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 C716EEB64DB for ; Wed, 14 Jun 2023 06:35:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243138AbjFNGfm (ORCPT ); Wed, 14 Jun 2023 02:35:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43986 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243281AbjFNGfH (ORCPT ); Wed, 14 Jun 2023 02:35:07 -0400 Received: from smtp-relay-canonical-1.canonical.com (smtp-relay-canonical-1.canonical.com [185.125.188.121]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A75971709; Tue, 13 Jun 2023 23:33:48 -0700 (PDT) Received: from localhost.localdomain (unknown [10.101.196.174]) (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 smtp-relay-canonical-1.canonical.com (Postfix) with ESMTPSA id ECD893FE8F; Wed, 14 Jun 2023 06:33:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1686724426; bh=+hqis1W8nQ4EkQUmco7jTscaaZbuSwY0XCyi+/U9QfM=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=wIVM1sNd+ojHp6usjuvn93Ejfp9bdZeFSaG46lVPT9zOIp8wytXooK36JiMTSSn0l 2eDxchP16vkMHZh9WMeLMOU2uMYGl2IC72DT9wEtoCN8kE1SKDZyKISm6VclhVjH/K pM7P3JTy9iTfu8Met2cxNQk3SUybNSvxw4H3B5ZkrdBYvUX6a3HdEqTVRdIWGKE4bN cGy0m6IQJBwBfD+iG9SDVbKk8b6BQnCCFks9n+yETD6WkkbiY/dOe28fNPPKk/AY1w t7LdI6MxufhU+CLvZ7/233P6hdL4RZwqhDqF6cvYqn1aXRlc7irfxVq2mCg44OOzkJ Wu9959Z93e1Kg== From: Kai-Heng Feng To: nbd@nbd.name, lorenzo@kernel.org, ryder.lee@mediatek.com Cc: Kai-Heng Feng , Shayne Chen , Sean Wang , Kalle Valo , Matthias Brugger , AngeloGioacchino Del Regno , Deren Wu , Leon Yen , linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Subject: [PATCH] wifi: mt76: mt7921e: Perform FLR to recovery the device Date: Wed, 14 Jun 2023 14:32:50 +0800 Message-Id: <20230614063252.1650824-1-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When "Pre-boot WiFi" is enabled in BIOS, the mt7921e device may not work: mt7921e 0000:02:00.0: ASIC revision: 79220010 mt7921e 0000:02:00.0: Message 00000010 (seq 1) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: Message 00000010 (seq 2) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: Message 00000010 (seq 3) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: Message 00000010 (seq 4) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: Message 00000010 (seq 5) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: Message 00000010 (seq 6) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: Message 00000010 (seq 7) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: Message 00000010 (seq 8) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: Message 00000010 (seq 9) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: Message 00000010 (seq 10) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: hardware init failed After some trials and errors, it shows that PCI function level reset can recover the device back to a functional state. So perform FLR at probe routine to workaround the issue. Signed-off-by: Kai-Heng Feng --- drivers/net/wireless/mediatek/mt76/mt7921/pci.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c index ddb1fa4ee01d..9671fbe35a8e 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c @@ -262,6 +262,10 @@ static int mt7921_pci_probe(struct pci_dev *pdev, int ret; u16 cmd; + ret = pci_reset_function_locked(pdev); + if (ret) + pci_info(pdev, "Unable to perform FLR\n"); + ret = pcim_enable_device(pdev); if (ret) return ret; -- 2.34.1