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 B95CF47ECE6 for ; Tue, 9 Jun 2026 16:37:31 +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=1781023053; cv=none; b=Mf4iQ4+3LiwuYPeKvLcc5wOkLtH23d4EKDm6wexKG+NAbJSrCg13bThV2rtYYLNdW2TTGOStBmtDZ7Lk5JswwMsTHHi9cqux/BKGwJxQiNsM6CD2LEnmJvc/YjIx0hgZemC2MbJfyrjo4oQi7zUjCmjJL3ndkXhmwAz5DdzAhfc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781023053; c=relaxed/simple; bh=koDhQnTHKJ+v0eTO9QzSKdnaMX7L/wzR9sJrVKnJcKQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CZiB+8qbPGJsA5tsSLoet8N8D0owH1GZAi0fycVzAYBXv9U4VIuctU/KzQNsy9abPk5WCcucc4ys6JWCR+cGfhDSUl66LkD3gMM3OxtKgRn84X5tS6Ft6T56RbdXIdLjcly2EZDk/ihm+idSzVITanfpQf3Dg0t054dlEYHNM5Y= 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=ALK3uFl4; 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="ALK3uFl4" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1781023050; 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=yNPShK3Woy5WMT8W9QOvEiCBBwIllxtHV+VvB5QtD9w=; b=ALK3uFl4pj882vN8+PWSLwp+r7hE0+lbUzo1oJL9NluroG9wcSn4yiq3X2b6BlJUGExSJN s+5rgtcwwz//zfohxklgKA8irgscYgBouqhOqsRQ9gJr+x4Um5lpRVwO+3ZKA/1HYk69hm 11P62//Vv3Blnwbs9VF6gaJNymxOphE= Received: from mx-prod-mc-01.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-68-fWQzA6GMOYCOx6xgw1VLcw-1; Tue, 09 Jun 2026 12:37:26 -0400 X-MC-Unique: fWQzA6GMOYCOx6xgw1VLcw-1 X-Mimecast-MFC-AGG-ID: fWQzA6GMOYCOx6xgw1VLcw_1781023044 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (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-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id A13B21955F08; Tue, 9 Jun 2026 16:37:24 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.44.32.77]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 471741800662; Tue, 9 Jun 2026 16:37:21 +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 v8 3/3] PCI: Disable broken bus reset on Qualcomm devices Date: Tue, 9 Jun 2026 18:36:49 +0200 Message-ID: <20260609163649.319755-4-jtornosm@redhat.com> In-Reply-To: <20260609163649.319755-1-jtornosm@redhat.com> References: <20260609163649.319755-1-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 3.4.1 on 10.30.177.111 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 --- 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