When mst_no_extra_pcms flag is set, the codec should not
use backup PCMs to handle DP-MST scenarios. Instead a simple
1:1 mapping is assumed between PCMs and converters.
Signed-off-by: Kai Vehmanen <kai.vehmanen@xxxxxxxxxxxxxxx>
---
include/sound/hda_codec.h | 1 +
sound/pci/hda/patch_hdmi.c | 19 ++++++++++++++-----
2 files changed, 15 insertions(+), 5 deletions(-)
diff --git a/include/sound/hda_codec.h b/include/sound/hda_codec.h
index 9a0393cf024c..ac18f428eda6 100644
--- a/include/sound/hda_codec.h
+++ b/include/sound/hda_codec.h
@@ -254,6 +254,7 @@ struct hda_codec {
unsigned int force_pin_prefix:1; /* Add location prefix */
unsigned int link_down_at_suspend:1; /* link down at runtime suspend */
unsigned int relaxed_resume:1; /* don't resume forcibly for jack */
+ unsigned int mst_no_extra_pcms:1; /* no backup PCMs for DP-MST */
#ifdef CONFIG_PM
unsigned long power_on_acct;
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index bca5de78e9ad..59aaee4a40fd 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -2072,15 +2072,24 @@ static bool is_hdmi_pcm_attached(struct hdac_device *hdac, int pcm_idx)
static int generic_hdmi_build_pcms(struct hda_codec *codec)
{
struct hdmi_spec *spec = codec->spec;
- int idx;
+ int idx, pcm_num;
/*
* for non-mst mode, pcm number is the same as before
- * for DP MST mode, pcm number is (nid number + dev_num - 1)
- * dev_num is the device entry number in a pin
- *
+ * for DP MST mode without extra PCM, pcm number is same
+ * for DP MST mode with extra PCMs, pcm number is
+ * (nid number + dev_num - 1)
+ * dev_num is the device entry number in a pin
*/
- for (idx = 0; idx < spec->num_nids + spec->dev_num - 1; idx++) {
+
+ if (codec->mst_no_extra_pcms)
+ pcm_num = spec->num_nids;
+ else
+ pcm_num = spec->num_nids + spec->dev_num - 1;
+
+ codec_dbg(codec, "hdmi: pcm_num set to %d\n", pcm_num);
+
+ for (idx = 0; idx < pcm_num; idx++) {
struct hda_pcm *info;
struct hda_pcm_stream *pstr;
--
2.17.1
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