Re: [PATCH 1/4] dt-bindings: display: panel: samsung, atna33xc20: Add ATNA40HQ08-0

[Rob Herring <robh@kernel.org>]

On Thu, Jun 04, 2026 at 02:23:25PM -0700, Doug Anderson wrote:
> Hi,
> 
> On Thu, Jun 4, 2026 at 1:07 AM Konrad Dybcio
> <konrad.dybcio@oss.qualcomm.com> wrote:
> >
> > Some variants of the Qualcomm Snapdragon X2 Elite-based Lenovo Yoga
> > Slim 7x Gen11 laptop ship with a Samsung ATNA40HQ08-0 2880x1800 120 Hz
> > OLED panel which seems to be compatible with the other ATNAxxx panels,
> > document it.
> >
> > Note that I stripped the -0 suffix from the compatible, as it seems to
> > be of little importance and some sources omit it.
> >
> > EDID:
> > 0000000 ff00 ffff ffff 00ff 834c 422f 002f 0000
> > 0000010 2300 0401 1eb5 7813 6603 ae85 3851 24b9
> > 0000020 500a 0054 0000 0101 0101 0101 0101 0101
> > 0000030 0101 0101 0101 0000 0000 0000 0000 0000
> > 0000040 0000 0000 0000 0000 0000 fd00 1e00 e678
> > 0000050 47e6 0a01 2020 2020 2020 0000 fe00 5300
> > 0000060 4344 2020 2020 2020 2020 2020 0000 fc00
> > 0000070 4100 4e54 3441 4830 3051 2d38 2030 c402
> > 0000080 2070 0279 2000 1800 1200 2ffb 0042 0000
> > 0000090 0000 0c23 5441 414e 3034 5148 3830 302d
> > 00000a0 0021 ca1d 5e0b 4007 080b 0007 7ae5 8551
> > 00000b0 b9a3 024a 020a 5445 5fd0 644c 4400 7823
> > 00000c0 0026 0609 0000 0000 5000 0000 0022 0014
> > 00000d0 0ad4 3f85 c70b 0700 1f00 0700 7707 4f00
> > 00000e0 0f00 2e00 0600 4500 5fd0 644c 002b 270c
> > 00000f0 1e00 0077 2700 1e00 003b 0000 0000 9085
> > 0000100 2070 0079 2200 1400 d400 050a 0b3f 00c7
> > 0000110 0007 001f 0707 07f7 07cf 000f 0081 731f
> > 0000120 001a 0300 1e5b 0078 8fa0 6a02 7802 0000
> > 0000130 0000 e38d 8005 e600 0506 8f01 016a 0000
> > 0000140 0000 0000 0000 0000 0000 0000 0000 0000
> > 0000150 0000 0000 0000 0000 0000 0000 0000 0000
> > 0000160 0000 0000 0000 0000 0000 0000 0000 0000
> > 0000170 0000 0000 0000 0000 0000 0000 0000 900f
> 
> I'm not a fan of the EDID being presented in 16-bit words. :-/
> Changing it to this when applying:
> 
> 00 ff ff ff ff ff ff 00 4c 83 2f 42 2f 00 00 00
> 00 23 01 04 b5 1e 13 78 03 66 85 ae 51 38 b9 24
> 0a 50 54 00 00 00 01 01 01 01 01 01 01 01 01 01
> 01 01 01 01 01 01 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 fd 00 1e 78 e6
> e6 47 01 0a 20 20 20 20 20 20 00 00 00 fe 00 53
> 44 43 20 20 20 20 20 20 20 20 20 20 00 00 00 fc
> 00 41 54 4e 41 34 30 48 51 30 38 2d 30 20 02 c4
> 70 20 79 02 00 20 00 18 00 12 fb 2f 42 00 00 00
> 00 00 23 0c 41 54 4e 41 34 30 48 51 30 38 2d 30
> 21 00 1d ca 0b 5e 07 40 0b 08 07 00 e5 7a 51 85
> a3 b9 4a 02 0a 02 45 54 d0 5f 4c 64 00 44 23 78
> 26 00 09 06 00 00 00 00 00 50 00 00 22 00 14 00
> d4 0a 85 3f 0b c7 00 07 00 1f 00 07 07 77 00 4f
> 00 0f 00 2e 00 06 00 45 d0 5f 4c 64 2b 00 0c 27
> 00 1e 77 00 00 27 00 1e 3b 00 00 00 00 00 85 90
> 70 20 79 00 00 22 00 14 00 d4 0a 05 3f 0b c7 00
> 07 00 1f 00 07 07 f7 07 cf 07 0f 00 81 00 1f 73
> 1a 00 00 03 5b 1e 78 00 a0 8f 02 6a 02 78 00 00
> 00 00 8d e3 05 80 00 e6 06 05 01 8f 6a 01 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0f 90
> 
> 
> > Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
> > ---
> >  Documentation/devicetree/bindings/display/panel/samsung,atna33xc20.yaml | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/display/panel/samsung,atna33xc20.yaml b/Documentation/devicetree/bindings/display/panel/samsung,atna33xc20.yaml
> > index 1bbe0da3997c3b06eccd18fe8980b58a6c05d963..27536eeaed8594c047dd0fa1cf425912be189508 100644
> > --- a/Documentation/devicetree/bindings/display/panel/samsung,atna33xc20.yaml
> > +++ b/Documentation/devicetree/bindings/display/panel/samsung,atna33xc20.yaml
> > @@ -25,6 +25,8 @@ properties:
> >                - samsung,atna40ct06
> >                # Samsung 14" WQXGA+ (2880x1800 pixels) eDP AMOLED panel
> >                - samsung,atna40cu11
> > +              # Samsung 14" WQXGA+ (2880x1800 pixels) eDP AMOLED panel
> > +              - samsung,atna40hq08
> 
> Sure. I'll repeat the same comment I made the last time someone landed
> a change to this file [1] in the hopes that maybe someone will post a
> patch one day:
> 
> <repeat>
> Given how many of these we're up to now, I'm starting to wonder if we
> should come up with a generic compatible like we did with "edp-panel"
> and then we can stop having to merge CLs like this. All of these
> Samsung OLED eDP panels have the same power up sequence and once we do
> that then we can read them via EDID or via DP AUX bus to identify
> which specific panel we have and if they need additional tweaking,
> just like we do with "edp-panel". Do DT folks have any opinion about
> that? Coming up with a name would be a pain since I wouldn't want to
> assert that all future Samsung OLED eDP panels will have the same
> powerup sequence. Maybe "samsung,amoled-edp-panel-v1" even though that
> sounds terrible and there's no known need for a "-v2"?
> </repeat>

If things are the same, then perhaps there should be a fallback 
compatible. Or just reuse an existing compatible. I can in no way 
prevent someone from using 'foo-panel' in their DT when the h/w is 
actually a foobar panel if the differences are transparent to s/w. (But 
I will reject a quirk property later on when foobar turns out to be 
different than foo.)

Rob