Re: I2C writes with interrupts disabled

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On Tue, Jul 31, 2018 at 12:09 PM, Wolfram Sang <wsa@xxxxxxxxxxxxx> wrote:
>
>> After this happens we try to shutdown the PMIC that interact over I2C.
>> I2C writes will need I2C interrupts to be enabled but in an interrupt
>> disabled context if shutting PMIC is the last thing in the sequence
>> which needs I2C writes is there an already existing solution to this
>> scenario? Any pointers would help.
>
> No existing solution. Long standing, known problem.
>
> IIRC the latest design we discussed is to add a new callback to struct
> i2c_algorithm like 'master_xfer_irqless' and teach the I2C core when to
> call which callback. Which might not be so super straightforward because
> for most drivers (except PMICs probably) using I2C when interrupts are
> disabled is a bug and we also shouldn't hide that by providing a generic
> fallback.

Perhaps we should call it like i2c_pmic_xfer() to deliberately show
that this is dedicated solely for PMICs?

-- 
With Best Regards,
Andy Shevchenko



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