diff options
| -rw-r--r-- | Documentation/DocBook/drm.tmpl | 5 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_audio.c | 21 |
2 files changed, 26 insertions, 0 deletions
diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl index f6a9d7b21380..01b8ca5f1a3d 100644 --- a/Documentation/DocBook/drm.tmpl +++ b/Documentation/DocBook/drm.tmpl @@ -3855,6 +3855,11 @@ int num_ioctls;</synopsis> </para> </sect2> <sect2> + <title>High Definition Audio</title> +!Pdrivers/gpu/drm/i915/intel_audio.c High Definition Audio over HDMI and Display Port +!Idrivers/gpu/drm/i915/intel_audio.c + </sect2> + <sect2> <title>DPIO</title> !Pdrivers/gpu/drm/i915/i915_reg.h DPIO <table id="dpiox2"> diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c index 9181b85d86c4..44c49dfe1096 100644 --- a/drivers/gpu/drm/i915/intel_audio.c +++ b/drivers/gpu/drm/i915/intel_audio.c @@ -28,6 +28,27 @@ #include "intel_drv.h" #include "i915_drv.h" +/** + * DOC: High Definition Audio over HDMI and Display Port + * + * The graphics and audio drivers together support High Definition Audio over + * HDMI and Display Port. The audio programming sequences are divided into audio + * codec and controller enable and disable sequences. The graphics driver + * handles the audio codec sequences, while the audio driver handles the audio + * controller sequences. + * + * The disable sequences must be performed before disabling the transcoder or + * port. The enable sequences may only be performed after enabling the + * transcoder and port, and after completed link training. + * + * The codec and controller sequences could be done either parallel or serial, + * but generally the ELDV/PD change in the codec sequence indicates to the audio + * driver that the controller sequence should start. Indeed, most of the + * co-operation between the graphics and audio drivers is handled via audio + * related registers. (The notable exception is the power management, not + * covered here.) + */ + static const struct { int clock; u32 config; |