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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <6335ae3a-0370-92ed-9bc8-d8448db50627@linaro.org>
Date:   Fri, 21 Apr 2023 01:28:11 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Marijn Suijten <marijn.suijten@...ainline.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 21/04/2023 00:51, Marijn Suijten wrote:
> 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?

Either way will work.

>>>> Up to you.
> 
> - Marijn

-- 
With best wishes
Dmitry