linux-kernel - Re: [v1] drm/msm/disp/dpu1: add safe lut config in dpu driver

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Message-ID: <CAA8EJpp9nRhpE5HP+qzmSsY6_8XTW0yXqj_Hx0WvV8F3cnTcAQ@mail.gmail.com>
Date:   Fri, 9 Jul 2021 14:38:13 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Kalyan Thota <kalyan_t@...eaurora.org>
Cc:     "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <dri-devel@...ts.freedesktop.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Rob Clark <robdclark@...il.com>,
        Douglas Anderson <dianders@...omium.org>,
        Krishna Manikandan <mkrishn@...eaurora.org>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Rajendra Nayak <rnayak@...eaurora.org>
Subject: Re: [v1] drm/msm/disp/dpu1: add safe lut config in dpu driver

On Fri, 9 Jul 2021 at 13:41, Kalyan Thota <kalyan_t@...eaurora.org> wrote:
>
> Add safe lut configuration for all the targets in dpu
> driver as per QOS recommendation.
>
> Issue reported on SC7280:
>
> With wait-for-safe feature in smmu enabled, RT client
> buffer levels are checked to be safe before smmu invalidation.
> Since display was always set to unsafe it was delaying the
> invalidaiton process thus impacting the performance on NRT clients
> such as eMMC and NVMe.
>
> Validated this change on SC7280, With this change eMMC performance
> has improved significantly.

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

It might be a good option to push it to the stable tree also.

>
> Signed-off-by: Kalyan Thota <kalyan_t@...eaurora.org>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> index d01c4c9..2e482cd 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> @@ -974,6 +974,7 @@ static const struct dpu_perf_cfg sdm845_perf_data = {
>         .amortizable_threshold = 25,
>         .min_prefill_lines = 24,
>         .danger_lut_tbl = {0xf, 0xffff, 0x0},
> +       .safe_lut_tbl = {0xfff0, 0xf000, 0xffff},
>         .qos_lut_tbl = {
>                 {.nentry = ARRAY_SIZE(sdm845_qos_linear),
>                 .entries = sdm845_qos_linear
> @@ -1001,6 +1002,7 @@ static const struct dpu_perf_cfg sc7180_perf_data = {
>         .min_dram_ib = 1600000,
>         .min_prefill_lines = 24,
>         .danger_lut_tbl = {0xff, 0xffff, 0x0},
> +       .safe_lut_tbl = {0xfff0, 0xff00, 0xffff},
>         .qos_lut_tbl = {
>                 {.nentry = ARRAY_SIZE(sc7180_qos_linear),
>                 .entries = sc7180_qos_linear
> @@ -1028,6 +1030,7 @@ static const struct dpu_perf_cfg sm8150_perf_data = {
>         .min_dram_ib = 800000,
>         .min_prefill_lines = 24,
>         .danger_lut_tbl = {0xf, 0xffff, 0x0},
> +       .safe_lut_tbl = {0xfff8, 0xf000, 0xffff},
>         .qos_lut_tbl = {
>                 {.nentry = ARRAY_SIZE(sm8150_qos_linear),
>                 .entries = sm8150_qos_linear
> @@ -1056,6 +1059,7 @@ static const struct dpu_perf_cfg sm8250_perf_data = {
>         .min_dram_ib = 800000,
>         .min_prefill_lines = 35,
>         .danger_lut_tbl = {0xf, 0xffff, 0x0},
> +       .safe_lut_tbl = {0xfff0, 0xff00, 0xffff},
>         .qos_lut_tbl = {
>                 {.nentry = ARRAY_SIZE(sc7180_qos_linear),
>                 .entries = sc7180_qos_linear
> @@ -1084,6 +1088,7 @@ static const struct dpu_perf_cfg sc7280_perf_data = {
>         .min_dram_ib = 1600000,
>         .min_prefill_lines = 24,
>         .danger_lut_tbl = {0xffff, 0xffff, 0x0},
> +       .safe_lut_tbl = {0xff00, 0xff00, 0xffff},
>         .qos_lut_tbl = {
>                 {.nentry = ARRAY_SIZE(sc7180_qos_macrotile),
>                 .entries = sc7180_qos_macrotile
> --
> 2.7.4
>


-- 
With best wishes
Dmitry