linux-kernel - Re: [PATCH] serial: ar933x: Add polling support

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Message-ID: <7867515.MhkbZ0Pkbq@ripper>
Date: Wed, 01 Oct 2025 14:07:53 +0200
From: Sven Eckelmann <se@...onwunderlich.de>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Jiri Slaby <jirislaby@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH] serial: ar933x: Add polling support

On Wednesday, 1 October 2025 13:47:26 CEST Sven Eckelmann wrote:
> KGDB requires at least the polling hooks .poll_get_char and .poll_put_char
> to transmit/receive character via the serial driver.
> 
> Signed-off-by: Sven Eckelmann <se@...onwunderlich.de>
> ---
>  drivers/tty/serial/ar933x_uart.c | 62 ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 62 insertions(+)

I also had a look at break detection to ease the debugging on our side. Just 
to be able to switch to KGDB mode via gdb.

While I got it working, it is more a hack than a good implementation. I've 
attached the hack in case someone wants to continue to work on it.


On Wednesday, 1 October 2025 14:05:41 CEST Greg Kroah-Hartman wrote:
> Right now, the development tree you have sent a patch for is "closed"
> due to the timing of the merge window.  Don't worry, the patch(es) you
> have sent are not lost, and will be looked at after the merge window is
> over (after the -rc1 kernel is released by Linus).

*looks at the calendar* Oh, yes, there was something.

Regards,
	Sven
View attachment "RFC-0001-serial-ar933x-Handle-break-events.patch" of type "text/x-patch" (3958 bytes)

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