linux-kernel - [PATCH v9 02/15] drm: add helper functions to retrieve old and new crtc

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Date:   Wed, 14 Dec 2022 15:35:39 +0530
From:   Vinod Polimera <quic_vpolimer@...cinc.com>
To:     <dri-devel@...ts.freedesktop.org>, <linux-arm-msm@...r.kernel.org>,
        <freedreno@...ts.freedesktop.org>, <devicetree@...r.kernel.org>
CC:     Vinod Polimera <quic_vpolimer@...cinc.com>,
        <linux-kernel@...r.kernel.org>, <robdclark@...il.com>,
        <dianders@...omium.org>, <swboyd@...omium.org>,
        <quic_kalyant@...cinc.com>, <dmitry.baryshkov@...aro.org>,
        <quic_khsieh@...cinc.com>, <quic_vproddut@...cinc.com>,
        <quic_bjorande@...cinc.com>, <quic_aravindh@...cinc.com>,
        <quic_abhinavk@...cinc.com>, <quic_sbillaka@...cinc.com>
Subject: [PATCH v9 02/15] 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: Sankeerth Billakanti <quic_sbillaka@...cinc.com>
Signed-off-by: Vinod Polimera <quic_vpolimer@...cinc.com>
Reviewed-by: Douglas Anderson <dianders@...omium.org>
---
 drivers/gpu/drm/drm_atomic.c | 60 ++++++++++++++++++++++++++++++++++++++++++++
 include/drm/drm_atomic.h     |  7 ++++++
 2 files changed, 67 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index f197f59..941fd6d 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -985,6 +985,66 @@ drm_atomic_get_new_connector_for_encoder(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
  * @connector: connector to get state object for
diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index 10b1990..fdbd656 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -528,6 +528,13 @@ struct drm_connector *
 drm_atomic_get_new_connector_for_encoder(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
-- 
2.7.4