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i2c: designware_i2c: Restore enable state after set speed

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Before calling __dw_i2c_set_bus_speed(),
the I2C could already be set as ether enable or disable,
we should restore the original setting instead of enable i2c anyway.

This patch fix a bug happened in init function:
    __dw_i2c_init(){
            /* Disable i2c */
            ...
            __dw_i2c_set_bus_speed(i2c_base, NULL, speed);
            writel(slaveaddr, &i2c_base->ic_sar);
            /* Enable i2c */
    }
In this case, enable i2c inside __dw_i2c_set_bus_speed() function
will cause ic_sar write fail.

Signed-off-by: Jun Chen <ptchentw@gmail.com>
This commit is contained in:
Jun Chen 2019-06-05 15:23:16 +08:00 committed by Heiko Schocher
parent e5aee22e4b
commit e3b93dcee8
1 changed files with 7 additions and 2 deletions
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9
drivers/i2c/designware_i2c.c
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@ -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;
}