Commit 7b9a9e35 authored by Vinod Polimera's avatar Vinod Polimera Committed by Dmitry Baryshkov
Browse files

drm: add helper functions to retrieve old and new crtc 



Add new helper functions, drm_atomic_get_old_crtc_for_encoder
and drm_atomic_get_new_crtc_for_encoder to retrieve the
corresponding crtc for the encoder.

Signed-off-by: default avatarSankeerth Billakanti <quic_sbillaka@quicinc.com>
Signed-off-by: default avatarVinod Polimera <quic_vpolimer@quicinc.com>
Reviewed-by: default avatarDouglas Anderson <dianders@chromium.org>
Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Patchwork: https://patchwork.freedesktop.org/patch/524718/
Link: https://lore.kernel.org/r/1677774797-31063-2-git-send-email-quic_vpolimer@quicinc.com


Signed-off-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
parent dbd7a2a9

drivers/gpu/drm/drm_atomic.c

+60 −0
Original line number Diff line number Diff line
@@ -984,6 +984,66 @@ drm_atomic_get_new_connector_for_encoder(const struct drm_atomic_state *state, 
}

EXPORT_SYMBOL(drm_atomic_get_new_connector_for_encoder);



/**

 * drm_atomic_get_old_crtc_for_encoder - Get old crtc for an encoder

 * @state: Atomic state

 * @encoder: The encoder to fetch the crtc state for

 *

 * This function finds and returns the crtc that was connected to @encoder

 * as specified by the @state.

 *

 * Returns: The old crtc connected to @encoder, or NULL if the encoder is

 * not connected.

 */

struct drm_crtc *

drm_atomic_get_old_crtc_for_encoder(struct drm_atomic_state *state,

				    struct drm_encoder *encoder)

{

	struct drm_connector *connector;

	struct drm_connector_state *conn_state;



	connector = drm_atomic_get_old_connector_for_encoder(state, encoder);

	if (!connector)

		return NULL;



	conn_state = drm_atomic_get_old_connector_state(state, connector);

	if (!conn_state)

		return NULL;



	return conn_state->crtc;

}

EXPORT_SYMBOL(drm_atomic_get_old_crtc_for_encoder);



/**

 * drm_atomic_get_new_crtc_for_encoder - Get new crtc for an encoder

 * @state: Atomic state

 * @encoder: The encoder to fetch the crtc state for

 *

 * This function finds and returns the crtc that will be connected to @encoder

 * as specified by the @state.

 *

 * Returns: The new crtc connected to @encoder, or NULL if the encoder is

 * not connected.

 */

struct drm_crtc *

drm_atomic_get_new_crtc_for_encoder(struct drm_atomic_state *state,

				    struct drm_encoder *encoder)

{

	struct drm_connector *connector;

	struct drm_connector_state *conn_state;



	connector = drm_atomic_get_new_connector_for_encoder(state, encoder);

	if (!connector)

		return NULL;



	conn_state = drm_atomic_get_new_connector_state(state, connector);

	if (!conn_state)

		return NULL;



	return conn_state->crtc;

}

EXPORT_SYMBOL(drm_atomic_get_new_crtc_for_encoder);



/**

 * drm_atomic_get_connector_state - get connector state

 * @state: global atomic state object

include/drm/drm_atomic.h

+7 −0
Original line number Diff line number Diff line
@@ -528,6 +528,13 @@ struct drm_connector * 
drm_atomic_get_new_connector_for_encoder(const struct drm_atomic_state *state,

					 struct drm_encoder *encoder);



struct drm_crtc *

drm_atomic_get_old_crtc_for_encoder(struct drm_atomic_state *state,

					 struct drm_encoder *encoder);

struct drm_crtc *

drm_atomic_get_new_crtc_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