linux-kernel - [PATCH 0/1] Pass down connector to drm bridge detect hook

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Message-ID: <20250321085345.136380-1-andyshrk@163.com>
Date: Fri, 21 Mar 2025 16:53:37 +0800
From: Andy Yan <andyshrk@....com>
To: lumag@...nel.org
Cc: mripard@...nel.org,
	neil.armstrong@...aro.org,
	dri-devel@...ts.freedesktop.org,
	dianders@...omium.org,
	jani.nikula@...el.com,
	lyude@...hat.com,
	jonathanh@...dia.com,
	p.zabel@...gutronix.de,
	simona@...ll.ch,
	victor.liu@....com,
	rfoss@...nel.org,
	chunkuang.hu@...nel.org,
	cristian.ciocaltea@...labora.com,
	Laurent.pinchart@...asonboard.com,
	linux-arm-msm@...r.kernel.org,
	linux-mediatek@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	freedreno@...ts.freedesktop.org,
	Andy Yan <andy.yan@...k-chips.com>
Subject: [PATCH 0/1] Pass down connector to drm bridge detect hook

From: Andy Yan <andy.yan@...k-chips.com>


In some application scenarios, we hope to get the corresponding
connector when the bridge's detect hook is invoked.

For example, we may want to call drm_dp_read_sink_count_cap(which needs
a drm_connector) at the dp deteck hook, intel_dp and nouveau_dp do this
at it's connector's detetc_ctx/detect hook.

But for a bridge driver, it's detect hook is initiated by the connector,
there is no connector passed down.

In most cases, we can get the connector by drm_atomic_get_connector_for_encoder
if the encoder attached to the bridge is enabled, however there will
still be some scenarios where the detect hook of the bridge is called
but the corresponding encoder has not been enabled yet. For instance,
this occurs when the device is hot plug in for the first time.

Since the call to bridge's detect is initiated by the connector, passing
down the corresponding connector directly will make things simpler.

Before preparing this patch, we have had some discussions on the details
here[0].

[0]https://patchwork.freedesktop.org/patch/640712/?series=143573&rev=5


Andy Yan (1):
  drm/bridge: Pass down connector to drm bridge detect hook

 drivers/gpu/drm/bridge/adv7511/adv7511_drv.c          |  3 ++-
 drivers/gpu/drm/bridge/analogix/anx7625.c             |  2 +-
 drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c   |  3 ++-
 drivers/gpu/drm/bridge/chrontel-ch7033.c              |  2 +-
 drivers/gpu/drm/bridge/display-connector.c            | 11 ++++++++---
 drivers/gpu/drm/bridge/ite-it6263.c                   |  3 ++-
 drivers/gpu/drm/bridge/ite-it6505.c                   |  2 +-
 drivers/gpu/drm/bridge/ite-it66121.c                  |  3 ++-
 drivers/gpu/drm/bridge/lontium-lt8912b.c              |  6 +++---
 drivers/gpu/drm/bridge/lontium-lt9611.c               |  3 ++-
 drivers/gpu/drm/bridge/lontium-lt9611uxc.c            |  3 ++-
 .../gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c  |  3 ++-
 drivers/gpu/drm/bridge/sii902x.c                      |  3 ++-
 drivers/gpu/drm/bridge/simple-bridge.c                |  2 +-
 drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c          |  2 +-
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c             |  3 ++-
 drivers/gpu/drm/bridge/tc358767.c                     |  5 +++--
 drivers/gpu/drm/bridge/ti-sn65dsi86.c                 |  3 ++-
 drivers/gpu/drm/bridge/ti-tfp410.c                    |  2 +-
 drivers/gpu/drm/bridge/ti-tpd12s015.c                 |  8 +++++++-
 drivers/gpu/drm/display/drm_bridge_connector.c        |  2 +-
 drivers/gpu/drm/drm_bridge.c                          |  5 +++--
 drivers/gpu/drm/mediatek/mtk_dp.c                     |  3 ++-
 drivers/gpu/drm/mediatek/mtk_hdmi.c                   |  3 ++-
 drivers/gpu/drm/msm/dp/dp_drm.c                       |  3 ++-
 drivers/gpu/drm/msm/hdmi/hdmi.h                       |  2 +-
 drivers/gpu/drm/msm/hdmi/hdmi_bridge.c                |  2 +-
 drivers/gpu/drm/msm/hdmi/hdmi_hpd.c                   |  4 ++--
 drivers/gpu/drm/xlnx/zynqmp_dp.c                      |  3 ++-
 include/drm/drm_bridge.h                              |  6 ++++--
 30 files changed, 67 insertions(+), 38 deletions(-)

-- 
2.43.0