diff options
Diffstat (limited to 'drivers/i2c/designware_i2c.c')
| -rw-r--r-- | drivers/i2c/designware_i2c.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c index 9ccc241..d11d47d 100644 --- a/drivers/i2c/designware_i2c.c +++ b/drivers/i2c/designware_i2c.c @@ -82,6 +82,7 @@ static unsigned int __dw_i2c_set_bus_speed(struct i2c_regs *i2c_base, { unsigned int cntl; unsigned int hcnt, lcnt; + unsigned int ena; int i2c_spd; if (speed >= I2C_MAX_SPEED) @@ -91,6 +92,9 @@ static unsigned int __dw_i2c_set_bus_speed(struct i2c_regs *i2c_base, else i2c_spd = IC_SPEED_MODE_STANDARD; + /* Get enable setting for restore later */ + ena = readl(&i2c_base->ic_enable) & IC_ENABLE_0B; + /* to set speed cltr must be disabled */ dw_i2c_enable(i2c_base, false); @@ -146,8 +150,9 @@ static unsigned int __dw_i2c_set_bus_speed(struct i2c_regs *i2c_base, if (scl_sda_cfg) writel(scl_sda_cfg->sda_hold, &i2c_base->ic_sda_hold); - /* Enable back i2c now speed set */ - dw_i2c_enable(i2c_base, true); + /* Restore back i2c now speed set */ + if (ena == IC_ENABLE_0B) + dw_i2c_enable(i2c_base, true); return 0; } |