Re: [PATCH v2 2/4] [media] platform: Add Synopsys Designware HDMI RX Controller Driver
From: Jose Abreu
Date: Fri Jun 16 2017 - 11:53:08 EST
On 16-06-2017 14:44, Hans Verkuil wrote:
>>>> + /* CEC */
>>>> + dw_dev->cec_adap = cec_allocate_adapter(&dw_hdmi_cec_adap_ops,
>>>> + dw_dev, dev_name(dev), CEC_CAP_TRANSMIT |
>>>> + CEC_CAP_PHYS_ADDR | CEC_CAP_LOG_ADDRS,
>>> Add CEC_CAP_RC and CEC_CAP_PASSTHROUGH.
>>> I'm not sure about CEC_CAP_PHYS_ADDR. The problem here is that this driver
>>> doesn't handle the EDID, but without that it doesn't know what physical
>>> address to use.
>>> I wonder if the cec-notifier can be used for this, possibly with adaptations.
>>> Relying on users to set the physical address is a last resort since it is very
>>> painful to do so. cec-notifier was specifically designed to solve this.
>> Yes, EDID ROM is not integrated into the controller so I can't
>> add the code. How exactly can I use cec-notifier here?
> drivers/media/platform/sti/cec/stih-cec.c is a good example. The notifier is
> called by drivers/gpu/drm/sti/sti_hdmi.c.
Done! Implemented and working :) I'm wondering if you want me to
wait some more time for other comments or just send the v3 now? I
also added support for SCDC read request (its a matter of
activating a bit).
BTW, I used the DT node name "hdmi-phandle" but I don't know if
it is the best because it can cause confusion about the
hdmi-phandle that you documented in media/cec.txt
Jose Miguel Abreu