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[2620:137:e000::1:20]) by mx.google.com with ESMTP id m23-20020aa7c497000000b004812e6f2d97si10145100edq.537.2023.01.17.11.47.37; Tue, 17 Jan 2023 11:48:00 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232528AbjAQTdV (ORCPT + 99 others); Tue, 17 Jan 2023 14:33:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56134 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232702AbjAQT03 (ORCPT ); Tue, 17 Jan 2023 14:26:29 -0500 Received: from soltyk.jannau.net (soltyk.jannau.net [144.76.91.90]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F082047429 for ; Tue, 17 Jan 2023 10:34:18 -0800 (PST) Received: from robin.home.jannau.net (p579ad32f.dip0.t-ipconnect.de [87.154.211.47]) by soltyk.jannau.net (Postfix) with ESMTPSA id 7FEC926F670; Tue, 17 Jan 2023 19:25:02 +0100 (CET) From: Janne Grunau Date: Tue, 17 Jan 2023 19:25:00 +0100 Subject: [PATCH v2 1/2] nvme-apple: Reset controller during shutdown MIME-Version: 1.0 Message-Id: <20230114-apple-nvme-suspend-fixes-v6.2-v2-1-9157bf633dba@jannau.net> References: <20230114-apple-nvme-suspend-fixes-v6.2-v2-0-9157bf633dba@jannau.net> In-Reply-To: <20230114-apple-nvme-suspend-fixes-v6.2-v2-0-9157bf633dba@jannau.net> To: Hector Martin , Sven Peter , Keith Busch , Jens Axboe , Christoph Hellwig , Sagi Grimberg Cc: Alyssa Rosenzweig , Eric Curtin , asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, Janne Grunau X-Mailer: b4 0.11.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1570; i=j@jannau.net; h=from:subject:message-id; bh=qtyorAlxkkMT/6LLYB1Bf2sjPkpsduWNqrw5l5ng7OU=; b=owGbwMvMwCG2UNrmdq9+ahrjabUkhuRjz//une7jdPHspxsXz4QpX9JqNW8ofLKt7PmpS3uFL4W2 pp5J6ChlYRDjYJAVU2RJ0n7ZwbC6RjGm9kEYzBxWJpAhDFycAjCRp1MZ/kd5BHDxrL5lGKkQLbzupt leg5POL7XC/xQ81XglfsEjewojw7qzBjVf5V6eXtwT5vDAJuO4wuKne1/GtrmEbnK+e63+PgcA X-Developer-Key: i=j@jannau.net; a=openpgp; fpr=8B336A6BE4E5695E89B8532B81E806F586338419 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,SPF_HELO_NONE, SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1755300369689121843?= X-GMAIL-MSGID: =?utf-8?q?1755300369689121843?= This is a functional revert of c76b8308e4c9 ("nvme-apple: fix controller shutdown in apple_nvme_disable"). The commit broke suspend/resume since apple_nvme_reset_work() tries to disable the controller on resume. This does not work for the apple NVMe controller since register access only works while the co-processor firmware is running. Disabling the NVMe controller in the shutdown path is also required for shutting the co-processor down. The original code was appropriate for this hardware. Add a comment to prevent a similar breaking changes in the future. Fixes: c76b8308e4c9 ("nvme-apple: fix controller shutdown in apple_nvme_disable") Reported-by: Janne Grunau Link: https://lore.kernel.org/all/20230110174745.GA3576@jannau.net/ Signed-off-by: Janne Grunau --- drivers/nvme/host/apple.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/nvme/host/apple.c b/drivers/nvme/host/apple.c index bf1c60edb7f9..2a1f11b30615 100644 --- a/drivers/nvme/host/apple.c +++ b/drivers/nvme/host/apple.c @@ -829,7 +829,13 @@ static void apple_nvme_disable(struct apple_nvme *anv, bool shutdown) apple_nvme_remove_cq(anv); } - nvme_disable_ctrl(&anv->ctrl, shutdown); + /* + * Always reset the NVMe controller on shutdown. The reset is + * required to shutdown the co-processor cleanly. + */ + if (shutdown) + nvme_disable_ctrl(&anv->ctrl, shutdown); + nvme_disable_ctrl(&anv->ctrl, false); } WRITE_ONCE(anv->ioq.enabled, false);