linux-kernel - Re: [PATCH v2 1/8] drm/connector: let drivers declare infoframes as unsupported

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Message-ID: <214e8bad-8ca7-405e-bdf6-90ab3a1a5d84@nxp.com>
Date: Wed, 20 Aug 2025 11:31:03 +0800
From: Liu Ying <victor.liu@....com>
To: 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>,
 Sandy Huang <hjc@...k-chips.com>, Heiko Stübner
 <heiko@...ech.de>, Andy Yan <andy.yan@...k-chips.com>,
 Chen-Yu Tsai <wens@...e.org>, Samuel Holland <samuel@...lland.org>,
 Dave Stevenson <dave.stevenson@...pberrypi.com>,
 Maíra Canal <mcanal@...lia.com>,
 Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>,
 Rob Clark <robin.clark@....qualcomm.com>, Dmitry Baryshkov
 <lumag@...nel.org>, Abhinav Kumar <abhinav.kumar@...ux.dev>,
 Jessica Zhang <jessica.zhang@....qualcomm.com>, Sean Paul <sean@...rly.run>,
 Marijn Suijten <marijn.suijten@...ainline.org>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 linux-sunxi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
 freedreno@...ts.freedesktop.org
Subject: Re: [PATCH v2 1/8] drm/connector: let drivers declare infoframes as
 unsupported

On 08/19/2025, Dmitry Baryshkov wrote:
> Currently DRM framework expects that the HDMI connector driver supports
> all infoframe types: it generates the data as required and calls into
> the driver to program all of them, letting the driver to soft-fail if
> the infoframe is unsupported. This has a major drawback on userspace
> API: the framework also registers debugfs files for all Infoframe types,
> possibly surprising the users when infoframe is visible in the debugfs
> file, but it is not visible on the wire.
> 
> Let drivers declare that they support only a subset of infoframes,
> creating a more consistent interface.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> ---
>  drivers/gpu/drm/display/drm_bridge_connector.c     |  6 ++++
>  drivers/gpu/drm/display/drm_hdmi_state_helper.c    | 37 ++++++++++++++++++++--
>  drivers/gpu/drm/drm_connector.c                    |  4 +++
>  drivers/gpu/drm/drm_debugfs.c                      | 16 +++++++---
>  drivers/gpu/drm/rockchip/inno_hdmi.c               |  1 +
>  drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c             |  1 +
>  drivers/gpu/drm/tests/drm_connector_test.c         | 28 ++++++++++++++++
>  drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c |  8 +++++
>  drivers/gpu/drm/vc4/vc4_hdmi.c                     |  5 +++
>  include/drm/drm_bridge.h                           |  7 ++++
>  include/drm/drm_connector.h                        | 22 +++++++++++++
>  11 files changed, 128 insertions(+), 7 deletions(-)

Acked-by: Liu Ying <victor.liu@....com>