i2c-designware: Enable RX_FULL interrupt

Enable RX_FULL interrupt mask by default, and hook it in the interrupt
handler.  If requested amount of rx data (defined by IC_RX_TL) is not
available, we don't have to process i2c_dw_read().

Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Acked-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/i2c/busses/i2c-designware.c b/drivers/i2c/busses/i2c-designware.c
index 0eea0dd3589..940bbf31bc8 100644
--- a/drivers/i2c/busses/i2c-designware.c
+++ b/drivers/i2c/busses/i2c-designware.c
@@ -342,7 +342,7 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
         u32 addr = msgs[dev->msg_write_idx].addr;
         u32 buf_len = dev->tx_buf_len;
 
-        intr_mask = DW_IC_INTR_STOP_DET | DW_IC_INTR_TX_ABRT;
+        intr_mask = DW_IC_INTR_STOP_DET | DW_IC_INTR_TX_ABRT | DW_IC_INTR_RX_FULL;
 
         if (!(dev->status & STATUS_WRITE_IN_PROGRESS)) {
                 /* Disable the adapter */
@@ -593,10 +593,11 @@ static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id)
                 dev->status = STATUS_IDLE;
         }
 
-        if (stat & DW_IC_INTR_TX_EMPTY) {
+        if (stat & DW_IC_INTR_RX_FULL)
                 i2c_dw_read(dev);
+
+        if (stat & DW_IC_INTR_TX_EMPTY)
                 i2c_dw_xfer_msg(dev);
-        }
 
         /*
          * No need to modify or disable the interrupt mask here.