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[144.49.247.120]) by smtp-relay.gmail.com with ESMTPS id 98e67ed59e1d1-3ab369147b5sm6007236a91.0.2026.10.12.14.41.41 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 12 Oct 2026 14:41:42 -0700 (PDT) X-Relaying-Domain: broadcom.com X-CFilter-Loop: Reflected Received: by mail-dy1-f198.google.com with SMTP id 5a478bee46e88-3510d0baf63so6550139eec.1 for ; Mon, 12 Oct 2026 14:41:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1791841301; x=1792446101; darn=vger.kernel.org; h=content-transfer-encoding:content-type: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 :content-type; bh=7fRjyjPaygPyac6Q2934hJ/KUw5dbvEUBwLV/bpzblk=; b=QxeOyTzVDZJ/1+vQKNsMOWgr3H/A2RrBunnSsoR4vdFbgG/F5b231KgB2bEfuSYmZ6 4CJ94CjB+R32Nl2qwZ0kGbj7YqxAvf2BBOz32ht3+PN2vlPkGJP7IEODpvDXCBMJdkLZ 6g8ScM47S4NZVRmh8VRWHlgvCHBJ1/ZGmnjsE= X-Forwarded-Encrypted: i=1; AKwUvBwQ0ahNVQEX5cL9fnFD3M0F0iTYUOmk0lLlmOB/u6/XuRMJ8ypa9YT9fZVJ8o1apoYpzK/xAjANXsPOa/s=@vger.kernel.org X-Received: by 2002:a05:7301:618f:10b0:359:8492:20ff with SMTP id 5a478bee46e88-35984922299mr8367833eec.12.1791841300618; Mon, 12 Oct 2026 14:41:40 -0700 (PDT) X-Received: by 2002:a05:7301:618f:10b0:359:8492:20ff with SMTP id 5a478bee46e88-35984922299mr8367798eec.12.1791841300003; Mon, 12 Oct 2026 14:41:40 -0700 (PDT) Received: from [10.67.48.245] ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-353814b556esm41603546eec.18.2026.10.12.14.41.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 12 Oct 2026 14:41:39 -0700 (PDT) Message-ID: <1e813008-1874-4164-a803-b1af26332d35@broadcom.com> Date: Mon, 12 Oct 2026 14:41:37 -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] PCI: Avoid D3 on PLX PEX 8532/8533/8548 downstream ports To: Bjorn Helgaas , Imre Kaloz Cc: Bjorn Helgaas , linux-pci@vger.kernel.org, Andreas Larsson , sparclinux@vger.kernel.org, "David S. Miller" , linux-kernel@vger.kernel.org, stable@vger.kernel.org, Shivasharan S , Srinath Mannam , Michael Chan , Vikas Gupta References: <20261012213447.GA1392402@bhelgaas> 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: <20261012213447.GA1392402@bhelgaas> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e On 10/12/26 14:34, Bjorn Helgaas wrote: > [+cc several Broadcom folks, help with possible switch erratum] > > On Sun, Sep 27, 2026 at 12:56:09PM +0200, Imre Kaloz wrote: >> Runtime PM suspends an idle downstream port of a PLX/Broadcom PEX >> 8532/8533/8548 switch to D3hot, but that takes the whole switch down >> with it: any device behind another port of the same switch then >> faults with a fatal bus error on its next access, e.g. mptsas probe >> on a Sun Ultra 45. >> >> This surfaced on sparc64 once commit a5fb3ff63287 ("PCI: Allow PCI >> bridges to go to D3Hot on all non-x86") let bridges enter D3hot. Keep >> these downstream ports out of D3 by setting PCI_DEV_FLAGS_NO_D3. > > I don't really have any objection to this, but I am concerned that > this quirk only applies to a few specific devices, but > https://admin.pci-ids.ucw.cz/read/PC/10b5 shows a TON of > similar-looking switches that I assume have the same behavior, so > this may be just the tip of the iceberg. > >> Fixes: a5fb3ff63287 ("PCI: Allow PCI bridges to go to D3Hot on all non-x86") >> Cc: stable@vger.kernel.org >> Signed-off-by: Imre Kaloz Our internal portal does not have any document for the 8532/8533/8548 so unfortunately I cannot help here with identifying an errata document. -- Florian