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From: "Rafael J. Wysocki" <rafael@kernel.org>
To: Rishabh Bhatnagar <rishabhb@codeaurora.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	ckadabi@codeaurora.org, tsoni@codeaurora.org,
	Vikram Mulukutla <markivx@codeaurora.org>
Subject: Re: [PATCH] dd: Invoke one probe retry cycle after every initcall level
Date: Tue, 24 Jul 2018 10:24:53 +0200
Message-ID: <CAJZ5v0ixuWo9RC21Z8zVhuHfkr1uV4vdqMh4s+qGMR7R8Wycag@mail.gmail.com> (raw)
In-Reply-To: <e4ca8572ed913ab65f63be8a351d4439@codeaurora.org>

On Mon, Jul 23, 2018 at 10:22 PM,  <rishabhb@codeaurora.org> wrote:
> On 2018-07-23 04:17, Rafael J. Wysocki wrote:
>>
>> On Thu, Jul 19, 2018 at 11:24 PM, Rishabh Bhatnagar
>> <rishabhb@codeaurora.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

  reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-19 21:24 Rishabh Bhatnagar
2018-07-23 11:17 ` Rafael J. Wysocki
2018-07-23 20:22   ` rishabhb
2018-07-24  8:24     ` Rafael J. Wysocki [this message]
2018-08-01 21:18       ` rishabhb
2018-08-01 21:21         ` Rafael J. Wysocki
     [not found]           ` <CA+tyz+6ZwtpKM=G5F2Do_sXWyo8r83ma19fWpn4HELiy0XT7=w@mail.gmail.com>
2018-08-02 22:20             ` Sodagudi Prasad
2018-08-06  8:53               ` Rafael J. Wysocki
2018-08-09 22:30                 ` rishabhb
2018-08-10  7:10                   ` Rafael J. Wysocki
2018-08-10 17:19                     ` Sodagudi Prasad

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