linux-kernel - Re: [RFC] drm/panel/simple-edp: Add Samsung ATNA45DC02

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Message-ID: <CAF6AEGuBZqV4zg1asUNbMLvq0-i-iyFwfi37uKS3kWNuRSOU+g@mail.gmail.com>
Date: Wed, 17 Jul 2024 18:09:29 -0700
From: Rob Clark <robdclark@...il.com>
To: Doug Anderson <dianders@...omium.org>
Cc: dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org, 
	Rob Clark <robdclark@...omium.org>, Neil Armstrong <neil.armstrong@...aro.org>, 
	Jessica Zhang <quic_jesszhan@...cinc.com>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] drm/panel/simple-edp: Add Samsung ATNA45DC02

On Wed, Jul 17, 2024 at 5:19 PM Doug Anderson <dianders@...omium.org> wrote:
>
> Hi,
>
> On Wed, Jul 17, 2024 at 2:58 PM Rob Clark <robdclark@...il.com> wrote:
> >
> > From: Rob Clark <robdclark@...omium.org>
> >
> > Just a guess on the panel timings, but they appear to work.
> >
> > Signed-off-by: Rob Clark <robdclark@...omium.org>
> > ---
> > This adds the panel I have on my lenovo yoga slim 7x laptop.  I couldn't
> > find any datasheet so timings is just a guess.  But AFAICT everything
> > works fine.
> >
> >  drivers/gpu/drm/panel/panel-edp.c | 2 ++
> >  1 file changed, 2 insertions(+)
>
> Given that this is a Samsung ATNA<mumble>, is there any chance it's an
> OLED panel? Should it be supported with the Samsung OLED panel driver
> like this:
>
> https://lore.kernel.org/r/20240715-x1e80100-crd-backlight-v2-0-31b7f2f658a3@linaro.org

it is an OLED panel, and I did see that patchset and thought that
samsung panel driver would work.  But changing the compat string on
the yoga dts only gave me a black screen (and I didn't see any of the
other mentioned problems with bl control or dpms with panel-edp).  So
:shrug:?  It could be I overlooked something else, but it _seems_ like
panel-edp is fine for this panel. Plus, it would avoid awkwardness if
it turned out there were other non-samsung 2nd sources, but so far
with a sample size of two 100% of these laptops have the same panel
;-)

But that was the reason for posting this as an RFC.  I was hoping
someone had some hint about where to find datasheets (my google'ing
was not successful), etc.

BR,
-R