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>
diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c
index e461de7..c9fffd0 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 @@
};
/* 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 @@
clk_disable(dev->clk);
+ udelay(I2C_DELAY);
return 0;
}
@@ -599,7 +603,7 @@
clk_disable(dev->clk);
return status;
}
- mdelay(1);
+ udelay(I2C_DELAY);
}
clk_disable(dev->clk);