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From: "Andrew Victor" <avictor.za-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: David Brownell <david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
Cc: i2c-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org,
	Ben Dooks <ben-linux-elnMNo+KYs3YtjvyW6yDsg@public.gmane.org>
Subject: Re: [RFC: 2.6 patch] remove the i2c-at91.c driver
Date: Thu, 4 Sep 2008 22:14:41 +0200	[thread overview]
Message-ID: <cd73a99e0809041314i54c7fd71ued53270517ecc829@mail.gmail.com> (raw)
In-Reply-To: <200809041218.49604.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>

hi David,

> But I recall the lack of flow control to be a bigger issue.
> The hardware liked to TX the next byte before it was loaded
> into the (single byte) TX fifo, and then complain that there
> was no byte there.  And likewise, to RX the next byte before
> the previous one got removed.  Or ... if that's not what it
> was doing, it sure acted like it was!  Now, *THOSE* issues
> seem highly amenable to hardware-only fixes:  just stretch
> the clock until the FIFO is ready.

According to the datasheet, the G20 supports both clock stretching and
repeated starts.
The TWI is now also connected to a PDC, so we can set-up a DMA buffer
for the TWI receives and transmits.


Regards,
  Andrew Victor

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i2c mailing list
i2c-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org
http://lists.lm-sensors.org/mailman/listinfo/i2c

  parent reply	other threads:[~2008-09-04 20:14 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-08-31 16:10 [RFC: 2.6 patch] remove the i2c-at91.c driver Adrian Bunk
     [not found] ` <20080831161005.GC3695-re2QNgSbS3j4D6uPqz5PAwR5/fbUUdgG@public.gmane.org>
2008-09-01 13:13   ` Andrew Victor
     [not found]     ` <cd73a99e0809010613w40569b3fv9f5fc96a7bfb6a29-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-09-02 10:11       ` Ben Dooks
     [not found]         ` <20080902101127.GJ2716-elnMNo+KYs3pIgCt6eIbzw@public.gmane.org>
2008-09-04 18:55           ` Andrew Victor
     [not found]             ` <cd73a99e0809041155m1f9e576dt5659da679fffb56d-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-09-04 19:18               ` David Brownell
     [not found]                 ` <200809041218.49604.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2008-09-04 20:14                   ` Andrew Victor [this message]
     [not found]                     ` <cd73a99e0809041314i54c7fd71ued53270517ecc829-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-09-04 20:25                       ` David Brownell
     [not found]                         ` <200809041325.30330.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2008-09-22 18:22                           ` Andrew Victor
2008-09-02 10:24       ` Ben Dooks

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