netdev - Re: RTL8402 stops working after hibernate/resume

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Date:   Fri, 25 Sep 2020 14:56:08 +0200
From:   Petr Tesarik <ptesarik@...e.cz>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        netdev@...r.kernel.org
Subject: Re: RTL8402 stops working after hibernate/resume

On Fri, 25 Sep 2020 11:52:41 +0200
Petr Tesarik <ptesarik@...e.cz> wrote:

> On Fri, 25 Sep 2020 11:44:09 +0200
> Heiner Kallweit <hkallweit1@...il.com> wrote:
> 
> > On 25.09.2020 10:54, Petr Tesarik wrote:  
>[...]
> > > Does it make sense to bisect the change that broke the driver for me, or should I rather dispose of this waste^Wlaptop in an environmentally friendly manner? I mean, would you eventually accept a workaround for a few machines with a broken BIOS?
> > >     
> > If the workaround is small and there's little chance to break other stuff: then usually yes.
> > If you can spend the effort to bisect the issue, this would be appreciated.  
> 
> OK, then I'm going to give it a try.

Done. The system freezes when this commit is applied:

commit 9f0b54cd167219266bd3864570ae8f4987b57520
Author: Heiner Kallweit <hkallweit1@...il.com>
Date:   Wed Jun 17 22:55:40 2020 +0200

    r8169: move switching optional clock on/off to pll power functions
    
    Relevant chip clocks are disabled in rtl_pll_power_down(), therefore
    move calling clk_disable_unprepare() there. Similar for enabling the
    clock.
    
    Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
    Signed-off-by: David S. Miller <davem@...emloft.net>

I cannot be sure this is related to the malfunction after resume reported earlier, but it again touches the suspend/resume path...

Anything else I should try?

Petr T

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