Re: [PATCH v2 27/33] drm/atomic-helper: Add an analog TV atomic_check implementation

["Noralf Trønnes" <noralf@tronnes.org>]

Den 22.09.2022 16.25, skrev Maxime Ripard:
> 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.

The constraints part doesn't apply anymore after removing the display
mode check. It's only about detecting changes now.

Noralf.

> 
> Let's create an atomic_check helper for those use cases.
> 
> Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
> Signed-off-by: Maxime Ripard <maxime@cerno.tech>
> 
> diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
> index 0373c3dc824b..e88c57a4f7be 100644
> --- a/drivers/gpu/drm/drm_atomic_state_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_state_helper.c
> @@ -556,6 +556,55 @@ 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;
> +
> +	if ((old_conn_state->tv.margins.left != new_conn_state->tv.margins.left) ||
> +	    (old_conn_state->tv.margins.right != new_conn_state->tv.margins.right) ||
> +	    (old_conn_state->tv.margins.top != new_conn_state->tv.margins.top) ||
> +	    (old_conn_state->tv.margins.bottom != new_conn_state->tv.margins.bottom) ||
> +	    (old_conn_state->tv.mode != new_conn_state->tv.mode) ||
> +	    (old_conn_state->tv.brightness != new_conn_state->tv.brightness) ||
> +	    (old_conn_state->tv.contrast != new_conn_state->tv.contrast) ||
> +	    (old_conn_state->tv.flicker_reduction != new_conn_state->tv.flicker_reduction) ||
> +	    (old_conn_state->tv.overscan != new_conn_state->tv.overscan) ||
> +	    (old_conn_state->tv.saturation != new_conn_state->tv.saturation) ||
> +	    (old_conn_state->tv.hue != new_conn_state->tv.hue))
> +		crtc_state->connectors_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,
>