linux-kernel - Re: [PATCH v17 6/6] drm/bridge: display-connector: add ddc-en gpio support

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Date:   Thu, 7 Apr 2022 13:15:58 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Paul Boddie <paul@...die.org.uk>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Paul Cercueil <paul@...pouillou.net>,
        Maxime Ripard <maxime@...no.tech>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-mips@...r.kernel.org,
        letux-kernel@...nphoenux.org
Subject: Re: [PATCH v17 6/6] drm/bridge: display-connector: add ddc-en gpio
 support

Hi Laurent,

> Am 07.04.2022 um 09:30 schrieb Laurent Pinchart <laurent.pinchart@...asonboard.com>:
> 
> Hi Nikolaus,
> 
> Thank you for the patch.
> 
> On Wed, Apr 06, 2022 at 06:26:08PM +0200, H. Nikolaus Schaller wrote:
>> "hdmi-connector.yaml" bindings defines an optional property
>> "ddc-en-gpios" for a single gpio to enable DDC operation.
>> 
>> Usually this controls +5V power on the HDMI connector.
>> This +5V may also be needed for HPD.
>> 
>> This was not reflected in code but is needed to make the CI20
>> board work.
>> 
>> Now, the driver activates the ddc gpio after probe and
>> deactivates after remove so it is "almost on".
>> 
>> But only if this driver is loaded (and not e.g. blacklisted
>> as module).
>> 
>> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

Added to v18 (which is needed to remove some now redundant patches
and fix a detail in the ingenic-drm driver).

BR and thanks for review,
Nikolaus