Hi Laurent,
On 12/3/2015 9:41 PM, Archit Taneja wrote:
On 12/3/2015 9:25 PM, Rob Clark wrote:
On Thu, Dec 3, 2015 at 10:28 AM, Laurent Pinchart
<laurent.pinchart@xxxxxxxxxxxxxxxx> wrote:
On Thursday 03 December 2015 10:02:02 Rob Clark wrote:
On Mon, Jul 27, 2015 at 4:59 AM, Laurent Pinchart wrote:
On Monday 27 July 2015 11:46:57 Archit Taneja wrote:
ADV7511 is represented as an i2c drm slave encoder device.
ADV7533, on
the other hand, is going be a normal i2c client device creating
bridge
and connector entities.
<snip>
Laurent, as we'd discussed in the past, I did an initial study of how
we could map bridge ops to the encoder slave ops, and change it for the
rcar kms driver (and others) that might use adv7511.
The drm_encoder_slave_funcs ops are a superset of bridge ops. The
rcar-du driver uses a subset of these ops (encoder-like ops) to
implement the hdmi encoder (rcar_du_hdmienc.c) and the other
(connector-like ops)for implementing the hdmi connector
(rcar_du_hdmicon.c)
We have two options:
1. If we want to use drm_bridge as it is, the rcar driver shouldn't
create a hdmi connector anymore, and rely on the adv7511 driver to make
a connector for it. This is the easiest way, but it will break the nice
representation of the hardware in DT.
2. We add more drm_bridge ops (the ones that implement the connector
ops), and make the hdmi connector created by rcar-du use these bridge
ops.
Both these options have issues. The 2) one is the probably the better of
the two, but I don't know if adding more ops to the bridge is the right
way to go.
Therefore, I don't know how we can solve this straight away. If there is
more debate needed on this, then it is probably easier to get adv7533
support in, and then figure out how two merge the two.
I gave approach (1) a try. I modified the rcar-du driver to use bridge
instead of i2c slave encoder and posted a RFC [1]. The hdmi connector
DT nodes (like in r8a7790-lager.dts) aren't really used by the rcar-du
driver. Now, with the adv7511 driver creating its own connector, they
mean even much less.
The adv7511 refactor from i2c slave encoder to bridge is done in [2].
[1] http://marc.info/?l=dri-devel&m=145235835902378&w=1
[2] http://marc.info/?l=dri-devel&m=145235823602353&w=1
Could you please review and test?
Thanks,
Archit
BR,
-R
--
Regards,
Laurent Pinchart
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