linux-kernel - Re: [PATCH v7] drm/msm/dp: reuse generic HDMI codec implementation

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Message-ID: <aFl-U-QX4T6retMq@linaro.org>
Date: Mon, 23 Jun 2025 18:18:27 +0200
From: Stephan Gerhold <stephan.gerhold@...aro.org>
To: Xilin Wu <sophon@...xa.com>
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>,
	Rob Clark <robdclark@...il.com>,
	Abhinav Kumar <quic_abhinavk@...cinc.com>,
	Sean Paul <sean@...rly.run>,
	Marijn Suijten <marijn.suijten@...ainline.org>,
	Hermes Wu <Hermes.wu@....com.tw>,
	Dmitry Baryshkov <lumag@...nel.org>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org
Subject: Re: [PATCH v7] drm/msm/dp: reuse generic HDMI codec implementation

On Thu, May 29, 2025 at 10:40:12AM +0800, Xilin Wu wrote:
> On 2025/4/24 01:52:45, Dmitry Baryshkov wrote:
> > From: Dmitry Baryshkov <lumag@...nel.org>
> > 
> > The MSM DisplayPort driver implements several HDMI codec functions
> > in the driver, e.g. it manually manages HDMI codec device registration,
> > returning ELD and plugged_cb support. In order to reduce code
> > duplication reuse drm_hdmi_audio_* helpers and drm_bridge_connector
> > integration.
> > 
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> > ---
> > A lot of DisplayPort bridges use HDMI Codec in order to provide audio
> > support. Present DRM HDMI Audio support has been written with the HDMI
> > and in particular DRM HDMI Connector framework support, however those
> > audio helpers can be easily reused for DisplayPort drivers too.
> > 
> > Patches by Hermes Wu that targeted implementing HDMI Audio support in
> > the iTE IT6506 driver pointed out the necessity of allowing one to use
> > generic audio helpers for DisplayPort drivers, as otherwise each driver
> > has to manually (and correctly) implement the get_eld() and plugged_cb
> > support.
> > 
> > Implement necessary integration in drm_bridge_connector and provide an
> > example implementation in the msm/dp driver.
> > ---
> > Changes in v7:
> > - Dropped applied patches
> > - Link to v6: https://lore.kernel.org/r/20250314-dp-hdmi-audio-v6-0-dbd228fa73d7@oss.qualcomm.com
> > 
> > Changes in v6:
> > - Added DRM_BRIDGE_OP_DP_AUDIO and separate set of DisplayPort audio
> >    callbacks to the drm_bridge interface (Maxime)
> > - Link to v5: https://lore.kernel.org/r/20250307-dp-hdmi-audio-v5-0-f3be215fdb78@linaro.org
> > 
> > Changes in v5:
> > - Rebased on top of linux-next, also handling HDMI audio piece of the
> >    MSM HDMI driver.
> > - Link to v4: https://lore.kernel.org/r/20250301-dp-hdmi-audio-v4-0-82739daf28cc@linaro.org
> > 
> > Changes in v4:
> > - Rebased on linux-next, adding DRM_BRIDGE_OP_HDMI_AUDIO to Synopsys QP
> >    HDMI driver.
> > - Drop outdated comment regarding subconnector from the commit message.
> > - Link to v3: https://lore.kernel.org/r/20250219-dp-hdmi-audio-v3-0-42900f034b40@linaro.org
> > 
> > Changes in v3:
> > - Dropped DRM_BRIDGE_OP_DisplayPort, added DRM_BRIDGE_OP_HDMI_AUDIO
> >    (Laurent, Maxime)
> > - Dropped the subconnector patch (again)
> > - Link to v2: https://lore.kernel.org/r/20250209-dp-hdmi-audio-v2-0-16db6ebf22ff@linaro.org
> > 
> > Changes in v2:
> > - Added drm_connector_attach_dp_subconnector_property() patches
> > - Link to v1: https://lore.kernel.org/r/20250206-dp-hdmi-audio-v1-0-8aa14a8c0d4d@linaro.org
> > ---
> >   drivers/gpu/drm/msm/Kconfig         |   1 +
> >   drivers/gpu/drm/msm/dp/dp_audio.c   | 131 ++++--------------------------------
> >   drivers/gpu/drm/msm/dp/dp_audio.h   |  27 ++------
> >   drivers/gpu/drm/msm/dp/dp_display.c |  28 ++------
> >   drivers/gpu/drm/msm/dp/dp_display.h |   6 --
> >   drivers/gpu/drm/msm/dp/dp_drm.c     |   8 +++
> >   6 files changed, 31 insertions(+), 170 deletions(-)
> > 
> 
> This change breaks DP audio on the qcs6490 platform, tested on kernel
> next-20250528.
> 
> [    0.368035] [drm:dpu_kms_hw_init:1173] dpu hardware revision:0x70020000
> [    0.369359] hdmi-audio-codec hdmi-audio-codec.0.auto: hdmi_codec_probe:
> dai_count 0
> [    0.369362] hdmi-audio-codec hdmi-audio-codec.0.auto: hdmi_codec_probe:
> Missing hw_params
> [    0.369364] hdmi-audio-codec hdmi-audio-codec.0.auto: hdmi_codec_probe:
> Invalid parameters
> [    0.369366] hdmi-audio-codec hdmi-audio-codec.0.auto: probe with driver
> hdmi-audio-codec failed with error -22
> [    0.370536] [drm] Initialized msm 1.12.0 for ae01000.display-controller
> on minor 0
> 
> Manually reverting this change solves the problem.
> 

Try applying the following patch, the current code in next/mainline is
broken and de-references some wrong memory. Probably pure luck that it
ever worked during testing. :/

https://lore.kernel.org/dri-devel/20250620011616.118-1-kernel@airkyi.com/

Thanks,
Stephan