linux-kernel - [PATCH 5.14 03/30] ASoC: Intel: sof_sdw: tag SoundWire BEs as non-atomic

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Message-Id: <20211014145209.636596332@linuxfoundation.org>
Date:   Thu, 14 Oct 2021 16:54:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Takashi Iwai <tiwai@...e.de>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Rander Wang <rander.wang@...el.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Bard Liao <bard.liao@...el.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.14 03/30] ASoC: Intel: sof_sdw: tag SoundWire BEs as non-atomic

From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>

[ Upstream commit 58eafe1ff52ee1ce255759fc15729519af180cbb ]

The SoundWire BEs make use of 'stream' functions for .prepare and
.trigger. These functions will in turn force a Bank Switch, which
implies a wait operation.

Mark SoundWire BEs as nonatomic for consistency, but keep all other
types of BEs as is. The initialization of .nonatomic is done outside
of the create_sdw_dailink helper to avoid adding more parameters to
deal with a single exception to the rule that BEs are atomic.

Suggested-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Reviewed-by: Rander Wang <rander.wang@...el.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>
Reviewed-by: Bard Liao <bard.liao@...el.com>
Link: https://lore.kernel.org/r/20210907184436.33152-1-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/intel/boards/sof_sdw.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sound/soc/intel/boards/sof_sdw.c b/sound/soc/intel/boards/sof_sdw.c
index 1a867c73a48e..cb3afc4519cf 100644
--- a/sound/soc/intel/boards/sof_sdw.c
+++ b/sound/soc/intel/boards/sof_sdw.c
@@ -860,6 +860,11 @@ static int create_sdw_dailink(struct device *dev, int *be_index,
 			      cpus + *cpu_id, cpu_dai_num,
 			      codecs, codec_num,
 			      NULL, &sdw_ops);
+		/*
+		 * SoundWire DAILINKs use 'stream' functions and Bank Switch operations
+		 * based on wait_for_completion(), tag them as 'nonatomic'.
+		 */
+		dai_links[*be_index].nonatomic = true;
 
 		ret = set_codec_init_func(link, dai_links + (*be_index)++,
 					  playback, group_id);
-- 
2.33.0