[Letux-kernel] Pyra display driver once again broken in v5.2-rc1

[Andreas Kemnade]

On Mon, 27 May 2019 21:25:41 +0200
"H. Nikolaus Schaller" <hns at goldelico.com> wrote:

> > Am 27.05.2019 um 14:46 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
> > 
> > Hi,
> > unfortunately every year or so some upstream change breaks
> > our (still out-of tree) DSI panel driver for the Pyra(Phone).
> > This time it happened with v5.2-rc1.
> > 
> > v5.2-rc1 also broke the GTA04 display and the L3704/L7004 displays,
> > but those are DPI panels and the reasons were two separate
> > issues which have nothing to do with the Pyra DSI panel.
> > 
> > There have been some API changes for DSI panel drivers and
> > I have done a
> > 
> > 	git diff v5.2-rc1 v5.1 drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
> > 
> > to identify them and tried to apply similar patches to our
> > panel. But still the driver is successfully probed, but shows
> > not activity. No calls to enable() or connect(). Backlight stays
> > black. And as a result there is also no /dev/fb0, text console
> > or X11.
> > 
> > Unfortunately, it has not improved after upgrading to v5.2-rc2.
> > 
> > So once again it appears that I have to git bisect upstream
> > patches to find out what is going on...  
> 
> After spending more hours... it does not seem to be in our patches
> and the panel driver is likely almost correct now.
> 
> I believe this because I also found not working:
> * dwc3 (usb3/otg port)
> * bq24297 battery charger driver (my Pyra fortunately runs well enough with U-Boot initialization)
> * tca6424 (gpio expander - we use the pcal9524 variant)
> 
> The tca6424 driver seems to be broken (not loaded).
> 
[    6.581432] ts3a227e 4-003b: Cannot request irq 0 (-22)
[    6.597252] ts3a227e: probe of 4-003b failed with error -22

so somehow it insists of having an irq and we are not providing one in
the dtb, at least not in pyra-mainboard-v5.1.dtsi

Regards,
Andreas