From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 83C4F34D3B2; Tue, 4 Nov 2025 10:16:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762251382; cv=none; b=jHgEw/0PEO9hzexVTqVNdL5T+q93Ok1GidRb1AoQ1nFwrstdDYc+3uUOk9Qd75+PRYkbG/RPu1eWuP590J5o7XIQmEB5ku8iVkmOJfTFaAFwGIG84O0bbYYua3qxAy9+1RnH7ARgqc507oefKYragmraYz7QpWbUKeVxaMRXFXs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762251382; c=relaxed/simple; bh=b0NWX2NHAto+3Odhbhmhi+Qkza46c6iqSStc0dGyRT4=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=lVcqOgx6SFCtzcFsPYu9geDW//+YSDRg6P3ui2gzVrT5yNH5jc0977354bp/z1zGLedsq59GE8/8Gtnhse0onuJbOfO6Bq75PxzNo6NQDkIgYslGWD6b/74oMnRv2tX307YRUEWyw7mX5cnObSmE+fkHyMhXy2bYZY4iIT+K6zA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=nZxxKFQk; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=ISp9s7bN; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="nZxxKFQk"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="ISp9s7bN" From: John Ogness DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1762251372; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=ahD5Q7OGPrmb6gtHMTBb/j+mcYIc6r9oz8m1gCQKzkw=; b=nZxxKFQkQxDeTEhMor0tYsjLgHi2Q3lUykSIczYPuW12V5RDnTRuUFkKYSyi+JhAjyklpU 2qVmRCsZ5sLnToWUhvz96tZ5qMqFTJq0eu5uW+ovMNTiQWE4fj/vfOseCtZGUzk/UBSTiF 9HOoU0Gq3eK/xnK+wSmNpRgUlU5reEWESRNYUujAxkIXSFXVyQ9apSjg8R5vd1TtmraZvY RNeUDkRqTMHzN9DJRm0o/eafE4ZQig7COmAHyQfshsZ1AASowIIHmTThD4jveOETYWe+I2 JpJ0KuzKWqt0qfGzqrBQXy3dVzl1+PTMnELkKMzU/28DTrMjeO/LIwdsEY1AbQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1762251372; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=ahD5Q7OGPrmb6gtHMTBb/j+mcYIc6r9oz8m1gCQKzkw=; b=ISp9s7bNn0PZzFlxM7xLGL4vfVk2NJSIv1Mkt600MNf1fC+g/Ncv3tYL3fni+HZVWtA9Mu A9iRmYbPaRlBMbCA== To: Sherry Sun , "esben@geanix.com" , "pmladek@suse.com" , "senozhatsky@chromium.org" , "tglx@linutronix.de" , Greg KH , Jiri Slaby , Shawn Guo , Sascha Hauer , "ryotkkr98@gmail.com" , "kkartik@nvidia.com" , "fj6611ie@aa.jp.fujitsu.com" Cc: Linux Kernel Mailing List , linux-serial , "imx@lists.linux.dev" , Pengutronix Kernel Team , "linux-pm@vger.kernel.org" Subject: RE: [BUG] Suspend failure with nbcon + pm_debug_messages (Linux 6.18-rc4) In-Reply-To: References: <87tszamcaz.fsf@jogness.linutronix.de> Date: Tue, 04 Nov 2025 11:22:11 +0106 Message-ID: <87qzuem7bo.fsf@jogness.linutronix.de> Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain On 2025-11-04, Sherry Sun wrote: >> Thanks for reporting! I believe this is the same issue reported by NVIDIA [0] >> when we tried to switch the 8250 UART driver to nbcon. >> >> We have been working with NVIDIA recently to address the issue. There is a >> patch [1] we are currently testing that looks good so far. It is based on 6.17 >> but should work fine for 6.18-rc4 as well. Can you give it a spin? > > Thanks a lot for your quick reply, I just tried the patch [1] on my > i.MX8MP EVK with L6.18-rc4, it does fix the suspend issue. Now i.MX > UART nbcon can enter suspend with `pm_debug_messages` is turned on. > May I know what is the upstream plan for the patch [1]? Thanks for confirming the fix. I will make an official post on LKML with the patch today. Since the i.MX nbcon-driver is already mainline, I will CC stable. I will CC you as well. Note that the patch still needs a formal review from the printk folks once it hits LKML. John Ogness >> [1] https://github.com/Linutronix/linux/commit/ae173249d9028ef159fba040bdab260d80dda43f