[PATCH AUTOSEL 5.7 275/388] mfd: stmfx: Disable IRQ in suspend to avoid spurious interrupt
From: Sasha Levin <sashal@kernel.org>
Date: 2020-06-18 02:36:08
Also in:
lkml, stable
Subsystem:
multifunction devices (mfd), the rest · Maintainers:
Lee Jones, Linus Torvalds
From: Amelie Delaunay <redacted>
[ Upstream commit 97eda5dcc2cde5dcc778bef7a9344db3b6bf8ef5 ]
When STMFX supply is stopped, spurious interrupt can occur. To avoid that,
disable the interrupt in suspend before disabling the regulator and
re-enable it at the end of resume.
Fixes: 06252ade9156 ("mfd: Add ST Multi-Function eXpander (STMFX) core driver")
Signed-off-by: Amelie Delaunay <redacted>
Signed-off-by: Lee Jones <redacted>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/mfd/stmfx.c | 6 ++++++
include/linux/mfd/stmfx.h | 1 +
2 files changed, 7 insertions(+)
diff --git a/drivers/mfd/stmfx.c b/drivers/mfd/stmfx.c
index 1977fe95f876..711979afd90a 100644
--- a/drivers/mfd/stmfx.c
+++ b/drivers/mfd/stmfx.c@@ -296,6 +296,8 @@ static int stmfx_irq_init(struct i2c_client *client) if (ret) goto irq_exit; + stmfx->irq = client->irq; + return 0; irq_exit:
@@ -486,6 +488,8 @@ static int stmfx_suspend(struct device *dev) if (ret) return ret; + disable_irq(stmfx->irq); + if (stmfx->vdd) return regulator_disable(stmfx->vdd);
@@ -529,6 +533,8 @@ static int stmfx_resume(struct device *dev) if (ret) return ret; + enable_irq(stmfx->irq); + return 0; } #endif
diff --git a/include/linux/mfd/stmfx.h b/include/linux/mfd/stmfx.h
index 3c67983678ec..744dce63946e 100644
--- a/include/linux/mfd/stmfx.h
+++ b/include/linux/mfd/stmfx.h@@ -109,6 +109,7 @@ struct stmfx { struct device *dev; struct regmap *map; struct regulator *vdd; + int irq; struct irq_domain *irq_domain; struct mutex lock; /* IRQ bus lock */ u8 irq_src;
--
2.25.1
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