[alsa-devel] [PATCH v3] ALSA: hda - Update chmap tlv to report sink's capability

[Takashi Iwai]

On Mon, 04 Apr 2016 15:53:54 +0200,
Subhransu S. Prusty wrote:
> 
> The existing TLV callback implementation copies all of the
> cea_channel_speaker_allocation map table to the TLV container
> irrespective of what is reported by sink. This is of little use
> to the userspace application.
> 
> With this patch, it parses the spk_alloc block as queried from
> the ELD, and copies only the corresponding mapping channel
> allocation entries from the cea channel speaker allocation table.
> Thus the user can parse the TLV container to identify sink's
> capability and set the channel map accordingly.
> 
> It shouldn't impact the behavior in AMD chipset, as this makes
> use of already parsed spk alloc block to calculate the channel
> map.
> 
> Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty at intel.com>
> Signed-off-by: Vinod Koul <vinod.koul at intel.com>
> ---
> changes in v3:
> 	Copy all possible channel map entries w.r.t. sink's capability

Applied, thanks.


Takashi

> 
>  include/sound/hda_chmap.h  |  2 ++
>  sound/hda/hdmi_chmap.c     | 44 ++++++++++++++++++++++++++++++++++++++++----
>  sound/pci/hda/patch_hdmi.c | 13 +++++++++++++
>  3 files changed, 55 insertions(+), 4 deletions(-)
> 
> diff --git a/include/sound/hda_chmap.h b/include/sound/hda_chmap.h
> index e20d219..babd445 100644
> --- a/include/sound/hda_chmap.h
> +++ b/include/sound/hda_chmap.h
> @@ -36,6 +36,8 @@ struct hdac_chmap_ops {
>  	int (*chmap_validate)(struct hdac_chmap *hchmap, int ca,
>  			int channels, unsigned char *chmap);
>  
> +	int (*get_spk_alloc)(struct hdac_device *hdac, int pcm_idx);
> +
>  	void (*get_chmap)(struct hdac_device *hdac, int pcm_idx,
>  					unsigned char *chmap);
>  	void (*set_chmap)(struct hdac_device *hdac, int pcm_idx,
> diff --git a/sound/hda/hdmi_chmap.c b/sound/hda/hdmi_chmap.c
> index d7ec862..c6c75e7 100644
> --- a/sound/hda/hdmi_chmap.c
> +++ b/sound/hda/hdmi_chmap.c
> @@ -625,13 +625,30 @@ static void hdmi_cea_alloc_to_tlv_chmap(struct hdac_chmap *hchmap,
>  	WARN_ON(count != channels);
>  }
>  
> +static int spk_mask_from_spk_alloc(int spk_alloc)
> +{
> +	int i;
> +	int spk_mask = eld_speaker_allocation_bits[0];
> +
> +	for (i = 0; i < ARRAY_SIZE(eld_speaker_allocation_bits); i++) {
> +		if (spk_alloc & (1 << i))
> +			spk_mask |= eld_speaker_allocation_bits[i];
> +	}
> +
> +	return spk_mask;
> +}
> +
>  static int hdmi_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
>  			      unsigned int size, unsigned int __user *tlv)
>  {
>  	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
>  	struct hdac_chmap *chmap = info->private_data;
> +	int pcm_idx = kcontrol->private_value;
>  	unsigned int __user *dst;
>  	int chs, count = 0;
> +	unsigned long max_chs;
> +	int type;
> +	int spk_alloc, spk_mask;
>  
>  	if (size < 8)
>  		return -ENOMEM;
> @@ -639,40 +656,59 @@ static int hdmi_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
>  		return -EFAULT;
>  	size -= 8;
>  	dst = tlv + 2;
> -	for (chs = 2; chs <= chmap->channels_max; chs++) {
> +
> +	spk_alloc = chmap->ops.get_spk_alloc(chmap->hdac, pcm_idx);
> +	spk_mask = spk_mask_from_spk_alloc(spk_alloc);
> +
> +	max_chs = hweight_long(spk_mask);
> +
> +	for (chs = 2; chs <= max_chs; chs++) {
>  		int i;
>  		struct hdac_cea_channel_speaker_allocation *cap;
>  
>  		cap = channel_allocations;
>  		for (i = 0; i < ARRAY_SIZE(channel_allocations); i++, cap++) {
>  			int chs_bytes = chs * 4;
> -			int type = chmap->ops.chmap_cea_alloc_validate_get_type(
> -								chmap, cap, chs);
>  			unsigned int tlv_chmap[8];
>  
> -			if (type < 0)
> +			if (cap->channels != chs)
> +				continue;
> +
> +			if (!(cap->spk_mask == (spk_mask & cap->spk_mask)))
>  				continue;
> +
> +			type = chmap->ops.chmap_cea_alloc_validate_get_type(
> +							chmap, cap, chs);
> +			if (type < 0)
> +				return -ENODEV;
>  			if (size < 8)
>  				return -ENOMEM;
> +
>  			if (put_user(type, dst) ||
>  			    put_user(chs_bytes, dst + 1))
>  				return -EFAULT;
> +
>  			dst += 2;
>  			size -= 8;
>  			count += 8;
> +
>  			if (size < chs_bytes)
>  				return -ENOMEM;
> +
>  			size -= chs_bytes;
>  			count += chs_bytes;
>  			chmap->ops.cea_alloc_to_tlv_chmap(chmap, cap,
>  						tlv_chmap, chs);
> +
>  			if (copy_to_user(dst, tlv_chmap, chs_bytes))
>  				return -EFAULT;
>  			dst += chs;
>  		}
>  	}
> +
>  	if (put_user(count, tlv + 1))
>  		return -EFAULT;
> +
>  	return 0;
>  }
>  
> diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
> index 5af372d..dd25f2c 100644
> --- a/sound/pci/hda/patch_hdmi.c
> +++ b/sound/pci/hda/patch_hdmi.c
> @@ -1838,6 +1838,18 @@ static const struct hda_pcm_ops generic_ops = {
>  	.cleanup = generic_hdmi_playback_pcm_cleanup,
>  };
>  
> +static int hdmi_get_spk_alloc(struct hdac_device *hdac, int pcm_idx)
> +{
> +	struct hda_codec *codec = container_of(hdac, struct hda_codec, core);
> +	struct hdmi_spec *spec = codec->spec;
> +	struct hdmi_spec_per_pin *per_pin = pcm_idx_to_pin(spec, pcm_idx);
> +
> +	if (!per_pin)
> +		return 0;
> +
> +	return per_pin->sink_eld.info.spk_alloc;
> +}
> +
>  static void hdmi_get_chmap(struct hdac_device *hdac, int pcm_idx,
>  					unsigned char *chmap)
>  {
> @@ -2249,6 +2261,7 @@ static int patch_generic_hdmi(struct hda_codec *codec)
>  	spec->chmap.ops.get_chmap = hdmi_get_chmap;
>  	spec->chmap.ops.set_chmap = hdmi_set_chmap;
>  	spec->chmap.ops.is_pcm_attached = is_hdmi_pcm_attached;
> +	spec->chmap.ops.get_spk_alloc = hdmi_get_spk_alloc,
>  
>  	codec->spec = spec;
>  	hdmi_array_init(spec, 4);
> -- 
> 1.9.1
>