mirror of https://gitee.com/openkylin/linux.git
261 lines
6.7 KiB
ReStructuredText
261 lines
6.7 KiB
ReStructuredText
=============================
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Mode Setting Helper Functions
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=============================
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The plane, CRTC, encoder and connector functions provided by the drivers
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implement the DRM API. They're called by the DRM core and ioctl handlers
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to handle device state changes and configuration request. As
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implementing those functions often requires logic not specific to
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drivers, mid-layer helper functions are available to avoid duplicating
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boilerplate code.
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The DRM core contains one mid-layer implementation. The mid-layer
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provides implementations of several plane, CRTC, encoder and connector
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functions (called from the top of the mid-layer) that pre-process
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requests and call lower-level functions provided by the driver (at the
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bottom of the mid-layer). For instance, the
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:c:func:`drm_crtc_helper_set_config()` function can be used to
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fill the :c:type:`struct drm_crtc_funcs <drm_crtc_funcs>`
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set_config field. When called, it will split the set_config operation
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in smaller, simpler operations and call the driver to handle them.
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To use the mid-layer, drivers call
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:c:func:`drm_crtc_helper_add()`,
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:c:func:`drm_encoder_helper_add()` and
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:c:func:`drm_connector_helper_add()` functions to install their
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mid-layer bottom operations handlers, and fill the :c:type:`struct
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drm_crtc_funcs <drm_crtc_funcs>`, :c:type:`struct
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drm_encoder_funcs <drm_encoder_funcs>` and :c:type:`struct
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drm_connector_funcs <drm_connector_funcs>` structures with
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pointers to the mid-layer top API functions. Installing the mid-layer
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bottom operation handlers is best done right after registering the
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corresponding KMS object.
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The mid-layer is not split between CRTC, encoder and connector
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operations. To use it, a driver must provide bottom functions for all of
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the three KMS entities.
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Atomic Modeset Helper Functions Reference
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=========================================
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Overview
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--------
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.. kernel-doc:: drivers/gpu/drm/drm_atomic_helper.c
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:doc: overview
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Implementing Asynchronous Atomic Commit
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---------------------------------------
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.. kernel-doc:: drivers/gpu/drm/drm_atomic_helper.c
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:doc: implementing nonblocking commit
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Atomic State Reset and Initialization
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-------------------------------------
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.. kernel-doc:: drivers/gpu/drm/drm_atomic_helper.c
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:doc: atomic state reset and initialization
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.. kernel-doc:: include/drm/drm_atomic_helper.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/drm_atomic_helper.c
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:export:
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Modeset Helper Reference for Common Vtables
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===========================================
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.. kernel-doc:: include/drm/drm_modeset_helper_vtables.h
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:internal:
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.. kernel-doc:: include/drm/drm_modeset_helper_vtables.h
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:doc: overview
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Legacy CRTC/Modeset Helper Functions Reference
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==============================================
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.. kernel-doc:: drivers/gpu/drm/drm_crtc_helper.c
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:export:
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.. kernel-doc:: drivers/gpu/drm/drm_crtc_helper.c
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:doc: overview
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Output Probing Helper Functions Reference
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=========================================
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.. kernel-doc:: drivers/gpu/drm/drm_probe_helper.c
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:doc: output probing helper overview
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.. kernel-doc:: drivers/gpu/drm/drm_probe_helper.c
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:export:
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fbdev Helper Functions Reference
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================================
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.. kernel-doc:: drivers/gpu/drm/drm_fb_helper.c
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:doc: fbdev helpers
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.. kernel-doc:: drivers/gpu/drm/drm_fb_helper.c
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:export:
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.. kernel-doc:: include/drm/drm_fb_helper.h
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:internal:
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Framebuffer CMA Helper Functions Reference
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==========================================
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.. kernel-doc:: drivers/gpu/drm/drm_fb_cma_helper.c
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:doc: framebuffer cma helper functions
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.. kernel-doc:: drivers/gpu/drm/drm_fb_cma_helper.c
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:export:
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Display Port Helper Functions Reference
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=======================================
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.. kernel-doc:: drivers/gpu/drm/drm_dp_helper.c
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:doc: dp helpers
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.. kernel-doc:: include/drm/drm_dp_helper.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/drm_dp_helper.c
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:export:
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Display Port Dual Mode Adaptor Helper Functions Reference
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=========================================================
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.. kernel-doc:: drivers/gpu/drm/drm_dp_dual_mode_helper.c
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:doc: dp dual mode helpers
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.. kernel-doc:: include/drm/drm_dp_dual_mode_helper.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/drm_dp_dual_mode_helper.c
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:export:
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Display Port MST Helper Functions Reference
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===========================================
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.. kernel-doc:: drivers/gpu/drm/drm_dp_mst_topology.c
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:doc: dp mst helper
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.. kernel-doc:: include/drm/drm_dp_mst_helper.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/drm_dp_mst_topology.c
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:export:
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MIPI DSI Helper Functions Reference
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===================================
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.. kernel-doc:: drivers/gpu/drm/drm_mipi_dsi.c
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:doc: dsi helpers
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.. kernel-doc:: include/drm/drm_mipi_dsi.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/drm_mipi_dsi.c
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:export:
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EDID Helper Functions Reference
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===============================
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.. kernel-doc:: drivers/gpu/drm/drm_edid.c
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:export:
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Rectangle Utilities Reference
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=============================
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.. kernel-doc:: include/drm/drm_rect.h
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:doc: rect utils
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.. kernel-doc:: include/drm/drm_rect.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/drm_rect.c
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:export:
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Flip-work Helper Reference
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==========================
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.. kernel-doc:: include/drm/drm_flip_work.h
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:doc: flip utils
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.. kernel-doc:: include/drm/drm_flip_work.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/drm_flip_work.c
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:export:
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HDMI Infoframes Helper Reference
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================================
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Strictly speaking this is not a DRM helper library but generally useable
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by any driver interfacing with HDMI outputs like v4l or alsa drivers.
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But it nicely fits into the overall topic of mode setting helper
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libraries and hence is also included here.
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.. kernel-doc:: include/linux/hdmi.h
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:internal:
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.. kernel-doc:: drivers/video/hdmi.c
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:export:
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Plane Helper Reference
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======================
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.. kernel-doc:: drivers/gpu/drm/drm_plane_helper.c
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:export:
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.. kernel-doc:: drivers/gpu/drm/drm_plane_helper.c
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:doc: overview
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Tile group
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----------
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.. kernel-doc:: drivers/gpu/drm/drm_crtc.c
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:doc: Tile group
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Bridges
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=======
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Overview
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--------
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.. kernel-doc:: drivers/gpu/drm/drm_bridge.c
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:doc: overview
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Default bridge callback sequence
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--------------------------------
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.. kernel-doc:: drivers/gpu/drm/drm_bridge.c
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:doc: bridge callbacks
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.. kernel-doc:: drivers/gpu/drm/drm_bridge.c
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:export:
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Panel Helper Reference
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======================
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.. kernel-doc:: include/drm/drm_panel.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/drm_panel.c
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:export:
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.. kernel-doc:: drivers/gpu/drm/drm_panel.c
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:doc: drm panel
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Simple KMS Helper Reference
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===========================
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.. kernel-doc:: include/drm/drm_simple_kms_helper.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/drm_simple_kms_helper.c
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:export:
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.. kernel-doc:: drivers/gpu/drm/drm_simple_kms_helper.c
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:doc: overview
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