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Commit dd29207e authored by Sifan Naeem's avatar Sifan Naeem Committed by Wolfram Sang
Browse files

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: default avatarSifan Naeem <sifan.naeem@imgtec.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent a8c5a8d8

drivers/i2c/busses/i2c-img-scb.c

+10 −1
Original line number Diff line number Diff line
@@ -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 @@ static unsigned int img_i2c_auto(struct img_i2c *i2c, 


	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);