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ASoC: hdac_hdmi: Add MST verb support 

To support DP MST audio, new pin verbs/params are added. This patch
adds helper functions to do following:
o To set a specific port
o To get the currently selected port
o To get the length of port.

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jeeja KP 2017-02-07 19:09:45 +05:30 committed by Mark Brown
parent 2acd8309a3
commit fc181b04f2
1 changed files with 70 additions and 0 deletions
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70
sound/soc/codecs/hdac_hdmi.c
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@ -142,6 +142,76 @@ hdac_hdmi_get_pcm_from_cvt(struct hdac_hdmi_priv *hdmi,
return pcm;
}
/* MST supported verbs */
/*
* Get the no devices that can be connected to a port on the Pin widget.
*/
static int hdac_hdmi_get_port_len(struct hdac_ext_device *hdac, hda_nid_t nid)
{
unsigned int caps;
unsigned int type, param;
caps = get_wcaps(&hdac->hdac, nid);
type = get_wcaps_type(caps);
if (!(caps & AC_WCAP_DIGITAL) || (type != AC_WID_PIN))
return 0;
param = snd_hdac_read_parm_uncached(&hdac->hdac, nid,
AC_PAR_DEVLIST_LEN);
if (param == -1)
return param;
return param & AC_DEV_LIST_LEN_MASK;
}
/*
* Get the port entry select on the pin. Return the port entry
* id selected on the pin. Return 0 means the first port entry
* is selected or MST is not supported.
*/
static int hdac_hdmi_port_select_get(struct hdac_ext_device *hdac,
struct hdac_hdmi_port *port)
{
return snd_hdac_codec_read(&hdac->hdac, port->pin->nid,
0, AC_VERB_GET_DEVICE_SEL, 0);
}
/*
* Sets the selected port entry for the configuring Pin widget verb.
* returns error if port set is not equal to port get otherwise success
*/
static int hdac_hdmi_port_select_set(struct hdac_ext_device *hdac,
struct hdac_hdmi_port *port)
{
int num_ports;
if (!port->pin->mst_capable)
return 0;
/* AC_PAR_DEVLIST_LEN is 0 based. */
num_ports = hdac_hdmi_get_port_len(hdac, port->pin->nid);
if (num_ports < 0)
return -EIO;
/*
* Device List Length is a 0 based integer value indicating the
* number of sink device that a MST Pin Widget can support.
*/
if (num_ports + 1 < port->id)
return 0;
snd_hdac_codec_write(&hdac->hdac, port->pin->nid, 0,
AC_VERB_SET_DEVICE_SEL, port->id);
if (port->id != hdac_hdmi_port_select_get(hdac, port))
return -EIO;
dev_dbg(&hdac->hdac.dev, "Selected the port=%d\n", port->id);
return 0;
}
static struct hdac_hdmi_pcm *get_hdmi_pcm_from_id(struct hdac_hdmi_priv *hdmi,
int pcm_idx)
{