linux-kernel - Re: [PATCH v2 1/2] drm/bridge-connector: reset the HDMI connector state

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240625-jackrabbit-of-major-ampleness-e0becb@houat>
Date: Tue, 25 Jun 2024 17:49:54 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: 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>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
	Daniel Vetter <daniel@...ll.ch>, Dave Stevenson <dave.stevenson@...pberrypi.com>, 
	Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
	dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] drm/bridge-connector: reset the HDMI connector
 state

On Tue, Jun 25, 2024 at 06:05:33PM GMT, Dmitry Baryshkov wrote:
> On Tue, 25 Jun 2024 at 18:02, Maxime Ripard <mripard@...nel.org> wrote:
> >
> > Hi,
> >
> > On Sun, Jun 23, 2024 at 08:40:12AM GMT, Dmitry Baryshkov wrote:
> > > On HDMI connectors which use drm_bridge_connector and DRM_BRIDGE_OP_HDMI
> > > IGT chokes on the max_bpc property in several kms_properties tests due
> > > to the the drm_bridge_connector failing to reset HDMI-related
> > > properties.
> > >
> > > Call __drm_atomic_helper_connector_hdmi_reset() if there is a
> > > the drm_bridge_connector has bridge_hdmi.
> > >
> > > Note, the __drm_atomic_helper_connector_hdmi_reset() is moved to
> > > drm_atomic_state_helper.c because drm_bridge_connector.c can not depend
> > > on DRM_DISPLAY_HDMI_STATE_HELPER. At the same time it is impossible to
> > > call this function from HDMI bridges, there is is no function that
> > > corresponds to the drm_connector_funcs::reset().
> >
> > Why can't it depend on DRM_DISPLAY_HDMI_STATE_HELPER?
> 
> Is it okay to have DRM_KMS_HELPER to depend unconditionally or select
> DRM_DISPLAY_HDMI_STATE_HELPER?

No, but it's not clear to me why drm_bridge_connector is part of
DRM_KMS_HELPER? It doesn't seem to be called from the core but only
drivers, just like DRM_PANEL_BRIDGE which has a separate config option

Maxime

Download attachment "signature.asc" of type "application/pgp-signature" (229 bytes)