Re: [RFC][PATCH] PM / Domains: Return -EPROBE_DEFER if we fail to init or turn-on domain

[Jon Hunter <jonathanh@nvidia.com>]

On 13/07/15 14:06, Jon Hunter wrote:
> 
> On 24/06/15 11:18, Ulf Hansson wrote:
>> On 18 June 2015 at 19:52, Jon Hunter <jonathanh@nvidia.com> wrote:
>>> When a device is probed, the function dev_pm_domain_attach() is called
>>> to see if there is a power-domain that is associated with the device and
>>> needs to be turned on. If dev_pm_domain_attach() does not return
>>> -EPROBE_DEFER then the device will be probed.
>>>
>>> For devices using genpd, dev_pm_domain_attach() will call
>>> genpd_dev_pm_attach(). If genpd_dev_pm_attach() does not find a power
>>> domain associated with the device then it returns an error code not
>>> equal to -EPROBE_DEFER to allow the device to be probed. However, if
>>> genpd_dev_pm_attach() does find a power-domain that is associated with
>>> the device, then it does not return -EPROBE_DEFER on failure and hence
>>> the device will still be probed. Furthermore, genpd_dev_pm_attach() does
>>> not check the error code returned by pm_genpd_poweron() to see if the
>>> power-domain was turned on successfully.
>>>
>>> Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
>>
>> This is a clear improvement for genpd and as a short-term solution I
>> am fine with this!
>>
>> The long term solution should be to implement the
>> pm_domain->activate|dismiss() callbacks, but that requires a bigger
>> effort.
>>
>> Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
> 
> Thanks Ulf.
> 
> Kevin, Rafael, are you ok with this?

I have still not heard back about this.

Ulf, not sure if you can help here.

Cheers
Jon

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