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 X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5C535C433DF for ; Thu, 18 Jun 2020 01:45:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3A8912070A for ; Thu, 18 Jun 2020 01:45:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592444736; bh=qtj/D+MB28dselIr56d3A9KkNgp3lws0TcW2BkKzk2Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=AI/rUbClPFKxF+Y5L7Hmytvx2mgki8ZzNdzz7WzqlWIlw4Ih37ifRO0w2DpLh4tAm mBtEm5QVt452oNEbkMVv5NbLU3BLVsST9pxjAmqYNE0vdNtZYnyn0Oa22LV9rqwkji xi8ln9xP5Kqk092JDVf1l1OaAgkODR5465xCwqb4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732624AbgFRBpe (ORCPT ); Wed, 17 Jun 2020 21:45:34 -0400 Received: from mail.kernel.org ([198.145.29.99]:37470 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732129AbgFRB2j (ORCPT ); Wed, 17 Jun 2020 21:28:39 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A450C2220D; Thu, 18 Jun 2020 01:28:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592443718; bh=qtj/D+MB28dselIr56d3A9KkNgp3lws0TcW2BkKzk2Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DdHr+IsiNdBr4xIbQnqZOmZA5z3haYk+BLIDC/plRA/4Pc+wWGWBzUOBf0/3YfARY goGluUd3OXPzAD8P6/DC9UTJfQs/Nl4WzHy1y7Dz8JJVNIcnwobdtwWuhhj/odXcpm yk1pM8DgrWB3ltSpT251Fq+xxRH5rOONryveXG6A= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: =?UTF-8?q?Pali=20Roh=C3=A1r?= , Tomasz Maciej Nowak , Lorenzo Pieralisi , Rob Herring , Thomas Petazzoni , Sasha Levin , linux-pci@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 15/80] PCI: aardvark: Don't blindly enable ASPM L0s and don't write to read-only register Date: Wed, 17 Jun 2020 21:27:14 -0400 Message-Id: <20200618012819.609778-15-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200618012819.609778-1-sashal@kernel.org> References: <20200618012819.609778-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Pali Rohár [ Upstream commit 90c6cb4a355e7befcb557d217d1d8b8bd5875a05 ] Trying to change Link Status register does not have any effect as this is a read-only register. Trying to overwrite bits for Negotiated Link Width does not make sense. In future proper change of link width can be done via Lane Count Select bits in PCIe Control 0 register. Trying to unconditionally enable ASPM L0s via ASPM Control bits in Link Control register is wrong. There should be at least some detection if endpoint supports L0s as isn't mandatory. Moreover ASPM Control bits in Link Control register are controlled by pcie/aspm.c code which sets it according to system ASPM settings, immediately after aardvark driver probes. So setting these bits by aardvark driver has no long running effect. Remove code which touches ASPM L0s bits from this driver and let kernel's ASPM implementation to set ASPM state properly. Some users are reporting issues that this code is problematic for some Intel wifi cards and removing it fixes them, see e.g.: https://bugzilla.kernel.org/show_bug.cgi?id=196339 If problems with Intel wifi cards occur even after this commit, then pcie/aspm.c code could be modified / hooked to not enable ASPM L0s state for affected problematic cards. Link: https://lore.kernel.org/r/20200430080625.26070-3-pali@kernel.org Tested-by: Tomasz Maciej Nowak Signed-off-by: Pali Rohár Signed-off-by: Lorenzo Pieralisi Acked-by: Rob Herring Acked-by: Thomas Petazzoni Signed-off-by: Sasha Levin --- drivers/pci/host/pci-aardvark.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/drivers/pci/host/pci-aardvark.c b/drivers/pci/host/pci-aardvark.c index 1dbd09c91a7c..736d9f58438e 100644 --- a/drivers/pci/host/pci-aardvark.c +++ b/drivers/pci/host/pci-aardvark.c @@ -363,10 +363,6 @@ static void advk_pcie_setup_hw(struct advk_pcie *pcie) advk_pcie_wait_for_link(pcie); - reg = PCIE_CORE_LINK_L0S_ENTRY | - (1 << PCIE_CORE_LINK_WIDTH_SHIFT); - advk_writel(pcie, reg, PCIE_CORE_LINK_CTRL_STAT_REG); - reg = advk_readl(pcie, PCIE_CORE_CMD_STATUS_REG); reg |= PCIE_CORE_CMD_MEM_ACCESS_EN | PCIE_CORE_CMD_IO_ACCESS_EN | -- 2.25.1