drm/doc: Light drm-kms-helper.rst cleanup
- Move the common vtable stuff to the top - Move "Tile Group" to a more appropriate heading level - Throw away the old intro for the crtc helpers (it's entirely stale, e.g. helpers have become modular years ago), and replace it with a general intro about the motivation behind helpers. - Reorder helpers to group them together a bit better, and explain that grouping in the intro. - Make sure the introductory DOC section is always first. v2: - Remove bogus files accidentally added (Sean). - Spelling fixes (Sean). Cc: Sean Paul <seanpaul@chromium.org> Reviewed-by: Sean Paul <seanpaul@chromium.org> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1471034937-651-2-git-send-email-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter
Родитель
62cacc7939
Коммит
bcb32b691c
|
|
@ -2,38 +2,45 @@
|
|||
Mode Setting Helper Functions
|
||||
=============================
|
||||
|
||||
The plane, CRTC, encoder and connector functions provided by the drivers
|
||||
implement the DRM API. They're called by the DRM core and ioctl handlers
|
||||
to handle device state changes and configuration request. As
|
||||
implementing those functions often requires logic not specific to
|
||||
drivers, mid-layer helper functions are available to avoid duplicating
|
||||
boilerplate code.
|
||||
The DRM subsystem aims for a strong separation between core code and helper
|
||||
libraries. Core code takes care of general setup and teardown and decoding
|
||||
userspace requests to kernel internal objects. Everything else is handled by a
|
||||
large set of helper libraries, which can be combined freely to pick and choose
|
||||
for each driver what fits, and avoid shared code where special behaviour is
|
||||
needed.
|
||||
|
||||
The DRM core contains one mid-layer implementation. The mid-layer
|
||||
provides implementations of several plane, CRTC, encoder and connector
|
||||
functions (called from the top of the mid-layer) that pre-process
|
||||
requests and call lower-level functions provided by the driver (at the
|
||||
bottom of the mid-layer). For instance, the
|
||||
:c:func:`drm_crtc_helper_set_config()` function can be used to
|
||||
fill the :c:type:`struct drm_crtc_funcs <drm_crtc_funcs>`
|
||||
set_config field. When called, it will split the set_config operation
|
||||
in smaller, simpler operations and call the driver to handle them.
|
||||
This distinction between core code and helpers is especially strong in the
|
||||
modesetting code, where there's a shared userspace ABI for all drivers. This is
|
||||
in contrast to the render side, where pretty much everything (with very few
|
||||
exceptions) can be considered optional helper code.
|
||||
|
||||
To use the mid-layer, drivers call
|
||||
:c:func:`drm_crtc_helper_add()`,
|
||||
:c:func:`drm_encoder_helper_add()` and
|
||||
:c:func:`drm_connector_helper_add()` functions to install their
|
||||
mid-layer bottom operations handlers, and fill the :c:type:`struct
|
||||
drm_crtc_funcs <drm_crtc_funcs>`, :c:type:`struct
|
||||
drm_encoder_funcs <drm_encoder_funcs>` and :c:type:`struct
|
||||
drm_connector_funcs <drm_connector_funcs>` structures with
|
||||
pointers to the mid-layer top API functions. Installing the mid-layer
|
||||
bottom operation handlers is best done right after registering the
|
||||
corresponding KMS object.
|
||||
There are a few areas these helpers can grouped into:
|
||||
|
||||
The mid-layer is not split between CRTC, encoder and connector
|
||||
operations. To use it, a driver must provide bottom functions for all of
|
||||
the three KMS entities.
|
||||
* Helpers to implement modesetting. The important ones here are the atomic
|
||||
helpers. Old drivers still often use the legacy CRTC helpers. They both share
|
||||
the same set of common helper vtables. For really simple drivers (anything
|
||||
that would have been a great fit in the deprecated fbdev subsystem) there's
|
||||
also the simple display pipe helpers.
|
||||
|
||||
* There's a big pile of helpers for handling outputs. First the generic bridge
|
||||
helpers for handling encoder and transcoder IP blocks. Second the panel helpers
|
||||
for handling panel-related information and logic. Plus then a big set of
|
||||
helpers for the various sink standards (DisplayPort, HDMI, MIPI DSI). Finally
|
||||
there's also generic helpers for handling output probing, and for dealing with
|
||||
EDIDs.
|
||||
|
||||
* The last group of helpers concerns itself with the frontend side of a display
|
||||
pipeline: Planes, handling rectangles for visibility checking and scissoring,
|
||||
flip queues and assorted bits.
|
||||
|
||||
Modeset Helper Reference for Common Vtables
|
||||
===========================================
|
||||
|
||||
.. kernel-doc:: include/drm/drm_modeset_helper_vtables.h
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: include/drm/drm_modeset_helper_vtables.h
|
||||
:doc: overview
|
||||
|
||||
Atomic Modeset Helper Functions Reference
|
||||
=========================================
|
||||
|
|
@ -62,33 +69,27 @@ Atomic State Reset and Initialization
|
|||
.. kernel-doc:: drivers/gpu/drm/drm_atomic_helper.c
|
||||
:export:
|
||||
|
||||
Modeset Helper Reference for Common Vtables
|
||||
===========================================
|
||||
|
||||
.. kernel-doc:: include/drm/drm_modeset_helper_vtables.h
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: include/drm/drm_modeset_helper_vtables.h
|
||||
:doc: overview
|
||||
|
||||
Legacy CRTC/Modeset Helper Functions Reference
|
||||
==============================================
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_crtc_helper.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_crtc_helper.c
|
||||
:doc: overview
|
||||
|
||||
Output Probing Helper Functions Reference
|
||||
=========================================
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_probe_helper.c
|
||||
:doc: output probing helper overview
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_probe_helper.c
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_crtc_helper.c
|
||||
:export:
|
||||
|
||||
Simple KMS Helper Reference
|
||||
===========================
|
||||
|
||||
.. kernel-doc:: include/drm/drm_simple_kms_helper.h
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_simple_kms_helper.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_simple_kms_helper.c
|
||||
:doc: overview
|
||||
|
||||
fbdev Helper Functions Reference
|
||||
================================
|
||||
|
||||
|
|
@ -110,6 +111,36 @@ Framebuffer CMA Helper Functions Reference
|
|||
.. kernel-doc:: drivers/gpu/drm/drm_fb_cma_helper.c
|
||||
:export:
|
||||
|
||||
Bridges
|
||||
=======
|
||||
|
||||
Overview
|
||||
--------
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_bridge.c
|
||||
:doc: overview
|
||||
|
||||
Default bridge callback sequence
|
||||
--------------------------------
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_bridge.c
|
||||
:doc: bridge callbacks
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_bridge.c
|
||||
:export:
|
||||
|
||||
Panel Helper Reference
|
||||
======================
|
||||
|
||||
.. kernel-doc:: include/drm/drm_panel.h
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_panel.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_panel.c
|
||||
:doc: drm panel
|
||||
|
||||
Display Port Helper Functions Reference
|
||||
=======================================
|
||||
|
||||
|
|
@ -158,6 +189,15 @@ MIPI DSI Helper Functions Reference
|
|||
.. kernel-doc:: drivers/gpu/drm/drm_mipi_dsi.c
|
||||
:export:
|
||||
|
||||
Output Probing Helper Functions Reference
|
||||
=========================================
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_probe_helper.c
|
||||
:doc: output probing helper overview
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_probe_helper.c
|
||||
:export:
|
||||
|
||||
EDID Helper Functions Reference
|
||||
===============================
|
||||
|
||||
|
|
@ -176,18 +216,6 @@ Rectangle Utilities Reference
|
|||
.. kernel-doc:: drivers/gpu/drm/drm_rect.c
|
||||
:export:
|
||||
|
||||
Flip-work Helper Reference
|
||||
==========================
|
||||
|
||||
.. kernel-doc:: include/drm/drm_flip_work.h
|
||||
:doc: flip utils
|
||||
|
||||
.. kernel-doc:: include/drm/drm_flip_work.h
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_flip_work.c
|
||||
:export:
|
||||
|
||||
HDMI Infoframes Helper Reference
|
||||
================================
|
||||
|
||||
|
|
@ -202,59 +230,31 @@ libraries and hence is also included here.
|
|||
.. kernel-doc:: drivers/video/hdmi.c
|
||||
:export:
|
||||
|
||||
Flip-work Helper Reference
|
||||
==========================
|
||||
|
||||
.. kernel-doc:: include/drm/drm_flip_work.h
|
||||
:doc: flip utils
|
||||
|
||||
.. kernel-doc:: include/drm/drm_flip_work.h
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_flip_work.c
|
||||
:export:
|
||||
|
||||
Plane Helper Reference
|
||||
======================
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_plane_helper.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_plane_helper.c
|
||||
:doc: overview
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_plane_helper.c
|
||||
:export:
|
||||
|
||||
Tile group
|
||||
----------
|
||||
==========
|
||||
|
||||
# FIXME: This should probably be moved into a property documentation section
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_crtc.c
|
||||
:doc: Tile group
|
||||
|
||||
Bridges
|
||||
=======
|
||||
|
||||
Overview
|
||||
--------
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_bridge.c
|
||||
:doc: overview
|
||||
|
||||
Default bridge callback sequence
|
||||
--------------------------------
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_bridge.c
|
||||
:doc: bridge callbacks
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_bridge.c
|
||||
:export:
|
||||
|
||||
Panel Helper Reference
|
||||
======================
|
||||
|
||||
.. kernel-doc:: include/drm/drm_panel.h
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_panel.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_panel.c
|
||||
:doc: drm panel
|
||||
|
||||
Simple KMS Helper Reference
|
||||
===========================
|
||||
|
||||
.. kernel-doc:: include/drm/drm_simple_kms_helper.h
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_simple_kms_helper.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_simple_kms_helper.c
|
||||
:doc: overview
|
||||
|
|
|
|||
|
|
@ -33,6 +33,9 @@ Primary Nodes, DRM Master and Authentication
|
|||
.. kernel-doc:: include/drm/drm_auth.h
|
||||
:internal:
|
||||
|
||||
Open-Source Userspace Requirements
|
||||
==================================
|
||||
|
||||
Render nodes
|
||||
============
|
||||
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче