linux-kernel - Re: [PATCH 5.15 247/779] drm/meson: encoder_hdmi: switch to bridge DRM_BRIDGE_ATTACH_NO

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Date:   Tue, 13 Sep 2022 13:22:40 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Stefan Agner <stefan@...er.ch>
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Sam Ravnborg <sam@...nborg.org>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.15 247/779] drm/meson: encoder_hdmi: switch to bridge
 DRM_BRIDGE_ATTACH_NO_CONNECTOR

On Mon, Sep 12, 2022 at 08:48:24PM +0200, Stefan Agner wrote:
> On 2022-09-12 18:08, Stefan Agner wrote:
> > On 2022-08-15 19:58, Greg Kroah-Hartman wrote:
> >> From: Neil Armstrong <narmstrong@...libre.com>
> >>
> >> [ Upstream commit 0af5e0b41110e2da872030395231ab19c45be931 ]
> >>
> >> This implements the necessary change to no more use the embedded
> >> connector in dw-hdmi and use the dedicated bridge connector driver
> >> by passing DRM_BRIDGE_ATTACH_NO_CONNECTOR to the bridge attach call.
> >>
> >> The necessary connector properties are added to handle the same
> >> functionalities as the embedded dw-hdmi connector, i.e. the HDR
> >> metadata, the CEC notifier & other flags.
> >>
> >> The dw-hdmi output_port is set to 1 in order to look for a connector
> >> next bridge in order to get DRM_BRIDGE_ATTACH_NO_CONNECTOR working.
> > 
> > HDMI on ODROID-N2+ was working with v5.15.60, and stopped working with
> > v5.15.61. Reverting this commit (and two dependent refcount leak) to be
> > the culprit. Reverting just the refcount leaks is not enough to get HDMI
> > working, so I assume it is this commit.
> > 
> > I haven't investigated much beyond that, maybe its simple a case of a
> > missing kernel configuration? DRM_DISPLAY_CONNECTOR is compiled, and the
> > module display_connector is loaded, so that part seemed to have worked.
> > 
> > Any ideas welcome.
> > 
> > FWIW, I track the issue in the HAOS tracker at
> > https://github.com/home-assistant/operating-system/issues/2120.
> 
> It seems that backporting commit 7cd70656d128 ("drm/bridge:
> display-connector: implement bus fmts callbacks") fixes the problem
> without reverting this commit.
> 
> @Greg, can we backport this commit as well?

sure, now queued up, thanks.

greg k-h