linux-kernel - Re: [PATCH 0/5] drm: Fix math issues in MSM DSC implementation

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Message-ID: <Yzu50ly1AxZwmyvi@matsya>
Date:   Tue, 4 Oct 2022 10:12:58 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>
Cc:     phone-devel@...r.kernel.org, Rob Clark <robdclark@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul <sean@...rly.run>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Alex Deucher <alexander.deucher@....com>,
        Douglas Anderson <dianders@...omium.org>,
        Vladimir Lypak <vladimir.lypak@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org
Subject: Re: [PATCH 0/5] drm: Fix math issues in MSM DSC implementation

On 01-10-22, 21:08, Marijn Suijten wrote:
> Various removals of complex yet unnecessary math, fixing all uses of
> drm_dsc_config::bits_per_pixel to deal with the fact that this field
> includes four fractional bits, and finally an approach for dealing with
> dsi_host setting negative values in range_bpg_offset, resulting in
> overflow inside drm_dsc_pps_payload_pack().
> 
> Note that updating the static bpg_offset array to limit the size of
> these negative values to 6 bits changes what would be written to the DPU
> hardware at register(s) DSC_RANGE_BPG_OFFSET, hence the choice has been
> made to cover up for this while packing the value into a smaller field
> instead.

Thanks for fixing these. I dont have my pixel3 availble but changes lgtm

Reviewed-by: Vinod Koul <vkoul@...nel.org>

> Altogether this series is responsible for solving _all_ Display Stream
> Compression issues and artifacts on the Sony Tama (sdm845) Akatsuki
> smartphone (2880x1440p).

Does it need two dsi lanes?

-- 
~Vinod