linux-kernel - Re: [PATCH tty-next v3 2/6] serial: 8250: Use high-level write function for FIFO

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Message-ID: <ZypD4Uu7Xbbq7iMe@pathway.suse.cz>
Date: Tue, 5 Nov 2024 17:12:17 +0100
From: Petr Mladek <pmladek@...e.com>
To: John Ogness <john.ogness@...utronix.de>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Esben Haabendal <esben@...nix.com>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Rengarajan S <rengarajan.s@...rochip.com>,
	Serge Semin <fancer.lancer@...il.com>,
	Lino Sanfilippo <l.sanfilippo@...bus.com>
Subject: Re: [PATCH tty-next v3 2/6] serial: 8250: Use high-level write
 function for FIFO

On Fri 2024-10-25 13:03:24, John Ogness wrote:
> Currently serial8250_console_fifo_write() directly writes into the
> UART_TX register, rather than using the high-level function
> serial8250_console_putchar(). This is because
> serial8250_console_putchar() waits for the holding register to
> become empty. That would defeat the purpose of the FIFO code.
> 
> Move the LSR_THRE waiting to a new function
> serial8250_console_wait_putchar() so that the FIFO code can use
> serial8250_console_putchar(). This will be particularly important
> for a follow-up commit, where output bytes are inspected to track
> newlines.
> 
> This is only refactoring and has no functional change.
> 
> Signed-off-by: John Ogness <john.ogness@...utronix.de>

Looks good:

Reviewed-by: Petr Mladek <pmladek@...e.com>

Best Regards,
Petr