From patchwork Mon Nov 20 12:06:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jose Ignacio Tornos Martinez X-Patchwork-Id: 13461133 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="feyk5uCz" Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6245BF1 for ; Mon, 20 Nov 2023 04:07:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1700482019; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=E4L8bVjqEkvHhs/ZW+HMgpg1xC58k9+Ym9UYgqEjP94=; b=feyk5uCzI4TRmZyPvjH9O8HoDGRnLCHdwVzn2RspNpIksTgyIVcdJBFUkwwNnNBYffv8Q0 RUQg6SW0/vmpLlO9O22CuwlTJ5tb9LoOOv1GZeLb7pVLv9/R3b1yWR238nCnh1MazhbPL6 M7iuWBaXwOy+ptfPFxseR14M7QgpsEo= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-596-U29Fn8xzOjKBHZFCT7zRzw-1; Mon, 20 Nov 2023 07:06:56 -0500 X-MC-Unique: U29Fn8xzOjKBHZFCT7zRzw-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (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 mimecast-mx02.redhat.com (Postfix) with ESMTPS id DA174185A782; Mon, 20 Nov 2023 12:06:55 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.39.193.97]) by smtp.corp.redhat.com (Postfix) with ESMTP id 79E8E2166B26; Mon, 20 Nov 2023 12:06:52 +0000 (UTC) From: Jose Ignacio Tornos Martinez To: pabeni@redhat.com Cc: davem@davemloft.net, edumazet@google.com, jtornosm@redhat.com, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, netdev@vger.kernel.org, weihao.bj@ieisystem.com Subject: [PATCH v2 1/2] net: usb: ax88179_178a: fix failed operations during ax88179_reset Date: Mon, 20 Nov 2023 13:06:29 +0100 Message-ID: <20231120120642.54334-1-jtornosm@redhat.com> In-Reply-To: <020ff11184bb22909287ef68d97c00f7d2c73bd6.camel@redhat.com> References: <020ff11184bb22909287ef68d97c00f7d2c73bd6.camel@redhat.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.6 Using generic ASIX Electronics Corp. AX88179 Gigabit Ethernet device, the following test cycle has been implemented: - power on - check logs - shutdown - after detecting the system shutdown, disconnect power - after approximately 60 seconds of sleep, power is restored Running some cycles, sometimes error logs like this appear: kernel: ax88179_178a 2-9:1.0 (unnamed net_device) (uninitialized): Failed to write reg index 0x0001: -19 kernel: ax88179_178a 2-9:1.0 (unnamed net_device) (uninitialized): Failed to read reg index 0x0001: -19 ... These failed operation are happening during ax88179_reset execution, so the initialization could not be correct. In order to avoid this, we need to increase the delay after reset and clock initial operations. By using these larger values, many cycles have been run and no failed operations appear. It would be better to check some status register to verify when the operation has finished, but I do not have found any available information (neither in the public datasheets nor in the manufacturer's driver). The only available information for the necessary delays is the maufacturer's driver (original values) but the proposed values are not enough for the tested devices. Fixes: e2ca90c276e1f ("ax88179_178a: ASIX AX88179_178A USB 3.0/2.0 to gigabit ethernet adapter driver") Reported-by: Herb Wei Tested-by: Herb Wei Signed-off-by: Jose Ignacio Tornos Martinez --- V1 -> V2: - Add Fixes tag. - Comments about the available information and manufacturer's driver reference to complete why the new values are needed. drivers/net/usb/ax88179_178a.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c index aff39bf3161d..4ea0e155bb0d 100644 --- a/drivers/net/usb/ax88179_178a.c +++ b/drivers/net/usb/ax88179_178a.c @@ -1583,11 +1583,11 @@ static int ax88179_reset(struct usbnet *dev) *tmp16 = AX_PHYPWR_RSTCTL_IPRL; ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL, 2, 2, tmp16); - msleep(200); + msleep(500); *tmp = AX_CLK_SELECT_ACS | AX_CLK_SELECT_BCS; ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_CLK_SELECT, 1, 1, tmp); - msleep(100); + msleep(200); /* Ethernet PHY Auto Detach*/ ax88179_auto_detach(dev);