From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F399443E48B for ; Wed, 3 Jun 2026 10:59:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780484369; cv=none; b=qoyJCsR7l+mUiAAuld7T3O2aYKOIBT56nKtw+sYgzlzAD/p2QtMs3H/wAsAC/Wkw23RbK0Yp21Vq86XrnE286KRoVVYRAU7+keG5rycJVRKR32XOz+XC7NjdK3yqD000FF5ZHHGP0MdLi8ghmAGb0L2eFPBkh2v1Q5b7eADulEs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780484369; c=relaxed/simple; bh=L3Jdr9zTMk5w62f8RZI5ycLB+ZJKY7o+2/iVui+gdw8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QnKEGE8roXjAtKDqWXrAeJNuB6rSHMQ6DjuYjDq+JlV9oqVG2F32hoJiarTtpWZLeQlCx3tEOVt2VbxYfNcFcrtOE249/hlnhA5QyFD/pSH6jPn1OCYhgPt73K0lQlI/m5BGt26NWolhpdixHQh8lL4zg9rHvflYyCcVnp3Wh1c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=BtnvWVSM; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="BtnvWVSM" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1780484367; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=bEIpI5UUbeeTmfMn6Fr/4J/TUJu4+0oPS+MQRpTIvRU=; b=BtnvWVSMu10502NarybxDcWmmXkltgEkGETibtJ0mLA7D9DBfONkIZu8HLGLRvgXmKL/+4 whtA7Cv2oFUsNKG2oVXe/m73/Fi0JlzMYdJC3du/GNY+xUs2/7/FGGqq7hWuzaUNiBI8OP TQLntpWrQQZLKfLCvydfD2CEBslvARs= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-659-PUfFB2SnOdiqVZzE7BNLTg-1; Wed, 03 Jun 2026 06:59:24 -0400 X-MC-Unique: PUfFB2SnOdiqVZzE7BNLTg-1 X-Mimecast-MFC-AGG-ID: PUfFB2SnOdiqVZzE7BNLTg_1780484362 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 74FA21800370; Wed, 3 Jun 2026 10:59:22 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.44.48.81]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 6C7B41956095; Wed, 3 Jun 2026 10:59:18 +0000 (UTC) From: Jose Ignacio Tornos Martinez To: bhelgaas@google.com, alex@shazbot.org Cc: 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, Jose Ignacio Tornos Martinez Subject: [PATCH v7 3/3] PCI: Disable broken bus reset on Qualcomm devices Date: Wed, 3 Jun 2026 12:58:53 +0200 Message-ID: <20260603105853.326290-4-jtornosm@redhat.com> In-Reply-To: <20260603105853.326290-1-jtornosm@redhat.com> References: <20260603105853.326290-1-jtornosm@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 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 --- v7: Address the comments from Jeff Johnson: the problem was detected for the specific devices WCN6855 and WCN7850, use the name of the devices instead of the related drivers ath11k and ath12k, which support a large number of devices v6: https://lore.kernel.org/all/20260602160024.1171949-4-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