> Wiadomość napisana przez Robin Murphy <robin.mur...@arm.com> w dniu
> 11.07.2022, o godz. 12:41:
>
> On 2022-06-25 16:31, Piotr Oniszczuk wrote:
>>> Wiadomość napisana przez Peter Geis <pgwipe...@gmail.com> w dniu
>>> 25.06.2022, o godz. 16:00:
>>>
>>>
>>> The first issue you have is the TV isn't responding until the absolute
>>> end.
>> I suspect this is because lack on idle gaps between cec commands sent from
>> board to tv.
>> Maybe TV sw. can't deal with consecutive commands without any idle between
>> them?
>> It is interesting that disconnecting TV - so CEC line is driven only by
>> board - rock3a still don't have any idle gaps while rock3b (and radxa 4.19
>> bsp) has them (very similar between 5.18mailine and 4.19 bsp).
>> How this is possible that change I/O from m0->m1 impacts _timings_ on free
>> hanging CEC line?
>
> Check all the pinctrl settings beyond just the function mux - pulls, drive
> strength, output type, etc. - the defaults tend to be all over the place, and
> rarely what you want.
>
> Robin.
Robin,
I'm not sure do I looked in right place...
but:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/arch/arm64/boot/dts/rockchip/rk3568-pinctrl.dtsi?h=v5.18.10#n788
vs.
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/arch/arm64/boot/dts/rockchip/rk3568-pinctrl.dtsi?h=v5.18.10#n795
are looking ok?
>
>>> This strikes me as a signal integrity issue. Do you have an
>>> oscilloscope (not a logic analyzer, you need voltages and ramp times)
>>> to compare the working vs non-working signals? Check both sides of the
>>> level shifter.
>> Indeed - i will verify this with digital oscilloscope.
>> Already ordered and must await week or 2 for delivery :-(
>> My analog oscilloscope shows correct levels and slopes "seems" to be the
>> same like in working (no memory so i can compare only visually on fuzzy
>> screen)
>> For me key is to understand why on rock3a there is no any idles between cec
>> commands - even when nothing is connected to bard (so cec is only sending
>> and nothing external impacts cec state machine)....
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