Re: [PATCH 2/2] drm/panel: simple: Add timings for Raspberry Pi 7" panel

[Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>]

Hi,

On 23/04/2026 16:54, Marek Vasut wrote:
> On 4/23/26 3:16 PM, Tomi Valkeinen wrote:
> 
> Hello Tomi,
> 
>>>> In the past I used this panel compat instead of the
>>>> panel-raspberrypi-touchscreen.c and it worked.
>>>> IIRC Marek splitted the multi-function module into a regulator and the
>>>> panel description.
>>> Ok... Indeed https://pip.raspberrypi.com/categories/651-pcn lists 
>>> PH800480T013 as one of the panels used. Although two variants are 
>>> listed, and also a third panel model, possibly from another vendor.
>>>
>>> My module is v1.1, and I think it has the PH800480T013-IAC21 D/5624/ 
>>> KIT- LC variant.
>> A question to Marek: Where did you get the timings for PH800480T013? 
>> Did you find a datasheet?
> Search engine first link:
> 
> https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/5337/ 
> PH800480T013-IHC09.pdf

I tested the "powertip,ph800480t013-idf02". I'm using BeagleY-AI here, 
and it didn't work at all. After some testing, I figured out these:

HSW of 2 is much too small. But this could be an issue on the display 
controller or the DSI encoder side. HWS of around 8 starts to work ok. 
Below that, I don't get anything on the screen.

The syncs are interesting. I set them to DISPLAY_FLAGS_VSYNC_HIGH | 
DISPLAY_FLAGS_HSYNC_HIGH, Marek to DRM_MODE_FLAG_NVSYNC | 
DRM_MODE_FLAG_NHSYNC. But I have sent the TC358762 series, which fixes 
the syncs that the bridge sends 
(20260327-tc358762-fixes-v2-0-3589d3c45f4a@ideasonboard.com).

Flipping the syncs might explain why I used 46 and 23 as the 
backporches, Marked used 46-hsw and 23-vsw for backporches (well, 
Marek's vbp was off by one as I mentioned).

But now I'm getting unsure if my TC358762 fixed the syncs correctly... 
I'm pretty sure I measured those with my scope, though.

The fps is different, too. I aimed for 60fps, Marek for 50fps (I think, 
it doesn't match exactly).

In any case... I think I have to dig out my scope again and validate 
that I see exactly what I have in the driver. Btw, reviews for the 
TC358762 series is appreciated!

  Tomi