linux-kernel - Re: [PATCH v2 6/6] drm/meson: encoder_cvbs: switch to bridge with ATTACH_NO

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Message-ID: <7a921d1d-84b4-c3e4-8f7c-10db5ad42ecf@baylibre.com>
Date:   Mon, 18 Oct 2021 09:40:03 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        sam@...nborg.org
Cc:     daniel@...ll.ch, Laurent.pinchart@...asonboard.com,
        dri-devel@...ts.freedesktop.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/6] drm/meson: encoder_cvbs: switch to bridge with
 ATTACH_NO_CONNECTOR

Hi,

On 16/10/2021 00:34, Martin Blumenstingl wrote:
> Hi Neil, Hi Sam,
> 
> On Fri, Oct 15, 2021 at 4:11 PM Neil Armstrong <narmstrong@...libre.com> wrote:
> [...]
>> +static const struct drm_bridge_funcs meson_encoder_cvbs_bridge_funcs = {
>> +       .attach = meson_encoder_cvbs_attach,
>> +       .enable = meson_encoder_cvbs_enable,
>> +       .disable = meson_encoder_cvbs_disable,
>> +       .mode_valid = meson_encoder_cvbs_mode_valid,
>> +       .get_modes = meson_encoder_cvbs_get_modes,
>> +       .atomic_enable = meson_encoder_cvbs_atomic_enable,
> I did some testing on boards where u-boot doesn't initialize the video outputs.
> It seems that meson_encoder_cvbs_enable() is never called with this patch.
> meson_encoder_cvbs_atomic_enable() is called though.
> 
> From what I can see in drm_bridge.c [0] this is even expected.
> Does this mean that we need to move all logic from .enable to
> .atomic_enable (and same with .disable -> moving that logic to
> .atomic_disable)?
> 
> The same comment applies to the HDMI patch.

Good point, I'll fix that for both patches !

Neil

> 
> 
> Best regards,
> Martin
> 
> 
> [0] https://elixir.bootlin.com/linux/v5.15-rc5/source/drivers/gpu/drm/drm_bridge.c#L717
>