i2c: img-scb: add handle for stop detected interrupt
Stop Detected interrupt is triggered when a Stop bit is detected on
the bus, which indicates the end of the current transfer.
When the end of a transfer is indicated by the Stop Detected interrupt,
drain the FIFO and signal completion for the transaction.
Signed-off-by: Sifan Naeem <sifan.naeem@imgtec.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
diff --git a/drivers/i2c/busses/i2c-img-scb.c b/drivers/i2c/busses/i2c-img-scb.c
index 0af554a..f416010 100644
--- a/drivers/i2c/busses/i2c-img-scb.c
+++ b/drivers/i2c/busses/i2c-img-scb.c
@@ -152,6 +152,7 @@
#define INT_TRANSACTION_DONE BIT(15)
#define INT_SLAVE_EVENT BIT(16)
#define INT_TIMING BIT(18)
+#define INT_STOP_DETECTED BIT(19)
#define INT_FIFO_FULL_FILLING (INT_FIFO_FULL | INT_FIFO_FILLING)
@@ -175,7 +176,8 @@
INT_WRITE_ACK_ERR | \
INT_FIFO_FULL | \
INT_FIFO_FILLING | \
- INT_FIFO_EMPTY)
+ INT_FIFO_EMPTY | \
+ INT_STOP_DETECTED)
#define INT_ENABLE_MASK_WAITSTOP (INT_SLAVE_EVENT | \
INT_ADDR_ACK_ERR | \
@@ -865,6 +867,13 @@
mod_timer(&i2c->check_timer, jiffies + msecs_to_jiffies(1));
+ if (int_status & INT_STOP_DETECTED) {
+ /* Drain remaining data in FIFO and complete transaction */
+ if (i2c->msg.flags & I2C_M_RD)
+ img_i2c_read_fifo(i2c);
+ return ISR_COMPLETE(0);
+ }
+
if (i2c->msg.flags & I2C_M_RD) {
if (int_status & INT_FIFO_FULL_FILLING) {
img_i2c_read_fifo(i2c);