Messages in this thread | | | Date | Mon, 26 Nov 2012 00:14:07 +0100 | From | Samuel Ortiz <> | Subject | Re: [Patch v1 1/1] mfd: fix for i2c issue DA9052/53 PMIC |
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Hi Ashish,
On Fri, Nov 02, 2012 at 04:17:26PM +0530, Ashish Jangam wrote: > There is an issue where the DA9052/53-AA/BA/BB PMIC either locks up or fails to > respond following a system Reset. This could result in a second write > in which the bus writes the current content of the write buffer to address > of the last I2C access. > > The failure case is where this unwanted write transfers incorrect data to > a critical register. > > This patch fixes this issue by following any read or write with a dummy read > to a safe register address. A safe register address is one where the contents > will not affect the operation of the system. > > Signed-off-by: David Dajun Chen <dchen@diasemi.com> > Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com> > --- > drivers/mfd/da9052-i2c.c | 56 +++++++++++++++++++++++++++++++++++++ > include/linux/mfd/da9052/da9052.h | 47 ++++++++++++++++++++++++++++-- > include/linux/mfd/da9052/reg.h | 3 ++ > 3 files changed, 102 insertions(+), 4 deletions(-) Applied to my for-linus branch.
Cheers, Samuel.
-- Intel Open Source Technology Centre http://oss.intel.com/
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