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Mon, 30 Oct 2023 16:23:59 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1781224693015514702 X-GMAIL-MSGID: 1781224693015514702 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. Fixes: 4a352c2fc15a ("drm/msm/dpu: Introduce SC8280XP") Cc: stable@vger.kernel.org Suggested-by: Doug Anderson Suggested-by: Rob Clark Signed-off-by: Bjorn Andersson Tested-by: Johan Hovold Tested-by: Steev Klimaszewski Reviewed-by: Abhinav Kumar --- drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_8_0_sc8280xp.h | 1 + 1 file changed, 1 insertion(+) --- base-commit: c503e3eec382ac708ee7adf874add37b77c5d312 change-id: 20231030-sc8280xp-dpu-safe-lut-9769027b8452 Best regards, diff --git a/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_8_0_sc8280xp.h b/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_8_0_sc8280xp.h index 1ccd1edd693c..4c0528794e7a 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_8_0_sc8280xp.h +++ b/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_8_0_sc8280xp.h @@ -406,6 +406,7 @@ static const struct dpu_perf_cfg sc8280xp_perf_data = { .min_llcc_ib = 0, .min_dram_ib = 800000, .danger_lut_tbl = {0xf, 0xffff, 0x0}, + .safe_lut_tbl = {0xfe00, 0xfe00, 0xffff}, .qos_lut_tbl = { {.nentry = ARRAY_SIZE(sc8180x_qos_linear), .entries = sc8180x_qos_linear