2009/12/23 Alex Deucher :

2009/12/22 Christian König :

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Hi,

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due i see a lot of HDMI support here some questions came into my mind:

Will HDMI-CEC be possible/supported ? Is there somewhere a list which chips/boards support HDMI-CEC ? The same question was asked on phoronix recently (http://www.phoronix.com/forums/showthread.php?p=102598). Dave Airlie noted that its probably connected to one of the GPIO pins of

Am Dienstag, den 22.12.2009, 12:51 +0100 schrieb Petric Frank: the chipset. So I played around with the CEC line a bit, trying to figure out at which pin it's connect, but have been unsuccessfully so far.

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From a quick check with a multimeter I can confirm that at least on my RV710 the wire is connected to something, and the HDMI standard states that if you don't support CEC at all you should leave the wire as an open end. So my conclusion is that's theoretically support in hardware, but at least I don't know how.

@Dave and Alex: I definitely don't want to steal your time, but you guys know the hardware much better than I do. I understand the basics of the gpio pins, but don't know at which register range I should look for something like this (besides the documented HPD and I2C pins). Could you give me a hint?

I'm not that familiar with HDMI-CEC, but I'm pretty sure it doesn't use any gpio pins, rather I think it's handled by the hdmi block itself.

Well its a single PIN on the connector that is used so its like HPD in its requirements hence why I expect if its wired anywhere it'll be to a random GPIO somewhere. Its an out-of-band protocol (not sure if its i2c) to turn on/off HDMI devices etc. Dave.

Alex

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2009/12/22 Christian König :

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Well its a single PIN on the connector that is used so its like HPD in its requirements hence why I expect if its wired anywhere it'll be to a random GPIO somewhere.

Its an out-of-band protocol (not sure if its i2c) to turn on/off HDMI devices etc. Nope not i2c, but similar. CEC is a very slow (around 300bps) one wire

Am Mittwoch, den 23.12.2009, 08:44 +1000 schrieb Dave Airlie: protocol, with multiplexed clock/data. You can control a bunch of different thinks with this, input select, volume control, deck control (play, stop pause etc..) and (that's the interesting part) low level remote control key codes. And yes connecting this to an GPIO pin would make sense, with this low baud rates you could read it by just polling the bit.

I can control my television, bluray player and AV-receiver just with the remote of my AV-receiver, if I could replace my lirc driven remote with CEC, I could control all my home cinema with only one remote. That sounds quite promising to me.

If it is a gpio, I would suggest walking the record tree for the hdmi connector in the object header and looking for a gpio record. Alex -- To unsubscribe, e-mail: radeonhd+unsubscribe@opensuse.org For additional commands, e-mail: radeonhd+help@opensuse.org

Hello, On Tuesday 22 December 2009 23:44:03 Dave Airlie wrote:

2009/12/23 Alex Deucher :

...

2009/12/22 Christian König :

...

Hi,

Am Dienstag, den 22.12.2009, 12:51 +0100 schrieb Petric Frank:

...

due i see a lot of HDMI support here some questions came into my mind:

Will HDMI-CEC be possible/supported ? Is there somewhere a list which chips/boards support HDMI-CEC ?

The same question was asked on phoronix recently (http://www.phoronix.com/forums/showthread.php?p=102598). Dave Airlie noted that its probably connected to one of the GPIO pins of the chipset. So I played around with the CEC line a bit, trying to figure out at which pin it's connect, but have been unsuccessfully so far.

...

From a quick check with a multimeter I can confirm that at least on my

RV710 the wire is connected to something, and the HDMI standard states that if you don't support CEC at all you should leave the wire as an open end. So my conclusion is that's theoretically support in hardware, but at least I don't know how.

@Dave and Alex: I definitely don't want to steal your time, but you guys know the hardware much better than I do. I understand the basics of the gpio pins, but don't know at which register range I should look for something like this (besides the documented HPD and I2C pins). Could you give me a hint?

I'm not that familiar with HDMI-CEC, but I'm pretty sure it doesn't use any gpio pins, rather I think it's handled by the hdmi block itself.

Well its a single PIN on the connector that is used so its like HPD in its requirements hence why I expect if its wired anywhere it'll be to a random GPIO somewhere.

I my opinion this "somewhere" seems to be the main problem. I am not firm in this area, but a possible solution may be: - Connect your PC via HDMI to your TV-set (or whatever have a remote control) - Start a (to be written) program to scan all (possible/unused ?) GPIO-ports instantly - Switch the TV-set on and off via the remote control - The program finds (somehow) the activity on one of the GPIO ports and reports it.

Its an out-of-band protocol (not sure if its i2c) to turn on/off HDMI devices etc.

Not only - also steering it (Play, Stop, ...) is possible. From what i have read (may be wrong) every (raw) code of the remote control is sent via the CEC channel. regards Petric -- To unsubscribe, e-mail: radeonhd+unsubscribe@opensuse.org For additional commands, e-mail: radeonhd+help@opensuse.org