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ASoC: hdac_hdmi: Apply constraints based on ELD 

Uses the drm ELD core framework to apply rate and channel

Also compute the format to be set based on ELD.

Even though the channel constraint is based on ELD, infoframe
is set with stereo only. Multichannel support will be added
later.

Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
hifive-unleashed-5.1
Subhransu S. Prusty 2016-02-12 07:46:02 +05:30 committed by Mark Brown
parent b8a54545b0
commit 2428bca305
2 changed files with 49 additions and 3 deletions
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1
sound/soc/codecs/Kconfig
View File

@ -490,6 +490,7 @@ config SND_SOC_GTM601
config SND_SOC_HDAC_HDMI
tristate
select SND_HDA_EXT_CORE
select SND_PCM_ELD
select HDMI
config SND_SOC_ICS43432

51
sound/soc/codecs/hdac_hdmi.c
View File

@ -22,10 +22,12 @@
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/hdmi.h>
#include <drm/drm_edid.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/hdaudio_ext.h>
#include <sound/hda_i915.h>
#include <sound/pcm_drm_eld.h>
#include "../../hda/local.h"
#define AMP_OUT_MUTE 0xb080
@ -90,6 +92,45 @@ static inline struct hdac_ext_device *to_hda_ext_device(struct device *dev)
return to_ehdac_device(hdac);
}
static unsigned int sad_format(const u8 *sad)
{
return ((sad[0] >> 0x3) & 0x1f);
}
static unsigned int sad_sample_bits_lpcm(const u8 *sad)
{
return (sad[2] & 7);
}
static int hdac_hdmi_eld_limit_formats(struct snd_pcm_runtime *runtime,
void *eld)
{
u64 formats = SNDRV_PCM_FMTBIT_S16;
int i;
const u8 *sad, *eld_buf = eld;
sad = drm_eld_sad(eld_buf);
if (!sad)
goto format_constraint;
for (i = drm_eld_sad_count(eld_buf); i > 0; i--, sad += 3) {
if (sad_format(sad) == 1) { /* AUDIO_CODING_TYPE_LPCM */
/*
* the controller support 20 and 24 bits in 32 bit
* container so we set S32
*/
if (sad_sample_bits_lpcm(sad) & 0x6)
formats |= SNDRV_PCM_FMTBIT_S32;
}
}
format_constraint:
return snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT,
formats);
}
/* HDMI ELD routines */
static unsigned int hdac_hdmi_get_eld_data(struct hdac_device *codec,
hda_nid_t nid, int byte_index)
@ -334,6 +375,7 @@ static int hdac_hdmi_pcm_open(struct snd_pcm_substream *substream,
struct hdac_ext_device *hdac = snd_soc_dai_get_drvdata(dai);
struct hdac_hdmi_priv *hdmi = hdac->private_data;
struct hdac_hdmi_dai_pin_map *dai_map;
int ret;
if (dai->id > 0) {
dev_err(&hdac->hdac.dev, "Only one dai supported as of now\n");
@ -358,10 +400,13 @@ static int hdac_hdmi_pcm_open(struct snd_pcm_substream *substream,
snd_hdac_codec_write(&hdac->hdac, dai_map->pin->nid, 0,
AC_VERB_SET_AMP_GAIN_MUTE, AMP_OUT_UNMUTE);
snd_pcm_hw_constraint_step(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_CHANNELS, 2);
ret = hdac_hdmi_eld_limit_formats(substream->runtime,
dai_map->pin->eld.eld_buffer);
if (ret < 0)
return ret;
return 0;
return snd_pcm_hw_constraint_eld(substream->runtime,
dai_map->pin->eld.eld_buffer);
}
static void hdac_hdmi_pcm_close(struct snd_pcm_substream *substream,