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From: Amelie Delaunay <amelie.delaunay@st.com>
To: Lee Jones <lee.jones@linaro.org>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Alexandre Torgue <alexandre.torgue@st.com>
Cc: <linux-stm32@st-md-mailman.stormreply.com>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>,
	Amelie Delaunay <amelie.delaunay@st.com>
Subject: [PATCH 3/3] mfd: stmfx: disable irq in suspend to avoid spurious interrupt
Date: Wed, 22 Apr 2020 11:08:33 +0200	[thread overview]
Message-ID: <20200422090833.9743-4-amelie.delaunay@st.com> (raw)
In-Reply-To: <20200422090833.9743-1-amelie.delaunay@st.com>

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 <amelie.delaunay@st.com>
---
 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;
-- 
2.17.1


WARNING: multiple messages have this Message-ID (diff)
From: Amelie Delaunay <amelie.delaunay@st.com>
To: Lee Jones <lee.jones@linaro.org>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Alexandre Torgue <alexandre.torgue@st.com>
Cc: Amelie Delaunay <amelie.delaunay@st.com>,
	linux-stm32@st-md-mailman.stormreply.com,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 3/3] mfd: stmfx: disable irq in suspend to avoid spurious interrupt
Date: Wed, 22 Apr 2020 11:08:33 +0200	[thread overview]
Message-ID: <20200422090833.9743-4-amelie.delaunay@st.com> (raw)
In-Reply-To: <20200422090833.9743-1-amelie.delaunay@st.com>

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 <amelie.delaunay@st.com>
---
 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;
-- 
2.17.1


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  parent reply	other threads:[~2020-04-22  9:08 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-22  9:08 [PATCH 0/3] STMFX power related fixes Amelie Delaunay
2020-04-22  9:08 ` Amelie Delaunay
2020-04-22  9:08 ` [PATCH 1/3] mfd: stmfx: reset chip on resume as supply was disabled Amelie Delaunay
2020-04-22  9:08   ` Amelie Delaunay
2020-05-26  7:57   ` Lee Jones
2020-05-26  7:57     ` Lee Jones
2020-04-22  9:08 ` [PATCH 2/3] mfd: stmfx: fix stmfx_irq_init error path Amelie Delaunay
2020-04-22  9:08   ` Amelie Delaunay
2020-05-26  7:58   ` Lee Jones
2020-05-26  7:58     ` Lee Jones
2020-04-22  9:08 ` Amelie Delaunay [this message]
2020-04-22  9:08   ` [PATCH 3/3] mfd: stmfx: disable irq in suspend to avoid spurious interrupt Amelie Delaunay
2020-05-26  7:59   ` Lee Jones
2020-05-26  7:59     ` Lee Jones
2020-05-25 12:02 ` [PATCH 0/3] STMFX power related fixes Amelie DELAUNAY
2020-05-25 12:02   ` Amelie DELAUNAY
2020-05-26  7:27   ` Lee Jones
2020-05-26  7:27     ` Lee Jones

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