From f868fc355ad852b476950c2fe4f5bae7480e8f04 Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Thu, 23 Sep 2010 09:04:11 +0200 Subject: [PATCH] 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 Signed-off-by: Sundar R Iyer Signed-off-by: Linus Walleij Signed-off-by: Ben Dooks --- drivers/i2c/busses/i2c-nomadik.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) 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 @@ 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); -- 2.7.4