441 строка
16 KiB
C
441 строка
16 KiB
C
/*
|
|
* 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_BRIDGE_H__
|
|
#define __DRM_BRIDGE_H__
|
|
|
|
#include <linux/list.h>
|
|
#include <linux/ctype.h>
|
|
#include <drm/drm_mode_object.h>
|
|
#include <drm/drm_modes.h>
|
|
|
|
struct drm_bridge;
|
|
struct drm_bridge_timings;
|
|
struct drm_panel;
|
|
|
|
/**
|
|
* struct drm_bridge_funcs - drm_bridge control functions
|
|
*/
|
|
struct drm_bridge_funcs {
|
|
/**
|
|
* @attach:
|
|
*
|
|
* This callback is invoked whenever our bridge is being attached to a
|
|
* &drm_encoder.
|
|
*
|
|
* The attach callback is optional.
|
|
*
|
|
* RETURNS:
|
|
*
|
|
* Zero on success, error code on failure.
|
|
*/
|
|
int (*attach)(struct drm_bridge *bridge);
|
|
|
|
/**
|
|
* @detach:
|
|
*
|
|
* This callback is invoked whenever our bridge is being detached from a
|
|
* &drm_encoder.
|
|
*
|
|
* The detach callback is optional.
|
|
*/
|
|
void (*detach)(struct drm_bridge *bridge);
|
|
|
|
/**
|
|
* @mode_valid:
|
|
*
|
|
* This callback is used to check if a specific mode is valid in this
|
|
* bridge. This should be implemented if the bridge has some sort of
|
|
* restriction in the modes it can display. For example, a given bridge
|
|
* may be responsible to set a clock value. If the clock can not
|
|
* produce all the values for the available modes then this callback
|
|
* can be used to restrict the number of modes to only the ones that
|
|
* can be displayed.
|
|
*
|
|
* This hook is used by the probe helpers to filter the mode list in
|
|
* drm_helper_probe_single_connector_modes(), and it is used by the
|
|
* atomic helpers to validate modes supplied by userspace in
|
|
* drm_atomic_helper_check_modeset().
|
|
*
|
|
* This function is optional.
|
|
*
|
|
* NOTE:
|
|
*
|
|
* Since this function is both called from the check phase of an atomic
|
|
* commit, and the mode validation in the probe paths it is not allowed
|
|
* to look at anything else but the passed-in mode, and validate it
|
|
* against configuration-invariant hardward constraints. Any further
|
|
* limits which depend upon the configuration can only be checked in
|
|
* @mode_fixup.
|
|
*
|
|
* RETURNS:
|
|
*
|
|
* drm_mode_status Enum
|
|
*/
|
|
enum drm_mode_status (*mode_valid)(struct drm_bridge *bridge,
|
|
const struct drm_display_mode *mode);
|
|
|
|
/**
|
|
* @mode_fixup:
|
|
*
|
|
* This callback is used to validate and adjust a mode. The parameter
|
|
* mode is the display mode that should be fed to the next element in
|
|
* the display chain, either the final &drm_connector or the next
|
|
* &drm_bridge. The parameter adjusted_mode is the input mode the bridge
|
|
* requires. It can be modified by this callback and does not need to
|
|
* match mode. See also &drm_crtc_state.adjusted_mode for more details.
|
|
*
|
|
* This is the only hook that allows a bridge to reject a modeset. If
|
|
* this function passes all other callbacks must succeed for this
|
|
* configuration.
|
|
*
|
|
* The mode_fixup callback is optional.
|
|
*
|
|
* NOTE:
|
|
*
|
|
* This function is called in the check phase of atomic modesets, which
|
|
* can be aborted for any reason (including on userspace's request to
|
|
* just check whether a configuration would be possible). Drivers MUST
|
|
* NOT touch any persistent state (hardware or software) or data
|
|
* structures except the passed in @state parameter.
|
|
*
|
|
* Also beware that userspace can request its own custom modes, neither
|
|
* core nor helpers filter modes to the list of probe modes reported by
|
|
* the GETCONNECTOR IOCTL and stored in &drm_connector.modes. To ensure
|
|
* that modes are filtered consistently put any bridge constraints and
|
|
* limits checks into @mode_valid.
|
|
*
|
|
* RETURNS:
|
|
*
|
|
* True if an acceptable configuration is possible, false if the modeset
|
|
* operation should be rejected.
|
|
*/
|
|
bool (*mode_fixup)(struct drm_bridge *bridge,
|
|
const struct drm_display_mode *mode,
|
|
struct drm_display_mode *adjusted_mode);
|
|
/**
|
|
* @disable:
|
|
*
|
|
* This callback should disable the bridge. It is called right before
|
|
* the preceding element in the display pipe is disabled. If the
|
|
* preceding element is a bridge this means it's called before that
|
|
* bridge's @disable vfunc. If the preceding element is a &drm_encoder
|
|
* it's called right before the &drm_encoder_helper_funcs.disable,
|
|
* &drm_encoder_helper_funcs.prepare or &drm_encoder_helper_funcs.dpms
|
|
* hook.
|
|
*
|
|
* The bridge can assume that the display pipe (i.e. clocks and timing
|
|
* signals) feeding it is still running when this callback is called.
|
|
*
|
|
* The disable callback is optional.
|
|
*/
|
|
void (*disable)(struct drm_bridge *bridge);
|
|
|
|
/**
|
|
* @post_disable:
|
|
*
|
|
* This callback should disable the bridge. It is called right after the
|
|
* preceding element in the display pipe is disabled. If the preceding
|
|
* element is a bridge this means it's called after that bridge's
|
|
* @post_disable function. If the preceding element is a &drm_encoder
|
|
* it's called right after the encoder's
|
|
* &drm_encoder_helper_funcs.disable, &drm_encoder_helper_funcs.prepare
|
|
* or &drm_encoder_helper_funcs.dpms hook.
|
|
*
|
|
* The bridge must assume that the display pipe (i.e. clocks and timing
|
|
* singals) feeding it is no longer running when this callback is
|
|
* called.
|
|
*
|
|
* The post_disable callback is optional.
|
|
*/
|
|
void (*post_disable)(struct drm_bridge *bridge);
|
|
|
|
/**
|
|
* @mode_set:
|
|
*
|
|
* This callback should set the given mode on the bridge. It is called
|
|
* after the @mode_set callback for the preceding element in the display
|
|
* pipeline has been called already. If the bridge is the first element
|
|
* then this would be &drm_encoder_helper_funcs.mode_set. The display
|
|
* pipe (i.e. clocks and timing signals) is off when this function is
|
|
* called.
|
|
*
|
|
* The adjusted_mode parameter is the mode output by the CRTC for the
|
|
* first bridge in the chain. It can be different from the mode
|
|
* parameter that contains the desired mode for the connector at the end
|
|
* of the bridges chain, for instance when the first bridge in the chain
|
|
* performs scaling. The adjusted mode is mostly useful for the first
|
|
* bridge in the chain and is likely irrelevant for the other bridges.
|
|
*
|
|
* For atomic drivers the adjusted_mode is the mode stored in
|
|
* &drm_crtc_state.adjusted_mode.
|
|
*
|
|
* NOTE:
|
|
*
|
|
* If a need arises to store and access modes adjusted for other
|
|
* locations than the connection between the CRTC and the first bridge,
|
|
* the DRM framework will have to be extended with DRM bridge states.
|
|
*/
|
|
void (*mode_set)(struct drm_bridge *bridge,
|
|
const struct drm_display_mode *mode,
|
|
const struct drm_display_mode *adjusted_mode);
|
|
/**
|
|
* @pre_enable:
|
|
*
|
|
* This callback should enable the bridge. It is called right before
|
|
* the preceding element in the display pipe is enabled. If the
|
|
* preceding element is a bridge this means it's called before that
|
|
* bridge's @pre_enable function. If the preceding element is a
|
|
* &drm_encoder it's called right before the encoder's
|
|
* &drm_encoder_helper_funcs.enable, &drm_encoder_helper_funcs.commit or
|
|
* &drm_encoder_helper_funcs.dpms hook.
|
|
*
|
|
* The display pipe (i.e. clocks and timing signals) feeding this bridge
|
|
* will not yet be running when this callback is called. The bridge must
|
|
* not enable the display link feeding the next bridge in the chain (if
|
|
* there is one) when this callback is called.
|
|
*
|
|
* The pre_enable callback is optional.
|
|
*/
|
|
void (*pre_enable)(struct drm_bridge *bridge);
|
|
|
|
/**
|
|
* @enable:
|
|
*
|
|
* This callback should enable the bridge. It is called right after
|
|
* the preceding element in the display pipe is enabled. If the
|
|
* preceding element is a bridge this means it's called after that
|
|
* bridge's @enable function. If the preceding element is a
|
|
* &drm_encoder it's called right after the encoder's
|
|
* &drm_encoder_helper_funcs.enable, &drm_encoder_helper_funcs.commit or
|
|
* &drm_encoder_helper_funcs.dpms hook.
|
|
*
|
|
* The bridge can assume that the display pipe (i.e. clocks and timing
|
|
* signals) feeding it is running when this callback is called. This
|
|
* callback must enable the display link feeding the next bridge in the
|
|
* chain if there is one.
|
|
*
|
|
* The enable callback is optional.
|
|
*/
|
|
void (*enable)(struct drm_bridge *bridge);
|
|
|
|
/**
|
|
* @atomic_pre_enable:
|
|
*
|
|
* This callback should enable the bridge. It is called right before
|
|
* the preceding element in the display pipe is enabled. If the
|
|
* preceding element is a bridge this means it's called before that
|
|
* bridge's @atomic_pre_enable or @pre_enable function. If the preceding
|
|
* element is a &drm_encoder it's called right before the encoder's
|
|
* &drm_encoder_helper_funcs.atomic_enable hook.
|
|
*
|
|
* The display pipe (i.e. clocks and timing signals) feeding this bridge
|
|
* will not yet be running when this callback is called. The bridge must
|
|
* not enable the display link feeding the next bridge in the chain (if
|
|
* there is one) when this callback is called.
|
|
*
|
|
* Note that this function will only be invoked in the context of an
|
|
* atomic commit. It will not be invoked from &drm_bridge_pre_enable. It
|
|
* would be prudent to also provide an implementation of @pre_enable if
|
|
* you are expecting driver calls into &drm_bridge_pre_enable.
|
|
*
|
|
* The @atomic_pre_enable callback is optional.
|
|
*/
|
|
void (*atomic_pre_enable)(struct drm_bridge *bridge,
|
|
struct drm_atomic_state *state);
|
|
|
|
/**
|
|
* @atomic_enable:
|
|
*
|
|
* This callback should enable the bridge. It is called right after
|
|
* the preceding element in the display pipe is enabled. If the
|
|
* preceding element is a bridge this means it's called after that
|
|
* bridge's @atomic_enable or @enable function. If the preceding element
|
|
* is a &drm_encoder it's called right after the encoder's
|
|
* &drm_encoder_helper_funcs.atomic_enable hook.
|
|
*
|
|
* The bridge can assume that the display pipe (i.e. clocks and timing
|
|
* signals) feeding it is running when this callback is called. This
|
|
* callback must enable the display link feeding the next bridge in the
|
|
* chain if there is one.
|
|
*
|
|
* Note that this function will only be invoked in the context of an
|
|
* atomic commit. It will not be invoked from &drm_bridge_enable. It
|
|
* would be prudent to also provide an implementation of @enable if
|
|
* you are expecting driver calls into &drm_bridge_enable.
|
|
*
|
|
* The enable callback is optional.
|
|
*/
|
|
void (*atomic_enable)(struct drm_bridge *bridge,
|
|
struct drm_atomic_state *state);
|
|
/**
|
|
* @atomic_disable:
|
|
*
|
|
* This callback should disable the bridge. It is called right before
|
|
* the preceding element in the display pipe is disabled. If the
|
|
* preceding element is a bridge this means it's called before that
|
|
* bridge's @atomic_disable or @disable vfunc. If the preceding element
|
|
* is a &drm_encoder it's called right before the
|
|
* &drm_encoder_helper_funcs.atomic_disable hook.
|
|
*
|
|
* The bridge can assume that the display pipe (i.e. clocks and timing
|
|
* signals) feeding it is still running when this callback is called.
|
|
*
|
|
* Note that this function will only be invoked in the context of an
|
|
* atomic commit. It will not be invoked from &drm_bridge_disable. It
|
|
* would be prudent to also provide an implementation of @disable if
|
|
* you are expecting driver calls into &drm_bridge_disable.
|
|
*
|
|
* The disable callback is optional.
|
|
*/
|
|
void (*atomic_disable)(struct drm_bridge *bridge,
|
|
struct drm_atomic_state *state);
|
|
|
|
/**
|
|
* @atomic_post_disable:
|
|
*
|
|
* This callback should disable the bridge. It is called right after the
|
|
* preceding element in the display pipe is disabled. If the preceding
|
|
* element is a bridge this means it's called after that bridge's
|
|
* @atomic_post_disable or @post_disable function. If the preceding
|
|
* element is a &drm_encoder it's called right after the encoder's
|
|
* &drm_encoder_helper_funcs.atomic_disable hook.
|
|
*
|
|
* The bridge must assume that the display pipe (i.e. clocks and timing
|
|
* signals) feeding it is no longer running when this callback is
|
|
* called.
|
|
*
|
|
* Note that this function will only be invoked in the context of an
|
|
* atomic commit. It will not be invoked from &drm_bridge_post_disable.
|
|
* It would be prudent to also provide an implementation of
|
|
* @post_disable if you are expecting driver calls into
|
|
* &drm_bridge_post_disable.
|
|
*
|
|
* The post_disable callback is optional.
|
|
*/
|
|
void (*atomic_post_disable)(struct drm_bridge *bridge,
|
|
struct drm_atomic_state *state);
|
|
};
|
|
|
|
/**
|
|
* struct drm_bridge_timings - timing information for the bridge
|
|
*/
|
|
struct drm_bridge_timings {
|
|
/**
|
|
* @input_bus_flags:
|
|
*
|
|
* Tells what additional settings for the pixel data on the bus
|
|
* this bridge requires (like pixel signal polarity). See also
|
|
* &drm_display_info->bus_flags.
|
|
*/
|
|
u32 input_bus_flags;
|
|
/**
|
|
* @setup_time_ps:
|
|
*
|
|
* Defines the time in picoseconds the input data lines must be
|
|
* stable before the clock edge.
|
|
*/
|
|
u32 setup_time_ps;
|
|
/**
|
|
* @hold_time_ps:
|
|
*
|
|
* Defines the time in picoseconds taken for the bridge to sample the
|
|
* input signal after the clock edge.
|
|
*/
|
|
u32 hold_time_ps;
|
|
/**
|
|
* @dual_link:
|
|
*
|
|
* True if the bus operates in dual-link mode. The exact meaning is
|
|
* dependent on the bus type. For LVDS buses, this indicates that even-
|
|
* and odd-numbered pixels are received on separate links.
|
|
*/
|
|
bool dual_link;
|
|
};
|
|
|
|
/**
|
|
* struct drm_bridge - central DRM bridge control structure
|
|
*/
|
|
struct drm_bridge {
|
|
/** @dev: DRM device this bridge belongs to */
|
|
struct drm_device *dev;
|
|
/** @encoder: encoder to which this bridge is connected */
|
|
struct drm_encoder *encoder;
|
|
/** @next: the next bridge in the encoder chain */
|
|
struct drm_bridge *next;
|
|
#ifdef CONFIG_OF
|
|
/** @of_node: device node pointer to the bridge */
|
|
struct device_node *of_node;
|
|
#endif
|
|
/** @list: to keep track of all added bridges */
|
|
struct list_head list;
|
|
/**
|
|
* @timings:
|
|
*
|
|
* the timing specification for the bridge, if any (may be NULL)
|
|
*/
|
|
const struct drm_bridge_timings *timings;
|
|
/** @funcs: control functions */
|
|
const struct drm_bridge_funcs *funcs;
|
|
/** @driver_private: pointer to the bridge driver's internal context */
|
|
void *driver_private;
|
|
};
|
|
|
|
void drm_bridge_add(struct drm_bridge *bridge);
|
|
void drm_bridge_remove(struct drm_bridge *bridge);
|
|
struct drm_bridge *of_drm_find_bridge(struct device_node *np);
|
|
int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
|
|
struct drm_bridge *previous);
|
|
|
|
bool drm_bridge_mode_fixup(struct drm_bridge *bridge,
|
|
const struct drm_display_mode *mode,
|
|
struct drm_display_mode *adjusted_mode);
|
|
enum drm_mode_status drm_bridge_mode_valid(struct drm_bridge *bridge,
|
|
const struct drm_display_mode *mode);
|
|
void drm_bridge_disable(struct drm_bridge *bridge);
|
|
void drm_bridge_post_disable(struct drm_bridge *bridge);
|
|
void drm_bridge_mode_set(struct drm_bridge *bridge,
|
|
const struct drm_display_mode *mode,
|
|
const struct drm_display_mode *adjusted_mode);
|
|
void drm_bridge_pre_enable(struct drm_bridge *bridge);
|
|
void drm_bridge_enable(struct drm_bridge *bridge);
|
|
|
|
void drm_atomic_bridge_disable(struct drm_bridge *bridge,
|
|
struct drm_atomic_state *state);
|
|
void drm_atomic_bridge_post_disable(struct drm_bridge *bridge,
|
|
struct drm_atomic_state *state);
|
|
void drm_atomic_bridge_pre_enable(struct drm_bridge *bridge,
|
|
struct drm_atomic_state *state);
|
|
void drm_atomic_bridge_enable(struct drm_bridge *bridge,
|
|
struct drm_atomic_state *state);
|
|
|
|
#ifdef CONFIG_DRM_PANEL_BRIDGE
|
|
struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel,
|
|
u32 connector_type);
|
|
void drm_panel_bridge_remove(struct drm_bridge *bridge);
|
|
struct drm_bridge *devm_drm_panel_bridge_add(struct device *dev,
|
|
struct drm_panel *panel,
|
|
u32 connector_type);
|
|
#endif
|
|
|
|
#endif
|