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

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Message-ID: <b9aa1178-5848-70fd-2dc1-9f36d845985e@linaro.org>
Date:   Fri, 23 Sep 2022 11:30:21 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.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

Hi,

On 23/09/2022 11:18, Greg Kroah-Hartman wrote:
> 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?

Nothing, must be tired, was looking git log in the wrong path...

> 
> confused,

Sorry for the noise,
Neil

> 
> greg k-h