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

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Message-ID: <d5vfynn6ba4fwkaw7cegzillhw5qkl5z5huw2xb347j3tv7gnu@etgiotbc2x3r>
Date: Thu, 18 Jul 2024 15:31:55 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Rob Clark <robdclark@...il.com>
Cc: Doug Anderson <dianders@...omium.org>, 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 06:09:29PM GMT, Rob Clark wrote:
> 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.

Panelook has a datasheet for ATNA45DC01. It's behind a 'register new
business email' paywall.

> 
> BR,
> -R

-- 
With best wishes
Dmitry