linux-kernel - Applied "ASoC: mchp-i2s-mcc: Fix unprepare of GCLK" to the asoc tree

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Message-Id: <20190820174103.8E819274314E@ypsilon.sirena.org.uk>
Date:   Tue, 20 Aug 2019 18:41:03 +0100 (BST)
From:   Mark Brown <broonie@...nel.org>
To:     Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
Cc:     alexandre.belloni@...tlin.com, alsa-devel@...a-project.org,
        broonie@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, ludovic.desroches@...rochip.com,
        Mark Brown <broonie@...nel.org>, nicolas.ferre@...rochip.com,
        perex@...ex.cz, tiwai@...e.com
Subject: Applied "ASoC: mchp-i2s-mcc: Fix unprepare of GCLK" to the asoc tree

The patch

   ASoC: mchp-i2s-mcc: Fix unprepare of GCLK

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-5.3

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 988b59467b2b14523a266957affbe9eca3e99fc9 Mon Sep 17 00:00:00 2001
From: Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
Date: Tue, 20 Aug 2019 19:24:09 +0300
Subject: [PATCH] ASoC: mchp-i2s-mcc: Fix unprepare of GCLK

If hw_free() gets called after hw_params(), GCLK remains prepared,
preventing further use of it. This patch fixes this by unpreparing the
clock in hw_free() or if hw_params() gets an error.

Fixes: 7e0cdf545a55 ("ASoC: mchp-i2s-mcc: add driver for I2SC Multi-Channel Controller")
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
Link: https://lore.kernel.org/r/20190820162411.24836-2-codrin.ciubotariu@microchip.com
Signed-off-by: Mark Brown <broonie@...nel.org>
---
 sound/soc/atmel/mchp-i2s-mcc.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/sound/soc/atmel/mchp-i2s-mcc.c b/sound/soc/atmel/mchp-i2s-mcc.c
index 86495883ca3f..319f975586f1 100644
--- a/sound/soc/atmel/mchp-i2s-mcc.c
+++ b/sound/soc/atmel/mchp-i2s-mcc.c
@@ -670,8 +670,13 @@ static int mchp_i2s_mcc_hw_params(struct snd_pcm_substream *substream,
 	}
 
 	ret = regmap_write(dev->regmap, MCHP_I2SMCC_MRA, mra);
-	if (ret < 0)
+	if (ret < 0) {
+		if (dev->gclk_use) {
+			clk_unprepare(dev->gclk);
+			dev->gclk_use = 0;
+		}
 		return ret;
+	}
 	return regmap_write(dev->regmap, MCHP_I2SMCC_MRB, mrb);
 }
 
@@ -708,9 +713,13 @@ static int mchp_i2s_mcc_hw_free(struct snd_pcm_substream *substream,
 		regmap_write(dev->regmap, MCHP_I2SMCC_CR, MCHP_I2SMCC_CR_CKDIS);
 
 		if (dev->gclk_running) {
-			clk_disable_unprepare(dev->gclk);
+			clk_disable(dev->gclk);
 			dev->gclk_running = 0;
 		}
+		if (dev->gclk_use) {
+			clk_unprepare(dev->gclk);
+			dev->gclk_use = 0;
+		}
 	}
 
 	return 0;
-- 
2.20.1