drm/i915: Add plumbing for digital connector state, v3.

Some atomic properties are common between the various kinds of
connectors, for example a lot of them use panel fitting mode.
It makes sense to put a lot of it in a common place, so each
connector can use it while they're being converted.

Implement the properties required for the connectors:
- scaling mode property
- force audio property
- broadcast rgb
- aspect ratio

While at it, make clear that intel_digital_connector_atomic_get_property
is a hack that has to be removed when all connector properties
are converted to atomic.

Changes since v1:
- Scaling mode and aspect ratio are partly handled in core now.
Changes since v2:
- Split out the scaling mode / aspect ratio changes to a preparation
  patch.
- Use mode_changed for panel fitter, changes to this property
  are checked by fastset.
- Allowed_scaling_modes is removed, handled through core now.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170501133804.8116-6-maarten.lankhorst@linux.intel.com

1 files changed, 12 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 7fa21df..8a11558 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5974,11 +5974,21 @@ static void intel_connector_verify_state(struct drm_crtc_state *crtc_state,
 
 int intel_connector_init(struct intel_connector *connector)
 {
-	drm_atomic_helper_connector_reset(&connector->base);
+	struct intel_digital_connector_state *conn_state;
 
-	if (!connector->base.state)
+	/*
+	 * Allocate enough memory to hold intel_digital_connector_state,
+	 * This might be a few bytes too many, but for connectors that don't
+	 * need it we'll free the state and allocate a smaller one on the first
+	 * succesful commit anyway.
+	 */
+	conn_state = kzalloc(sizeof(*conn_state), GFP_KERNEL);
+	if (!conn_state)
 		return -ENOMEM;
 
+	__drm_atomic_helper_connector_reset(&connector->base,
+					    &conn_state->base);
+
 	return 0;
 }