i2c-bfin-twi: add debug output for error status

Add some debug() code to decode the error register.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-bfin-twi.c b/drivers/i2c/busses/i2c-bfin-twi.c
index 441134a1df92..0279a7a6b86c 100644
--- a/drivers/i2c/busses/i2c-bfin-twi.c
+++ b/drivers/i2c/busses/i2c-bfin-twi.c
@@ -157,6 +157,18 @@ static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface)
                 write_MASTER_CTL(iface, 0);
                 SSYNC();
                 iface->result = -EIO;
+
+                if (mast_stat & LOSTARB)
+                        dev_dbg(&iface->adap.dev, "Lost Arbitration\n");
+                if (mast_stat & ANAK)
+                        dev_dbg(&iface->adap.dev, "Address Not Acknowledged\n");
+                if (mast_stat & DNAK)
+                        dev_dbg(&iface->adap.dev, "Data Not Acknowledged\n");
+                if (mast_stat & BUFRDERR)
+                        dev_dbg(&iface->adap.dev, "Buffer Read Error\n");
+                if (mast_stat & BUFWRERR)
+                        dev_dbg(&iface->adap.dev, "Buffer Write Error\n");
+
                 /* if both err and complete int stats are set, return proper
                  * results.
                  */