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i2c: img-scb: add handle for stop detected interrupt

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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>
This commit is contained in:
Sifan Naeem 2015-11-19 09:35:15 +00:00 committed by Wolfram Sang
parent a8c5a8d8c9
commit dd29207e6c
1 changed files with 10 additions and 1 deletions
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11
drivers/i2c/busses/i2c-img-scb.c
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@ -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);