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From:   Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
To:     Ray Jui <rjui@broadcom.com>, Scott Branden <sbranden@broadcom.com>,
        bcm-kernel-feedback-list@broadcom.com,
        Wolfram Sang <wsa@kernel.org>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Brendan Higgins <brendanhiggins@google.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Lori Hikichi <lori.hikichi@broadcom.com>,
        Dhananjay Phadke <dphadke@linux.microsoft.com>,
        linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org
Cc:     Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Subject: [PATCH v2 2/6] i2c: iproc: handle only slave interrupts which are enabled
Date:   Fri, 30 Oct 2020 12:23:35 +0530
Message-Id: <20201030065339.955-3-rayagonda.kokatanur@broadcom.com>
In-Reply-To: <20201030065339.955-1-rayagonda.kokatanur@broadcom.com>
References: <20201030065339.955-1-rayagonda.kokatanur@broadcom.com>
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--00000000000015dddb05b2dddd60

Handle only slave interrupts which are enabled.

The IS_OFFSET register contains the interrupt status bits which will be
set regardless of the enabling of the corresponding interrupt condition.
One must therefore look at both IS_OFFSET and IE_OFFSET to determine
whether an interrupt condition is set and enabled.

Fixes: c245d94ed106 ("i2c: iproc: Add multi byte read-write support for slave mode")
Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
---
 drivers/i2c/busses/i2c-bcm-iproc.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
index 834a98caeada..b54f5130d246 100644
--- a/drivers/i2c/busses/i2c-bcm-iproc.c
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -507,12 +507,17 @@ static void bcm_iproc_i2c_process_m_event(struct bcm_iproc_i2c_dev *iproc_i2c,
 static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
 {
 	struct bcm_iproc_i2c_dev *iproc_i2c = data;
-	u32 status = iproc_i2c_rd_reg(iproc_i2c, IS_OFFSET);
+	u32 slave_status;
+	u32 status;
 	bool ret;
-	u32 sl_status = status & ISR_MASK_SLAVE;
 
-	if (sl_status) {
-		ret = bcm_iproc_i2c_slave_isr(iproc_i2c, sl_status);
+	status = iproc_i2c_rd_reg(iproc_i2c, IS_OFFSET);
+	/* process only slave interrupt which are enabled */
+	slave_status = status & iproc_i2c_rd_reg(iproc_i2c, IE_OFFSET) &
+		       ISR_MASK_SLAVE;
+
+	if (slave_status) {
+		ret = bcm_iproc_i2c_slave_isr(iproc_i2c, slave_status);
 		if (ret)
 			return IRQ_HANDLED;
 		else
-- 
2.17.1


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