drm/i915: Pick one HDMI port for infoframe/audio transmission on g4x

On g4x the hardware has only one audio/video DIP block. Thus
only one HDMI port can transmit audio/infoframes at a time.
Currently we pretend that multiple ports can do it at the same
time, but that doesn't actually work for two reasons:
- the state of the single hw block will get clobbered by
  the multiple ports, leading to state checker failures
- the hardware will automagically disable audio/infoframe
  transmission when enabled on multiple ports

To fix this let's allow only one of the ports to transmit
audio/infoframes at a time. We'll just go over all the HDMI
ports and pick the first one that is otherwise capable of
audio/infoframes. Further HDMI ports will be treated as if
they had a DVI sink connected.

In order to compute this consistently we'll also need to
always add all HDMI ports to the atomic state.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221107194604.15227-6-ville.syrjala@linux.intel.com
Reviewed-by: Uma Shankar <uma.shankar@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/display/g4x_hdmi.h b/drivers/gpu/drm/i915/display/g4x_hdmi.h
index db9a93bc9321..1e3ea7f3c846 100644
--- a/drivers/gpu/drm/i915/display/g4x_hdmi.h
+++ b/drivers/gpu/drm/i915/display/g4x_hdmi.h
@@ -11,9 +11,13 @@
 #include "i915_reg_defs.h"
 
 enum port;
+struct drm_atomic_state;
+struct drm_connector;
 struct drm_i915_private;
 
 void g4x_hdmi_init(struct drm_i915_private *dev_priv,
 		   i915_reg_t hdmi_reg, enum port port);
+int g4x_hdmi_connector_atomic_check(struct drm_connector *connector,
+				    struct drm_atomic_state *state);
 
 #endif