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Message-Id: <20240809-hotplug-drm-bridge-v3-3-b4c178380bc9@bootlin.com>
Date: Fri, 09 Aug 2024 17:34:51 +0200
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, 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>, Daniel Vetter <daniel@...ll.ch>,
Derek Kiernan <derek.kiernan@....com>,
Dragan Cvetic <dragan.cvetic@....com>, Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Saravana Kannan <saravanak@...gle.com>,
Wolfram Sang <wsa+renesas@...g-engineering.com>,
"Rafael J. Wysocki" <rafael@...nel.org>
Cc: Paul Kocialkowski <contact@...lk.fr>,
Hervé Codina <herve.codina@...tlin.com>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
linux-i2c@...r.kernel.org,
Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
Luca Ceresoli <luca.ceresoli@...tlin.com>
Subject: [PATCH v3 3/7] drm/encoder: add drm_encoder_cleanup_from()
Supporting hardware whose final part of the DRM pipeline can be physically
removed requires the ability to detach all bridges from a given point to
the end of the pipeline.
Introduce a variant of drm_encoder_cleanup() for this.
Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>
---
Changes in v3: none
Changed in v2:
- fix a typo in a comment
---
drivers/gpu/drm/drm_encoder.c | 21 +++++++++++++++++++++
include/drm/drm_encoder.h | 1 +
2 files changed, 22 insertions(+)
diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c
index 8f2bc6a28482..472dfbefe296 100644
--- a/drivers/gpu/drm/drm_encoder.c
+++ b/drivers/gpu/drm/drm_encoder.c
@@ -207,6 +207,27 @@ void drm_encoder_cleanup(struct drm_encoder *encoder)
}
EXPORT_SYMBOL(drm_encoder_cleanup);
+/**
+ * drm_encoder_cleanup_from - remove a given bridge and all the following
+ * @encoder: encoder whole list of bridges shall be pruned
+ * @bridge: first bridge to remove
+ *
+ * Removes from an encoder all the bridges starting with a given bridge
+ * and until the end of the chain.
+ *
+ * This should not be used in "normal" DRM pipelines. It is only useful for
+ * devices whose final part of the DRM chain can be physically removed and
+ * later reconnected (possibly with different hardware).
+ */
+void drm_encoder_cleanup_from(struct drm_encoder *encoder, struct drm_bridge *bridge)
+{
+ struct drm_bridge *next;
+
+ list_for_each_entry_safe_from(bridge, next, &encoder->bridge_chain, chain_node)
+ drm_bridge_detach(bridge);
+}
+EXPORT_SYMBOL(drm_encoder_cleanup_from);
+
static void drmm_encoder_alloc_release(struct drm_device *dev, void *ptr)
{
struct drm_encoder *encoder = ptr;
diff --git a/include/drm/drm_encoder.h b/include/drm/drm_encoder.h
index 977a9381c8ba..bafcabb24267 100644
--- a/include/drm/drm_encoder.h
+++ b/include/drm/drm_encoder.h
@@ -320,6 +320,7 @@ static inline struct drm_encoder *drm_encoder_find(struct drm_device *dev,
}
void drm_encoder_cleanup(struct drm_encoder *encoder);
+void drm_encoder_cleanup_from(struct drm_encoder *encoder, struct drm_bridge *bridge);
/**
* drm_for_each_encoder_mask - iterate over encoders specified by bitmask
--
2.34.1
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