linux-kernel - Re: [RFC PATCH v1] driver core: Set fw_devlink to "permissive" behavior by default

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Message-ID: <20200327152144.GA2996253@kroah.com>
Date:   Fri, 27 Mar 2020 16:21:44 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     Saravana Kannan <saravanak@...gle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree@...r.kernel.org, kernel-team@...roid.com,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v1] driver core: Set fw_devlink to "permissive"
 behavior by default

On Fri, Mar 27, 2020 at 11:25:48AM +0100, Marek Szyprowski wrote:
> Hi,
> 
> On 2020-03-21 22:03, Saravana Kannan wrote:
> > Set fw_devlink to "permissive" behavior by default so that device links
> > are automatically created (with DL_FLAG_SYNC_STATE_ONLY) by scanning the
> > firmware.
> >
> > This ensures suppliers get their sync_state() calls only after all their
> > consumers have probed successfully. Without this, suppliers will get
> > their sync_state() calls at late_initcall_sync() even if their consuer
> >
> > Ideally, we'd want to set fw_devlink to "on" or "rpm" by default. But
> > that needs more testing as it's known to break some corner case
> > drivers/platforms.
> >
> > Cc: Rob Herring <robh+dt@...nel.org>
> > Cc: Frank Rowand <frowand.list@...il.com>
> > Cc: devicetree@...r.kernel.org
> > Signed-off-by: Saravana Kannan <saravanak@...gle.com>
> 
> This patch has just landed in linux-next 20200326. Sadly it breaks 
> booting of the Raspberry Pi3b and Pi4 boards, either in 32bit or 64bit 
> mode. There is no warning nor panic message, just a silent freeze. The 
> last message shown on the earlycon is:
> 
> [    0.893217] Serial: 8250/16550 driver, 1 ports, IRQ sharing enabled

I've just reverted this for now.

thanks,

greg k-h