From patchwork Wed May 17 10:52:35 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Ilpo_J=C3=A4rvinen?= X-Patchwork-Id: 13244646 X-Patchwork-Delegate: kvalo@adurom.com 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 73557C7EE23 for ; Wed, 17 May 2023 10:58:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230440AbjEQK6n (ORCPT ); Wed, 17 May 2023 06:58:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42388 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230216AbjEQK6l (ORCPT ); Wed, 17 May 2023 06:58:41 -0400 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6FE4B61AD; Wed, 17 May 2023 03:58:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1684321090; x=1715857090; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=FuFXzjOd8Jq9CElj4g5CQDGQFvJ4smZ3IyuF6JWPb+E=; b=kQSZsMOP7zbF5CIsF2HnMdNXkYQo4aP36Lu9xtRHy9xYKfeyHhzjwgkl 3oAILAs6t+0q6cUuUzN1UNqt6GBKKZ89XWP8DjVBFVbJUeh78oh9XiRYr uZ1AKfjKnv+/aHUXdMIrDHZMRE0iVEIsU8llkpPwlkcOCziLj/AdKrtHo +50FeaZEfiLfpsIjamNihbBv7t9comLqJxJ+MdVbIiXet2paXZnSWr0bK I7b9I1KiJ5tBNBw9OcZsszAQ2Kamo0dfTzJ0o7twnXBDtLodgndiB60wr jzGuB9p6j5QPcA6Ia8eYhOjC3TH32lEOHVHOy6D4o63EZZDHqurwFw2mz Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10712"; a="438071923" X-IronPort-AV: E=Sophos;i="5.99,281,1677571200"; d="scan'208";a="438071923" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 May 2023 03:54:06 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10712"; a="734651392" X-IronPort-AV: E=Sophos;i="5.99,281,1677571200"; d="scan'208";a="734651392" Received: from lnstern-mobl1.amr.corp.intel.com (HELO ijarvine-MOBL2.ger.corp.intel.com) ([10.251.221.185]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 May 2023 03:53:59 -0700 From: =?utf-8?q?Ilpo_J=C3=A4rvinen?= To: linux-pci@vger.kernel.org, Bjorn Helgaas , Lorenzo Pieralisi , Rob Herring , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Emmanuel Grumbach , "Rafael J . Wysocki" , Heiner Kallweit , Lukas Wunner , Kalle Valo , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Michal Kazior , Janusz Dziedzic , ath10k@lists.infradead.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Dean Luick , Andy Shevchenko , =?utf-8?q?Ilpo_J=C3=A4?= =?utf-8?q?rvinen?= , stable@vger.kernel.org Subject: [PATCH v2 9/9] wifi: ath10k: Use RMW accessors for changing LNKCTL Date: Wed, 17 May 2023 13:52:35 +0300 Message-Id: <20230517105235.29176-10-ilpo.jarvinen@linux.intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230517105235.29176-1-ilpo.jarvinen@linux.intel.com> References: <20230517105235.29176-1-ilpo.jarvinen@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Don't assume that only the driver would be accessing LNKCTL. ASPM policy changes can trigger write to LNKCTL outside of driver's control. Use RMW capability accessors which does proper locking to avoid losing concurrent updates to the register value. On restore, clear the ASPMC field properly. Fixes: 76d870ed09ab ("ath10k: enable ASPM") Suggested-by: Lukas Wunner Signed-off-by: Ilpo Järvinen Cc: stable@vger.kernel.org Acked-by: Kalle Valo --- drivers/net/wireless/ath/ath10k/pci.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/ath/ath10k/pci.c b/drivers/net/wireless/ath/ath10k/pci.c index a7f44f6335fb..9275a672f90c 100644 --- a/drivers/net/wireless/ath/ath10k/pci.c +++ b/drivers/net/wireless/ath/ath10k/pci.c @@ -1963,8 +1963,9 @@ static int ath10k_pci_hif_start(struct ath10k *ar) ath10k_pci_irq_enable(ar); ath10k_pci_rx_post(ar); - pcie_capability_write_word(ar_pci->pdev, PCI_EXP_LNKCTL, - ar_pci->link_ctl); + pcie_capability_clear_and_set_word(ar_pci->pdev, PCI_EXP_LNKCTL, + PCI_EXP_LNKCTL_ASPMC, + ar_pci->link_ctl & PCI_EXP_LNKCTL_ASPMC); return 0; } @@ -2821,8 +2822,8 @@ static int ath10k_pci_hif_power_up(struct ath10k *ar, pcie_capability_read_word(ar_pci->pdev, PCI_EXP_LNKCTL, &ar_pci->link_ctl); - pcie_capability_write_word(ar_pci->pdev, PCI_EXP_LNKCTL, - ar_pci->link_ctl & ~PCI_EXP_LNKCTL_ASPMC); + pcie_capability_clear_word(ar_pci->pdev, PCI_EXP_LNKCTL, + PCI_EXP_LNKCTL_ASPMC); /* * Bring the target up cleanly.