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[144.49.247.29]) by smtp-relay.gmail.com with ESMTPS id 98e67ed59e1d1-35e350bbd75sm608059a91.3.2026.04.10.10.00.15 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 10 Apr 2026 10:00:15 -0700 (PDT) X-Relaying-Domain: broadcom.com X-CFilter-Loop: Reflected Received: by mail-dy1-f198.google.com with SMTP id 5a478bee46e88-2bdf6fe90a9so3187747eec.1 for ; Fri, 10 Apr 2026 10:00:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1775840414; x=1776445214; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:autocrypt:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:from:to:cc:subject:date:message-id:reply-to; bh=4muxIAPUw94/gS1wtcjYpBOll/D/VUQFDQMiW/Xhw+g=; b=eFvEc984VNTWdyS3qNGt0es50/IA5eAQt7h4Bur427ePenhy0ngTG3vRzuj0RpBDWP +VutPASE2stYkGzQDMdvT6pDUEYu0SrSy2FWv8GSO5avDS0NLPNuKusoy3QcXIUXxliO AQyPiGABR8v3HSdD4rp8piisk+mMQXwDTij8o= X-Forwarded-Encrypted: i=1; AJvYcCVcyEJKC+YpLrZJdUOSDszkap5n+rsFRiTO7bbKAfVtM44lGVtnFZTCROJkhb+PUDGBbv8ZFkX0N7iYzg4=@vger.kernel.org X-Received: by 2002:a05:7300:7313:b0:2ba:6819:2e9b with SMTP id 5a478bee46e88-2d586699573mr2355098eec.3.1775840413449; Fri, 10 Apr 2026 10:00:13 -0700 (PDT) X-Received: by 2002:a05:7300:7313:b0:2ba:6819:2e9b with SMTP id 5a478bee46e88-2d586699573mr2355057eec.3.1775840412769; Fri, 10 Apr 2026 10:00:12 -0700 (PDT) Received: from [10.67.48.245] ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2d55f5c69casm5961297eec.2.2026.04.10.10.00.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 10 Apr 2026 10:00:10 -0700 (PDT) Message-ID: <8ee8ce9f-cf85-44d4-8a8c-ea78bea6ec69@broadcom.com> Date: Fri, 10 Apr 2026 10:00:08 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next] net: phy: call phy_init_hw() in phy resume path To: "Russell King (Oracle)" , Biju Cc: Andrew Lunn , Heiner Kallweit , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Ovidiu Panait , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven , Prabhakar Mahadev Lad , linux-renesas-soc@vger.kernel.org, Biju Das References: <20260410142904.439666-1-biju.das.jz@bp.renesas.com> Content-Language: en-US, fr-FR From: Florian Fainelli Autocrypt: addr=florian.fainelli@broadcom.com; keydata= xsBNBFPAG8ABCAC3EO02urEwipgbUNJ1r6oI2Vr/+uE389lSEShN2PmL3MVnzhViSAtrYxeT M0Txqn1tOWoIc4QUl6Ggqf5KP6FoRkCrgMMTnUAINsINYXK+3OLe7HjP10h2jDRX4Ajs4Ghs JrZOBru6rH0YrgAhr6O5gG7NE1jhly+EsOa2MpwOiXO4DE/YKZGuVe6Bh87WqmILs9KvnNrQ PcycQnYKTVpqE95d4M824M5cuRB6D1GrYovCsjA9uxo22kPdOoQRAu5gBBn3AdtALFyQj9DQ KQuc39/i/Kt6XLZ/RsBc6qLs+p+JnEuPJngTSfWvzGjpx0nkwCMi4yBb+xk7Hki4kEslABEB AAHNMEZsb3JpYW4gRmFpbmVsbGkgPGZsb3JpYW4uZmFpbmVsbGlAYnJvYWRjb20uY29tPsLB IQQQAQgAywUCZWl41AUJI+Jo+hcKAAG/SMv+fS3xUQWa0NryPuoRGjsA3SAUAAAAAAAWAAFr ZXktdXNhZ2UtbWFza0BwZ3AuY29tjDAUgAAAAAAgAAdwcmVmZXJyZWQtZW1haWwtZW5jb2Rp bmdAcGdwLmNvbXBncG1pbWUICwkIBwMCAQoFF4AAAAAZGGxkYXA6Ly9rZXlzLmJyb2FkY29t Lm5ldAUbAwAAAAMWAgEFHgEAAAAEFQgJChYhBNXZKpfnkVze1+R8aIExtcQpvGagAAoJEIEx tcQpvGagWPEH/2l0DNr9QkTwJUxOoP9wgHfmVhqc0ZlDsBFv91I3BbhGKI5UATbipKNqG13Z TsBrJHcrnCqnTRS+8n9/myOF0ng2A4YT0EJnayzHugXm+hrkO5O9UEPJ8a+0553VqyoFhHqA zjxj8fUu1px5cbb4R9G4UAySqyeLLeqnYLCKb4+GklGSBGsLMYvLmIDNYlkhMdnnzsSUAS61 WJYW6jjnzMwuKJ0ZHv7xZvSHyhIsFRiYiEs44kiYjbUUMcXor/uLEuTIazGrE3MahuGdjpT2 IOjoMiTsbMc0yfhHp6G/2E769oDXMVxCCbMVpA+LUtVIQEA+8Zr6mX0Yk4nDS7OiBlvOwE0E U8AbwQEIAKxr71oqe+0+MYCc7WafWEcpQHFUwvYLcdBoOnmJPxDwDRpvU5LhqSPvk/yJdh9k 4xUDQu3rm1qIW2I9Puk5n/Jz/lZsqGw8T13DKyu8eMcvaA/irm9lX9El27DPHy/0qsxmxVmU pu9y9S+BmaMb2CM9IuyxMWEl9ruWFS2jAWh/R8CrdnL6+zLk60R7XGzmSJqF09vYNlJ6Bdbs MWDXkYWWP5Ub1ZJGNJQ4qT7g8IN0qXxzLQsmz6tbgLMEHYBGx80bBF8AkdThd6SLhreCN7Uh IR/5NXGqotAZao2xlDpJLuOMQtoH9WVNuuxQQZHVd8if+yp6yRJ5DAmIUt5CCPcAEQEAAcLB gQQYAQIBKwUCU8AbwgUbDAAAAMBdIAQZAQgABgUCU8AbwQAKCRCTYAaomC8PVQ0VCACWk3n+ obFABEp5Rg6Qvspi9kWXcwCcfZV41OIYWhXMoc57ssjCand5noZi8bKg0bxw4qsg+9cNgZ3P N/DFWcNKcAT3Z2/4fTnJqdJS//YcEhlr8uGs+ZWFcqAPbteFCM4dGDRruo69IrHfyyQGx16s CcFlrN8vD066RKevFepb/ml7eYEdN5SRALyEdQMKeCSf3mectdoECEqdF/MWpfWIYQ1hEfdm C2Kztm+h3Nkt9ZQLqc3wsPJZmbD9T0c9Rphfypgw/SfTf2/CHoYVkKqwUIzI59itl5Lze+R5 wDByhWHx2Ud2R7SudmT9XK1e0x7W7a5z11Q6vrzuED5nQvkhAAoJEIExtcQpvGagugcIAJd5 EYe6KM6Y6RvI6TvHp+QgbU5dxvjqSiSvam0Ms3QrLidCtantcGT2Wz/2PlbZqkoJxMQc40rb fXa4xQSvJYj0GWpadrDJUvUu3LEsunDCxdWrmbmwGRKqZraV2oG7YEddmDqOe0Xm/NxeSobc MIlnaE6V0U8f5zNHB7Y46yJjjYT/Ds1TJo3pvwevDWPvv6rdBeV07D9s43frUS6xYd1uFxHC 7dZYWJjZmyUf5evr1W1gCgwLXG0PEi9n3qmz1lelQ8lSocmvxBKtMbX/OKhAfuP/iIwnTsww 95A2SaPiQZA51NywV8OFgsN0ITl2PlZ4Tp9hHERDe6nQCsNI/Us= In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e On 4/10/26 07:51, Russell King (Oracle) wrote: > On Fri, Apr 10, 2026 at 03:29:01PM +0100, Biju wrote: >> From: Ovidiu Panait >> >> When mac_managed_pm flag is set, mdio_bus_phy_resume() is skipped, so >> phy_init_hw(), which performs soft_reset and config_init, is not called >> during resume. >> >> This is inconsistent with the non-mac_managed_pm path, where >> mdio_bus_phy_resume() calls phy_init_hw() before phy_resume() on every >> resume. >> >> To align both paths, add a phy_init_hw() call at the top of >> __phy_resume(), before invoking the driver's resume callback. This >> guarantees the PHY undergoes soft reset and re-initialization regardless >> of whether PM is managed by the MAC or the MDIO bus. >> >> Signed-off-by: Ovidiu Panait >> Signed-off-by: Biju Das >> --- >> drivers/net/phy/phy_device.c | 4 ++++ >> 1 file changed, 4 insertions(+) >> >> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c >> index 0edff47478c2..8255f4208d66 100644 >> --- a/drivers/net/phy/phy_device.c >> +++ b/drivers/net/phy/phy_device.c >> @@ -2008,6 +2008,10 @@ int __phy_resume(struct phy_device *phydev) >> if (!phydrv || !phydrv->resume) >> return 0; >> >> + ret = phy_init_hw(phydev); >> + if (ret) >> + return ret; > > Do we want to do this even when phydrv->resume is NULL? Seems to me we would want that, but this gets into the territory of potentially creating many soft-reset of the PHYs, something that I regret having introduced years ago. > > Apart from that, looks fine to me - it seems some paths call > phy_init_hw() can be called with or without phydev->lock held, and > this one will call it with the lock held which seems to be okay. > Agreed. -- Florian