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| author | Paul Mundt <lethal@linux-sh.org> | 2010-01-06 15:49:08 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2010-01-06 15:49:08 +0900 |
| commit | fa94ddea2b29fdda7640672c8a933dbd901f0278 (patch) | |
| tree | 4e9204f1438f5ed44bff31e2abee598ad775321d /drivers/i2c/busses/i2c-omap.c | |
| parent | 6fbfe8d7cd7e71ceb281c5a1b9de6e5e0dfbf1c8 (diff) | |
| parent | 56d45b62ce622a003da972428fdbba2b42102efb (diff) | |
Merge branch 'master' into sh/hw-breakpoints
Diffstat (limited to 'drivers/i2c/busses/i2c-omap.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-omap.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 75bf3ad1809..0037e31076b 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -247,7 +247,13 @@ static void omap_i2c_unidle(struct omap_i2c_dev *dev) omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); } dev->idle = 0; - omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate); + + /* + * Don't write to this register if the IE state is 0 as it can + * cause deadlock. + */ + if (dev->iestate) + omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate); } static void omap_i2c_idle(struct omap_i2c_dev *dev) @@ -280,6 +286,11 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) unsigned long internal_clk = 0; if (dev->rev >= OMAP_I2C_REV_2) { + /* Disable I2C controller before soft reset */ + omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, + omap_i2c_read_reg(dev, OMAP_I2C_CON_REG) & + ~(OMAP_I2C_CON_EN)); + omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, SYSC_SOFTRESET_MASK); /* For some reason we need to set the EN bit before the * reset done bit gets set. */ |