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From: "Krzysztof Hałasa" <>
To: Hans Verkuil <>
Cc: Tim Harvey <>,
	Mauro Carvalho Chehab <>,, lkml <>
Subject: Re: [PATCH REPOST] TDA1997x: replace video detection routine
Date: Fri, 23 Jul 2021 13:57:06 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <> (Hans Verkuil's message of "Fri, 23 Jul 2021 10:49:01 +0200")

Hi Hans,

Hans Verkuil <> 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.

Krzysztof "Chris" Hałasa

Sieć Badawcza Łukasiewicz
Przemysłowy Instytut Automatyki i Pomiarów PIAP
Al. Jerozolimskie 202, 02-486 Warszawa

      reply	other threads:[~2021-07-23 11:57 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-19  9:30 Krzysztof Hałasa
2021-07-21  7:12 ` Hans Verkuil
2021-07-21  7:56   ` Krzysztof Hałasa
2021-07-21 10:04     ` Hans Verkuil
2021-07-22  6:27   ` Krzysztof Hałasa
2021-07-22  6:43     ` Krzysztof Hałasa
2021-07-23  8:24       ` Hans Verkuil
2021-07-23  8:49     ` Hans Verkuil
2021-07-23 11:57       ` Krzysztof Hałasa [this message]

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