From patchwork Wed Oct 16 20:57:20 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joseph Salisbury X-Patchwork-Id: 284026 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from huckleberry.canonical.com (huckleberry.canonical.com [91.189.94.19]) by ozlabs.org (Postfix) with ESMTP id D19822C0196 for ; Thu, 17 Oct 2013 07:57:51 +1100 (EST) Received: from localhost ([127.0.0.1] helo=huckleberry.canonical.com) by huckleberry.canonical.com with esmtp (Exim 4.76) (envelope-from ) id 1VWY9y-0000Mp-Cc; Wed, 16 Oct 2013 20:57:38 +0000 Received: from youngberry.canonical.com ([91.189.89.112]) by huckleberry.canonical.com with esmtp (Exim 4.76) (envelope-from ) id 1VWY9s-0000Mc-RV for kernel-team@lists.ubuntu.com; Wed, 16 Oct 2013 20:57:32 +0000 Received: from 66-189-89-211.dhcp.oxfr.ma.charter.com ([66.189.89.211] helo=salisbury) by youngberry.canonical.com with esmtpsa (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1VWY9s-0006fJ-NG for kernel-team@lists.ubuntu.com; Wed, 16 Oct 2013 20:57:32 +0000 Received: by salisbury (Postfix, from userid 1000) id 1A364780637; Wed, 16 Oct 2013 16:57:20 -0400 (EDT) From: Joseph Salisbury To: kernel-team@lists.ubuntu.com Subject: [Saucy][SRU][PATCH 1/1] (no-up) Revert "Revert "drm/i915: revert eDP bpp clamping code changes"" Date: Wed, 16 Oct 2013 16:57:20 -0400 Message-Id: <397b1b6f028317a3ef897cdaf79eb1e5519e587d.1381939165.git.joseph.salisbury@canonical.com> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: References: In-Reply-To: References: X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.14 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: kernel-team-bounces@lists.ubuntu.com Sender: kernel-team-bounces@lists.ubuntu.com BugLink: http://bugs.launchpad.net/bugs/1195483 This reverts commit 657445fe8660100ad174600ebfa61536392b7624. Signed-off-by: Joseph Salisbury --- drivers/gpu/drm/i915/intel_dp.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 26e162b..ce933ad 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -709,10 +709,7 @@ intel_dp_compute_config(struct intel_encoder *encoder, /* Walk through all bpp values. Luckily they're all nicely spaced with 2 * bpc in between. */ - bpp = pipe_config->pipe_bpp; - if (is_edp(intel_dp) && dev_priv->vbt.edp_bpp) - bpp = min_t(int, bpp, dev_priv->vbt.edp_bpp); - + bpp = min_t(int, 8*3, pipe_config->pipe_bpp); for (; bpp >= 6*3; bpp -= 2*3) { mode_rate = intel_dp_link_required(adjusted_mode->clock, bpp); @@ -763,6 +760,19 @@ found: &pipe_config->dp_m_n); intel_dp_set_clock(encoder, pipe_config, intel_dp->link_bw); + /* + * XXX: We have a strange regression where using the vbt edp bpp value + * for the link bw computation results in black screens, the panel only + * works when we do the computation at the usual 24bpp (but still + * requires us to use 18bpp). Until that's fully debugged, stay + * bug-for-bug compatible with the old code. + */ + if (is_edp(intel_dp) && dev_priv->vbt.edp_bpp) { + DRM_DEBUG_KMS("clamping display bpc (was %d) to eDP (%d)\n", + bpp, dev_priv->vbt.edp_bpp); + bpp = min_t(int, bpp, dev_priv->vbt.edp_bpp); + } + pipe_config->pipe_bpp = bpp; return true; }