From: John Ogness <john.ogness@linutronix.de>
To: Sherry Sun <sherry.sun@nxp.com>,
"esben@geanix.com" <esben@geanix.com>,
"pmladek@suse.com" <pmladek@suse.com>,
"senozhatsky@chromium.org" <senozhatsky@chromium.org>,
"tglx@linutronix.de" <tglx@linutronix.de>,
Greg KH <gregkh@linuxfoundation.org>,
Jiri Slaby <jirislaby@kernel.org>,
Shawn Guo <shawnguo@kernel.org>,
Sascha Hauer <s.hauer@pengutronix.de>,
"ryotkkr98@gmail.com" <ryotkkr98@gmail.com>,
"kkartik@nvidia.com" <kkartik@nvidia.com>,
"fj6611ie@aa.jp.fujitsu.com" <fj6611ie@aa.jp.fujitsu.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-serial <linux-serial@vger.kernel.org>,
"imx@lists.linux.dev" <imx@lists.linux.dev>,
Pengutronix Kernel Team <kernel@pengutronix.de>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>
Subject: RE: [BUG] Suspend failure with nbcon + pm_debug_messages (Linux 6.18-rc4)
Date: Tue, 04 Nov 2025 11:22:11 +0106 [thread overview]
Message-ID: <87qzuem7bo.fsf@jogness.linutronix.de> (raw)
In-Reply-To: <DB9PR04MB842977523C92FDE8AF4B714A92C4A@DB9PR04MB8429.eurprd04.prod.outlook.com>
On 2025-11-04, Sherry Sun <sherry.sun@nxp.com> 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
next prev parent reply other threads:[~2025-11-04 10:16 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-04 7:44 [BUG] Suspend failure with nbcon + pm_debug_messages (Linux 6.18-rc4) Sherry Sun
2025-11-04 8:28 ` John Ogness
2025-11-04 9:46 ` Sherry Sun
2025-11-04 10:16 ` John Ogness [this message]
2025-11-04 10:43 ` Sherry Sun
2025-11-04 23:19 ` John Ogness
2025-11-05 3:43 ` Sherry Sun
2025-11-05 7:30 ` Petr Mladek
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