Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932837Ab0HLAHA (ORCPT ); Wed, 11 Aug 2010 20:07:00 -0400 Received: from kroah.org ([198.145.64.141]:60376 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932831Ab0HLAEp (ORCPT ); Wed, 11 Aug 2010 20:04:45 -0400 X-Mailbox-Line: From gregkh@clark.site Wed Aug 11 17:01:28 2010 Message-Id: <20100812000127.944996102@clark.site> User-Agent: quilt/0.48-11.2 Date: Wed, 11 Aug 2010 17:01:06 -0700 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Dave Airlie , Eric Anholt , Manoj Iyer Subject: [51/54] i915: fix ironlake edp panel setup (v4) In-Reply-To: <20100812000249.GA30948@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3215 Lines: 90 2.6.34-stable review patch. If anyone has any objections, please let us know. ------------------ From: Dave Airlie commit fe27d53e5c597ee5ba5d72a29d517091f244e974 upstream. The eDP spec claims a 20% overhead for the 8:10 encoding scheme used on the wire. Take this into account when picking the lane/clock speed for the panel. v3: some panels are out of spec, try our best to deal with them, don't refuse modes on eDP panels, and try the largest allowed settings if all else fails on eDP. v4: fix stupid typo, forgot to git add before amending. Fixes several reports in bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=28070 Signed-off-by: Dave Airlie Signed-off-by: Eric Anholt Cc: Manoj Iyer Signed-off-by: Greg Kroah-Hartman --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -136,6 +136,12 @@ intel_dp_link_required(struct drm_device *dev, } static int +intel_dp_max_data_rate(int max_link_clock, int max_lanes) +{ + return (max_link_clock * max_lanes * 8) / 10; +} + +static int intel_dp_mode_valid(struct drm_connector *connector, struct drm_display_mode *mode) { @@ -144,8 +150,11 @@ intel_dp_mode_valid(struct drm_connector *connector, int max_link_clock = intel_dp_link_clock(intel_dp_max_link_bw(intel_encoder)); int max_lanes = intel_dp_max_lane_count(intel_encoder); - if (intel_dp_link_required(connector->dev, intel_encoder, mode->clock) - > max_link_clock * max_lanes) + /* only refuse the mode on non eDP since we have seen some wierd eDP panels + which are outside spec tolerances but somehow work by magic */ + if (!IS_eDP(intel_encoder) && + (intel_dp_link_required(connector->dev, intel_encoder, mode->clock) + > intel_dp_max_data_rate(max_link_clock, max_lanes))) return MODE_CLOCK_HIGH; if (mode->clock < 10000) @@ -506,7 +515,7 @@ intel_dp_mode_fixup(struct drm_encoder *encoder, struct drm_display_mode *mode, for (lane_count = 1; lane_count <= max_lane_count; lane_count <<= 1) { for (clock = 0; clock <= max_clock; clock++) { - int link_avail = intel_dp_link_clock(bws[clock]) * lane_count; + int link_avail = intel_dp_max_data_rate(intel_dp_link_clock(bws[clock]), lane_count); if (intel_dp_link_required(encoder->dev, intel_encoder, mode->clock) <= link_avail) { @@ -521,6 +530,18 @@ intel_dp_mode_fixup(struct drm_encoder *encoder, struct drm_display_mode *mode, } } } + + if (IS_eDP(intel_encoder)) { + /* okay we failed just pick the highest */ + dp_priv->lane_count = max_lane_count; + dp_priv->link_bw = bws[max_clock]; + adjusted_mode->clock = intel_dp_link_clock(dp_priv->link_bw); + DRM_DEBUG_KMS("Force picking display port link bw %02x lane " + "count %d clock %d\n", + dp_priv->link_bw, dp_priv->lane_count, + adjusted_mode->clock); + return true; + } return false; } -- 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/