From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Jean Delvare <jdelvare@suse.de>
Cc: dri-devel@lists.freedesktop.org
Subject: Re: [PATCH 1/2] drm/kms: Make i2c buses faster
Date: Fri, 21 Oct 2011 14:32:44 +0100 [thread overview]
Message-ID: <20111021143244.4d1eac1e@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <201110210908.30632.jdelvare@suse.de>
On Fri, 21 Oct 2011 09:08:30 +0200
Jean Delvare <jdelvare@suse.de> wrote:
> A udelay value of 20 leads to an I2C bus running at only 25 kbps. A
> value of 40 as the nouveau driver has is even slower at 12.5 kbps. I2C
> devices can typically operate faster than this, 50 kbps should be fine
> for all devices (and compliant devices can always stretch the clock is
> needed.)
That depends on your cable, drive and signal quality. It's not something
you just turn up because it seems a good idea. Reliability is MUCH more
important than shaving microseconds off monitor probe times.
Alan
next prev parent reply other threads:[~2011-10-21 13:32 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-21 7:08 [PATCH 1/2] drm/kms: Make i2c buses faster Jean Delvare
2011-10-21 13:32 ` Alan Cox [this message]
2011-10-21 14:16 ` Jean Delvare
2011-10-21 18:05 ` Alex Deucher
2011-10-21 19:29 ` Jean Delvare
2011-10-22 14:38 ` Alex Deucher
2011-10-24 14:19 ` Eugeni Dodonov
-- strict thread matches above, loose matches on Subject: below --
2012-01-28 10:07 Jean Delvare
2012-01-28 14:46 ` Alex Deucher
2012-01-29 1:26 ` Keith Packard
2012-03-21 10:45 ` Jean Delvare
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