linux-kernel - Re: [PATCH 4.19 102/219] ALSA: hda/hdmi

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Date:   Mon, 30 Dec 2019 14:58:25 +0200 (EET)
From:   Kai Vehmanen <kai.vehmanen@...ux.intel.com>
To:     Pavel Machek <pavel@...x.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Takashi Iwai <tiwai@...e.de>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 102/219] ALSA: hda/hdmi - implement mst_no_extra_pcms
 flag

Hi,

On Mon, 30 Dec 2019, Pavel Machek wrote:

> > From: Kai Vehmanen <kai.vehmanen@...ux.intel.com>
> > 
> > [ 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").
[...]
> 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.

ack on that. In upstream this flag is only used by SOF (sound/soc/sof)
currently, but SOF is not part of 4.19, so there are no users for this 
flag. Sorry for not catching this sooner.

Br, Kai