So that bridge drivers have a way to check/reject an atomic operation.
The drm_atomic_bridge_chain_check() (which is just a wrapper around
the ->atomic_check() hook) is called in place of
drm_bridge_chain_mode_fixup() (when ->atomic_check() is not implemented,
the core falls back to ->mode_fixup(), so the behavior should stay
the same for existing bridge drivers).
Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_atomic_helper.c | 11 +++---
drivers/gpu/drm/drm_bridge.c | 59 +++++++++++++++++++++++++++++
include/drm/drm_bridge.h | 23 +++++++++++
3 files changed, 87 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index e76ec9648b6f..3fadde38ead7 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -445,12 +445,11 @@ mode_fixup(struct drm_atomic_state *state)
encoder = new_conn_state->best_encoder;
funcs = encoder->helper_private;
- ret = drm_bridge_chain_mode_fixup(encoder,
- &new_crtc_state->mode,
- &new_crtc_state->adjusted_mode);
- if (!ret) {
- DRM_DEBUG_ATOMIC("Bridge fixup failed\n");
- return -EINVAL;
+ ret = drm_atomic_bridge_chain_check(encoder, new_crtc_state,
+ new_conn_state);
+ if (ret) {
+ DRM_DEBUG_ATOMIC("Bridge atomic check failed\n");
+ return ret;
}
if (funcs && funcs->atomic_check) {
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 0528ca941855..dcad661daa74 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -583,6 +583,65 @@ void drm_atomic_bridge_chain_enable(struct drm_encoder *encoder,
}
EXPORT_SYMBOL(drm_atomic_bridge_chain_enable);
+static int drm_atomic_bridge_check(struct drm_bridge *bridge,
+ struct drm_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state)
+{
+ if (bridge->funcs->atomic_check) {
+ struct drm_bridge_state *bridge_state;
+ int ret;
+
+ bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
+ bridge);
+ if (WARN_ON(!bridge_state))
+ return -EINVAL;
+
+ ret = bridge->funcs->atomic_check(bridge, bridge_state,
+ crtc_state, conn_state);
+ if (ret)
+ return ret;
+ } else if (bridge->funcs->mode_fixup) {
+ if (!bridge->funcs->mode_fixup(bridge, &crtc_state->mode,
+ &crtc_state->adjusted_mode))
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/**
+ * drm_atomic_bridge_chain_check() - Do an atomic check on the bridge chain
+ * @encoder: encoder object
+ * @crtc_state: new CRTC state
+ * @conn_state: new connector state
+ *
+ * Calls &drm_bridge_funcs.atomic_check() (falls back on
+ * &drm_bridge_funcs.mode_fixup()) op for all the bridges in the encoder chain,
+ * starting from the last bridge to the first. These are called before calling
+ * &drm_encoder_helper_funcs.atomic_check()
+ *
+ * RETURNS:
+ * 0 on success, a negative error code on failure
+ */
+int drm_atomic_bridge_chain_check(struct drm_encoder *encoder,
+ struct drm_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state)
+{
+ struct drm_bridge *bridge;
+
+ list_for_each_entry_reverse(bridge, &encoder->bridge_chain,
+ chain_node) {
+ int ret;
+
+ ret = drm_atomic_bridge_check(bridge, crtc_state, conn_state);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_atomic_bridge_chain_check);
+
/**
* drm_atomic_helper_init_bridge_state() - Initializes a bridge state
* @bridge this state is referring to
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 9383b4e4b853..5d8fe3709bde 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -379,6 +379,26 @@ struct drm_bridge_funcs {
*/
void (*atomic_destroy_state)(struct drm_bridge *bridge,
struct drm_bridge_state *state);
+
+ /**
+ * @atomic_check:
+ *
+ * This method is responsible for checking bridge state correctness.
+ * It can also check the state of the surrounding components in chain
+ * to make sure the whole pipeline can work properly.
+ *
+ * &drm_bridge_funcs.atomic_check() hooks are called in reverse
+ * order (from the last to the first bridge).
+ *
+ * This method is optional.
+ *
+ * RETURNS:
+ * zero if the check passed, a negative error code otherwise.
+ */
+ int (*atomic_check)(struct drm_bridge *bridge,
+ struct drm_bridge_state *bridge_state,
+ struct drm_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state);
};
/**
@@ -479,6 +499,9 @@ void drm_bridge_chain_mode_set(struct drm_encoder *encoder,
void drm_bridge_chain_pre_enable(struct drm_encoder *encoder);
void drm_bridge_chain_enable(struct drm_encoder *encoder);
+int drm_atomic_bridge_chain_check(struct drm_encoder *encoder,
+ struct drm_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state);
void drm_atomic_bridge_chain_disable(struct drm_encoder *encoder,
struct drm_atomic_state *state);
void drm_atomic_bridge_chain_post_disable(struct drm_encoder *encoder,
--
2.21.0
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