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@xxxxxxxxxxx>
