From: Lino Sanfilippo <LinoSanfilippo@gmx.de>
To: "Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jirislaby@kernel.org>,
robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
vz@mleia.com, linux-arm-kernel@lists.infradead.org,
devicetree@vger.kernel.org,
linux-serial <linux-serial@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
lukas@wunner.de, p.rosenberger@kunbus.com,
Lino Sanfilippo <l.sanfilippo@kunbus.com>
Subject: Re: [PATCH 7/8] serial: ar933x: Remove redundant assignment in rs485_config
Date: Sun, 26 Jun 2022 16:09:48 +0200 [thread overview]
Message-ID: <df19d91d-371b-f0e9-e37c-2bde00d2b840@gmx.de> (raw)
In-Reply-To: <f7beef4-c422-cae3-8e22-8652b407434@linux.intel.com>
On 25.06.22 at 12:14, Ilpo Järvinen wrote:
> On Wed, 22 Jun 2022, Lino Sanfilippo wrote:
>
>> From: Lino Sanfilippo <l.sanfilippo@kunbus.com>
>>
>> In uart_set_rs485_config() the serial core already assigns the passed
>> serial_rs485 struct to the uart port.
>>
>> So remove the assignment in the drivers rs485_config() function to avoid
>> redundancy.
>>
>> Signed-off-by: Lino Sanfilippo <l.sanfilippo@kunbus.com>
>> ---
>> drivers/tty/serial/ar933x_uart.c | 1 -
>> 1 file changed, 1 deletion(-)
>>
>> diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
>> index ab2c5b2a1ce8..857e010d01dc 100644
>> --- a/drivers/tty/serial/ar933x_uart.c
>> +++ b/drivers/tty/serial/ar933x_uart.c
>> @@ -591,7 +591,6 @@ static int ar933x_config_rs485(struct uart_port *port,
>> dev_err(port->dev, "RS485 needs rts-gpio\n");
>> return 1;
>> }
>> - port->rs485 = *rs485conf;
>> return 0;
>> }
>
> Hmm, I realize that for some reason I missed cleaning up this particular
> driver after introducing the serial_rs485 sanitization. It shouldn't need
> that preceeding if block either because ar933x_no_rs485 gets applied if
> there's no rts_gpiod so the core clears SER_RS485_ENABLED.
>
I think we still need that "if" in case that RS485 was not enabled at driver
startup (no rs485-enabled-at-boot-time) and no RTS GPIO was defined but then
RS485 is enabled via TIOCSRS485.
Maybe in ar933x_uart_probe()
if ((port->rs485.flags & SER_RS485_ENABLED) &&
!up->rts_gpiod) {
dev_err(&pdev->dev, "lacking rts-gpio, disabling RS485\n");
port->rs485.flags &= ~SER_RS485_ENABLED;
port->rs485_supported = &ar933x_no_rs485;
}
should rather be
if (!up->rts_gpiod) {
dev_err(&pdev->dev, "lacking rts-gpio, disabling RS485\n");
port->rs485.flags &= ~SER_RS485_ENABLED;
port->rs485_supported = &ar933x_no_rs485;
}
Regards,
Lino
next prev parent reply other threads:[~2022-06-26 14:10 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-22 15:46 [PATCH 0/8] Fixes and cleanup for RS485 Lino Sanfilippo
2022-06-22 15:46 ` [PATCH 1/8] serial: core: only get RS485 termination gpio if supported Lino Sanfilippo
2022-06-22 17:04 ` Andy Shevchenko
2022-06-23 1:59 ` Lino Sanfilippo
2022-06-23 9:45 ` Andy Shevchenko
2022-06-23 16:08 ` Lino Sanfilippo
2022-06-23 16:32 ` Andy Shevchenko
2022-06-23 20:19 ` Lino Sanfilippo
2022-06-25 19:49 ` Lukas Wunner
2022-06-27 9:05 ` Ilpo Järvinen
2022-07-02 16:50 ` Lino Sanfilippo
2022-06-22 15:46 ` [PATCH 2/8] serial: core, 8250: set RS485 termination gpio in serial core Lino Sanfilippo
2022-06-22 17:06 ` Andy Shevchenko
2022-06-23 2:03 ` Lino Sanfilippo
2022-06-25 10:40 ` Ilpo Järvinen
2022-06-26 15:41 ` Lino Sanfilippo
2022-06-25 19:58 ` Lukas Wunner
2022-06-26 13:36 ` Lino Sanfilippo
2022-06-28 8:31 ` Ilpo Järvinen
2022-06-22 15:46 ` [PATCH 3/8] serial: core: move sanitizing of RS485 delays into own function Lino Sanfilippo
2022-06-23 16:25 ` Andy Shevchenko
2022-06-23 20:17 ` Lino Sanfilippo
2022-06-25 9:37 ` Ilpo Järvinen
2022-06-22 15:46 ` [PATCH 4/8] serial: core: sanitize RS485 delays read from device tree Lino Sanfilippo
2022-06-25 10:05 ` Ilpo Järvinen
2022-06-26 14:25 ` Lino Sanfilippo
2022-06-22 15:46 ` [PATCH 5/8] dt_bindings: rs485: Correct delay values Lino Sanfilippo
2022-06-23 16:29 ` Andy Shevchenko
2022-06-23 20:17 ` Lino Sanfilippo
2022-06-25 9:54 ` Ilpo Järvinen
2022-06-27 9:23 ` Ilpo Järvinen
2022-06-28 10:03 ` Andy Shevchenko
2022-06-29 23:50 ` Lino Sanfilippo
2022-06-22 15:46 ` [PATCH 6/8] serial: 8250_dwlib: remove redundant sanity check for RS485 flags Lino Sanfilippo
2022-06-25 10:21 ` Ilpo Järvinen
2022-06-22 15:46 ` [PATCH 7/8] serial: ar933x: Remove redundant assignment in rs485_config Lino Sanfilippo
2022-06-25 10:14 ` Ilpo Järvinen
2022-06-26 14:09 ` Lino Sanfilippo [this message]
2022-06-27 8:14 ` Ilpo Järvinen
2022-06-30 0:33 ` Lino Sanfilippo
2022-06-22 15:46 ` [PATCH 8/8] serial: 8250: lpc18xx: Remove redundant sanity check for RS485 flags Lino Sanfilippo
2022-06-25 10:18 ` Ilpo Järvinen
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