linux-kernel - [PATCH v2 0/3] drm/display: hdmi: provide common code to get Audio Clock Recovery params

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Message-Id: <20250408-drm-hdmi-acr-v2-0-dee7298ab1af@oss.qualcomm.com>
Date: Tue, 08 Apr 2025 16:54:24 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: 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>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Maíra Canal <mcanal@...lia.com>,
        Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.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>,
        Dmitry Baryshkov <lumag@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org
Subject: [PATCH v2 0/3] drm/display: hdmi: provide common code to get Audio
 Clock Recovery params

HDMI standards define a recommended set of values to be used for Audio
Clock Regeneration. Nevertheless, each HDMI driver dealing with audio
implements its own way to determine those values. Implement a common
helper and use it for MSM HDMI (tested), VC4 and DW-HDMI (compile-tested
only) drivers.

Note, this helper simply implements the database for these values (HDMI
Section 7.2). The question of selecting supported formats and rates
should be handled by sound/soc/codecs/hdmi-codec.c (pretty much like it
is handled by sound/pci/hda/patch_hdmi.c).

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
Changes in v2:
- Added missing EXPORT_SYMBOL(drm_hdmi_acr_get_n_cts) (LKP)
- Extended documentation to explicitly mention L-PCM (Maxime)
- Dropped VC4 and rockchip patchets as I'm not able to test them.
- Link to v1: https://lore.kernel.org/r/20250309-drm-hdmi-acr-v1-0-bb9c242f4d4b@linaro.org

---
Dmitry Baryshkov (3):
      drm/display: hdmi: provide central data authority for ACR params
      drm/msm/hdmi: move msm_hdmi_audio_update() out of msm_hdmi_set_timings()
      drm/msm/hdmi: use new helper for ACR tables

 drivers/gpu/drm/display/drm_hdmi_helper.c | 168 ++++++++++++++++++++++++++++++
 drivers/gpu/drm/msm/hdmi/hdmi_audio.c     | 107 ++-----------------
 drivers/gpu/drm/msm/hdmi/hdmi_bridge.c    |   8 +-
 include/drm/display/drm_hdmi_helper.h     |   6 ++
 4 files changed, 186 insertions(+), 103 deletions(-)
---
base-commit: 2bdde620f7f2bff2ff1cb7dc166859eaa0c78a7c
change-id: 20250308-drm-hdmi-acr-7ad1f0d012df

Best regards,
-- 
Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>