Remove start bit detected status after it is handled,
doing so will prevent this condition being hit for
every interrupt on a particular transfer.
Fixes: 27bce4 ("i2c: img-scb: Add Imagination Technologies I2C SCB driver")
Signed-off-by: Sifan Naeem <sifan.naeem@xxxxxxxxxx>
Cc: Stable kernel (v3.19+) <stable@xxxxxxxxxxxxxxx>
---
drivers/i2c/busses/i2c-img-scb.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/i2c/busses/i2c-img-scb.c b/drivers/i2c/busses/i2c-img-scb.c
index 653f9bd..341130e 100644
--- a/drivers/i2c/busses/i2c-img-scb.c
+++ b/drivers/i2c/busses/i2c-img-scb.c
@@ -871,10 +871,18 @@ static unsigned int img_i2c_auto(struct img_i2c *i2c,
}
/* Enable transaction halt on start bit */
- if (!i2c->last_msg && i2c->line_status & LINESTAT_START_BIT_DET) {
- img_i2c_transaction_halt(i2c, true);
- /* we're no longer interested in the slave event */
- i2c->int_enable &= ~INT_SLAVE_EVENT;
+ if (i2c->line_status & LINESTAT_START_BIT_DET) {
+ if (!i2c->last_msg) {
+ img_i2c_transaction_halt(i2c, true);
+ /* we're no longer interested in the slave event */
+ i2c->int_enable &= ~INT_SLAVE_EVENT;
+ }
+ /*
+ * Remove start bit detected status after it is handled,
+ * doing so will prevent this condition being hit for
+ * every interrupt on a particular transfer.
+ */
+ i2c->line_status &= ~LINESTAT_START_BIT_DET;
}
mod_timer(&i2c->check_timer, jiffies + msecs_to_jiffies(1));
--
1.7.9.5
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