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

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Message-ID: <532937cb-fa69-4010-b2cf-cba9a2e6c730@samsung.com>
Date: Thu, 4 Sep 2025 08:40:42 +0200
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: Henrik Grimler <henrik@...mler.se>
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

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.

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland