linux-kernel - Re: [PATCH v3 07/10] drm/display: hdmi_state_helper: reject Audio IF updates if it's not supported

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Message-ID: <mccxwmemwxp4fcyjiu3zofuydk5ahmhnluqucwau5a6aiw67xr@52gynmrblml3>
Date: Wed, 7 Jan 2026 15:21:38 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Maxime Ripard <mripard@...nel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Maíra Canal <mcanal@...lia.com>,
        Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>,
        Chen-Yu Tsai <wens@...nel.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        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>, Liu Ying <victor.liu@....com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
        Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jesszhan0024@...il.com>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Sandy Huang <hjc@...k-chips.com>,
        Heiko Stübner <heiko@...ech.de>,
        Andy Yan <andy.yan@...k-chips.com>, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-mediatek@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v3 07/10] drm/display: hdmi_state_helper: reject Audio IF
 updates if it's not supported

On Wed, Jan 07, 2026 at 01:50:51PM +0100, Maxime Ripard wrote:
> Hi,
> 
> On Wed, Dec 24, 2025 at 03:02:56AM +0200, Dmitry Baryshkov wrote:
> > Updating the InfoFrame if it can not be sent over the wire makes no
> > sense. Change drm_atomic_helper_connector_hdmi_update_audio_infoframe()
> > and drm_atomic_helper_connector_hdmi_clear_audio_infoframe() to return
> > an error if Audio InfoFrame callbacks are not implemented.
> > 
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> 
> IIRC, audio infoframes are mandatory if you send audio over the cable,
> so maybe we should do like you did for drmm_connector_hdmi_init and
> error in drm_connector_hdmi_audio_init if we don't have the proper
> write_infoframe hook set?

HDMI hosts can be sending Audio InfoFrames in some other way (think
about LT9611UXC, which manages infoframes on its own).

-- 
With best wishes
Dmitry