Hi Peter, On 02/27/2014 02:56 PM, Peter Ujfalusi wrote: > Hi, > > While looking into a report by Florian Vaussard [1] I have noticed couple of > most > likely unrelated issues: > - all boards using twl6040 configures the i2c bus to 400KHz while twl6040 is > set > to 100KHz as default. > - if I set the audpwron GPIO high [2] in the bootloader the i2c communication > towards > twl6040 will be broken > > The solution or these are: > set the twl6040 to i2c fast mode with regmap patch > Clear the INTID register right after we request the audpwron GPIO and set it > to > low. > > Generated on top of: > git://git.linaro.org/people/lee.jones/mfd.git for-mfd-next > > Tested on PandaBoard, PandaBoardES, OMAP4-blaze (SDP) > > [1] http://www.spinics.net/lists/arm-kernel/msg310725.html > [2] Command in u-boot to enable the audpwron on PandaBoards: gpio set 127 > > Regards, > Peter > --- > Peter Ujfalusi (3): > mfd: twl6040: Select i2c fast mode as default with regmap patch > mfd: twl6040: Move register patching earlier in probe > mfd: twl6040: Clear the interrupt ID register before requesting IRQ
Patch 3 is making my system to boot normally. Now, it is hard to devise if this is the root cause of the problem that I was experiencing, since adding a sleep at the exact same place was fixing my issue. Your twl6040_reg_read() could have the same effect, without solving directly the issue. Anyway, I tested your series on DuoVero. Tested-by: Florian Vaussard <[email protected]> Regards, Florian -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
