From patchwork Wed May 11 22:04:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mathias Nyman X-Patchwork-Id: 12846664 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 42833C433EF for ; Wed, 11 May 2022 22:03:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348491AbiEKWDw (ORCPT ); Wed, 11 May 2022 18:03:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50072 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348462AbiEKWDu (ORCPT ); Wed, 11 May 2022 18:03:50 -0400 Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1598B19C2D for ; Wed, 11 May 2022 15:03:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1652306630; x=1683842630; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=EN9gmAL1uzE9wzMkMJkqUto04AKi/AUcI0B9kmVfeRo=; b=ZjG6O8hgS40tI7491gSOpcWzUUzWipJYITVSmY9gA6fMU6jvHm5pNrzc 5kA87ejlykulJp9vC+gdoYVfpf8NT0he5w+PXhvJD+m2hxIHC4Aq/1AB8 66PqkzLtp3H1DSVCwOrB5xACWSnukGNyOswOe01bXs1+s62LjZvveO/Kx Y11lDZdOtHxwX8JZZO8369rZXyvpncJPQzWYM2OUOVsxCJJ1O4IhVpWjn P1FYr8Z5B42RLPUVM25kFSjOAqvKdF/FGeIiAZxIlDRPICrbCeFXGwuKV jT5BcyMsIkHweos7BV6wCFlmQZi4rEqUUt/kDVw2iNi6Jj0PfIIdOUMXN Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10344"; a="330427463" X-IronPort-AV: E=Sophos;i="5.91,218,1647327600"; d="scan'208";a="330427463" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 May 2022 15:03:49 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.91,218,1647327600"; d="scan'208";a="542496249" Received: from mattu-haswell.fi.intel.com ([10.237.72.199]) by orsmga006.jf.intel.com with ESMTP; 11 May 2022 15:03:48 -0700 From: Mathias Nyman To: Cc: , Mathias Nyman Subject: [PATCH 7/9] xhci: prevent U2 link power state if Intel tier policy prevented U1 Date: Thu, 12 May 2022 01:04:48 +0300 Message-Id: <20220511220450.85367-8-mathias.nyman@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220511220450.85367-1-mathias.nyman@linux.intel.com> References: <20220511220450.85367-1-mathias.nyman@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Don't enable U1 or U2 Link powermanagenet (LPM) states for USB3 devices connected to tier 2 or further hubs. For unknown reasons we previously only prevented U1. Be consistent, and prevent both U1/U2 states if tier policy doesn't allow LPM. Also check the tier policy a bit earlier, and return if U1/U2 is not allowed. This avoids unnecessary xhci MEL commands. Signed-off-by: Mathias Nyman --- drivers/usb/host/xhci.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 19363f542d19..18306e28e7f8 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -4886,9 +4886,6 @@ static int xhci_check_intel_tier_policy(struct usb_device *udev, struct usb_device *parent; unsigned int num_hubs; - if (state == USB3_LPM_U2) - return 0; - /* Don't enable U1 if the device is on a 2nd tier hub or lower. */ for (parent = udev->parent, num_hubs = 0; parent->parent; parent = parent->parent) @@ -4897,7 +4894,7 @@ static int xhci_check_intel_tier_policy(struct usb_device *udev, if (num_hubs < 2) return 0; - dev_dbg(&udev->dev, "Disabling U1 link state for device" + dev_dbg(&udev->dev, "Disabling U1/U2 link state for device" " below second-tier hub.\n"); dev_dbg(&udev->dev, "Plug device into first-tier hub " "to decrease power consumption.\n"); @@ -4938,9 +4935,6 @@ static u16 xhci_calculate_lpm_timeout(struct usb_hcd *hcd, return timeout; } - if (xhci_check_tier_policy(xhci, udev, state) < 0) - return timeout; - /* Gather some information about the currently installed configuration * and alternate interface settings. */ @@ -5047,6 +5041,9 @@ static int xhci_enable_usb3_lpm_timeout(struct usb_hcd *hcd, !xhci->devs[udev->slot_id]) return USB3_LPM_DISABLED; + if (xhci_check_tier_policy(xhci, udev, state) < 0) + 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) {