[PATCH v2 23/41] drm/atomic-helper: Add an analog TV atomic_check implementation

From: Maxime Ripard
Date: Mon Aug 29 2022 - 09:16:53 EST


The analog TV connector drivers share some atomic_check logic, and the new
TV standard property have created a bunch of new constraints that needs to
be shared across drivers too.

Let's create an atomic_check helper for those use cases.

Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
index 0373c3dc824b..d64733c6aae3 100644
--- a/drivers/gpu/drm/drm_atomic_state_helper.c
+++ b/drivers/gpu/drm/drm_atomic_state_helper.c
@@ -556,6 +556,42 @@ void drm_atomic_helper_connector_tv_reset(struct drm_connector *connector)
}
EXPORT_SYMBOL(drm_atomic_helper_connector_tv_reset);

+/**
+ * @drm_atomic_helper_connector_tv_check: Validate an analog TV connector state
+ * @connector: DRM Connector
+ * @state: the DRM State object
+ *
+ * Checks the state object to see if the requested state is valid for an
+ * analog TV connector.
+ *
+ * Returns:
+ * Zero for success, a negative error code on error.
+ */
+int drm_atomic_helper_connector_tv_check(struct drm_connector *connector,
+ struct drm_atomic_state *state)
+{
+ struct drm_connector_state *old_conn_state =
+ drm_atomic_get_old_connector_state(state, connector);
+ struct drm_connector_state *new_conn_state =
+ drm_atomic_get_new_connector_state(state, connector);
+ struct drm_crtc_state *crtc_state;
+ struct drm_crtc *crtc;
+
+ crtc = new_conn_state->crtc;
+ if (!crtc)
+ return 0;
+
+ crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+ if (!crtc_state)
+ return -EINVAL;
+
+ if (old_conn_state->tv.mode != new_conn_state->tv.mode)
+ crtc_state->mode_changed = true;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_atomic_helper_connector_tv_check);
+
/**
* __drm_atomic_helper_connector_duplicate_state - copy atomic connector state
* @connector: connector object
diff --git a/include/drm/drm_atomic_state_helper.h b/include/drm/drm_atomic_state_helper.h
index c8fbce795ee7..b9740edb2658 100644
--- a/include/drm/drm_atomic_state_helper.h
+++ b/include/drm/drm_atomic_state_helper.h
@@ -26,6 +26,7 @@

#include <linux/types.h>

+struct drm_atomic_state;
struct drm_bridge;
struct drm_bridge_state;
struct drm_crtc;
@@ -71,6 +72,8 @@ void __drm_atomic_helper_connector_reset(struct drm_connector *connector,
struct drm_connector_state *conn_state);
void drm_atomic_helper_connector_reset(struct drm_connector *connector);
void drm_atomic_helper_connector_tv_reset(struct drm_connector *connector);
+int drm_atomic_helper_connector_tv_check(struct drm_connector *connector,
+ struct drm_atomic_state *state);
void drm_atomic_helper_connector_tv_margins_reset(struct drm_connector *connector);
void
__drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector,

--
b4 0.10.0-dev-65ba7