drm/atomic-helper: Introduce drm_atomic_helper_reset_crtc()

drm_atomic_helper_reset_crtc() allows to reset the CRTC active outputs.

This resets all active components available between the CRTC and
connectors.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20250210132620.42263-3-herve.codina@bootlin.com
Signed-off-by: Maxime Ripard <mripard@kernel.org>

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 26bf2465cee7807d640881ddcb8edc2f972e79d1..d6a206fc9dddd58f995e2af06293861b43687b73 100644 (file)
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -3400,6 +3400,47 @@ free:
 }
 EXPORT_SYMBOL(drm_atomic_helper_disable_all);
 
+/**
+ * drm_atomic_helper_reset_crtc - 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_crtc(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_crtc);
+
 /**
  * drm_atomic_helper_shutdown - shutdown all CRTC
  * @dev: DRM device

diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
index 9aa0a05aa072f14aeb57b4dd8e6674c14190b59a..53382fe93537bbcda9cee8827bc95de9a515efb5 100644 (file)
--- 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_crtc(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,