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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 56E9BC25B4E for ; Sun, 22 Jan 2023 15:08:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230213AbjAVPIW (ORCPT ); Sun, 22 Jan 2023 10:08:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34544 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230196AbjAVPIV (ORCPT ); Sun, 22 Jan 2023 10:08:21 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3026015C85 for ; Sun, 22 Jan 2023 07:08:21 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C228D60C49 for ; Sun, 22 Jan 2023 15:08:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D677CC433EF; Sun, 22 Jan 2023 15:08:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1674400100; bh=gRtKnG0O3XYXJ6+BPD6ZWazRVPFMgbtx/pYlTydbf68=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NwBfV1TntexQfDNxHTqVMrfOBLQJHamoVAI+G+3dMKrPy1daeflUSTkF3AAeC1gxu LzpJr+2OoaiIEOXKUA9Bbxxqa27/L4cCqFDpKnKLXVqTqKaHa18yP1z7pX6aUJ5T8H pQZ3QHKC8R6BCHbqVGLsArJIq66h6Ne/ng+FjA+A= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Mathias Nyman Subject: [PATCH 4.19 10/37] xhci: Add a flag to disable USB3 lpm on a xhci root port level. Date: Sun, 22 Jan 2023 16:04:07 +0100 Message-Id: <20230122150220.011031462@linuxfoundation.org> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230122150219.557984692@linuxfoundation.org> References: <20230122150219.557984692@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Mathias Nyman commit 0522b9a1653048440da5f21747f21e498b9220d1 upstream. One USB3 roothub port may support link power management, while another root port on the same xHC can't due to different retimers used for the ports. This is the case with Intel Alder Lake, and possible future platforms where retimers used for USB4 ports cause too long exit latecy to enable native USB3 lpm U1 and U2 states. Add a flag in the xhci port structure to indicate if the port is lpm_incapable, and check it while calculating exit latency. Cc: stable@vger.kernel.org Signed-off-by: Mathias Nyman Link: https://lore.kernel.org/r/20230116142216.1141605-6-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci.c | 8 ++++++++ drivers/usb/host/xhci.h | 1 + 2 files changed, 9 insertions(+) --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -4917,6 +4917,7 @@ static int xhci_enable_usb3_lpm_timeout( struct usb_device *udev, enum usb3_link_state state) { struct xhci_hcd *xhci; + struct xhci_port *port; u16 hub_encoded_timeout; int mel; int ret; @@ -4930,6 +4931,13 @@ static int xhci_enable_usb3_lpm_timeout( !xhci->devs[udev->slot_id]) return USB3_LPM_DISABLED; + /* If connected to root port then check port can handle lpm */ + if (udev->parent && !udev->parent->parent) { + port = xhci->usb3_rhub.ports[udev->portnum - 1]; + if (port->lpm_incapable) + return USB3_LPM_DISABLED; + } + hub_encoded_timeout = xhci_calculate_lpm_timeout(hcd, udev, state); mel = calculate_max_exit_latency(udev, state, hub_encoded_timeout); if (mel < 0) { --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1723,6 +1723,7 @@ struct xhci_port { int hcd_portnum; struct xhci_hub *rhub; struct xhci_port_cap *port_cap; + unsigned int lpm_incapable:1; }; struct xhci_hub {