Hello Chang-Ming, chang-ming.hu...@freescale.com wrote: > From: Jerry Huang <chang-ming.hu...@freescale.com> > > It is sometimes necessary to force the I2C module to become the I2C bus master > out of reset and drive SCL(even though SDA may already be driven, > which indicates that the bus is busy). This can occur when a system reset > does not cause all I2C devices to be reset. Thus, SDA can be driven low > by another I2C device while this I2C module is coming out of reset > and stays low indefinitely. The following procedure can be used to > force this I2C module to generate SCL so that the device driving SDA > can finish its transaction. > > Signed-off-by: Jerry Huang <chang-ming.hu...@freescale.com> > --- > drivers/i2c/fsl_i2c.c | 18 ++++++++++++++++++ > 1 files changed, 18 insertions(+), 0 deletions(-) > > diff --git a/drivers/i2c/fsl_i2c.c b/drivers/i2c/fsl_i2c.c > index 258be0a..007db70 100644 > --- a/drivers/i2c/fsl_i2c.c > +++ b/drivers/i2c/fsl_i2c.c > @@ -252,6 +252,24 @@ i2c_init(int speed, int slaveadd) > writeb(slaveadd << 1, &dev->adr);/* write slave address */ > writeb(0x0, &dev->sr); /* clear status register */ > writeb(I2C_CR_MEN, &dev->cr); /* start I2C controller */ > + > + /* Force I2C module to become bus master which can occure when > + * a system reset does not cause all I2C devices to be reset */
Checkpatch doesn't warn, but wrong comment style here, please change. [...] bye, Heiko -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
