[Letux-kernel] Pyra display driver once again broken in v5.2-rc1
andreas at kemnade.info
Wed May 29 20:38:57 CEST 2019
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
> 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.
after disabling that invert write I see
root at letux:~# dmesg | grep ts3a
[ 6.913371] ts3a227e 4-003b: Cannot request irq 0 (-22)
[ 6.932368] ts3a227e: probe of 4-003b failed with error -22
so it is an indepandant problem an least on board 5.1. It might work on
board version 5.2
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