ALSA: hda - Add support for HDMI HBR passthrough

Passing IEC 61937 encapsulated compressed audio at bitrates over 6.144
Mbps (i.e. more than a single 2-channel 16-bit 192kHz IEC 60958 link)
over HDMI requires the use of HBR Audio Stream Packets instead of Audio
Sample Packets.

Enable HBR mode when the stream has 8 channels and the Non-PCM bit is
set.

If the audio converter is not connected to any HBR-capable pins, return
-EINVAL in prepare().

Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 39 insertions, 1 deletions

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index 2fc53961054e..8534792591fc 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -698,11 +698,48 @@ static void hdmi_unsol_event(struct hda_codec *codec, unsigned int res)
  * Callbacks
  */
 
-static void hdmi_setup_stream(struct hda_codec *codec, hda_nid_t nid,
+static int hdmi_setup_stream(struct hda_codec *codec, hda_nid_t nid,
                               u32 stream_tag, int format)
 {
+        struct hdmi_spec *spec = codec->spec;
         int tag;
         int fmt;
+        int pinctl;
+        int new_pinctl = 0;
+        int i;
+
+        for (i = 0; i < spec->num_pins; i++) {
+                if (spec->pin_cvt[i] != nid)
+                        continue;
+                if (!(snd_hda_query_pin_caps(codec, spec->pin[i]) & AC_PINCAP_HBR))
+                        continue;
+
+                pinctl = snd_hda_codec_read(codec, spec->pin[i], 0,
+                                            AC_VERB_GET_PIN_WIDGET_CONTROL, 0);
+
+                new_pinctl = pinctl & ~AC_PINCTL_EPT;
+                /* Non-PCM, 8 channels */
+                if ((format & 0x8000) && (format & 0x0f) == 7)
+                        new_pinctl |= AC_PINCTL_EPT_HBR;
+                else
+                        new_pinctl |= AC_PINCTL_EPT_NATIVE;
+
+                snd_printdd("hdmi_setup_stream: "
+                            "NID=0x%x, %spinctl=0x%x\n",
+                            spec->pin[i],
+                            pinctl == new_pinctl ? "" : "new-",
+                            new_pinctl);
+
+                if (pinctl != new_pinctl)
+                        snd_hda_codec_write(codec, spec->pin[i], 0,
+                                            AC_VERB_SET_PIN_WIDGET_CONTROL,
+                                            new_pinctl);
+        }
+
+        if ((format & 0x8000) && (format & 0x0f) == 7 && !new_pinctl) {
+                snd_printdd("hdmi_setup_stream: HBR is not supported\n");
+                return -EINVAL;
+        }
 
         tag = snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_CONV, 0) >> 4;
         fmt = snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_STREAM_FORMAT, 0);
@@ -722,6 +759,7 @@ static void hdmi_setup_stream(struct hda_codec *codec, hda_nid_t nid,
         if (fmt != format)
                 snd_hda_codec_write(codec, nid, 0,
                                     AC_VERB_SET_STREAM_FORMAT, format);
+        return 0;
 }
 
 /*