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drm/i915/audio: add DOC comment describing HDA over HDMI/DP

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v2: include the section in the drm docbook.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jani Nikula 2014-10-27 16:27:00 +02:00 committed by Daniel Vetter
parent 82910ac6d5
commit 28855d2ac3
2 changed files with 26 additions and 0 deletions
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5
Documentation/DocBook/drm.tmpl
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@ -3854,6 +3854,11 @@ int num_ioctls;</synopsis>
probing, so those sections fully apply.
</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

21
drivers/gpu/drm/i915/intel_audio.c
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@ -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;