250 lines
8.0 KiB
C
250 lines
8.0 KiB
C
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/*
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* Copyright (c) 2016 Intel Corporation
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#ifndef __DRM_ENCODER_H__
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#define __DRM_ENCODER_H__
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#include <linux/list.h>
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#include <linux/ctype.h>
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#include <drm/drm_mode_object.h>
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/**
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* struct drm_encoder_funcs - encoder controls
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*
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* Encoders sit between CRTCs and connectors.
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*/
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struct drm_encoder_funcs {
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/**
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* @reset:
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*
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* Reset encoder hardware and software state to off. This function isn't
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* called by the core directly, only through drm_mode_config_reset().
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* It's not a helper hook only for historical reasons.
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*/
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void (*reset)(struct drm_encoder *encoder);
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/**
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* @destroy:
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*
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* Clean up encoder resources. This is only called at driver unload time
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* through drm_mode_config_cleanup() since an encoder cannot be
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* hotplugged in DRM.
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*/
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void (*destroy)(struct drm_encoder *encoder);
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/**
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* @late_register:
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*
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* This optional hook can be used to register additional userspace
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* interfaces attached to the encoder like debugfs interfaces.
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* It is called late in the driver load sequence from drm_dev_register().
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* Everything added from this callback should be unregistered in
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* the early_unregister callback.
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*
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* Returns:
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*
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* 0 on success, or a negative error code on failure.
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*/
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int (*late_register)(struct drm_encoder *encoder);
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/**
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* @early_unregister:
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*
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* This optional hook should be used to unregister the additional
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* userspace interfaces attached to the encoder from
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* late_unregister(). It is called from drm_dev_unregister(),
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* early in the driver unload sequence to disable userspace access
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* before data structures are torndown.
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*/
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void (*early_unregister)(struct drm_encoder *encoder);
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};
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/**
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* struct drm_encoder - central DRM encoder structure
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* @dev: parent DRM device
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* @head: list management
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* @base: base KMS object
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* @name: human readable name, can be overwritten by the driver
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* @crtc: currently bound CRTC
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* @bridge: bridge associated to the encoder
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* @funcs: control functions
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* @helper_private: mid-layer private data
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*
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* CRTCs drive pixels to encoders, which convert them into signals
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* appropriate for a given connector or set of connectors.
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*/
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struct drm_encoder {
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struct drm_device *dev;
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struct list_head head;
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struct drm_mode_object base;
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char *name;
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/**
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* @encoder_type:
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*
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* One of the DRM_MODE_ENCODER_<foo> types in drm_mode.h. The following
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* encoder types are defined thus far:
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*
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* - DRM_MODE_ENCODER_DAC for VGA and analog on DVI-I/DVI-A.
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*
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* - DRM_MODE_ENCODER_TMDS for DVI, HDMI and (embedded) DisplayPort.
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*
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* - DRM_MODE_ENCODER_LVDS for display panels, or in general any panel
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* with a proprietary parallel connector.
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*
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* - DRM_MODE_ENCODER_TVDAC for TV output (Composite, S-Video,
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* Component, SCART).
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*
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* - DRM_MODE_ENCODER_VIRTUAL for virtual machine displays
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*
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* - DRM_MODE_ENCODER_DSI for panels connected using the DSI serial bus.
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*
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* - DRM_MODE_ENCODER_DPI for panels connected using the DPI parallel
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* bus.
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*
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* - DRM_MODE_ENCODER_DPMST for special fake encoders used to allow
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* mutliple DP MST streams to share one physical encoder.
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*/
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int encoder_type;
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/**
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* @index: Position inside the mode_config.list, can be used as an array
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* index. It is invariant over the lifetime of the encoder.
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*/
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unsigned index;
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/**
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* @possible_crtcs: Bitmask of potential CRTC bindings, using
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* drm_crtc_index() as the index into the bitfield. The driver must set
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* the bits for all &drm_crtc objects this encoder can be connected to
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* before calling drm_encoder_init().
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*
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* In reality almost every driver gets this wrong.
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*
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* Note that since CRTC objects can't be hotplugged the assigned indices
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* are stable and hence known before registering all objects.
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*/
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uint32_t possible_crtcs;
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/**
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* @possible_clones: Bitmask of potential sibling encoders for cloning,
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* using drm_encoder_index() as the index into the bitfield. The driver
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* must set the bits for all &drm_encoder objects which can clone a
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* &drm_crtc together with this encoder before calling
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* drm_encoder_init(). Drivers should set the bit representing the
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* encoder itself, too. Cloning bits should be set such that when two
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* encoders can be used in a cloned configuration, they both should have
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* each another bits set.
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*
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* In reality almost every driver gets this wrong.
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*
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* Note that since encoder objects can't be hotplugged the assigned indices
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* are stable and hence known before registering all objects.
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*/
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uint32_t possible_clones;
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struct drm_crtc *crtc;
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struct drm_bridge *bridge;
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const struct drm_encoder_funcs *funcs;
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const struct drm_encoder_helper_funcs *helper_private;
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};
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#define obj_to_encoder(x) container_of(x, struct drm_encoder, base)
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__printf(5, 6)
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int drm_encoder_init(struct drm_device *dev,
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struct drm_encoder *encoder,
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const struct drm_encoder_funcs *funcs,
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int encoder_type, const char *name, ...);
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/**
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* drm_encoder_index - find the index of a registered encoder
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* @encoder: encoder to find index for
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*
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* Given a registered encoder, return the index of that encoder within a DRM
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* device's list of encoders.
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*/
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static inline unsigned int drm_encoder_index(struct drm_encoder *encoder)
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{
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return encoder->index;
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}
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/* FIXME: We have an include file mess still, drm_crtc.h needs untangling. */
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static inline uint32_t drm_crtc_mask(struct drm_crtc *crtc);
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/**
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* drm_encoder_crtc_ok - can a given crtc drive a given encoder?
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* @encoder: encoder to test
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* @crtc: crtc to test
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*
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* Returns false if @encoder can't be driven by @crtc, true otherwise.
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*/
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static inline bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
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struct drm_crtc *crtc)
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{
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return !!(encoder->possible_crtcs & drm_crtc_mask(crtc));
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}
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/**
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* drm_encoder_find - find a &drm_encoder
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* @dev: DRM device
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* @id: encoder id
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*
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* Returns the encoder with @id, NULL if it doesn't exist. Simple wrapper around
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* drm_mode_object_find().
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*/
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static inline struct drm_encoder *drm_encoder_find(struct drm_device *dev,
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uint32_t id)
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{
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struct drm_mode_object *mo;
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mo = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_ENCODER);
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return mo ? obj_to_encoder(mo) : NULL;
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}
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void drm_encoder_cleanup(struct drm_encoder *encoder);
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/**
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* drm_for_each_encoder_mask - iterate over encoders specified by bitmask
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* @encoder: the loop cursor
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* @dev: the DRM device
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* @encoder_mask: bitmask of encoder indices
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*
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* Iterate over all encoders specified by bitmask.
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*/
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#define drm_for_each_encoder_mask(encoder, dev, encoder_mask) \
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list_for_each_entry((encoder), &(dev)->mode_config.encoder_list, head) \
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for_each_if ((encoder_mask) & (1 << drm_encoder_index(encoder)))
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/**
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* drm_for_each_encoder - iterate over all encoders
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* @encoder: the loop cursor
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* @dev: the DRM device
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*
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* Iterate over all encoders of @dev.
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*/
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#define drm_for_each_encoder(encoder, dev) \
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list_for_each_entry(encoder, &(dev)->mode_config.encoder_list, head)
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#endif
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