drm/i915/audio: Track audio state per-transcoder

The audio logic lives in the transcoder rather than the pipe,
so start tracking it like that.

This is only really important for bigjoiner cases where tracking
by pipe doesn't work at all since intel_audio_codec_{enable,disable}()
won't even be called for the slave pipe. This means the state
checker won't find the ELD for the slave pipe and gets upset.
The PD->has_audio readout does currently work since that gets
read out from the same transcoder for both pipes.

For other cases this doesn't actually matter since it's only
the normal pipe transcoders that are audio capable, whereas
the more special transcoders (EDP/DSI) are not.

v2: Fix kernel docs
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230222151454.24888-1-ville.syrjala@linux.intel.comReviewed-by: Uma Shankar <uma.shankar@intel.com>
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/8222

drivers/gpu/drm/i915/display/intel_display_core.h

@@ -103,7 +103,7 @@ struct intel_audio {
 	u32 freq_cntrl;
 
 	/* current audio state for the audio component hooks */
-	struct intel_audio_state state[I915_MAX_PIPES];
+	struct intel_audio_state state[I915_MAX_TRANSCODERS];
 
 	/* necessary resource sharing with HDMI LPE audio driver. */
 	struct {

drivers/gpu/drm/i915/display/intel_lpe_audio.c

@@ -315,7 +315,7 @@ void intel_lpe_audio_teardown(struct drm_i915_private *dev_priv)
  * intel_lpe_audio_notify() - notify lpe audio event
  * audio driver and i915
  * @dev_priv: the i915 drm device private data
- * @pipe: pipe
+ * @cpu_transcoder: CPU transcoder
  * @port: port
  * @eld : ELD data
  * @ls_clock: Link symbol clock in kHz
@@ -324,7 +324,7 @@ void intel_lpe_audio_teardown(struct drm_i915_private *dev_priv)
  * Notify lpe audio driver of eld change.
  */
 void intel_lpe_audio_notify(struct drm_i915_private *dev_priv,
-			    enum pipe pipe, enum port port,
+			    enum transcoder cpu_transcoder, enum port port,
 			    const void *eld, int ls_clock, bool dp_output)
 {
 	unsigned long irqflags;
@@ -344,7 +344,7 @@ void intel_lpe_audio_notify(struct drm_i915_private *dev_priv,
 
 	if (eld != NULL) {
 		memcpy(ppdata->eld, eld, HDMI_MAX_ELD_BYTES);
-		ppdata->pipe = pipe;
+		ppdata->pipe = cpu_transcoder;
 		ppdata->ls_clock = ls_clock;
 		ppdata->dp_output = dp_output;
 

drivers/gpu/drm/i915/display/intel_lpe_audio.h

@@ -8,15 +8,15 @@
 
 #include <linux/types.h>
 
-enum pipe;
 enum port;
+enum transcoder;
 struct drm_i915_private;
 
 int  intel_lpe_audio_init(struct drm_i915_private *dev_priv);
 void intel_lpe_audio_teardown(struct drm_i915_private *dev_priv);
 void intel_lpe_audio_irq_handler(struct drm_i915_private *dev_priv);
 void intel_lpe_audio_notify(struct drm_i915_private *dev_priv,
-			    enum pipe pipe, enum port port,
+			    enum transcoder cpu_transcoder, enum port port,
 			    const void *eld, int ls_clock, bool dp_output);
 
 #endif /* __INTEL_LPE_AUDIO_H__ */