linux-kernel - Re: [PATCH v2 11/17] drm/msm/dpu: Disable MDP vsync source selection on DPU 5.0.0 and above

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Date:   Thu, 20 Apr 2023 23:51:35 +0200
From:   Marijn Suijten <marijn.suijten@...ainline.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Adam Skladowski <a39.skl@...il.com>,
        Loic Poulain <loic.poulain@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Robert Foss <rfoss@...nel.org>, Vinod Koul <vkoul@...nel.org>,
        Rajesh Yadav <ryadav@...eaurora.org>,
        Jeykumar Sankaran <jsanka@...eaurora.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Chandan Uddaraju <chandanu@...eaurora.org>,
        ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Jordan Crouse <jordan@...micpenguin.net>,
        Archit Taneja <architt@...eaurora.org>,
        Sravanthi Kollukuduru <skolluku@...eaurora.org>
Subject: Re: [PATCH v2 11/17] drm/msm/dpu: Disable MDP vsync source selection
 on DPU 5.0.0 and above

On 2023-04-20 04:03:31, Dmitry Baryshkov wrote:
[..]
> >>>    -static void dpu_hw_setup_vsync_source(struct dpu_hw_mdp *mdp,
> >>> +static void dpu_hw_setup_vsync_source_v1(struct dpu_hw_mdp *mdp,
> >>>            struct dpu_vsync_source_cfg *cfg)
> >>
> >> In my opinion _v1 is not really descriptive here. Could you please rename it to dpu_hw_setup_vsync_source_no_vsync_sel() ?
> > v1 refers to the CTL rev 100 a.k.a 1.0.0 a.k.a 1, but that's not
> > yet very well formulated upstream.. if we even need it..

I think v1 just refers to "the first next variant of this function",
similar to how for example Microsoft COM APIs start without a suffix,
then get 1, 2, 3 etc appended as new variants "of the same" trickle in.

> Yeah, but this mdp_top, not the ctl. And for CTL I'd probably rename _v1 
> to _active to follow actual feature name.

Correct, I just got lazily inspired by downstream here.  There it
switches on SDE_MDP_VSYNC_SEL which is based on DPU >= 5.0.0 as
explained in the patch.

> >> Or maybe rename dpu_hw_setup_vsync_source() to dpu_hw_setup_vsync_source_vsync_sel() and drop _v1 from this function.

Maybe add _and_ in there?

> >>
> >> Up to you.

- Marijn