From: Wolfram Sang <w.sang@pengutronix.de>
To: Claudio Scordino <claudio@evidence.eu.com>
Cc: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org,
Alan Cox <alan@linux.intel.com>,
Juergen Beisert <jbe@pengutronix.de>,
Matthias Fuchs <mfuchs@ma-fu.de>
Subject: Re: [PATCH 5/8] serial: 8250: reject delaying RTS with RS485
Date: Thu, 17 Nov 2011 11:14:26 +0100 [thread overview]
Message-ID: <20111117101426.GD2535@pengutronix.de> (raw)
In-Reply-To: <4EC4D72F.8030702@evidence.eu.com>
[-- Attachment #1: Type: text/plain, Size: 700 bytes --]
> The delay must not necessarily be done by hardware. The drivers/tty/serial/crisv10.c
> driver, for example, delays through a msleep.
>
> I don't know if having a software delay in this driver can make sense in some particular
> circumstance.
Uuuh, I would be against software delays for the same reason why we
don't accept software based direction switching: No guarantees. msleep()
might easily delay longer than what was requested. Or are delay_rts
values to be interpreted as "delay at least"?
Regards,
Wolfram
--
Pengutronix e.K. | Wolfram Sang |
Industrial Linux Solutions | http://www.pengutronix.de/ |
[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 198 bytes --]
next prev parent reply other threads:[~2011-11-17 10:14 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-16 16:24 [PATCH 0/8] serial: 8250: support hw-based RS485 direction control (finally!) Wolfram Sang
2011-11-16 16:24 ` [PATCH 1/8] serial: 8250: replace hardcoded 0xbf with #define Wolfram Sang
2011-11-16 16:24 ` [PATCH 2/8] serial: 8250: Add ioctl to enable auto rs485 mode with some Exar UARTs Wolfram Sang
2011-11-17 9:40 ` Claudio Scordino
2011-11-17 10:09 ` Wolfram Sang
2011-11-16 16:24 ` [PATCH 3/8] serial: 8250: save rs485_flags per instance Wolfram Sang
2011-11-16 16:24 ` [PATCH 4/8] serial: 8250: add RX_DURING_TX capability to RS485 mode Wolfram Sang
2011-11-16 16:24 ` [PATCH 5/8] serial: 8250: reject delaying RTS with RS485 Wolfram Sang
2011-11-17 9:43 ` Claudio Scordino
2011-11-17 10:14 ` Wolfram Sang [this message]
2011-11-16 16:24 ` [PATCH 6/8] serial: 8250: update rs485 flags with polarity settings Wolfram Sang
2011-11-16 16:24 ` [PATCH 7/8] serial: 8250: add Exar 16V2750 support Wolfram Sang
2011-11-16 16:24 ` [PATCH 8/8] serial: 8250: fix comment about accessing EMSR Wolfram Sang
2011-11-23 15:03 ` [PATCH 0/8] serial: 8250: support hw-based RS485 direction control (finally!) Wolfram Sang
2011-11-24 16:05 ` Claudio Scordino
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20111117101426.GD2535@pengutronix.de \
--to=w.sang@pengutronix.de \
--cc=alan@linux.intel.com \
--cc=claudio@evidence.eu.com \
--cc=jbe@pengutronix.de \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-serial@vger.kernel.org \
--cc=mfuchs@ma-fu.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).