[PATCHv9 07/15] cec: add HDMI CEC framework

[Hans Verkuil]

On 10/14/2015 12:51 AM, Russell King - ARM Linux wrote:
> On Mon, Oct 12, 2015 at 01:35:54PM +0200, Hans Verkuil wrote:
>> On 10/06/2015 07:06 PM, Russell King - ARM Linux wrote:
>>> Surely you aren't proposing that drivers should write directly to
>>> adap->phys_addr without calling some notification function that the
>>> physical address has changed?
>>
>> Userspace is informed through CEC_EVENT_STATE_CHANGE when the adapter is
>> enabled/disabled. When the adapter is enabled and CEC_CAP_PHYS_ADDR is
>> not set (i.e. the kernel takes care of this), then calling CEC_ADAP_G_PHYS_ADDR
>> returns the new physical address.
> 
> Okay, so when I see the EDID arrive, I should be doing:
> 
>                 phys = parse_hdmi_addr(block->edid);
>                 cec->adap->phys_addr = phys;
>                 cec_enable(cec->adap, true);
> 
> IOW, you _are_ expecting adap->phys_addr to be written, but only while
> the adapter is disabled?

Right.

And when the hotplug goes down you should call cec_enable(cec->adap, false).
While the adapter is disabled, CEC_ADAP_G_PHYS_ADDR will always return
CEC_PHYS_ADDR_INVALID regardless of the cec->adap->phys_addr value.

Regards,

	Hans