linux-kernel - Re: [PATCH v3 2/2] drm/bridge: add support for lontium lt8713sx bridge driver

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Message-ID: <91290a53-8f59-4138-9899-4523d25e1cff@web.de>
Date: Mon, 29 Dec 2025 13:40:10 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: Prahlad Valluru <vvalluru@....qualcomm.com>,
 Vishnu Saini <vishnu.saini@....qualcomm.com>,
 dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
 Andrzej Hajda <andrzej.hajda@...el.com>, Conor Dooley <conor+dt@...nel.org>,
 David Airlie <airlied@...il.com>, Jernej Skrabec <jernej.skrabec@...il.com>,
 Jonas Karlman <jonas@...boo.se>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>,
 Neil Armstrong <neil.armstrong@...aro.org>, Rob Herring <robh@...nel.org>,
 Robert Foss <rfoss@...nel.org>, Simona Vetter <simona@...ll.ch>,
 syyang@...tium.com, Thomas Zimmermann <tzimmermann@...e.de>
Cc: Prahlad Valluru <prahlad.valluru@....qualcomm.com>,
 LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] drm/bridge: add support for lontium lt8713sx
 bridge driver

…
> +++ b/drivers/gpu/drm/bridge/lontium-lt8713sx.c
> @@ -0,0 +1,682 @@
…
> +static int lt8713sx_firmware_update(struct lt8713sx *lt8713sx)
> +{
> +	int ret = 0;
> +
> +	mutex_lock(&lt8713sx->ocm_lock);
> +	lt8713sx_i2c_enable(lt8713sx);
…
> +	mutex_unlock(&lt8713sx->ocm_lock);
> +
> +	return ret;
> +}
…

Under which circumstances would you become interested to apply a statement
like “guard(mutex)(&lt8713sx->ocm_lock);”?
https://elixir.bootlin.com/linux/v6.19-rc2/source/include/linux/mutex.h#L253

Regards,
Markus