From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keith Packard 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 Message-ID: <86pqe3qoky.fsf@sumi.keithp.com> References: <201201281108.58888.jdelvare@suse.de> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1282250979==" Return-path: Received: from keithp.com (home.keithp.com [63.227.221.253]) by gabe.freedesktop.org (Postfix) with ESMTP id 24B119E878 for ; Sat, 28 Jan 2012 17:34:09 -0800 (PST) In-Reply-To: <201201281108.58888.jdelvare@suse.de> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org Errors-To: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org To: Jean Delvare , dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============1282250979== Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha256; protocol="application/pgp-signature" --=-=-= Content-Transfer-Encoding: quoted-printable On Sat, 28 Jan 2012 11:08:58 +0100, Jean Delvare 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. =2D-=20 keith.packard@intel.com --=-=-= Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIVAwUBTySiDTYtFsjWk68qAQiDmw/+KHIUaG5NGzvpzEOewiuFPulg10pEg/rs XOLajcN5ir6bnyNLpm7VkM1nOd//xB7thdm0940OPlWlYZsn/6ONQFKC6tO0BJHl G4/nUZHwkKrW5+3xPLSPUccJMDMYaggnbZB/bxUlKXYlR4MOvxeyde0E4t4RADmJ TFIDTU9lI9aWq2mU/RdQuRYiObLU+Kh+F1DOXFI4zfiGnk0jUoYruDRq3kwXuTpO 3UfBSOgV7I0aQqlBkinJhya9n4Bf/ED/HrNUrUjEkolBsUfiSqMdB6iz1gFzVhW0 dpc12TFB5EQe1AOqPTz4tXtt+phQdE3PDCAtNnw1GZLXn5s/VxsjFikfkIp0Gqjo qcOZ5GbaJ4urhHMzJGV2L0j3pzkATGw+Y4TvVktsjH9wKNHokpe/llYzStTfASbc WQOFFuk9WuyqLrOnHxAwr4AFPkCNytVOx2roqNU20rAI4KS1zi7doRttAV9v3c3y HekkNFVf5FvVMa/mXrFOOythqifGBlJKwbTeHkq0t/PXIyY1BkVHran6itOABt6A OtxyNrt9mbIB+48dXx8T98CZnKIN2l80mLhz9pGLvCqmdWWpc60CZz6f6vJOjtaq KgRTPfIP8NNxjGL0shL77HsNriJs/Ba1vVE1hvu413I4cAsJh58h4c9D/gnm1olA tIlDqumTl8w= =o5JJ -----END PGP SIGNATURE----- --=-=-=-- --===============1282250979== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/dri-devel --===============1282250979==--