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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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5
include/drm/drm_connector.h
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@ -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.