linux-kernel - Re: [REGRESSION] omapdrm/N900 display broken

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Date:   Fri, 27 Nov 2020 10:43:28 +0200
From:   Tomi Valkeinen <tomi.valkeinen@...com>
To:     Daniel Vetter <daniel@...ll.ch>
CC:     Aaro Koskinen <aaro.koskinen@....fi>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>,
        Tony Lindgren <tony@...mide.com>,
        linux-omap <linux-omap@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [REGRESSION] omapdrm/N900 display broken

On 25/11/2020 11:07, Daniel Vetter wrote:

>> Laurent, does this ring any bells? The WARN comes in drm_atomic_bridge_chain_enable() when
>> drm_atomic_get_old_bridge_state() returns null for (presumably) sdi bridge.
>>
>> I'm not sure why the bridge state would not be there.
> 
> Lack of state on first modeset usually means your
> drm_mode_config_reset didn't create one. Or whatever it is you're
> using. I didn't look whether you're wiring this up correctly or not.
> We might even want to add a ->reset function to
> drm_private_state_funcs to make this work for everyone.

The bridge driver set atomic_enable and atomic_disable, but no other atomic funcs. It was supposed
to set the legacy enable & disable.

 Tomi

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