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Message-Id: <20241101-drm-bridge-hdmi-connector-v2-0-739ef9addf9e@linaro.org>
Date: Fri, 01 Nov 2024 12:19:01 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: 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>,
Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
Phong LE <ple@...libre.com>, Inki Dae <inki.dae@...sung.com>,
Seung-Woo Kim <sw0312.kim@...sung.com>,
Kyungmin Park <kyungmin.park@...sung.com>,
Krzysztof Kozlowski <krzk@...nel.org>,
Alim Akhtar <alim.akhtar@...sung.com>, Russell King <linux@...linux.org.uk>,
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>,
Sandy Huang <hjc@...k-chips.com>,
Heiko Stübner <heiko@...ech.de>,
Andy Yan <andy.yan@...k-chips.com>, Alain Volmat <alain.volmat@...s.st.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
linux-sound@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org, linux-mediatek@...ts.infradead.org,
linux-rockchip@...ts.infradead.org
Subject: [PATCH RFC v2 0/7] drm: add DRM HDMI Codec framework
While porting lt9611 DSI-to-HDMI bridge driver to use HDMI Connector
framework, I stumbled upon an issue while handling the Audio InfoFrames.
The HDMI codec callbacks weren't receiving the drm_atomic_state, so
there was no simple way to get the drm_connector that stayed at the end
of the bridge chain. At the same point the drm_hdmi_connector functions
expected to get drm_connector instance.
While looking for a way to solve the issue, I stumbled upon several
deficiencies in existing hdmi_codec_ops implementations. Only few of the
implementations were able to handle codec's 'plugged' callback. One
third of the drivers didn't implement the get_eld() callback.
Most of the issues can be solved if drm_connector handles
hdmi-audio-codec on its own, delegating functionality to the actual
implementation, be it a driver that implements drm_connector or
drm_bridge.
Implement such high-level framework, adding proper support for Audio
InfoFrame generation to the LT9611 driver.
Several design decisions to be kept in mind:
- drm_connector_hdmi_codec is kept as simple as possible. It implements
generic functionality (ELD, hotplug, registration).
- drm_hdmi_connector sets up HDMI codec device if the connector
is setup correspondingly (either I2S or S/PDIF is marked as
supported).
- drm_bridge_connector provides a way to link HDMI audio codec
funcionality in the drm_bridge with the drm_connector_hdmi_codec
framework.
- It might be worth reverting the no_i2s_capture / no_spdif_capture
bits. Only TDA889x driver sets them, while it's safe to assume that
most of HDMI / DP devices do not support ARC / capture. I think the
drivers should opt-in capture support rather than having to opt-out of
it.
This series is in the RFC stage, so some bits are underdocumented.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
Changes in v2:
- Use drm_atomic_get_old_connector_for_encoder in atomic_disable() to
prevent it from crashing
- Reworked HDMI codec init/exit, removing drmm_ calls (Maxime)
- Drafted the helper to be called from .detect_ctx() that performs HDMI
Connector maintenance duties (Maxime)
- Moved no_capture_mute to struct hdmi_codec_pdata
- Link to v1: https://lore.kernel.org/r/20240615-drm-bridge-hdmi-connector-v1-0-d59fc7865ab2@linaro.org
---
Dmitry Baryshkov (7):
ASoC: hdmi-codec: pass data to get_dai_id too
ASoC: hdmi-codec: move no_capture_mute to struct hdmi_codec_pdata
drm/connector: implement generic HDMI codec helpers
drm/bridge: connector: add support for HDMI codec framework
drm/bridge: lt9611: switch to using the DRM HDMI codec framework
drm/display/hdmi: implement connector update functions
drm/bridge_connector: hook __drm_atomic_helper_connector_hdmi_update_edid()
drivers/gpu/drm/Makefile | 1 +
drivers/gpu/drm/bridge/adv7511/adv7511_audio.c | 3 +-
drivers/gpu/drm/bridge/analogix/anx7625.c | 3 +-
drivers/gpu/drm/bridge/ite-it66121.c | 2 +-
drivers/gpu/drm/bridge/lontium-lt9611.c | 170 ++++++++-----------
drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 3 +-
drivers/gpu/drm/bridge/sii902x.c | 5 +-
.../gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c | 3 +-
drivers/gpu/drm/display/drm_bridge_connector.c | 160 ++++++++++++++++--
drivers/gpu/drm/display/drm_hdmi_state_helper.c | 56 +++++++
drivers/gpu/drm/drm_connector.c | 10 ++
drivers/gpu/drm/drm_connector_hdmi_codec.c | 186 +++++++++++++++++++++
drivers/gpu/drm/drm_internal.h | 5 +
drivers/gpu/drm/exynos/exynos_hdmi.c | 2 +-
drivers/gpu/drm/i2c/tda998x_drv.c | 2 +-
drivers/gpu/drm/mediatek/mtk_dp.c | 2 +-
drivers/gpu/drm/mediatek/mtk_hdmi.c | 2 +-
drivers/gpu/drm/rockchip/cdn-dp-core.c | 2 +-
drivers/gpu/drm/sti/sti_hdmi.c | 2 +-
include/drm/display/drm_hdmi_state_helper.h | 4 +
include/drm/drm_bridge.h | 23 +++
include/drm/drm_connector.h | 80 +++++++++
include/sound/hdmi-codec.h | 7 +-
sound/soc/codecs/hdmi-codec.c | 4 +-
24 files changed, 601 insertions(+), 136 deletions(-)
---
base-commit: f9f24ca362a4d84dd8aeb4b8f3ec28cb6c43dd06
change-id: 20240530-drm-bridge-hdmi-connector-9b0f6725973e
Best regards,
--
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
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