From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5FFFCCD98C7 for ; Wed, 10 Jun 2026 19:40:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:References: List-Owner; bh=hU4IFAsCcxyohAC1uRq1LnazIL9Yv+87ae0nhmv5w/w=; b=l62gvTNfg0Xkih 02ymhgThQ/aUFSazXv9f8/H25LiY7G0q+7Ts0QaxJa6jn2eMTtRAHV9Y0hbH+VX6cP7s2DNSpoEnO 0zJzhT6+P6lzrCKFTsO6x/BOPft8mA1SNgGEGjXkd61QMEZ2vy8NtFUqyzwCRofKlJvY3jpC+mo1/ EAuwDd4+wpXjReMFSI5uizUu49xAh39V7QMCKBsUrTmZ06kTzjUqXnL/xu01uG7M5K83/OLpUoE6j ZWEbjdD5vHoihHBj8hJE8Tc0gFR6XOMbva1Yb3plh/sbddhstdm27JSxb4iJn5JSnnKMLO7xHRBVM TMgfSwT520iE8TFwXI8A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wXOmd-00000008H7T-00Eo; Wed, 10 Jun 2026 19:40:15 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wXOma-00000008H7F-2rQO; Wed, 10 Jun 2026 19:40:12 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 971CB4189E; Wed, 10 Jun 2026 19:40:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 46B231F00893; Wed, 10 Jun 2026 19:40:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1781120411; bh=hU4IFAsCcxyohAC1uRq1LnazIL9Yv+87ae0nhmv5w/w=; h=Date:From:To:Cc:Subject:In-Reply-To; b=fuMIkcdDIet4CZe8638VWQL4JFeHHAUP8aGPm0y/OUNfRu7oRuyobu308+m4CWYby x04kSR8CWKYXUWx9EKINlOlOBAjtE++to2622W6NiU+kKWW6WzRf2mRNNawRVMRoQJ FRiQTfjW8awttH9aBnO6ievQxb49J78gbdbWvuvkzuPFdI04MSC/zjJnAg6qt6YW9K ymHozcyl9AV43dbS/J23W7nCAn/XWAE51nq+OQGMKEa2j+Q49WTrBzOOPITBafgc8I XUyaJKvlZ25QbHDhbTyQgA8T1VSJw7H8tuMvOA/nZWEsyitKi8cYdcuZcAGmribmhl Y4AaIXlbT/2OA== Date: Wed, 10 Jun 2026 14:40:10 -0500 From: Bjorn Helgaas To: Jose Ignacio Tornos Martinez Cc: bhelgaas@google.com, alex@shazbot.org, jjohnson@kernel.org, mani@kernel.org, linux-pci@vger.kernel.org, linux-wireless@vger.kernel.org, ath11k@lists.infradead.org, ath12k@lists.infradead.org, mhi@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH v8 3/3] PCI: Disable broken bus reset on Qualcomm devices Message-ID: <20260610194010.GA376413@bhelgaas> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260609163649.319755-4-jtornosm@redhat.com> X-BeenThere: ath12k@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "ath12k" Errors-To: ath12k-bounces+ath12k=archiver.kernel.org@lists.infradead.org On Tue, Jun 09, 2026 at 06:36:49PM +0200, Jose Ignacio Tornos Martinez wrote: > Some Qualcomm PCIe devices (WCN6855/WCN7850 WiFi cards, SDX62/SDX65 modems) > do not properly support Secondary Bus Reset (SBR). > > Testing confirms this is device-specific, not deployment-specific: > MediaTek MT7925e successfully uses bus reset through the same passive > M.2-to-PCIe adapters where Qualcomm devices fail, proving PERST# is > properly wired through the adapters. > > This quirk acts as a safety net, preventing the broken bus reset from being > attempted if users override reset methods (device_specific or d3cold when > available) via sysfs. > > Signed-off-by: Jose Ignacio Tornos Martinez Applied this patch (3/3 only) to pci/virtualization for v7.2, thanks! It looks like the D3cold parts are still being ironed out. > --- > v8: code unchanged from v7 > v7: https://lore.kernel.org/all/20260603105853.326290-4-jtornosm@redhat.com/ > > drivers/pci/quirks.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c > index 000000000000..111111111111 100644 > --- a/drivers/pci/quirks.c > +++ b/drivers/pci/quirks.c > @@ -3789,6 +3789,9 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0030, quirk_no_bus_reset); > DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0032, quirk_no_bus_reset); > DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x003c, quirk_no_bus_reset); > DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0033, quirk_no_bus_reset); > DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0034, quirk_no_bus_reset); > DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x003e, quirk_no_bus_reset); > +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_QCOM, 0x1103, quirk_no_bus_reset); /* WCN6855 */ > +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_QCOM, 0x1107, quirk_no_bus_reset); /* WCN7850 */ > +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_QCOM, 0x0308, quirk_no_bus_reset); /* SDX62/SDX65 */ > > /* > * Root port on some Cavium CN8xxx chips do not successfully complete a bus > -- > 2.53.0 >