linux-kernel - Re: [PATCH v3 3/3] drm/bridge: sii9234: use extcon cable detection logic to detect MHL

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Message-ID: <c649f29d3c0c6cb5718dfec1159fdaabe3ee3463.camel@grimler.se>
Date: Thu, 04 Sep 2025 09:04:11 +0200
From: Henrik Grimler <henrik@...mler.se>
To: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>, Andrzej Hajda	
 <andrzej.hajda@...el.com>, Neil Armstrong <neil.armstrong@...aro.org>, 
 Robert Foss <rfoss@...nel.org>, Laurent Pinchart
 <Laurent.pinchart@...asonboard.com>, Jonas Karlman	 <jonas@...boo.se>,
 Jernej Skrabec <jernej.skrabec@...il.com>, Maarten Lankhorst	
 <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, 	dri-devel@...ts.freedesktop.org,
 linux-samsung-soc@...r.kernel.org, 	~postmarketos/upstreaming@...ts.sr.ht,
 replicant@...osl.org, 	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] drm/bridge: sii9234: use extcon cable detection
 logic to detect MHL

Hi Marek,

On Thu, 2025-09-04 at 08:40 +0200, Marek Szyprowski wrote:
> On 03.09.2025 21:32, Henrik Grimler wrote:
> > On Mon, Aug 25, 2025 at 04:16:50PM +0200, Marek Szyprowski wrote:
> > > On 24.08.2025 13:16, Henrik Grimler wrote:
> > > > To use MHL we currently need the MHL chip to be permanently on,
> > > > which
> > > > consumes unnecessary power. Let's use extcon attached to MUIC
> > > > to enable
> > > > the MHL chip only if it detects an MHL cable.
> > > > 
> > > > Signed-off-by: Henrik Grimler <henrik@...mler.se>
> > > Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>
> > > 
> > > On Trats2 board the status of HDMI connector is no properly
> > > reported as
> > > disconnected when no cable is attached.
> > Thanks for testing (again)!
> > 
> > In what way is it not properly reported as disconnected, are you
> > checking some sysfs property, or with some userspace tool?
> 
> Huh, my typo. It should be 'connector is *now* properly reported', 
> that's why I gave my 'tested-by' tag.

That clears it up, thank you :)

Best regards,
Henrik Grimler