linux-kernel - Re: [PATCH v2 1/3] drm/msm/disp: Tweak display snapshot to match gpu snapshot

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Date:   Thu, 16 Dec 2021 00:00:08 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Rob Clark <robdclark@...il.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Rob Clark <robdclark@...omium.org>,
        Sean Paul <sean@...rly.run>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Guo Zhengkui <guozhengkui@...o.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Fernando Ramos <greenfoo@....eu>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] drm/msm/disp: Tweak display snapshot to match gpu snapshot

On Wed, 15 Dec 2021 at 23:09, Rob Clark <robdclark@...il.com> wrote:
>
> On Wed, Dec 15, 2021 at 11:17 AM Dmitry Baryshkov
> <dmitry.baryshkov@...aro.org> wrote:
> >
> > On Wed, 15 Dec 2021 at 20:49, Rob Clark <robdclark@...il.com> wrote:
> > >
> > > From: Rob Clark <robdclark@...omium.org>
> > >
> > > Add UTS_RELEASE and show timestamp the same way for consistency.
> > >
> > > Signed-off-by: Rob Clark <robdclark@...omium.org>
> >
> > Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> >
> > > ---
> > >  drivers/gpu/drm/msm/disp/msm_disp_snapshot.h      | 4 ++--
> > >  drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c | 9 ++++++---
> > >  2 files changed, 8 insertions(+), 5 deletions(-)
> >
> > We should pull this out of disp/, it's no longer disp-specific.
>
> Or possibly just move dsi/etc into disp?  It is disp specific in the
> sense that dumping GPU state works quite differently..

Not sure about this.  dsi/hdmi/dp seem to be perfect top-level
entities. I see your point here, however I'd rather prefer to move
mdp4/mdp5/dpu1 out of disp subdir rather than pushing all non-GPU code
into disp/

When I tried to move dsi/phy to a separate phy driver, I reworked
msm_disp_snapshot by splitting some parts into lib/ code. But I can
not say that I completely liked what I did. Partially it was one of
the reasons for me not pushing the dsi/phy patchset past RFC.

-- 
With best wishes
Dmitry