From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 794D59463 for ; Tue, 2 Jun 2026 16:01:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780416062; cv=none; b=fR4iUzo8YeKErcOBnrY0gck/qk7PAVMlFGQ1YJdVsAeKyfqo9ISbdMQpTErm3DVZVd+85DH23GMMi6YO9MXx7NFJ57ZqlnKQYG5XZ/FKggcwk4gi4xU9J/7BexYxyeQMxSuaOQU6PLwgC/TWdMX1t9mNCHbSbrmhd4fclxPBWCw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780416062; c=relaxed/simple; bh=X8LfJRRyM9dmOoOOb2mWEz0vr0fXvVv70ydCa+gf9sA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LgdVEtoULH5f12MysHLO2PJt3Stxhwh0ZD+fGX9xVmQh4J0rGZLLJ7s2DLdBusQNqdWyU7EYvN6YFs1B6qCtgHUtqa6qRLx3p8cacn+3zkSSqCngcs+xQ8rMekqfru7QGVuYKpVXUbUp/ceRNcBS/6E7Zj0lKbifUzlSIm0cU80= 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=HVyUaCPW; arc=none smtp.client-ip=170.10.133.124 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="HVyUaCPW" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1780416060; 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=W7lhxXhmw63vVneHWPJnRnLBBsQzjvsFQ841tAfawJk=; b=HVyUaCPW7b6isiMXM7G09STjSyQfKnup33mDZ2RxF01XP4UczPY0O42Xxt310tSgiFOil5 N8eSLMR2wA/vP2oofTDD3kbv5J1zu3r5knJykNj+OQ2LtGPFsexsM2ZL2wQNQFddizCBQK /YxR64+g1PHQ8d7vhS8SbD+MlDg3Bes= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-454-4xXEZffvO5aYmkMZnahdfQ-1; Tue, 02 Jun 2026 12:00:57 -0400 X-MC-Unique: 4xXEZffvO5aYmkMZnahdfQ-1 X-Mimecast-MFC-AGG-ID: 4xXEZffvO5aYmkMZnahdfQ_1780416055 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-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 2E93F1955F1A; Tue, 2 Jun 2026 16:00:55 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.44.48.109]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 53BBA1953947; Tue, 2 Jun 2026 16:00:51 +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 v6 3/3] PCI: Disable broken bus reset on Qualcomm devices Date: Tue, 2 Jun 2026 18:00:24 +0200 Message-ID: <20260602160024.1171949-4-jtornosm@redhat.com> In-Reply-To: <20260602160024.1171949-1-jtornosm@redhat.com> References: <20260602160024.1171949-1-jtornosm@redhat.com> Precedence: bulk X-Mailing-List: linux-wireless@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 (ath11k WiFi, ath12k WiFi, 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 --- v6: code unchanged from v5 v5: https://lore.kernel.org/all/20260521130512.515125-4-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); /* ath11k */ +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_QCOM, 0x1107, quirk_no_bus_reset); /* ath12k */ +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