From patchwork Tue Oct 21 10:46:35 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dheeraj Jamwal X-Patchwork-Id: 5114951 Return-Path: X-Original-To: patchwork-ltsi-dev@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id A73519F349 for ; Tue, 21 Oct 2014 11:14:01 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id BE1BC20138 for ; Tue, 21 Oct 2014 11:14:00 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C24D220136 for ; Tue, 21 Oct 2014 11:13:59 +0000 (UTC) Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id 7B54CCFE; Tue, 21 Oct 2014 11:01:11 +0000 (UTC) X-Original-To: ltsi-dev@lists.linuxfoundation.org Delivered-To: ltsi-dev@mail.linuxfoundation.org Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 34B09C97 for ; Tue, 21 Oct 2014 11:01:09 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by smtp1.linuxfoundation.org (Postfix) with ESMTP id C7F711FA97 for ; Tue, 21 Oct 2014 11:01:08 +0000 (UTC) Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP; 21 Oct 2014 04:01:08 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.04,761,1406617200"; d="scan'208";a="617793146" Received: from ubuntu-desktop.png.intel.com ([10.221.122.25]) by fmsmga002.fm.intel.com with ESMTP; 21 Oct 2014 04:01:07 -0700 From: Dheeraj Jamwal To: ltsi-dev@lists.linuxfoundation.org Date: Tue, 21 Oct 2014 18:46:35 +0800 Message-Id: <1413889294-31328-196-git-send-email-dheerajx.s.jamwal@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1413889294-31328-1-git-send-email-dheerajx.s.jamwal@intel.com> References: <1413889294-31328-1-git-send-email-dheerajx.s.jamwal@intel.com> X-Spam-Status: No, score=-5.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org Subject: [LTSI-dev] [PATCH 0195/1094] drm/i915: remove wait_for_vblank argument form intel_enable_pipe X-BeenThere: ltsi-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "A list to discuss patches, development, and other things related to the LTSI project" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: ltsi-dev-bounces@lists.linuxfoundation.org Errors-To: ltsi-dev-bounces@lists.linuxfoundation.org X-Virus-Scanned: ClamAV using ClamSMTP From: Paulo Zanoni Add a nice comment explaining why we shouldn't wait for a vblank on all cases, wait based on the HW gen, and add a comment saying we should probably skip that wait on some of the previous HW gens. Signed-off-by: Paulo Zanoni Reviewed-by: Damien Lespiau Signed-off-by: Daniel Vetter (cherry picked from commit e1fdc473bb065888fec4535103d25483addd666f) Signed-off-by: Dheeraj Jamwal --- drivers/gpu/drm/i915/intel_display.c | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index bd737bc..2a72808 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -1747,12 +1747,11 @@ static void lpt_disable_pch_transcoder(struct drm_i915_private *dev_priv) /** * intel_enable_pipe - enable a pipe, asserting requirements * @crtc: crtc responsible for the pipe - * @wait_for_vblank: whether we should for a vblank or not after enabling it * * Enable @crtc's pipe, making sure that various hardware specific requirements * are met, if applicable, e.g. PLL enabled, LVDS pairs enabled, etc. */ -static void intel_enable_pipe(struct intel_crtc *crtc, bool wait_for_vblank) +static void intel_enable_pipe(struct intel_crtc *crtc) { struct drm_device *dev = crtc->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; @@ -1799,7 +1798,15 @@ static void intel_enable_pipe(struct intel_crtc *crtc, bool wait_for_vblank) I915_WRITE(reg, val | PIPECONF_ENABLE); POSTING_READ(reg); - if (wait_for_vblank) + + /* + * There's no guarantee the pipe will really start running now. It + * depends on the Gen, the output type and the relative order between + * pipe and plane enabling. Avoid waiting on HSW+ since it's not + * necessary. + * TODO: audit the previous gens. + */ + if (INTEL_INFO(dev)->gen <= 7 && !IS_HASWELL(dev)) intel_wait_for_vblank(dev_priv->dev, pipe); } @@ -3596,7 +3603,7 @@ static void ironlake_crtc_enable(struct drm_crtc *crtc) intel_crtc_load_lut(crtc); intel_update_watermarks(crtc); - intel_enable_pipe(intel_crtc, true); + intel_enable_pipe(intel_crtc); intel_enable_primary_plane(dev_priv, plane, pipe); intel_enable_planes(crtc); intel_crtc_update_cursor(crtc, true); @@ -3741,7 +3748,7 @@ static void haswell_crtc_enable(struct drm_crtc *crtc) intel_ddi_enable_transcoder_func(crtc); intel_update_watermarks(crtc); - intel_enable_pipe(intel_crtc, false); + intel_enable_pipe(intel_crtc); if (intel_crtc->config.has_pch_encoder) lpt_pch_enable(crtc); @@ -4166,7 +4173,7 @@ static void valleyview_crtc_enable(struct drm_crtc *crtc) intel_crtc_load_lut(crtc); intel_update_watermarks(crtc); - intel_enable_pipe(intel_crtc, true); + intel_enable_pipe(intel_crtc); intel_set_cpu_fifo_underrun_reporting(dev, pipe, true); intel_enable_primary_plane(dev_priv, plane, pipe); intel_enable_planes(crtc); @@ -4205,7 +4212,7 @@ static void i9xx_crtc_enable(struct drm_crtc *crtc) intel_crtc_load_lut(crtc); intel_update_watermarks(crtc); - intel_enable_pipe(intel_crtc, true); + intel_enable_pipe(intel_crtc); intel_set_cpu_fifo_underrun_reporting(dev, pipe, true); intel_enable_primary_plane(dev_priv, plane, pipe); intel_enable_planes(crtc);