Hi!
> From: Kai Vehmanen <kai.vehmanen@xxxxxxxxxxxxxxx>
>
> [ Upstream commit 2a2edfbbfee47947dd05f5860c66c0e80ee5e09d ]
>
> To support the DP-MST multiple streams via single connector feature,
> the HDMI driver was extended with the concept of backup PCMs. See
> commit 9152085defb6 ("ALSA: hda - add DP MST audio support").
...
> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
This variable is not ever set in this patch, nor is it set elsewhere
in 4.19-stable. This means this patch is not suitable for stable.
Best regards,
Pavel
> index 2003403ce1c8..199927694aef 100644
> --- a/sound/pci/hda/hda_codec.h
> +++ b/sound/pci/hda/hda_codec.h
> @@ -262,6 +262,7 @@ 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 c827a2a89cc3..9d5e3c8d62b9 100644
> --- a/sound/pci/hda/patch_hdmi.c
> +++ b/sound/pci/hda/patch_hdmi.c
> @@ -2063,15 +2063,24 @@ 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;
>
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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