Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753306AbcKGNHD (ORCPT ); Mon, 7 Nov 2016 08:07:03 -0500 Received: from mx2.suse.de ([195.135.220.15]:37011 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753192AbcKGNFy (ORCPT ); Mon, 7 Nov 2016 08:05:54 -0500 X-Amavis-Alert: BAD HEADER SECTION, Duplicate header field: "References" From: Jiri Slaby To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Alex Deucher , Jiri Slaby Subject: [PATCH 3.12 58/72] drm/radeon: change vblank_time's calculation method to reduce computational error. Date: Mon, 7 Nov 2016 14:05:05 +0100 Message-Id: <54a5d1c058079c6309cbb583a4981fb6af183854.1478523828.git.jslaby@suse.cz> X-Mailer: git-send-email 2.10.2 In-Reply-To: <0f3caac741164dcff670ae0f4d1cfcb0a7026a1c.1478523828.git.jslaby@suse.cz> References: <0f3caac741164dcff670ae0f4d1cfcb0a7026a1c.1478523828.git.jslaby@suse.cz> In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1813 Lines: 50 From: Alex Deucher 3.12-stable review patch. If anyone has any objections, please let me know. =============== commit 02cfb5fccb0f9f968f0e208d89d9769aa16267bc upstream. Ported from Rex's amdgpu change. Signed-off-by: Alex Deucher Signed-off-by: Jiri Slaby --- drivers/gpu/drm/radeon/r600_dpm.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/radeon/r600_dpm.c b/drivers/gpu/drm/radeon/r600_dpm.c index 729ad831886f..d52ab40369b6 100644 --- a/drivers/gpu/drm/radeon/r600_dpm.c +++ b/drivers/gpu/drm/radeon/r600_dpm.c @@ -155,19 +155,20 @@ u32 r600_dpm_get_vblank_time(struct radeon_device *rdev) struct drm_device *dev = rdev->ddev; struct drm_crtc *crtc; struct radeon_crtc *radeon_crtc; - u32 line_time_us, vblank_lines; + u32 vblank_in_pixels; u32 vblank_time_us = 0xffffffff; /* if the displays are off, vblank time is max */ if (rdev->num_crtc && rdev->mode_info.mode_config_initialized) { list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { radeon_crtc = to_radeon_crtc(crtc); if (crtc->enabled && radeon_crtc->enabled && radeon_crtc->hw_mode.clock) { - line_time_us = (radeon_crtc->hw_mode.crtc_htotal * 1000) / - radeon_crtc->hw_mode.clock; - vblank_lines = radeon_crtc->hw_mode.crtc_vblank_end - - radeon_crtc->hw_mode.crtc_vdisplay + - (radeon_crtc->v_border * 2); - vblank_time_us = vblank_lines * line_time_us; + vblank_in_pixels = + radeon_crtc->hw_mode.crtc_htotal * + (radeon_crtc->hw_mode.crtc_vblank_end - + radeon_crtc->hw_mode.crtc_vdisplay + + (radeon_crtc->v_border * 2)); + + vblank_time_us = vblank_in_pixels * 1000 / radeon_crtc->hw_mode.clock; break; } } -- 2.10.2