linux-kernel - [PATCH 1/3] ASoC: ep93xx: i2s: move enable call to startup callback

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Date:   Tue, 11 Apr 2023 00:39:00 +0200
From:   Alexander Sverdlin <alexander.sverdlin@...il.com>
To:     alsa-devel@...a-project.org
Cc:     Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Nikita Shubin <nikita.shubin@...uefel.me>,
        David Rhodes <david.rhodes@...rus.com>,
        James Schulman <james.schulman@...rus.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Liam Girdwood <lgirdwood@...il.com>,
        linux-kernel@...r.kernel.org,
        Lucas Tanure <tanureal@...nsource.cirrus.com>,
        Mark Brown <broonie@...nel.org>, patches@...nsource.cirrus.com,
        Richard Fitzgerald <rf@...nsource.cirrus.com>,
        Takashi Iwai <tiwai@...e.com>
Subject: [PATCH 1/3] ASoC: ep93xx: i2s: move enable call to startup callback

Make startup/shutdown callbacks symmetric to avoid clock subsystem warnings
(reproduced with "aplay --dump-hw-params" + ctrl-c):

WARNING: CPU: 0 PID: 102 at drivers/clk/clk.c:1048 clk_core_disable
lrclk already disabled
CPU: 0 PID: 102 Comm: aplay Not tainted 6.2.0-rc4 #1
Hardware name: Generic DT based system
 ...
 clk_core_disable from clk_core_disable_lock
 clk_core_disable_lock from ep93xx_i2s_shutdown
 ep93xx_i2s_shutdown from snd_soc_dai_shutdown
 snd_soc_dai_shutdown from soc_pcm_clean
 soc_pcm_clean from soc_pcm_close
 soc_pcm_close from snd_pcm_release_substream.part.0
 snd_pcm_release_substream.part.0 from snd_pcm_release
 snd_pcm_release from __fput
 __fput from task_work_run
 ...

WARNING: CPU: 0 PID: 102 at drivers/clk/clk.c:907 clk_core_unprepare
lrclk already unprepared
CPU: 0 PID: 102 Comm: aplay Tainted: G        W          6.2.0-rc4 #1
Hardware name: Generic DT based system
 ...
 clk_core_unprepare from clk_unprepare
 clk_unprepare from ep93xx_i2s_shutdown
 ep93xx_i2s_shutdown from snd_soc_dai_shutdown
 snd_soc_dai_shutdown from soc_pcm_clean
 soc_pcm_clean from soc_pcm_close
 soc_pcm_close from snd_pcm_release_substream.part.0
 snd_pcm_release_substream.part.0 from snd_pcm_release
 snd_pcm_release from __fput
 __fput from task_work_run
 ...

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...il.com>
---
 sound/soc/cirrus/ep93xx-i2s.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/sound/soc/cirrus/ep93xx-i2s.c b/sound/soc/cirrus/ep93xx-i2s.c
index 200d18060f7c..bbbb1065b2f1 100644
--- a/sound/soc/cirrus/ep93xx-i2s.c
+++ b/sound/soc/cirrus/ep93xx-i2s.c
@@ -209,6 +209,16 @@ static int ep93xx_i2s_dai_probe(struct snd_soc_dai *dai)
 	return 0;
 }

+static int ep93xx_i2s_startup(struct snd_pcm_substream *substream,
+			      struct snd_soc_dai *dai)
+{
+	struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(dai);
+
+	ep93xx_i2s_enable(info, substream->stream);
+
+	return 0;
+}
+
 static void ep93xx_i2s_shutdown(struct snd_pcm_substream *substream,
 				struct snd_soc_dai *dai)
 {
@@ -349,7 +359,6 @@ static int ep93xx_i2s_hw_params(struct snd_pcm_substream *substream,
 	if (err)
 		return err;

-	ep93xx_i2s_enable(info, substream->stream);
 	return 0;
 }

@@ -398,6 +407,7 @@ static int ep93xx_i2s_resume(struct snd_soc_component *component)
 #endif

 static const struct snd_soc_dai_ops ep93xx_i2s_dai_ops = {
+	.startup	= ep93xx_i2s_startup,
 	.shutdown	= ep93xx_i2s_shutdown,
 	.hw_params	= ep93xx_i2s_hw_params,
 	.set_sysclk	= ep93xx_i2s_set_sysclk,
-- 
2.40.0