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Subject[PATCH 5.11 315/775] i2c: iproc: handle only slave interrupts which are enabled
Date
From: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>

[ Upstream commit 545f4011e156554d704d6278245d54543f6680d1 ]

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>
Acked-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 d8295b1c379d1..b98433c04d184 100644
--- a/drivers/i2c/busses/i2c-bcm-iproc.c
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -505,12 +505,17 @@ 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
--
2.27.0


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