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[5.12,644/700] ASoC: fsl_xcvr: disable all interrupts when suspend happens

Message ID 20210712061044.393621462@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman July 12, 2021, 6:12 a.m. UTC 
From: Shengjiu Wang <shengjiu.wang@nxp.com>


[ Upstream commit ea837090b388245744988083313f6e9c7c9b9699 ]

There is an unhandled interrupt after suspend, which cause endless
interrupt when system resume, so system may hang.

Disable all interrupts in runtime suspend callback to avoid above
issue.

Fixes: 28564486866f ("ASoC: fsl_xcvr: Add XCVR ASoC CPU DAI driver")
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>

Reviewed-by: Fabio Estevam <festevam@gmail.com>

Link: https://lore.kernel.org/r/1624019913-3380-1-git-send-email-shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Signed-off-by: Sasha Levin <sashal@kernel.org>

---
 sound/soc/fsl/fsl_xcvr.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

-- 
2.30.2
diff mbox series

Patch

diff --git a/sound/soc/fsl/fsl_xcvr.c b/sound/soc/fsl/fsl_xcvr.c
index 6dd0a5fcd455..070e3f32859f 100644
--- a/sound/soc/fsl/fsl_xcvr.c
+++ b/sound/soc/fsl/fsl_xcvr.c
@@ -1236,6 +1236,16 @@  static __maybe_unused int fsl_xcvr_runtime_suspend(struct device *dev)
 	struct fsl_xcvr *xcvr = dev_get_drvdata(dev);
 	int ret;
 
+	/*
+	 * Clear interrupts, when streams starts or resumes after
+	 * suspend, interrupts are enabled in prepare(), so no need
+	 * to enable interrupts in resume().
+	 */
+	ret = regmap_update_bits(xcvr->regmap, FSL_XCVR_EXT_IER0,
+				 FSL_XCVR_IRQ_EARC_ALL, 0);
+	if (ret < 0)
+		dev_err(dev, "Failed to clear IER0: %d\n", ret);
+
 	/* Assert M0+ reset */
 	ret = regmap_update_bits(xcvr->regmap, FSL_XCVR_EXT_CTRL,
 				 FSL_XCVR_EXT_CTRL_CORE_RESET,