From: Jeeja KP jeeja.kp@intel.com
To support DP MST audio, new pin verbs/params are added. This patch adds helper functions to do following: 1. To set a specific port 2. To get the currently selected port 3. To get the length of port.
Signed-off-by: Jeeja KP jeeja.kp@intel.com --- sound/soc/codecs/hdac_hdmi.c | 69 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+)
diff --git a/sound/soc/codecs/hdac_hdmi.c b/sound/soc/codecs/hdac_hdmi.c index c9f4d4a..d99eb9c 100644 --- a/sound/soc/codecs/hdac_hdmi.c +++ b/sound/soc/codecs/hdac_hdmi.c @@ -125,6 +125,75 @@ struct hdac_hdmi_priv { struct hdac_chmap chmap; };
+/* 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->is_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 void hdac_hdmi_enable_cvt(struct hdac_ext_device *edev, struct hdac_hdmi_dai_port_map *dai_map);