Current File : //usr/src/kernels/3.10.0-1160.83.1.el7.centos.plus.x86_64/include/drm/drm_encoder.h
/*
* Copyright (c) 2016 Intel Corporation
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#ifndef __DRM_ENCODER_H__
#define __DRM_ENCODER_H__
#include <linux/list.h>
#include <linux/ctype.h>
#include <drm/drm_crtc.h>
#include <drm/drm_mode.h>
#include <drm/drm_mode_object.h>
#include <drm/drm_util.h>
struct drm_encoder;
/**
* struct drm_encoder_funcs - encoder controls
*
* Encoders sit between CRTCs and connectors.
*/
struct drm_encoder_funcs {
/**
* @reset:
*
* Reset encoder hardware and software state to off. This function isn't
* called by the core directly, only through drm_mode_config_reset().
* It's not a helper hook only for historical reasons.
*/
void (*reset)(struct drm_encoder *encoder);
/**
* @destroy:
*
* Clean up encoder resources. This is only called at driver unload time
* through drm_mode_config_cleanup() since an encoder cannot be
* hotplugged in DRM.
*/
void (*destroy)(struct drm_encoder *encoder);
/**
* @late_register:
*
* This optional hook can be used to register additional userspace
* interfaces attached to the encoder like debugfs interfaces.
* It is called late in the driver load sequence from drm_dev_register().
* Everything added from this callback should be unregistered in
* the early_unregister callback.
*
* Returns:
*
* 0 on success, or a negative error code on failure.
*/
int (*late_register)(struct drm_encoder *encoder);
/**
* @early_unregister:
*
* This optional hook should be used to unregister the additional
* userspace interfaces attached to the encoder from
* @late_register. It is called from drm_dev_unregister(),
* early in the driver unload sequence to disable userspace access
* before data structures are torndown.
*/
void (*early_unregister)(struct drm_encoder *encoder);
};
/**
* struct drm_encoder - central DRM encoder structure
* @dev: parent DRM device
* @head: list management
* @base: base KMS object
* @name: human readable name, can be overwritten by the driver
* @bridge: bridge associated to the encoder
* @funcs: control functions
* @helper_private: mid-layer private data
*
* CRTCs drive pixels to encoders, which convert them into signals
* appropriate for a given connector or set of connectors.
*/
struct drm_encoder {
struct drm_device *dev;
struct list_head head;
struct drm_mode_object base;
char *name;
/**
* @encoder_type:
*
* One of the DRM_MODE_ENCODER_<foo> types in drm_mode.h. The following
* encoder types are defined thus far:
*
* - DRM_MODE_ENCODER_DAC for VGA and analog on DVI-I/DVI-A.
*
* - DRM_MODE_ENCODER_TMDS for DVI, HDMI and (embedded) DisplayPort.
*
* - DRM_MODE_ENCODER_LVDS for display panels, or in general any panel
* with a proprietary parallel connector.
*
* - DRM_MODE_ENCODER_TVDAC for TV output (Composite, S-Video,
* Component, SCART).
*
* - DRM_MODE_ENCODER_VIRTUAL for virtual machine displays
*
* - DRM_MODE_ENCODER_DSI for panels connected using the DSI serial bus.
*
* - DRM_MODE_ENCODER_DPI for panels connected using the DPI parallel
* bus.
*
* - DRM_MODE_ENCODER_DPMST for special fake encoders used to allow
* mutliple DP MST streams to share one physical encoder.
*/
int encoder_type;
/**
* @index: Position inside the mode_config.list, can be used as an array
* index. It is invariant over the lifetime of the encoder.
*/
unsigned index;
/**
* @possible_crtcs: Bitmask of potential CRTC bindings, using
* drm_crtc_index() as the index into the bitfield. The driver must set
* the bits for all &drm_crtc objects this encoder can be connected to
* before calling drm_encoder_init().
*
* In reality almost every driver gets this wrong.
*
* Note that since CRTC objects can't be hotplugged the assigned indices
* are stable and hence known before registering all objects.
*/
uint32_t possible_crtcs;
/**
* @possible_clones: Bitmask of potential sibling encoders for cloning,
* using drm_encoder_index() as the index into the bitfield. The driver
* must set the bits for all &drm_encoder objects which can clone a
* &drm_crtc together with this encoder before calling
* drm_encoder_init(). Drivers should set the bit representing the
* encoder itself, too. Cloning bits should be set such that when two
* encoders can be used in a cloned configuration, they both should have
* each another bits set.
*
* In reality almost every driver gets this wrong.
*
* Note that since encoder objects can't be hotplugged the assigned indices
* are stable and hence known before registering all objects.
*/
uint32_t possible_clones;
/**
* @crtc: Currently bound CRTC, only really meaningful for non-atomic
* drivers. Atomic drivers should instead check
* &drm_connector_state.crtc.
*/
struct drm_crtc *crtc;
struct drm_bridge *bridge;
const struct drm_encoder_funcs *funcs;
const struct drm_encoder_helper_funcs *helper_private;
};
#define obj_to_encoder(x) container_of(x, struct drm_encoder, base)
__printf(5, 6)
int drm_encoder_init(struct drm_device *dev,
struct drm_encoder *encoder,
const struct drm_encoder_funcs *funcs,
int encoder_type, const char *name, ...);
/**
* drm_encoder_index - find the index of a registered encoder
* @encoder: encoder to find index for
*
* Given a registered encoder, return the index of that encoder within a DRM
* device's list of encoders.
*/
static inline unsigned int drm_encoder_index(const struct drm_encoder *encoder)
{
return encoder->index;
}
/**
* drm_encoder_mask - find the mask of a registered ENCODER
* @encoder: encoder to find mask for
*
* Given a registered encoder, return the mask bit of that encoder for an
* encoder's possible_clones field.
*/
static inline u32 drm_encoder_mask(const struct drm_encoder *encoder)
{
return 1 << drm_encoder_index(encoder);
}
/**
* drm_encoder_crtc_ok - can a given crtc drive a given encoder?
* @encoder: encoder to test
* @crtc: crtc to test
*
* Returns false if @encoder can't be driven by @crtc, true otherwise.
*/
static inline bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
struct drm_crtc *crtc)
{
return !!(encoder->possible_crtcs & drm_crtc_mask(crtc));
}
/**
* drm_encoder_find - find a &drm_encoder
* @dev: DRM device
* @file_priv: drm file to check for lease against.
* @id: encoder id
*
* Returns the encoder with @id, NULL if it doesn't exist. Simple wrapper around
* drm_mode_object_find().
*/
static inline struct drm_encoder *drm_encoder_find(struct drm_device *dev,
struct drm_file *file_priv,
uint32_t id)
{
struct drm_mode_object *mo;
mo = drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_ENCODER);
return mo ? obj_to_encoder(mo) : NULL;
}
void drm_encoder_cleanup(struct drm_encoder *encoder);
/**
* drm_for_each_encoder_mask - iterate over encoders specified by bitmask
* @encoder: the loop cursor
* @dev: the DRM device
* @encoder_mask: bitmask of encoder indices
*
* Iterate over all encoders specified by bitmask.
*/
#define drm_for_each_encoder_mask(encoder, dev, encoder_mask) \
list_for_each_entry((encoder), &(dev)->mode_config.encoder_list, head) \
for_each_if ((encoder_mask) & drm_encoder_mask(encoder))
/**
* drm_for_each_encoder - iterate over all encoders
* @encoder: the loop cursor
* @dev: the DRM device
*
* Iterate over all encoders of @dev.
*/
#define drm_for_each_encoder(encoder, dev) \
list_for_each_entry(encoder, &(dev)->mode_config.encoder_list, head)
#endif
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