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

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Date:   Thu, 30 Nov 2023 16:45:27 -0800
From:   Bjorn Andersson <quic_bjorande@...cinc.com>
To:     Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.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>,
        Anton Bambura <jenneron@...tmarketos.org>
CC:     <linux-arm-msm@...r.kernel.org>,
        Rob Clark <robdclark@...omium.org>,
        <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/msm/dpu: Add missing safe_lut_tbl in sc8180x catalog

On Thu, Nov 30, 2023 at 04:35:01PM -0800, Bjorn Andersson wrote:
> Similar to SC8280XP, the misconfigured SAFE logic causes rather
> significant delays in __arm_smmu_tlb_sync(), resulting in poor
> performance for things such as USB.
> 
> Introduce appropriate SAFE values for SC8180X to correct this.
> 
> Fixes: f3af2d6ee9ab ("drm/msm/dpu: Add SC8180x to hw catalog")

Reported-by: Anton Bambura <jenneron@...tmarketos.org>

> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_5_1_sc8180x.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_5_1_sc8180x.h b/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_5_1_sc8180x.h
> index e07f4c8c25b9..9ffc8804a6fc 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_5_1_sc8180x.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_5_1_sc8180x.h
> @@ -367,6 +367,7 @@ static const struct dpu_perf_cfg sc8180x_perf_data = {
>  	.min_llcc_ib = 800000,
>  	.min_dram_ib = 800000,
>  	.danger_lut_tbl = {0xf, 0xffff, 0x0},
> +	.safe_lut_tbl = {0xfff0, 0xf000, 0xffff},
>  	.qos_lut_tbl = {
>  		{.nentry = ARRAY_SIZE(sc7180_qos_linear),
>  		.entries = sc7180_qos_linear
> 
> ---
> base-commit: 3cd3fe06ff81cfb3a969acb12a56796cff5af23d
> change-id: 20231130-sc8180x-dpu-safe-lut-ffd0df221d67
> 
> Best regards,
> -- 
> Bjorn Andersson <quic_bjorande@...cinc.com>
>