linux-kernel - Re: [PATCH] net: stmmac: dwmac-rk: fix unbalanced pm_runtime

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Message-ID: <CAGb2v67Duk_56fOKVwZsYn2HKJ99o8WJ+d4jetD2UjDsAt9BcA@mail.gmail.com>
Date:   Mon, 30 Aug 2021 01:48:19 +0800
From:   Chen-Yu Tsai <wens@...nel.org>
To:     Michael Riesch <michael.riesch@...fvision.net>
Cc:     netdev <netdev@...r.kernel.org>,
        "moderated list:ARM/STM32 ARCHITECTURE" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>
Subject: Re: [PATCH] net: stmmac: dwmac-rk: fix unbalanced pm_runtime_enable warnings

Hi,

On Mon, Aug 23, 2021 at 10:39 PM Michael Riesch
<michael.riesch@...fvision.net> wrote:
>
> This reverts commit 2c896fb02e7f65299646f295a007bda043e0f382
> "net: stmmac: dwmac-rk: add pd_gmac support for rk3399" and fixes
> unbalanced pm_runtime_enable warnings.
>
> In the commit to be reverted, support for power management was
> introduced to the Rockchip glue code. Later, power management support
> was introduced to the stmmac core code, resulting in multiple
> invocations of pm_runtime_{enable,disable,get_sync,put_sync}.
>
> The multiple invocations happen in rk_gmac_powerup and
> stmmac_{dvr_probe, resume} as well as in rk_gmac_powerdown and
> stmmac_{dvr_remove, suspend}, respectively, which are always called
> in conjunction.
>
> Signed-off-by: Michael Riesch <michael.riesch@...fvision.net>

I just found that Ethernet stopped working on my RK3399 devices,
and I bisected it down to this patch.

The symptom I see is no DHCP responses, either because the request
isn't getting sent over the wire, or the response isn't getting
received. The PHY seems to be working correctly.


ChenYu