linux-kernel - [PATCH v2 0/4] Add HDMI 2.0 support to DW HDMI QP TX

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Message-Id: <20260113-dw-hdmi-qp-scramb-v2-0-ae7b2c58d24d@collabora.com>
Date: Tue, 13 Jan 2026 00:26:17 +0200
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
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>, 
 Sandy Huang <hjc@...k-chips.com>, 
 Heiko Stübner <heiko@...ech.de>, 
 Andy Yan <andy.yan@...k-chips.com>
Cc: kernel@...labora.com, dri-devel@...ts.freedesktop.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-rockchip@...ts.infradead.org, 
 Diederik de Haas <diederik@...ow-tech.com>, 
 Maud Spierings <maud_spierings@...mail.com>
Subject: [PATCH v2 0/4] Add HDMI 2.0 support to DW HDMI QP TX

This patch series provides the missing support for high TMDS clock ratio
and scrambling to DW HDMI QP TX library, required for handling HDMI 2.0
display modes on RK3576 & RK3588 SoCs.

In order to allow addressing the SCDC status lost on sink disconnects,
it adds an atomic variant of the drm_bridge_funcs.detect callback and a
new drm_bridge_detect_ctx() helper, which is further used in
drm_bridge_connector to switch to ->detect_ctx hook.

Furthermore, it optimizes HPD event handling in dw_hdmi_qp Rockchip
platform driver to run the detect cycle on the affected connector only.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
---
Changes in v2:
- Collected Tested-by tags from Diederik and Maud
- Rebased onto latest drm-misc-next
- Ensured the recently introduced 'no-hpd' support for dealing with
  unconnected/repurposed/broken HPD pin is limited to HDMI 1.4 rates
- Link to v1: https://lore.kernel.org/r/20251203-dw-hdmi-qp-scramb-v1-0-836fe7401a69@collabora.com

---
Cristian Ciocaltea (4):
      drm/bridge: Add ->detect_ctx hook and drm_bridge_detect_ctx()
      drm/bridge-connector: Switch to using ->detect_ctx hook
      drm/bridge: dw-hdmi-qp: Add high TMDS clock ratio and scrambling support
      drm/rockchip: dw_hdmi_qp: Do not send HPD events for all connectors

 drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c   | 184 ++++++++++++++++++++++---
 drivers/gpu/drm/display/drm_bridge_connector.c |  73 +++++-----
 drivers/gpu/drm/drm_bridge.c                   |  58 ++++++++
 drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c |  44 +++---
 include/drm/drm_bridge.h                       |  30 ++++
 5 files changed, 313 insertions(+), 76 deletions(-)
---
base-commit: 38feb171b3f92d77e8061fafb5ddfffc2c13b672
change-id: 20251203-dw-hdmi-qp-scramb-cdbd8b57ccf9