linux-kernel - Re: [PATCH v2 0/4] drm/bridge: ti-sn65dsi86: Support EDID reading

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Message-ID: <20201103061116.GD2621@vkoul-mobl>
Date:   Tue, 3 Nov 2020 11:41:16 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Sam Ravnborg <sam@...nborg.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Jonas Karlman <jonas@...boo.se>,
        LKML <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Sean Paul <seanpaul@...omium.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH v2 0/4] drm/bridge: ti-sn65dsi86: Support EDID reading

Hi,

Thanks Doug for adding me

On 02-11-20, 08:37, Doug Anderson wrote:
> > On Thu, Oct 29, 2020 at 06:17:34PM -0700, Stephen Boyd wrote:

> > Any chance we can convince you to prepare this bridge driver for use in
> > a chained bridge setup where the connector is created by the display
> > driver and uses drm_bridge_funcs?
> >
> > First step wuld be to introduce the use of a panel_bridge.
> > Then add get_edid to drm_bridge_funcs and maybe more helpers.
> >
> > Then natural final step would be to move connector creation to the
> > display driver - see how other uses drm_bridge_connector_init() to do so
> > - it is relatively simple.
> >
> > Should be doable - and reach out if you need some help.

Yes it is and doable and you find this at [1], would need a rebase
though.

> At some point I think Vinod tried to prepare a patch for this and I
> tried it, but it didn't just work.  I spent an hour or so poking at it
> and I couldn't quite figure out why and I couldn't find enough other
> examples to compare against to see what was wrong...  That was a few
> months ago, though.  Maybe things are in a better shape now?

It worked fine for me on Rb3 and db410c where we had HDMI connector. I
don't have a panel device to test and Bjorn tried to help out with a bit
of testing. This didn't work on the laptop, that is why I haven't posted
it yet.

This has conversion of msm driver and bridge drivers lt9611, adv7511 and
ti-sn65dsi86.

[1]: https://git.linaro.org/people/vinod.koul/kernel.git/log/?h=wip/msm_bridges_no_conn

Thanks
-- 
~Vinod