After several testings and experiment, it appears that waitdelay calculation
formula was giving different behavior on the i2c status registers.
Experiment shows waitdelay needs to be extended at least 4 times to get
proper results.
Signed-off-by: Christophe Ricard <christophe-h.ric...@st.com>
---
drivers/i2c/omap24xx_i2c.c | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/drivers/i2c/omap24xx_i2c.c b/drivers/i2c/omap24xx_i2c.c
index f3a4d96..d6e5fe9 100644
--- a/drivers/i2c/omap24xx_i2c.c
+++ b/drivers/i2c/omap24xx_i2c.c
@@ -168,6 +168,13 @@ static int omap24_i2c_setspeed(struct udevice *adap,
unsigned int speed)
scll = (unsigned int)hsscll << 8 | (unsigned int)fsscll;
sclh = (unsigned int)hssclh << 8 | (unsigned int)fssclh;
+#ifdef CONFIG_SYS_I2C
+ adap->speed = speed;
+ adap->waitdelay = (10000000 / speed) * 8; /* wait for 20
clkperiods */
+#else
+ i2c_bus->clock_frequency = speed;
+ i2c_bus->waitdelay = (10000000 / speed) * 8; /* wait for 20
clkperiods */
+#endif
} else {
/* Standard and fast speed */
psc = omap24_i2c_findpsc(&scll, &sclh, speed);
@@ -175,15 +182,15 @@ static int omap24_i2c_setspeed(struct udevice *adap,
unsigned int speed)
puts("Error : I2C initializing clock\n");
return -1;
}
- }
#ifdef CONFIG_SYS_I2C
- adap->speed = speed;
- adap->waitdelay = (10000000 / speed) * 2; /* wait for 20 clkperiods */
+ adap->speed = speed;
+ adap->waitdelay = (10000000 / speed) * 2; /* wait for 20
clkperiods */
#else
- i2c_bus->clock_frequency = speed;
- i2c_bus->waitdelay = (10000000 / speed) * 2; /* wait for 20 clkperiods
*/
+ i2c_bus->clock_frequency = speed;
+ i2c_bus->waitdelay = (10000000 / speed) * 2; /* wait for 20
clkperiods */
#endif
+ }
writew(0, &i2c_base->con);
writew(psc, &i2c_base->psc);
@@ -467,7 +474,6 @@ static int omap24_i2c_read(struct udevice *adap, uchar
chip, uint addr,
i2c_bus = dev_get_priv(adap);
i2c_base = i2c_bus->i2c_base;
#endif
-
if (alen < 0) {
puts("I2C read: addr len < 0\n");
return 1;
--
2.5.0
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