From: Keith Packard <keithp@keithp.com>
To: Jean Delvare <jdelvare@suse.de>, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH 2/2] drm/radeon/kms: Use the standard VESA timeout for DDC channels
Date: Sat, 28 Jan 2012 17:34:05 -0800 [thread overview]
Message-ID: <86pqe3qoky.fsf@sumi.keithp.com> (raw)
In-Reply-To: <201201281108.58888.jdelvare@suse.de>
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On Sat, 28 Jan 2012 11:08:58 +0100, Jean Delvare <jdelvare@suse.de> wrote:
> The VESA specification suggests a 2.2 ms timeout on DDC channels.
> Use exactly that (as the i915 driver does) instead of hard-coding a
> jiffy count.
The Vesa spec seems to say 2ms; at least according to the DDC/CI spec
paragraph 6.6. usecs_to_jiffies rounds the value it gets up, so we
should never get an interval less than 2ms if we pass 2000us to it.
--
keith.packard@intel.com
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next prev parent reply other threads:[~2012-01-29 1:34 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-28 10:08 [PATCH 2/2] drm/radeon/kms: Use the standard VESA timeout for DDC channels Jean Delvare
2012-01-28 14:46 ` Alex Deucher
2012-01-29 1:34 ` Keith Packard [this message]
2012-03-21 12:22 ` Jean Delvare
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