linux-kernel - Re: [PATCH] drm/msm/dpu: Add missing safe_lut

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Date:   Tue, 21 Nov 2023 10:40:23 -0800
From:   Abhinav Kumar <quic_abhinavk@...cinc.com>
To:     Rob Clark <robdclark@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>,
        "Daniel Vetter" <daniel@...ll.ch>,
        Bjorn Andersson <andersson@...nel.org>,
        "Kuogee Hsieh" <quic_khsieh@...cinc.com>,
        Bjorn Andersson <quic_bjorande@...cinc.com>
CC:     Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Johan Hovold <johan@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <stable@...r.kernel.org>, Doug Anderson <dianders@...omium.org>,
        Rob Clark <robdclark@...omium.org>
Subject: Re: [PATCH] drm/msm/dpu: Add missing safe_lut_tbl in sc8280xp catalog


On Mon, 30 Oct 2023 16:23:20 -0700, Bjorn Andersson wrote:
> During USB transfers on the SC8280XP __arm_smmu_tlb_sync() is seen to
> typically take 1-2ms to complete. As expected this results in poor
> performance, something that has been mitigated by proposing running the
> iommu in non-strict mode (boot with iommu.strict=0).
> 
> This turns out to be related to the SAFE logic, and programming the QOS
> SAFE values in the DPU (per suggestion from Rob and Doug) reduces the
> TLB sync time to below 10us, which means significant less time spent
> with interrupts disabled and a significant boost in throughput.
> 
> [...]

Applied, thanks!

[1/1] drm/msm/dpu: Add missing safe_lut_tbl in sc8280xp catalog
      https://gitlab.freedesktop.org/drm/msm/-/commit/a33b2431d11b

Best regards,
-- 
Abhinav Kumar <quic_abhinavk@...cinc.com>