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

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Date:   Mon, 12 Jul 2021 09:11:30 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Kalyan Thota <kalyan_t@...eaurora.org>
Cc:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, robdclark@...il.com,
        dianders@...omium.org, mkrishn@...eaurora.org,
        rnayak@...eaurora.org
Subject: Re: [v1] drm/msm/disp/dpu1: add safe lut config in dpu driver

On 2021-07-09 16:10, Kalyan Thota 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.
> 
> 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

Tested-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org> 
(sc7280, sc7180)

This will need fixes and stable tag and I think this should also fix the
wait-for-safe issue with sdm845 (ufs/usb speed slowdown with display 
active)
which we have in arm-smmu-qcom.

Thanks,
Sai

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