[alsa-devel] [PATCH] ASoC: hdac_hdmi: Program pin-port-mux during jack report event

[Guneshwor Singh]

From: Sriram Periyasamy <sriramx.periyasamy at intel.com>

During d3/d0 cycle, the connection selection index of all pins points
to the default value. This needs to be restored to ensure audio is
restored after d3/d0 cycle.

So store the connection selection index and program it during jack
report event which gets invoked in cases like d3/d0 cycle, hot plug
detection when multiple displays are connected.

Signed-off-by: Sriram Periyasamy <sriramx.periyasamy at intel.com>
Signed-off-by: Sanyog Kale <sanyog.r.kale at intel.com>
Signed-off-by: Jeeja KP <jeeja.kp at intel.com>
Signed-off-by: Guneshwor Singh <guneshwor.o.singh at intel.com>
---
 sound/soc/codecs/hdac_hdmi.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/sound/soc/codecs/hdac_hdmi.c b/sound/soc/codecs/hdac_hdmi.c
index dba6f4c5074a..cabcb75bf4fc 100644
--- a/sound/soc/codecs/hdac_hdmi.c
+++ b/sound/soc/codecs/hdac_hdmi.c
@@ -32,6 +32,7 @@
 #include <sound/hda_chmap.h>
 #include "../../hda/local.h"
 #include "hdac_hdmi.h"
+#include <sound/hda_regmap.h>
 
 #define NAME_SIZE	32
 
@@ -83,6 +84,7 @@ struct hdac_hdmi_pin {
 	struct list_head head;
 	hda_nid_t nid;
 	bool mst_capable;
+	int conn_index;
 	struct hdac_hdmi_port *ports;
 	int num_ports;
 	struct hdac_ext_device *edev;
@@ -141,6 +143,9 @@ struct hdac_hdmi_priv {
 
 #define hdev_to_hdmi_priv(_hdev) ((to_ehdac_device(_hdev))->private_data)
 
+static int hdac_hdmi_port_select_set(struct hdac_ext_device *edev,
+					struct hdac_hdmi_port *port);
+
 static struct hdac_hdmi_pcm *
 hdac_hdmi_get_pcm_from_cvt(struct hdac_hdmi_priv *hdmi,
 			   struct hdac_hdmi_cvt *cvt)
@@ -159,6 +164,7 @@ static void hdac_hdmi_jack_report(struct hdac_hdmi_pcm *pcm,
 		struct hdac_hdmi_port *port, bool is_connect)
 {
 	struct hdac_ext_device *edev = port->pin->edev;
+	int cmd, err;
 
 	if (is_connect)
 		snd_soc_dapm_enable_pin(port->dapm, port->jack_pin);
@@ -166,6 +172,29 @@ static void hdac_hdmi_jack_report(struct hdac_hdmi_pcm *pcm,
 		snd_soc_dapm_disable_pin(port->dapm, port->jack_pin);
 
 	if (is_connect) {
+		/* set the device if pin is mst_capable */
+		if (hdac_hdmi_port_select_set(edev, port) < 0) {
+			dev_err(&edev->hdev.dev,
+				"port %d device select fail\n", port->id);
+			return;
+		}
+		/*
+		 * Restore the connection selection index of the
+		 * respective pin.
+		 */
+		if (port->pin->conn_index > 0) {
+			cmd = snd_hdac_regmap_encode_verb(port->pin->nid,
+						AC_VERB_SET_CONNECT_SEL);
+			err = snd_hdac_regmap_write_raw(&edev->hdev, cmd,
+						port->pin->conn_index - 1);
+			if (err < 0) {
+				dev_err(&edev->hdev.dev,
+					"pin %d conn select index fail %d\n",
+					port->pin->nid, err);
+				return;
+			}
+		}
+
 		/*
 		 * Report Jack connect event when a device is connected
 		 * for the first time where same PCM is attached to multiple
@@ -891,6 +920,9 @@ static int hdac_hdmi_set_pin_port_mux(struct snd_kcontrol *kcontrol,
 		}
 	}
 
+	if (ucontrol->value.enumerated.item[0] > 0)
+		port->pin->conn_index =	ucontrol->value.enumerated.item[0];
+
 	/*
 	 * Jack status is not reported during device probe as the
 	 * PCMs are not registered by then. So report it here.
-- 
2.16.1