From: Clifford Wolf <clifford-cPpHkPqGOEfk7+2FdBfRIA@public.gmane.org>
To: David Brownell <david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
Cc: Jean Delvare <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>,
Linux I2C <linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org,
Ben Dooks <ben-linux-elnMNo+KYs3YtjvyW6yDsg@public.gmane.org>
Subject: Re: + i2c-fix-i2c-mpc-driver-for-multi-master-i2c-busses.patch added to -mm tree
Date: Mon, 16 Feb 2009 13:41:13 +0100 [thread overview]
Message-ID: <20090216124112.GA15317@clifford.at> (raw)
In-Reply-To: <200902160358.48176.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
Hi,
On Mon, Feb 16, 2009 at 03:58:47AM -0800, David Brownell wrote:
> I must have missed that. It's not correct, in any case.
> Messages can easily have been *partially* transmitted.
>
> Loss of arbitration appears at the first transmitted bit
> where one master sends '0' and overrides another, which
> is sending '1' instead. Ideally it's while addressing a
> device, but it could be after some data bytes have been
> sent ... and, depending on the slave, acted upon. Even
> after one or more repeated starts.
the master then wins the conflict continues sending its message to the
slave. so the slave never recieves a partial message.
therefore the partially transmitted problem is none and retrying after
arbritration lost is always safe.
yours,
- clifford
--
Relax, its only ONES and ZEROS!
next prev parent reply other threads:[~2009-02-16 12:41 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200812222101.mBML1kn7021201@imap1.linux-foundation.org>
[not found] ` <20090108154604.2cade06e@hyperion.delvare>
[not found] ` <20090109100145.GA12376@clifford.at>
[not found] ` <20090214121745.39dfddf9@hyperion.delvare>
[not found] ` <200902151653.36860.david-b@pacbell.net>
[not found] ` <200902151653.36860.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2009-02-16 8:20 ` + i2c-fix-i2c-mpc-driver-for-multi-master-i2c-busses.patch added to -mm tree Jean Delvare
[not found] ` <20090216092000.13af2d74-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
2009-02-16 11:58 ` David Brownell
[not found] ` <200902160358.48176.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2009-02-16 12:41 ` Clifford Wolf [this message]
2009-02-16 13:08 ` Handling of i2c arbitration loss (Was: i2c-fix-i2c-mpc-driver-for-multi-master-i2c-busses.patch added to -mm tree) Jean Delvare
[not found] ` <20090216140809.01acaea1-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
2009-02-19 19:15 ` David Brownell
[not found] ` <200902191115.07289.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2009-02-19 21:08 ` Clifford Wolf
2009-02-19 21:31 ` Jean Delvare
[not found] ` <20090214180014.GA19352@clifford.at>
[not found] ` <20090215113122.5bcc3f3d@hyperion.delvare>
[not found] ` <20090216131026.GA17437@clifford.at>
[not found] ` <20090216131026.GA17437-cPpHkPqGOEfk7+2FdBfRIA@public.gmane.org>
2009-02-19 16:26 ` Handling of i2c arbitration loss Jean Delvare
[not found] ` <20090219172605.7e70a797-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
2009-02-19 21:23 ` Clifford Wolf
[not found] ` <20090219212325.GC16107-cPpHkPqGOEfk7+2FdBfRIA@public.gmane.org>
2009-02-20 11:45 ` Jean Delvare
[not found] ` <20090220124546.193e49f2-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
2009-04-09 6:47 ` Jean Delvare
[not found] ` <20090409084726.3f2bd193-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
2009-04-09 8:35 ` Clifford Wolf
[not found] ` <20090409083553.GA20058-cPpHkPqGOEfk7+2FdBfRIA@public.gmane.org>
2009-04-23 12:24 ` Jean Delvare
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