linux-kernel - Re: [PATCH v2 5/8] drm/msm/dpu: Reject topologies for which no DSC blocks are available

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Date:   Mon, 9 Jan 2023 01:29:15 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>,
        phone-devel@...r.kernel.org, Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Vinod Koul <vkoul@...nel.org>
Cc:     ~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>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Stephen Boyd <swboyd@...omium.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Jessica Zhang <quic_jesszhan@...cinc.com>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Jani Nikula <jani.nikula@...el.com>,
        sunliming <sunliming@...inos.cn>,
        Sam Ravnborg <sam@...nborg.org>,
        Haowen Bai <baihaowen@...zu.com>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Loic Poulain <loic.poulain@...aro.org>,
        Vinod Polimera <quic_vpolimer@...cinc.com>,
        Douglas Anderson <dianders@...omium.org>,
        Vladimir Lypak <vladimir.lypak@...il.com>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/8] drm/msm/dpu: Reject topologies for which no DSC
 blocks are available

On 22/12/2022 01:19, Marijn Suijten wrote:
> Resource allocation of DSC blocks should behave more like LMs and CTLs
> where NULL resources (based on initial hw_blk creation via definitions
> in the catalog) are skipped ^1.  The current hardcoded mapping of DSC
> blocks however means that resource allocation shouldn't succeed at all
> when the DSC block on the corresponding index doesn't exist, rather than
> searching for the next free block.
> 
> This hardcoded mapping should be loosened separately as DPU 5.0.0
> introduced a crossbar where DSC blocks can be "somewhat" freely bound to
> any PP and CTL (in proper pairs).
> 
> ^1: which, on hardware that supports DSC, can happen after a git rebase
> ended up moving additions to _dpu_cfg to a different struct which has
> the same patch context.
> 
> Fixes: f2803ee91a41 ("drm/msm/disp/dpu1: Add DSC support in RM")
> Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c | 5 +++++
>   1 file changed, 5 insertions(+)

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

-- 
With best wishes
Dmitry