Messages in this thread | | | From | Krzysztof Hałasa <> | Subject | Re: [PATCH REPOST] TDA1997x: replace video detection routine | Date | Fri, 23 Jul 2021 13:57:06 +0200 |
| |
Hi Hans,
Hans Verkuil <hverkuil@xs4all.nl> writes:
> The tda1997x doesn't have any method of obtaining the sync polarities? > > HSync and VSync are, as you say, using in-band signaling, but the 'polarity' > still matters when it comes to detecting timings. All HDMI receivers I have > ever seen have a register that reports the polarities. I find it *very* hard > to imagine that this device doesn't support that.
I didn't know that HDMI serializers send the logical levels of those lines, I thought some frame/field/line start/end codes are sent instead. I will have to have a closer look at this chip, then.
> Do you have a datasheet for this device?
No, there is only the current driver and also the old one (in Gateworks' Freescale/NXP kernel). Tim may have something perhaps under NDA, maaybe.
I will see if I can find these bits in the registers.
Thanks. -- Krzysztof "Chris" Hałasa
Sieć Badawcza Łukasiewicz Przemysłowy Instytut Automatyki i Pomiarów PIAP Al. Jerozolimskie 202, 02-486 Warszawa
| |