linux-kernel - Re: [PATCH v2 2/4] [media] platform: Add Synopsys Designware HDMI RX Controller Driver

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Date:   Fri, 16 Jun 2017 17:59:46 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Jose Abreu <Jose.Abreu@...opsys.com>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Cc:     Carlos Palminha <CARLOS.PALMINHA@...opsys.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hans.verkuil@...co.com>
Subject: Re: [PATCH v2 2/4] [media] platform: Add Synopsys Designware HDMI RX
 Controller Driver

On 06/16/2017 05:52 PM, Jose Abreu wrote:
> Hi Hans,
> 
> 
> On 16-06-2017 14:44, Hans Verkuil wrote:
>>
>>>> <snip>
>>>>
>>>>> +	/* 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).

Well, if it is ready, then just send a v3!

> 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

I had the same thought. It doesn't really fit for CEC adapters on
HDMI receivers.

Perhaps edid-phandle? Or something else?

Regards,

	Hans