Currently after the reset the sysc is written with hardcoded values.
The patch reads the sysc register and writes back the same value
after reset.
- Some unnecessary rev checks can be optimised.
- Also due to whatever reason the hwmod flags are changed
we will not reset the values.
- In some of the cases the minor values of the 2430 register
is different(0x37) in that case the autoidle setting may be missed.
Signed-off-by: Shubhrajyoti D <shubhrajyoti@xxxxxx>
---
drivers/i2c/busses/i2c-omap.c | 20 +++++---------------
1 files changed, 5 insertions(+), 15 deletions(-)
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 25f1564..a09acdc 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -302,7 +302,11 @@ static void __omap_i2c_init(struct omap_i2c_dev *dev)
static int omap_i2c_reset(struct omap_i2c_dev *dev)
{
unsigned long timeout;
+ u16 sysc;
+
if (dev->rev >= OMAP_I2C_OMAP1_REV_2) {
+ sysc = omap_i2c_read_reg(dev, OMAP_I2C_SYSC_REG);
+
/* Disable I2C controller before soft reset */
omap_i2c_write_reg(dev, OMAP_I2C_CON_REG,
omap_i2c_read_reg(dev, OMAP_I2C_CON_REG) &
@@ -324,22 +328,8 @@ static int omap_i2c_reset(struct omap_i2c_dev *dev)
}
/* SYSC register is cleared by the reset; rewrite it */
- if (dev->rev == OMAP_I2C_REV_ON_2430) {
-
- omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG,
- SYSC_AUTOIDLE_MASK);
+ omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, sysc);
- } else if (dev->rev >= OMAP_I2C_REV_ON_3430_3530) {
- dev->syscstate = SYSC_AUTOIDLE_MASK;
- dev->syscstate |= SYSC_ENAWAKEUP_MASK;
- dev->syscstate |= (SYSC_IDLEMODE_SMART <<
- __ffs(SYSC_SIDLEMODE_MASK));
- dev->syscstate |= (SYSC_CLOCKACTIVITY_FCLK <<
- __ffs(SYSC_CLOCKACTIVITY_MASK));
-
- omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG,
- dev->syscstate);
- }
}
return 0;
}
--
1.7.5.4
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
