2009/12/23 Alex Deucher
2009/12/22 Christian König
: Hi,
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.
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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