i2c-nomadik: fixup bus delays

We were missing a transfer delay in one execution path leading to
hangs and the bus timeout was too low leading to errors under
stress tests.

Acked-by: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Signed-off-by: Sundar R Iyer <sundar.iyer@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c
index e461de7167e7..c9fffd0389fe 100644
--- a/drivers/i2c/busses/i2c-nomadik.c
+++ b/drivers/i2c/busses/i2c-nomadik.c
@@ -103,6 +103,9 @@
 /* maximum threshold value */
 #define MAX_I2C_FIFO_THRESHOLD  15
 
+/* per-transfer delay, required for the hardware to stabilize */
+#define I2C_DELAY               150
+
 enum i2c_status {
         I2C_NOP,
         I2C_ON_GOING,
@@ -118,7 +121,7 @@ enum i2c_operation {
 };
 
 /* controller response timeout in ms */
-#define I2C_TIMEOUT_MS  500
+#define I2C_TIMEOUT_MS  2000
 
 /**
  * struct i2c_nmk_client - client specific data
@@ -267,6 +270,7 @@ static int init_hw(struct nmk_i2c_dev *dev)
 
         clk_disable(dev->clk);
 
+        udelay(I2C_DELAY);
         return 0;
 }
 
@@ -599,7 +603,7 @@ static int nmk_i2c_xfer(struct i2c_adapter *i2c_adap,
                         clk_disable(dev->clk);
                         return status;
                 }
-                mdelay(1);
+                udelay(I2C_DELAY);
         }
         clk_disable(dev->clk);