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drm/bridge: Add a drm_bridge_state object

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One of the last remaining objects to not have its atomic state.

This is being motivated by our attempt to support runtime bus-format
negotiation between elements of the bridge chain.
This patch just paves the road for such a feature by adding a new
drm_bridge_state object inheriting from drm_private_obj so we can
re-use some of the existing state initialization/tracking logic.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed by: Jernej Skrabec <jernej.skrabec@siol.net>
Tested-by: Jonas Karlman <jonas@kwiboo.se>
Link: https://patchwork.freedesktop.org/patch/msgid/20200106143409.32321-2-narmstrong@baylibre.com
This commit is contained in:
Boris Brezillon 2020-01-06 15:34:06 +01:00 committed by Neil Armstrong
parent 02da7c3d79
commit 6ed7e9625f
5 changed files with 309 additions and 6 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

39
drivers/gpu/drm/drm_atomic.c
View file

@ -30,6 +30,7 @@
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_uapi.h>
#include <drm/drm_bridge.h>
#include <drm/drm_debugfs.h>
#include <drm/drm_device.h>
#include <drm/drm_drv.h>
@ -1017,6 +1018,44 @@ static void drm_atomic_connector_print_state(struct drm_printer *p,
connector->funcs->atomic_print_state(p, state);
}
/**
* drm_atomic_add_encoder_bridges - add bridges attached to an encoder
* @state: atomic state
* @encoder: DRM encoder
*
* This function adds all bridges attached to @encoder. This is needed to add
* bridge states to @state and make them available when
* &bridge_funcs.atomic_{check,pre_enable,enable,disable_post_disable}() are
* called
*
* Returns:
* 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
* then the w/w mutex code has detected a deadlock and the entire atomic
* sequence must be restarted. All other errors are fatal.
*/
int
drm_atomic_add_encoder_bridges(struct drm_atomic_state *state,
struct drm_encoder *encoder)
{
struct drm_bridge_state *bridge_state;
struct drm_bridge *bridge;
if (!encoder)
return 0;
DRM_DEBUG_ATOMIC("Adding all bridges for [encoder:%d:%s] to %p\n",
encoder->base.id, encoder->name, state);
drm_for_each_bridge_in_chain(encoder, bridge) {
bridge_state = drm_atomic_get_bridge_state(state, bridge);
if (IS_ERR(bridge_state))
return PTR_ERR(bridge_state);
}
return 0;
}
EXPORT_SYMBOL(drm_atomic_add_encoder_bridges);
/**
* drm_atomic_add_affected_connectors - add connectors for CRTC
* @state: atomic state

20
drivers/gpu/drm/drm_atomic_helper.c
View file

@ -730,6 +730,26 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
return ret;
}
/*
* Iterate over all connectors again, and add all affected bridges to
* the state.
*/
for_each_oldnew_connector_in_state(state, connector,
old_connector_state,
new_connector_state, i) {
struct drm_encoder *encoder;
encoder = old_connector_state->best_encoder;
ret = drm_atomic_add_encoder_bridges(state, encoder);
if (ret)
return ret;
encoder = new_connector_state->best_encoder;
ret = drm_atomic_add_encoder_bridges(state, encoder);
if (ret)
return ret;
}
ret = mode_valid(state);
if (ret)
return ret;

139
drivers/gpu/drm/drm_bridge.c
View file

@ -25,6 +25,7 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_encoder.h>
@ -89,6 +90,74 @@ void drm_bridge_remove(struct drm_bridge *bridge)
}
EXPORT_SYMBOL(drm_bridge_remove);
static struct drm_bridge_state *
drm_atomic_default_bridge_duplicate_state(struct drm_bridge *bridge)
{
struct drm_bridge_state *new;
if (WARN_ON(!bridge->base.state))
return NULL;
new = kzalloc(sizeof(*new), GFP_KERNEL);
if (new)
__drm_atomic_helper_bridge_duplicate_state(bridge, new);
return new;
}
static struct drm_private_state *
drm_bridge_atomic_duplicate_priv_state(struct drm_private_obj *obj)
{
struct drm_bridge *bridge = drm_priv_to_bridge(obj);
struct drm_bridge_state *state;
if (bridge->funcs->atomic_duplicate_state)
state = bridge->funcs->atomic_duplicate_state(bridge);
else
state = drm_atomic_default_bridge_duplicate_state(bridge);
return state ? &state->base : NULL;
}
static void
drm_atomic_default_bridge_destroy_state(struct drm_bridge *bridge,
struct drm_bridge_state *state)
{
/* Just a simple kfree() for now */
kfree(state);
}
static void
drm_bridge_atomic_destroy_priv_state(struct drm_private_obj *obj,
struct drm_private_state *s)
{
struct drm_bridge_state *state = drm_priv_to_bridge_state(s);
struct drm_bridge *bridge = drm_priv_to_bridge(obj);
if (bridge->funcs->atomic_destroy_state)
bridge->funcs->atomic_destroy_state(bridge, state);
else
drm_atomic_default_bridge_destroy_state(bridge, state);
}
static const struct drm_private_state_funcs drm_bridge_priv_state_funcs = {
.atomic_duplicate_state = drm_bridge_atomic_duplicate_priv_state,
.atomic_destroy_state = drm_bridge_atomic_destroy_priv_state,
};
static struct drm_bridge_state *
drm_atomic_default_bridge_reset(struct drm_bridge *bridge)
{
struct drm_bridge_state *bridge_state;
bridge_state = kzalloc(sizeof(*bridge_state), GFP_KERNEL);
if (!bridge_state)
return ERR_PTR(-ENOMEM);
__drm_atomic_helper_bridge_reset(bridge, bridge_state);
return bridge_state;
}
/**
* drm_bridge_attach - attach the bridge to an encoder's chain
*
@ -114,6 +183,7 @@ EXPORT_SYMBOL(drm_bridge_remove);
int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
struct drm_bridge *previous)
{
struct drm_bridge_state *state;
int ret;
if (!encoder || !bridge)
@ -135,15 +205,35 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
if (bridge->funcs->attach) {
ret = bridge->funcs->attach(bridge);
if (ret < 0) {
list_del(&bridge->chain_node);
bridge->dev = NULL;
bridge->encoder = NULL;
return ret;
}
if (ret < 0)
goto err_reset_bridge;
}
if (bridge->funcs->atomic_reset)
state = bridge->funcs->atomic_reset(bridge);
else
state = drm_atomic_default_bridge_reset(bridge);
if (IS_ERR(state)) {
ret = PTR_ERR(state);
goto err_detach_bridge;
}
drm_atomic_private_obj_init(bridge->dev, &bridge->base,
&state->base,
&drm_bridge_priv_state_funcs);
return 0;
err_detach_bridge:
if (bridge->funcs->detach)
bridge->funcs->detach(bridge);
err_reset_bridge:
bridge->dev = NULL;
bridge->encoder = NULL;
list_del(&bridge->chain_node);
return ret;
}
EXPORT_SYMBOL(drm_bridge_attach);
@ -155,6 +245,8 @@ void drm_bridge_detach(struct drm_bridge *bridge)
if (WARN_ON(!bridge->dev))
return;
drm_atomic_private_obj_fini(&bridge->base);
if (bridge->funcs->detach)
bridge->funcs->detach(bridge);
@ -516,6 +608,41 @@ void drm_atomic_bridge_chain_enable(struct drm_bridge *bridge,
}
EXPORT_SYMBOL(drm_atomic_bridge_chain_enable);
/**
* __drm_atomic_helper_bridge_reset() - Initialize a bridge state to its
* default
* @bridge: the bridge this state is refers to
* @state: bridge state to initialize
*
* Initialize the bridge state to default values. This is meant to be* called
* by the bridge &drm_plane_funcs.reset hook for bridges that subclass the
* bridge state.
*/
void __drm_atomic_helper_bridge_reset(struct drm_bridge *bridge,
struct drm_bridge_state *state)
{
memset(state, 0, sizeof(*state));
state->bridge = bridge;
}
EXPORT_SYMBOL(__drm_atomic_helper_bridge_reset);
/**
* __drm_atomic_helper_bridge_duplicate_state() - Copy atomic bridge state
* @bridge: bridge object
* @state: atomic bridge state
*
* Copies atomic state from a bridge's current state and resets inferred values.
* This is useful for drivers that subclass the bridge state.
*/
void __drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge,
struct drm_bridge_state *state)
{
__drm_atomic_helper_private_obj_duplicate_state(&bridge->base,
&state->base);
state->bridge = bridge;
}
EXPORT_SYMBOL(__drm_atomic_helper_bridge_duplicate_state);
#ifdef CONFIG_OF
/**
* of_drm_find_bridge - find the bridge corresponding to the device node in

3
include/drm/drm_atomic.h
View file

@ -669,6 +669,9 @@ __drm_atomic_get_current_plane_state(struct drm_atomic_state *state,
return plane->state;
}
int __must_check
drm_atomic_add_encoder_bridges(struct drm_atomic_state *state,
struct drm_encoder *encoder);
int __must_check
drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
struct drm_crtc *crtc);

114
include/drm/drm_bridge.h
View file

@ -25,6 +25,8 @@
#include <linux/list.h>
#include <linux/ctype.h>
#include <drm/drm_atomic.h>
#include <drm/drm_encoder.h>
#include <drm/drm_mode_object.h>
#include <drm/drm_modes.h>
@ -33,6 +35,23 @@ struct drm_bridge;
struct drm_bridge_timings;
struct drm_panel;
/**
* struct drm_bridge_state - Atomic bridge state object
* @base: inherit from &drm_private_state
* @bridge: the bridge this state refers to
*/
struct drm_bridge_state {
struct drm_private_state base;
struct drm_bridge *bridge;
};
static inline struct drm_bridge_state *
drm_priv_to_bridge_state(struct drm_private_state *priv)
{
return container_of(priv, struct drm_bridge_state, base);
}
/**
* struct drm_bridge_funcs - drm_bridge control functions
*/
@ -338,6 +357,49 @@ struct drm_bridge_funcs {
*/
void (*atomic_post_disable)(struct drm_bridge *bridge,
struct drm_atomic_state *old_state);
/**
* @atomic_duplicate_state:
*
* Duplicate the current bridge state object (which is guaranteed to be
* non-NULL).
*
* The atomic_duplicate_state() is optional. When not implemented the
* core allocates a drm_bridge_state object and calls
* &__drm_atomic_helper_bridge_duplicate_state() to initialize it.
*
* RETURNS:
* A valid drm_bridge_state object or NULL if the allocation fails.
*/
struct drm_bridge_state *(*atomic_duplicate_state)(struct drm_bridge *bridge);
/**
* @atomic_destroy_state:
*
* Destroy a bridge state object previously allocated by
* &drm_bridge_funcs.atomic_duplicate_state().
*
* The atomic_destroy_state hook is optional. When not implemented the
* core calls kfree() on the state.
*/
void (*atomic_destroy_state)(struct drm_bridge *bridge,
struct drm_bridge_state *state);
/**
* @atomic_reset:
*
* Reset the bridge to a predefined state (or retrieve its current
* state) and return a &drm_bridge_state object matching this state.
* This function is called at attach time.
*
* The atomic_reset hook is optional. When not implemented the core
* allocates a new state and calls &__drm_atomic_helper_bridge_reset().
*
* RETURNS:
* A valid drm_bridge_state object in case of success, an ERR_PTR()
* giving the reason of the failure otherwise.
*/
struct drm_bridge_state *(*atomic_reset)(struct drm_bridge *bridge);
};
/**
@ -380,6 +442,8 @@ struct drm_bridge_timings {
* struct drm_bridge - central DRM bridge control structure
*/
struct drm_bridge {
/** @base: inherit from &drm_private_object */
struct drm_private_obj base;
/** @dev: DRM device this bridge belongs to */
struct drm_device *dev;
/** @encoder: encoder to which this bridge is connected */
@ -404,6 +468,12 @@ struct drm_bridge {
void *driver_private;
};
static inline struct drm_bridge *
drm_priv_to_bridge(struct drm_private_obj *priv)
{
return container_of(priv, struct drm_bridge, base);
}
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);
@ -491,6 +561,50 @@ void drm_atomic_bridge_chain_pre_enable(struct drm_bridge *bridge,
void drm_atomic_bridge_chain_enable(struct drm_bridge *bridge,
struct drm_atomic_state *state);
void __drm_atomic_helper_bridge_reset(struct drm_bridge *bridge,
struct drm_bridge_state *state);
void __drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge,
struct drm_bridge_state *new);
static inline struct drm_bridge_state *
drm_atomic_get_bridge_state(struct drm_atomic_state *state,
struct drm_bridge *bridge)
{
struct drm_private_state *obj_state;
obj_state = drm_atomic_get_private_obj_state(state, &bridge->base);
if (IS_ERR(obj_state))
return ERR_CAST(obj_state);
return drm_priv_to_bridge_state(obj_state);
}
static inline struct drm_bridge_state *
drm_atomic_get_old_bridge_state(struct drm_atomic_state *state,
struct drm_bridge *bridge)
{
struct drm_private_state *obj_state;
obj_state = drm_atomic_get_old_private_obj_state(state, &bridge->base);
if (!obj_state)
return NULL;
return drm_priv_to_bridge_state(obj_state);
}
static inline struct drm_bridge_state *
drm_atomic_get_new_bridge_state(struct drm_atomic_state *state,
struct drm_bridge *bridge)
{
struct drm_private_state *obj_state;
obj_state = drm_atomic_get_new_private_obj_state(state, &bridge->base);
if (!obj_state)
return NULL;
return drm_priv_to_bridge_state(obj_state);
}
#ifdef CONFIG_DRM_PANEL_BRIDGE
struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel);
struct drm_bridge *drm_panel_bridge_add_typed(struct drm_panel *panel,