linux-kernel - Re: [PATCH v1 0/5] Enable fw

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Message-ID: <20201221161822.572e5cbe@xhacker.debian>
Date:   Mon, 21 Dec 2020 16:18:22 +0800
From:   Jisheng Zhang <Jisheng.Zhang@...aptics.com>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>, kernel-team@...roid.com,
        linux-kernel@...r.kernel.org, Kevin Hilman <khilman@...libre.com>,
        John Stultz <john.stultz@...aro.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Marc Zyngier <maz@...nel.org>
Subject: Re: [PATCH v1 0/5] Enable fw_devlink=on by default

On Thu, 17 Dec 2020 19:16:58 -0800 Saravana Kannan wrote:


> 
> 
> As discussed in LPC 2020, cyclic dependencies in firmware that couldn't
> be broken using logic was one of the last remaining reasons
> fw_devlink=on couldn't be set by default.
> 
> This series changes fw_devlink so that when a cyclic dependency is found
> in firmware, the links between those devices fallback to permissive mode
> behavior. This way, the rest of the system still benefits from
> fw_devlink, but the ambiguous cases fallback to permissive mode.
> 
> Setting fw_devlink=on by default brings a bunch of benefits (currently,
> only for systems with device tree firmware):
> * Significantly cuts down deferred probes.
> * Device probe is effectively attempted in graph order.
> * Makes it much easier to load drivers as modules without having to
>   worry about functional dependencies between modules (depmod is still
>   needed for symbol dependencies).
> 
> Greg/Rafael,
> 
> Can we get this pulled into 5.11-rc1 or -rc2 soon please? I expect to
> see some issues due to device drivers that aren't following best
> practices (they don't expose the device to driver core). Want to
> identify those early on and try to have them fixed before 5.11 release.
> See [1] for an example of such a case.
> 
> If we do end up have to revert anything, it'll just be Patch 5/5 (a one
> liner).
> 
> Marc,
> 
> You had hit issues with fw_devlink=on before on some of your systems.
> Want to give this a shot?
> 
> Jisheng,
> 
> Want to fix up one of those gpio drivers you were having problems with?
> 

Hi Saravana,

I didn't send fix for the gpio-dwapb.c in last development window, so can
send patch once 5.11-rc1 is released.

thanks