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i2c-imx: wait for STOP before disabling controller 

Makes sure that the STOP condition is transmitted before the I2C
controller is disabled.
This fixes a problem where writing to an external EEPROM was not working
because the EEPROM waits until the STOP before initiating the write
internally.

Signed-off-by: Marc Reilly <marc@cpdesign.com.au>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Marc Reilly 2010-10-01 14:30:59 +10:00 committed by Sascha Hauer
parent 056dd7906f
commit b82ee742d0
1 changed files with 5 additions and 5 deletions
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10
drivers/i2c/busses/i2c-imx.c
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@ -265,7 +265,9 @@ static void i2c_imx_stop(struct i2c_adapter *adapter)
temp = readb(base + IMX_I2C_I2CR);
temp &= ~(I2CR_MSTA | I2CR_MTX);
writeb(temp, base + IMX_I2C_I2CR);
i2c_imx->stopped = 1;
/* wait for the stop condition to be send, otherwise the i2c
* controller is disabled before the STOP is sent completely */
i2c_imx->stopped = i2c_imx_bus_busy(adapter, 0) ? 0 : 1;
}
if (cpu_is_mx1()) {
/*
@ -275,11 +277,9 @@ static void i2c_imx_stop(struct i2c_adapter *adapter)
udelay(i2c_imx->disable_delay);
}
if (!i2c_imx->stopped)
i2c_imx_bus_busy(adapter, 0);
/* Disable I2C controller */
/* Disable I2C controller, and force our state to stopped */
writeb(0, base + IMX_I2C_I2CR);
i2c_imx->stopped = 1;
}
static void i2c_imx_set_clk(struct imx_i2c_struct *i2c_imx,