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drm: Add drm_atomic_get_(old|new)_connector_for_encoder() helpers

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Add functions to the atomic core to retrieve the old and new connectors
associated with an encoder in a drm_atomic_state. This is useful for
encoders and bridges that need to access the connector, for instance for
the drm_display_info.

The CRTC associated with the encoder can also be retrieved through the
connector state, and from it, the old and new CRTC states.

Changed in v4:
- Added to the set
Changed in v5:
- Fix up docbook (Daniel & Laurent)
Changed in v6:
- Updated commit subject (Sam)

Link to v4: https://patchwork.freedesktop.org/patch/msgid/20190508160920.144739-3-sean@poorly.run
Link to v5: https://patchwork.freedesktop.org/patch/msgid/20190611160844.257498-3-sean@poorly.run

Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Sam Ravnborg <sam@ravnborg.org>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

[seanpaul removed WARNs from helpers and added docs to explain why
returning NULL might be valid]
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190611205147.181298-1-sean@poorly.run
This commit is contained in:
Laurent Pinchart 2019-06-11 16:51:43 -04:00 committed by Sean Paul
parent 43c76d72ea
commit 1b27fbdde1
3 changed files with 81 additions and 0 deletions
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69
drivers/gpu/drm/drm_atomic.c
View File

@ -846,6 +846,75 @@ drm_atomic_get_new_private_obj_state(struct drm_atomic_state *state,
}
EXPORT_SYMBOL(drm_atomic_get_new_private_obj_state);
/**
* drm_atomic_get_old_connector_for_encoder - Get old connector for an encoder
* @state: Atomic state
* @encoder: The encoder to fetch the connector state for
*
* This function finds and returns the connector that was connected to @encoder
* as specified by the @state.
*
* If there is no connector in @state which previously had @encoder connected to
* it, this function will return NULL. While this may seem like an invalid use
* case, it is sometimes useful to differentiate commits which had no prior
* connectors attached to @encoder vs ones that did (and to inspect their
* state). This is especially true in enable hooks because the pipeline has
* changed.
*
* Returns: The old connector connected to @encoder, or NULL if the encoder is
* not connected.
*/
struct drm_connector *
drm_atomic_get_old_connector_for_encoder(struct drm_atomic_state *state,
struct drm_encoder *encoder)
{
struct drm_connector_state *conn_state;
struct drm_connector *connector;
unsigned int i;
for_each_old_connector_in_state(state, connector, conn_state, i) {
if (conn_state->best_encoder == encoder)
return connector;
}
return NULL;
}
EXPORT_SYMBOL(drm_atomic_get_old_connector_for_encoder);
/**
* drm_atomic_get_new_connector_for_encoder - Get new connector for an encoder
* @state: Atomic state
* @encoder: The encoder to fetch the connector state for
*
* This function finds and returns the connector that will be connected to
* @encoder as specified by the @state.
*
* If there is no connector in @state which will have @encoder connected to it,
* this function will return NULL. While this may seem like an invalid use case,
* it is sometimes useful to differentiate commits which have no connectors
* attached to @encoder vs ones that do (and to inspect their state). This is
* especially true in disable hooks because the pipeline will change.
*
* Returns: The new connector connected to @encoder, or NULL if the encoder is
* not connected.
*/
struct drm_connector *
drm_atomic_get_new_connector_for_encoder(struct drm_atomic_state *state,
struct drm_encoder *encoder)
{
struct drm_connector_state *conn_state;
struct drm_connector *connector;
unsigned int i;
for_each_new_connector_in_state(state, connector, conn_state, i) {
if (conn_state->best_encoder == encoder)
return connector;
}
return NULL;
}
EXPORT_SYMBOL(drm_atomic_get_new_connector_for_encoder);
/**
* drm_atomic_get_connector_state - get connector state
* @state: global atomic state object

7
include/drm/drm_atomic.h
View File

@ -459,6 +459,13 @@ struct drm_private_state *
drm_atomic_get_new_private_obj_state(struct drm_atomic_state *state,
struct drm_private_obj *obj);
struct drm_connector *
drm_atomic_get_old_connector_for_encoder(struct drm_atomic_state *state,
struct drm_encoder *encoder);
struct drm_connector *
drm_atomic_get_new_connector_for_encoder(struct drm_atomic_state *state,
struct drm_encoder *encoder);
/**
* drm_atomic_get_existing_crtc_state - get crtc state, if it exists
* @state: global atomic state object

5
include/drm/drm_connector.h
View File

@ -518,6 +518,11 @@ struct drm_connector_state {
* &drm_connector_helper_funcs.atomic_best_encoder or
* &drm_connector_helper_funcs.best_encoder callbacks.
*
* This is also used in the atomic helpers to map encoders to their
* current and previous connectors, see
* &drm_atomic_get_old_connector_for_encoder() and
* &drm_atomic_get_new_connector_for_encoder().
*
* NOTE: Atomic drivers must fill this out (either themselves or through
* helpers), for otherwise the GETCONNECTOR and GETENCODER IOCTLs will
* not return correct data to userspace.