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

[Andreas Kemnade]

On Wed, 29 May 2019 06:39:22 +0200
"H. Nikolaus Schaller" <hns at goldelico.com> wrote:

> > Am 28.05.2019 um 23:40 schrieb Andreas Kemnade <andreas at kemnade.info>:
> > 
> > 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  
> 
> The reference is set in pyra-mainboard-v5.2.dtsi
> 
... which is as far as I understand not used on a 5.1 board.

> 		interrupt-parent = <&gpio99>;
> 		interrupts = <14 IRQ_TYPE_EDGE_RISING>;
> 
> But: this is another symptom of the tca6424 (gpio99) not being available.
> It is not only a gpio expander but also an interrupt expander.

so it an independant problem.
> 
> So we should focus on finding out why the tca6424 / pcal6524 does
> not probe.

yes, I disabled the hdmi stuff completely. Result: Display works.

Regards,
Andreas
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