From: Sam Ravnborg <sam@ravnborg.org>
To: dri-devel@lists.freedesktop.org
Cc: Chun-Kuang Hu <chunkuang.hu@kernel.org>,
Dafna Hirschfeld <dafna.hirschfeld@collabora.com>,
Thomas Zimmermann <tzimmermann@suse.de>,
Jonas Karlman <jonas@kwiboo.se>, David Airlie <airlied@linux.ie>,
Robert Foss <robert.foss@linaro.org>,
Neil Armstrong <narmstrong@baylibre.com>,
Jernej Skrabec <jernej.skrabec@gmail.com>,
Andrzej Hajda <a.hajda@samsung.com>,
linux-mediatek@lists.infradead.org,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
Sam Ravnborg <sam@ravnborg.org>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v1 7/7] drm/todo: Add bridge related todo items
Date: Thu, 22 Jul 2021 08:22:46 +0200 [thread overview]
Message-ID: <20210722062246.2512666-8-sam@ravnborg.org> (raw)
In-Reply-To: <20210722062246.2512666-1-sam@ravnborg.org>
- deprecated callbacks in drm_bridge_funcs
- move connector creation to display drivers
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
---
Documentation/gpu/todo.rst | 47 ++++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst
index 12e61869939e..0ed1f49df73e 100644
--- a/Documentation/gpu/todo.rst
+++ b/Documentation/gpu/todo.rst
@@ -477,6 +477,53 @@ Contact: Thomas Zimmermann <tzimmermann@suse.de>, Christian König, Daniel Vette
Level: Intermediate
+Drop use of deprecated callbacks in bridge drivers
+--------------------------------------------------
+
+&struct drm_bridge_funcs contains a number of deprecated operations
+which use can be replaced by the atomic variants.
+
+* pre_enable => atomic_pre_enable
+* enable => atomic_enable
+* disable => atomic_disable
+* post_disable => atomic_post_disable
+
+The above are in most cases a simple adjustment of the arguments and names.
+
+* mode_set is no longer required and the implementation shall be merged
+ with atomic_enable.
+
+* mode_fixup => atomic_check
+ mode_fixup() was created a long time ago, when we were supposed to have
+ a single bridge at the output of the CRTC. The bridge could then instruct
+ the CRTC to output a different mode than what the display requires.
+ Now that we have support for multiple bridges, it's not as straightforward,
+ and we've so far just pretended to ignore the problem. The .mode_fixup()
+ operation is used and abused, and just telling people to use .atomic_check()
+ will likely make things worse as that operation has access to the full atomic
+ commit and can alter the mode of pretty much anything. We need to define clear
+ semantics for .atomic_check() in bridges.
+
+
+Contact: Sam Ravnborg <sam@ravnborg.org>, Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+
+Level: Beginner or intermediate (depending on the driver)
+
+Move connector creation to display drivers
+------------------------------------------
+
+With the introduction of chained bridges the creation of connectors are moved to the
+display drivers. The flag DRM_BRIDGE_ATTACH_NO_CONNECTOR is used to signal to the bridge
+driver that no connector shall be created and that the display driver will take care.
+Display drivers will in most cases be able to utilise drm_bridge_connector_init() for all
+the logic.
+
+This task requires all bridge drivers to support optional or no connector creation and all
+display drivers using bridges to support creating the connector.
+
+Contact: Sam Ravnborg <sam@ravnborg.org>, bridge maintainers, driver maintainer
+
+Level: Intermediate or advanced (depending on the driver)
Core refactorings
=================
--
2.30.2
next prev parent reply other threads:[~2021-07-22 6:23 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-22 6:22 [PATCH v1 0/7] drm/bridge: Drop deprecated functions Sam Ravnborg
2021-07-22 6:22 ` [PATCH v1 1/7] drm/bridge: ps8640: Use atomic variants of drm_bridge_funcs Sam Ravnborg
2021-07-22 7:18 ` Maxime Ripard
2021-07-22 6:22 ` [PATCH v1 2/7] drm/bridge: Drop unused drm_bridge_chain functions Sam Ravnborg
2021-07-22 7:19 ` Maxime Ripard
2021-07-22 6:22 ` [PATCH v1 3/7] drm/bridge: Add drm_bridge_new_crtc_state() helper Sam Ravnborg
2021-07-22 7:30 ` Maxime Ripard
2021-07-22 6:22 ` [PATCH v1 4/7] drm/bridge: lontium-lt9611: Use atomic variants of drm_bridge_funcs Sam Ravnborg
2021-07-22 7:42 ` Maxime Ripard
2021-07-22 6:22 ` [PATCH v1 5/7] drm/mediatek: Drop chain_mode_fixup call in mode_valid() Sam Ravnborg
2021-07-22 7:31 ` Maxime Ripard
2021-07-22 6:22 ` [PATCH v1 6/7] drm/bridge: Drop drm_bridge_chain_mode_fixup Sam Ravnborg
2021-07-22 7:32 ` Maxime Ripard
2021-07-22 6:22 ` Sam Ravnborg [this message]
2021-07-22 7:34 ` [PATCH v1 7/7] drm/todo: Add bridge related todo items Maxime Ripard
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