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Date:   Sat, 16 Jan 2021 16:59:14 -0800
From:   Jakub Kicinski <kuba@kernel.org>
To:     Jan Kiszka <jan.kiszka@siemens.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Wong Vee Khee <vee.khee.wong@intel.com>,
        Giuseppe Cavallaro <peppe.cavallaro@st.com>,
        Alexandre Torgue <alexandre.torgue@st.com>,
        Jose Abreu <joabreu@synopsys.com>,
        "David S . Miller" <davem@davemloft.net>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Ong Boon Leong <boon.leong.ong@intel.com>,
        Voon Wei Feng <weifeng.voon@intel.com>,
        stable@vger.kernel.org
Subject: Re: [PATCH net-next 1/1] stmmac: intel: change all EHL/TGL to auto
 detect phy addr
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References: <20201106094341.4241-1-vee.khee.wong@intel.com>
        <bf5170d1-62a9-b2dc-cb5a-d568830c947a@siemens.com>
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On Sat, 16 Jan 2021 10:12:21 +0100 Jan Kiszka wrote:
> On 06.11.20 10:43, Wong Vee Khee wrote:
> > From: Voon Weifeng <weifeng.voon@intel.com>
> > 
> > Set all EHL/TGL phy_addr to -1 so that the driver will automatically
> > detect it at run-time by probing all the possible 32 addresses.
> > 
> > Signed-off-by: Voon Weifeng <weifeng.voon@intel.com>
> > Signed-off-by: Wong Vee Khee <vee.khee.wong@intel.com>
> 
> This fixes PHY detection on one of our EHL-based boards. Can this also
> be applied to stable 5.10?

Sure.

Greg, we'd like to request a backport of the following commit to 5.10.

commit bff6f1db91e330d7fba56f815cdbc412c75fe163
Author: Voon Weifeng <weifeng.voon@intel.com>
Date:   Fri Nov 6 17:43:41 2020 +0800

    stmmac: intel: change all EHL/TGL to auto detect phy addr
    
    Set all EHL/TGL phy_addr to -1 so that the driver will automatically
    detect it at run-time by probing all the possible 32 addresses.
    
    Signed-off-by: Voon Weifeng <weifeng.voon@intel.com>
    Signed-off-by: Wong Vee Khee <vee.khee.wong@intel.com>
    Link: https://lore.kernel.org/r/20201106094341.4241-1-vee.khee.wong@intel.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>


It's relatively small, and Jan reports it makes his boards detect the
PHY. The change went in via -next and into Linus's tree during the 5.11
merge window.