[alsa-devel] [PATCH] ALSA: hda - Fix DP-MST support for NVIDIA codecs

[Takashi Iwai]

On Tue, 04 Feb 2020 11:27:46 +0100,
Nikhil Mahale wrote:
> 
> If dyn_pcm_assign is set, different jack objects are being created
> for pcm and pins.
> 
> If dyn_pcm_assign is set, generic_hdmi_build_jack() calls into
> add_hdmi_jack_kctl() to create and track separate jack object for
> pcm. Like sync_eld_via_acomp(), hdmi_present_sense_via_verbs() also
> need to report status change of the pcm jack.
> 
> Rename pin_idx_to_jack() to pin_idx_to_pcm_jack(). Update
> hdmi_present_sense_via_verbs() to report plug state of pcm jack
> object. Unlike sync_eld_via_acomp(), for !acomp drivers the pcm
> jack's plug state must be consistent with plug state
> of pin's jack.

Thanks, the new patch looks better.

> Fixes: 5398e94fb753 ("ALSA: hda - Add DP-MST support for NVIDIA codecs")
> Signed-off-by: Nikhil Mahale <nmahale at nvidia.com>

We need Cc to stable here.  I'll add it when applying.

Also, it deserves Reported-by from Martin.
Martin, could you retest with this patch?  I'll queue the patch once
after confirmation.

Just one minor nitpick:

> +		if (spec->dyn_pcm_assign && pcm_jack && !do_repoll) {
> +			int state = 0;
> +
> +			if (!!(jack->pin_sense & AC_PINSENSE_PRESENCE))
> +				state = SND_JACK_AVOUT;

The "!!" is superfluous.  I'll drop it.


Takashi