Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752278AbaA2PQa (ORCPT ); Wed, 29 Jan 2014 10:16:30 -0500 Received: from smtprelay0157.hostedemail.com ([216.40.44.157]:45506 "EHLO smtprelay.hostedemail.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751138AbaA2PQ3 (ORCPT ); Wed, 29 Jan 2014 10:16:29 -0500 X-Session-Marker: 6A6F6540706572636865732E636F6D X-Spam-Summary: 2,0,0,,d41d8cd98f00b204,joe@perches.com,:::::::::::::,RULES_HIT:41:355:379:541:599:988:989:1260:1261:1277:1311:1313:1314:1345:1359:1373:1437:1515:1516:1518:1534:1538:1593:1594:1711:1714:1730:1747:1777:1792:2393:2559:2562:2828:3138:3139:3140:3141:3142:3350:3622:3865:3866:3870:3871:4321:5007:6120:7652:7901:7903:10004:10400:10848:11026:11232:11657:11658:11914:12043:12296:12438:12517:12519:12555:12740:13069:13255:13311:13357:13972,0,RBL:none,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rules:0:0:0 X-HE-Tag: board58_55448523b2209 X-Filterd-Recvd-Size: 1611 Message-ID: <1391008584.11756.59.camel@joe-AO722> Subject: Re: [PATCH v5 17/23] drm/i2c: tda998x: set the PLL division factor in range 0..3 From: Joe Perches To: Jean-Francois Moine Cc: dri-devel@lists.freedesktop.org, Dave Airlie , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Rob Clark , Russell King - ARM Linux Date: Wed, 29 Jan 2014 07:16:24 -0800 In-Reply-To: References: Content-Type: text/plain; charset="ISO-8859-1" X-Mailer: Evolution 3.8.4-0ubuntu1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 2014-01-25 at 18:14 +0100, Jean-Francois Moine wrote: > The predivider division factor of the register PLL_SERIAL_2 is in the > range 0..3, the value 0 being used for a division by 1. trivia: > diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c [] > @@ -886,6 +886,11 @@ tda998x_encoder_mode_set(struct drm_encoder *encoder, > } > > div = 148500 / mode->clock; > + if (div != 0) { > + div--; > + if (div > 3) > + div = 3; > + } perhaps clamp(div, 1, 4) div--; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/