[PATCH v3 2/3] drm/vc4: Move reset_pipe() to an atomic helper

Herve Codina
2025-01-08T10:19:24Z

reset_pipe() allows to reset the CRTC active outputs.

In order to use it from other drivers without code duplication, move it
to an atomic helper without any functional changes.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
---
drivers/gpu/drm/drm_atomic_helper.c | 41 +++++++++++++++++++++++++++++
drivers/gpu/drm/vc4/vc4_hdmi.c | 30 +--------------------
include/drm/drm_atomic_helper.h | 2 ++
3 files changed, 44 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 8ed186ddaeaf..4225b814ea35 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -3363,6 +3363,47 @@ int drm_atomic_helper_disable_all(struct drm_device *dev,
}
EXPORT_SYMBOL(drm_atomic_helper_disable_all);

+/**
+ * drm_atomic_helper_reset_pipe - reset the active outputs of a CRTC
+ * @crtc: DRM CRTC
+ * @ctx: lock acquisition context
+ *
+ * Reset the active outputs by indicating that connectors have changed.
+ * This implies a reset of all active components available between the CRTC and
+ * connectors.
+ *
+ * Returns:
+ * 0 on success or a negative error code on failure.
+ */
+int drm_atomic_helper_reset_pipe(struct drm_crtc *crtc,
+ struct drm_modeset_acquire_ctx *ctx)
+{
+ struct drm_atomic_state *state;
+ struct drm_crtc_state *crtc_state;
+ int ret;
+
+ state = drm_atomic_state_alloc(crtc->dev);
+ if (!state)
+ return -ENOMEM;
+
+ state->acquire_ctx = ctx;
+
+ crtc_state = drm_atomic_get_crtc_state(state, crtc);
+ if (IS_ERR(crtc_state)) {
+ ret = PTR_ERR(crtc_state);
+ goto out;
+ }
+
+ crtc_state->connectors_changed = true;
+
+ ret = drm_atomic_commit(state);
+out:
+ drm_atomic_state_put(state);
+
+ return ret;
+}
+EXPORT_SYMBOL(drm_atomic_helper_reset_pipe);
+
/**
* drm_atomic_helper_shutdown - shutdown all CRTC
* @dev: DRM device
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index e3818c48c9b8..19f6592a8cc5 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -269,34 +269,6 @@ static void vc4_hdmi_cec_update_clk_div(struct vc4_hdmi *vc4_hdmi)
static void vc4_hdmi_cec_update_clk_div(struct vc4_hdmi *vc4_hdmi) {}
#endif

-static int reset_pipe(struct drm_crtc *crtc,
- struct drm_modeset_acquire_ctx *ctx)
-{
- struct drm_atomic_state *state;
- struct drm_crtc_state *crtc_state;
- int ret;
-
- state = drm_atomic_state_alloc(crtc->dev);
- if (!state)
- return -ENOMEM;
-
- state->acquire_ctx = ctx;
-
- crtc_state = drm_atomic_get_crtc_state(state, crtc);
- if (IS_ERR(crtc_state)) {
- ret = PTR_ERR(crtc_state);
- goto out;
- }
-
- crtc_state->connectors_changed = true;
-
- ret = drm_atomic_commit(state);
-out:
- drm_atomic_state_put(state);
-
- return ret;
-}
-
static int vc4_hdmi_reset_link(struct drm_connector *connector,
struct drm_modeset_acquire_ctx *ctx)
{
@@ -375,7 +347,7 @@ static int vc4_hdmi_reset_link(struct drm_connector *connector,
* would be perfectly happy if were to just reconfigure
* the SCDC settings on the fly.
*/
- return reset_pipe(crtc, ctx);
+ return drm_atomic_helper_reset_pipe(crtc, ctx);
}

static void vc4_hdmi_handle_hotplug(struct vc4_hdmi *vc4_hdmi,
diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
index 9aa0a05aa072..56eb6881cfb2 100644
--- a/include/drm/drm_atomic_helper.h
+++ b/include/drm/drm_atomic_helper.h
@@ -139,6 +139,8 @@ int drm_atomic_helper_set_config(struct drm_mode_set *set,

int drm_atomic_helper_disable_all(struct drm_device *dev,
struct drm_modeset_acquire_ctx *ctx);
+int drm_atomic_helper_reset_pipe(struct drm_crtc *crtc,
+ struct drm_modeset_acquire_ctx *ctx);
void drm_atomic_helper_shutdown(struct drm_device *dev);
struct drm_atomic_state *
drm_atomic_helper_duplicate_state(struct drm_device *dev,
--
2.47.1