diff options
| author | Shubhrajyoti D <shubhrajyoti@ti.com> | 2012-11-05 17:53:43 +0530 |
|---|---|---|
| committer | Wolfram Sang <w.sang@pengutronix.de> | 2012-11-14 17:44:43 +0100 |
| commit | ca85e248b65649176e9e1edfbf5e791bc44ee52b (patch) | |
| tree | 95e3a76b9f9310e3298dc96f0f62dd6461bc496b /drivers/i2c | |
| parent | 554c96744afd169886bd6fc2736fb0d9aaf634e8 (diff) | |
| download | lwn-ca85e248b65649176e9e1edfbf5e791bc44ee52b.tar.gz lwn-ca85e248b65649176e9e1edfbf5e791bc44ee52b.zip | |
i2c: omap: cleanup the sysc write
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@ti.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | 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 067a73922be3..482c63d53685 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -305,7 +305,11 @@ 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) & @@ -327,22 +331,8 @@ 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; } |