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drm: add helper functions to retrieve old and new crtc

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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: Sankeerth Billakanti <quic_sbillaka@quicinc.com>
Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Daniel 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: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
This commit is contained in:
Vinod Polimera 2023-03-02 22:03:04 +05:30 committed by Dmitry Baryshkov
parent dbd7a2a941
commit 7b9a9e35e4
2 changed files with 67 additions and 0 deletions
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60
drivers/gpu/drm/drm_atomic.c
View File

@ -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

7
include/drm/drm_atomic.h
View File

@ -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