On 02/13/2014 10:47 AM, Hans Verkuil wrote:
On 02/11/14 13:03, Laurent Pinchart wrote:
Hi Hans,
On Tuesday 11 February 2014 11:09:31 Hans Verkuil wrote:
On 02/05/14 17:42, Laurent Pinchart wrote:
Replace the ADV7604-specific hotplug notifier with a GPIO to control the
HPD pin directly instead of going through the bridge driver.
Hmm, that's not going to work for me. I don't have a GPIO pin here, instead
it is a bit in a register that I have to set.
But that bit controls a GPIO, doesn't it ? In that case it should be exposed
as a GPIO controller.
I feel unhappy about losing this notifier for two reasons: first adding a GPIO
controller just to toggle a bit adds 40 lines to my driver, and that doesn't
sit well with me. It's basically completely unnecessary overhead.
I don't think it's a problem to just keep the hotplug event for now. It is
not a block for other features, so we can just leave it in.
The second reason is that in some cases you want to do something in addition
to just toggling the hotplug pin. In particular for CEC support this could be
quite useful.
In fact, if the adv7604 supports the ARC feature (Audio Return Channel), then
this is really needed because in that case the hotplug toggling would have
to be done via CEC CDC commands. However, while this webpage claims that the
ARC is supported, I can't find any other information about that.
http://www.analog.com/en/audiovideo-products/analoghdmidvi-interfaces/adv7604/products/product.html
Lars-Peter, do you know anything about ARC support in the adv7604?
No, I think that might be a mistake on the website, but I'll check with
somebody who knows more about this than me.
- Lars
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