linux-kernel - [PATCH v2 0/3] ALSA: compress: Document stream states and fix gapless SM

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Date:   Mon, 22 Jun 2020 12:28:08 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Takashi Iwai <tiwai@...e.com>, Jaroslav Kysela <perex@...ex.cz>
Cc:     linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/3] ALSA: compress: Document stream states and fix gapless SM

Srini found issue with gapless implementation which prompted to look deeper
into SM for compressed stream.

So documenting SM was first step, so first two patches add that. Last patch
fixes the issue by keeping track on partial_drain and then moving state to
'running' in snd_compr_drain_notify() for partial_drain case on success.
While at it, noticed snd_compr_drain_notify() is lockless state change, so
fixed that as well.

I have tested this on Dragon board RB3, compressed audio works out of the
box on that platform and Srini will send driver and fcplay patches for
gapless soon.

Changes in v2:
 - Added tested tag by Srini
 - Update compress SM with Free state and compr_stop() transitions

Vinod Koul (3):
  ALSA: compress: document the compress audio state machine
  ALSA: compress: document the compress gapless audio state machine
  ALSA: compress: fix partial_drain completion state

 .../sound/designs/compress-offload.rst        | 84 +++++++++++++++++++
 include/sound/compress_driver.h               | 12 ++-
 sound/core/compress_offload.c                 |  4 +
 3 files changed, 99 insertions(+), 1 deletion(-)

-- 
2.26.2