From patchwork Tue Sep 10 22:36:34 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rodrigo Vivi X-Patchwork-Id: 2868041 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id BC1F8BF43F for ; Tue, 10 Sep 2013 23:08:46 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id ECCBC20458 for ; Tue, 10 Sep 2013 23:08:45 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id BCE54203DA for ; Tue, 10 Sep 2013 23:08:44 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C2980E63C7 for ; Tue, 10 Sep 2013 16:08:44 -0700 (PDT) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mail-ye0-f171.google.com (mail-ye0-f171.google.com [209.85.213.171]) by gabe.freedesktop.org (Postfix) with ESMTP id 316BFE747B for ; Tue, 10 Sep 2013 15:37:10 -0700 (PDT) Received: by mail-ye0-f171.google.com with SMTP id q3so2844982yen.30 for ; Tue, 10 Sep 2013 15:37:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=WDzpPTOCydtjOOELqWw5RB1fpBoIPmsCD5k7e70jcBY=; b=ueus2I/DzG/eqDlUL8dVUdhHZ2TosSmiNt4VvzuBwGjzI1sgIJhejG4Vvmh67GeIYR KrlJaSuPYhDo0zyD2zNQxA6sWJjorvCe9Hz8LRHo8y+B/E8pkD/txEfZ4RkDkEFbJ4FQ Zi+kBxXkpZqGGSNrRoPFzcD7DXD/sT+G/BP+C7fAOWpKZxJwLT8I7CMrzwAS+yrHKz9H CjaxUNLq+/4vOYA2N0OKjufHPhG17VqGfQjO4a/mUMMWfYjxT6xpm07eTc9nAcfcUW/k eZYhTbwXHBhqPpL5BVVDqgIBm66z2wOdieegIrE9dThu8u6zvTgYp6CWQZ3rTmxIwoGz i8Aw== X-Received: by 10.236.27.196 with SMTP id e44mr24796754yha.16.1378852629898; Tue, 10 Sep 2013 15:37:09 -0700 (PDT) Received: from localhost.localdomain ([186.204.164.107]) by mx.google.com with ESMTPSA id v22sm27925176yhn.12.1969.12.31.16.00.00 (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Tue, 10 Sep 2013 15:37:09 -0700 (PDT) From: Rodrigo Vivi To: intel-gfx@lists.freedesktop.org Date: Tue, 10 Sep 2013 19:36:34 -0300 Message-Id: <1378852608-30281-6-git-send-email-rodrigo.vivi@gmail.com> X-Mailer: git-send-email 1.8.1.4 In-Reply-To: <1378852608-30281-1-git-send-email-rodrigo.vivi@gmail.com> References: <1378852608-30281-1-git-send-email-rodrigo.vivi@gmail.com> Subject: [Intel-gfx] [PATCH 05/19] drm/i915: Asynchronously perform the set-base for a simple modeset X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: intel-gfx-bounces+patchwork-intel-gfx=patchwork.kernel.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+patchwork-intel-gfx=patchwork.kernel.org@lists.freedesktop.org X-Spam-Status: No, score=-4.7 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Chris Wilson A simple modeset, where we only wish to switch over to a new framebuffer such as the transition from fbcon to X, takes around 30-60ms. This is due to three factors: 1. We need to make sure the fb->obj is in the display domain, which incurs a cache flush to ensure no dirt is left on the scanout. 2. We need to flush any pending rendering before performing the mmio so that the frame is complete before it is shown. 3. We currently wait for the vblank after the mmio to be sure that the old fb is no longer being shown before releasing it. (1) can only be eliminated by userspace preparing the fb->obj in advance to already be in the display domain. This can be done through use of the create2 ioctl, or by reusing an existing fb->obj. However, (2) and (3) are already solved by the existing page flip mechanism, and it is surprisingly trivial to wire them up for use in the set-base fast path. Though it can be argued that this represents a subtle ABI break in that the set_config ioctl now returns before the old framebuffer is unpinned. The danger is that userspace will start to modify it before it is no longer being shown, however we should be able to prevent that through proper domain tracking. By combining all of the above, we can achieve an instaneous set_config: [ 6.601] (II) intel(0): switch to mode 2560x1440@60.0 on pipe 0 using DP2, position (0, 0), rotation normal [ 6.601] (II) intel(0): Setting screen physical size to 677 x 381 v2 (by Vivi): page_flip_flag was added to intel_crtc_page_flip in a previous commit. using 0. Signed-off-by: Chris Wilson Signed-off-by: Rodrigo Vivi --- drivers/gpu/drm/i915/intel_display.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 86a70d9..c99dc1d 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -9264,10 +9264,13 @@ static int intel_crtc_set_config(struct drm_mode_set *set) ret = intel_set_mode(set->crtc, set->mode, set->x, set->y, set->fb); } else if (config->fb_changed) { - intel_crtc_wait_for_pending_flips(set->crtc); - - ret = intel_pipe_set_base(set->crtc, - set->x, set->y, set->fb); + if (to_intel_framebuffer(set->fb)->obj->ring == NULL || + save_set.x != set->x || save_set.y != set->y || + intel_crtc_page_flip(set->crtc, set->fb, NULL, 0)) { + intel_crtc_wait_for_pending_flips(set->crtc); + ret = intel_pipe_set_base(set->crtc, + set->x, set->y, set->fb); + } } if (ret) {