4.2.8-ckt1 -stable review patch. If anyone has any objections, please let me
know.
------------------
From: Sifan Naeem <sifan.na...@imgtec.com>
commit 1ed6faedfc9741cca2d97b25ab73902ba7177093 upstream.
Clear line status and all generated interrupts from the interrupt
status register before starting a transfer, as we may have
unserviced interrupts from previous transfers that might be
handled in the context of the new transfer.
Fixes: commit 27bce457d588 ("i2c: img-scb: Add Imagination Technologies I2C SCB
driver")
Signed-off-by: Sifan Naeem <sifan.na...@imgtec.com>
Acked-by: James Hogan <james.ho...@imgtec.com>
Reviewed-by: James Hartley <james.hart...@imgtec.com>
Signed-off-by: Wolfram Sang <w...@the-dreams.de>
Signed-off-by: Kamal Mostafa <ka...@canonical.com>
---
drivers/i2c/busses/i2c-img-scb.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/i2c/busses/i2c-img-scb.c b/drivers/i2c/busses/i2c-img-scb.c
index e4daebc..b14eeae 100644
--- a/drivers/i2c/busses/i2c-img-scb.c
+++ b/drivers/i2c/busses/i2c-img-scb.c
@@ -1060,6 +1060,15 @@ static int img_i2c_xfer(struct i2c_adapter *adap, struct
i2c_msg *msgs,
i2c->last_msg = (i == num - 1);
reinit_completion(&i2c->msg_complete);
+ /*
+ * Clear line status and all interrupts before starting a
+ * transfer, as we may have unserviced interrupts from
+ * previous transfers that might be handled in the context
+ * of the new transfer.
+ */
+ img_i2c_writel(i2c, SCB_INT_CLEAR_REG, ~0);
+ img_i2c_writel(i2c, SCB_CLEAR_REG, ~0);
+
if (atomic)
img_i2c_atomic_start(i2c);
else if (msg->flags & I2C_M_RD)
--
1.9.1
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