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

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Date:   Fri, 23 Sep 2022 11:18:26 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Neil Armstrong <neil.armstrong@...aro.org>
Cc:     Stefan Agner <stefan@...er.ch>, 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>,
        linux-amlogic@...ts.infradead.org
Subject: Re: [PATCH 5.15 247/779] drm/meson: encoder_hdmi: switch to bridge
 DRM_BRIDGE_ATTACH_NO_CONNECTOR

On Fri, Sep 23, 2022 at 11:12:02AM +0200, Neil Armstrong wrote:
> Hi Greg,
> 
> On 13/09/2022 13:22, Greg Kroah-Hartman wrote:
> > 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.
> 
> Backport of 7cd70656d128 ("drm/bridge: display-connector: implement bus fmts callbacks") is still missing in 5.15-stable.

I see it in the 5.15.68 release as commit 590b4f10e3a4.

What am I missing?

confused,

greg k-h