linux-kernel - Re: [PATCH] dd: Invoke one probe retry cycle after every initcall level

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Date:   Tue, 24 Jul 2018 10:24:53 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Rishabh Bhatnagar <rishabhb@...eaurora.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ckadabi@...eaurora.org, tsoni@...eaurora.org,
        Vikram Mulukutla <markivx@...eaurora.org>
Subject: Re: [PATCH] dd: Invoke one probe retry cycle after every initcall level

On Mon, Jul 23, 2018 at 10:22 PM,  <rishabhb@...eaurora.org> wrote:
> On 2018-07-23 04:17, Rafael J. Wysocki wrote:
>>
>> On Thu, Jul 19, 2018 at 11:24 PM, Rishabh Bhatnagar
>> <rishabhb@...eaurora.org> wrote:
>>>
>>> Drivers that are registered at an initcall level may have to
>>> wait until late_init before the probe deferral mechanism can
>>> retry their probe functions. It is possible that their
>>> dependencies were resolved much earlier, in some cases even
>>> before the next initcall level. Invoke one probe retry cycle
>>> at every _sync initcall level, allowing these drivers to be
>>> probed earlier.
>>
>>
>> Can you please say something about the actual use case this is
>> expected to address?
>
> We have a display driver that depends 3 other devices to be
> probed so that it can bring-up the display. Because of dependencies
> not being met the deferral mechanism defers the probes for a later time,
> even though the dependencies might be met earlier. With this change
> display can be brought up much earlier.

OK

What runlevel brings up the display after the change?

Thanks,
Rafael