linux.git/drivers/gpu/drm/drm_encoder.c, branch v6.18.21

drm/encoder: register per-encoder debugfs dir

2023-12-04T14:07:29+00:00

Each of connectors and CRTCs used by the DRM device provides debugfs
directory, which is used by several standard debugfs files and can
further be extended by the driver. Add such generic debugfs directories
for encoder.

Reviewed-by: Neil Armstrong 
Acked-by: Maxime Ripard 
Signed-off-by: Dmitry Baryshkov 
Link: https://patchwork.freedesktop.org/patch/msgid/20231203115315.1306124-2-dmitry.baryshkov@linaro.org

drm/encoder: Introduce drmm_encoder_init

2022-07-13T08:46:05+00:00

The DRM-managed function to register an encoder is
drmm_encoder_alloc() and its variants, which will allocate the underlying
structure and initialisation the encoder.

However, we might want to separate the structure creation and the encoder
initialisation, for example if the structure is shared across multiple DRM
entities, for example an encoder and a connector.

Let's create an helper to only initialise an encoder that would be passed
as an argument.

Acked-by: Thomas Zimmermann 
Signed-off-by: Maxime Ripard 
Link: https://lore.kernel.org/r/20220711173939.1132294-4-maxime@cerno.tech

drm: use ENOMEM for drmm_kzalloc allocation failures

2022-05-25T15:39:49+00:00

Other callers of drmm_kzalloc already return -ENOMEM on allocation
failure. Change EINVAL to ENOMEM for consistency.

Signed-off-by: Niels Dossche 
Signed-off-by: Daniel Vetter 
Link: https://patchwork.freedesktop.org/patch/msgid/20220521234104.88410-1-dossche.niels@gmail.com

drm: add drmm_encoder_alloc()

2021-01-04T11:59:33+00:00

Add an alternative to drm_encoder_init() that allocates and initializes
an encoder and registers drm_encoder_cleanup() with
drmm_add_action_or_reset().

Signed-off-by: Philipp Zabel 
Reviewed-by: Laurent Pinchart 
Reviewed-by: Daniel Vetter

drm/encoder: make encoder control functions optional

2021-01-04T11:59:33+00:00

Simple managed encoders do not require the .destroy callback,
make the whole funcs structure optional.

Signed-off-by: Philipp Zabel 
Reviewed-by: Laurent Pinchart 
Reviewed-by: Daniel Vetter

drm/bridge: Make the bridge chain a double-linked list

2019-12-09T09:03:01+00:00

So that each element in the chain can easily access its predecessor.
This will be needed to support bus format negotiation between elements
of the bridge chain.

Signed-off-by: Boris Brezillon 
Reviewed-by: Neil Armstrong 
Reviewed-by: Laurent Pinchart 
Link: https://patchwork.freedesktop.org/patch/msgid/20191203141515.3597631-5-boris.brezillon@collabora.com

drm: Stop accessing encoder->bridge directly

2019-12-09T09:02:45+00:00

We are about to replace the single-linked bridge list by a double-linked
one based on list.h, leading to the suppression of the encoder->bridge
field. But before we can do that we must provide a
drm_bridge_chain_get_first_bridge() bridge helper and patch all drivers
and core helpers to use it instead of directly accessing encoder->bridge.

Note that we still have 2 drivers (VC4 and Exynos) manipulating the
encoder->bridge field directly because they need to cut the bridge chain
in order to control the enable/disable sequence. This is definitely
not something we want to encourage, so let's keep those 2 oddities
around until we find a better solution.

Signed-off-by: Boris Brezillon 
Reviewed-by: Laurent Pinchart 
Reviewed-by: Neil Armstrong 
Link: https://patchwork.freedesktop.org/patch/msgid/20191203141515.3597631-4-boris.brezillon@collabora.com

drm/bridge: Introduce drm_bridge_get_next_bridge()

2019-12-09T09:02:22+00:00

And use it in drivers accessing the bridge->next field directly.
This is part of our attempt to make the bridge chain a double-linked list
based on the generic list helpers.

Signed-off-by: Boris Brezillon 
Reviewed-by: Neil Armstrong 
Reviewed-by: Laurent Pinchart 
Link: https://patchwork.freedesktop.org/patch/msgid/20191203141515.3597631-3-boris.brezillon@collabora.com

drm: Stop including drm_bridge.h from drm_crtc.h

2019-08-28T20:11:03+00:00

We are about to add a drm_bridge_state that inherits from
drm_private_state which is defined in drm_atomic.h. Problem is,
drm_atomic.h includes drm_crtc.h which in turn includes drm_bridge.h,
leading to "drm_private_state has incomplete type" error.

Let's force all users of the drm_bridge API to explicitly include
drm_bridge.h.

Signed-off-by: Boris Brezillon 
Reviewed-by: Sam Ravnborg 
Link: https://patchwork.freedesktop.org/patch/msgid/20190826152649.13820-2-boris.brezillon@collabora.com

drm: drop use of drmP.h in drm/*

2019-05-27T16:07:03+00:00

The use of the drmP.h header file is deprecated.
Remove use from all files in drm/*
so people do not look there and follow a bad example.

Build tested allyesconfig,allmodconfig on x86, arm etc.
Including alpha that is as always more challenging than
the rest.

Signed-off-by: Sam Ravnborg 
Acked-by: Daniel Vetter 
Cc: Maarten Lankhorst 
Cc: Maxime Ripard 
Cc: Sean Paul 
Cc: David Airlie 
Link: https://patchwork.freedesktop.org/patch/msgid/20190526173535.32701-8-sam@ravnborg.org