From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756592Ab1HFRyT (ORCPT ); Sat, 6 Aug 2011 13:54:19 -0400 Received: from home.keithp.com ([63.227.221.253]:41187 "EHLO keithp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756348Ab1HFRyR (ORCPT ); Sat, 6 Aug 2011 13:54:17 -0400 From: Keith Packard To: Dave Airlie Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, Keith Packard Subject: [PATCH 1/4] drm/i915: Wait for LVDS panel power sequence Date: Sat, 6 Aug 2011 10:54:05 -0700 Message-Id: <1312653248-3487-2-git-send-email-keithp@keithp.com> X-Mailer: git-send-email 1.7.5.4 In-Reply-To: <1312653248-3487-1-git-send-email-keithp@keithp.com> References: <1312653248-3487-1-git-send-email-keithp@keithp.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org During mode setting, check to make sure the panel power sequencing has completed before doing further operations on the device. This uncovered errors with DPMS not turning the device off as it was left locked. Signed-off-by: Keith Packard --- drivers/gpu/drm/i915/intel_lvds.c | 13 +++++++++++-- 1 files changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c index 2e8ddfc..6985e42 100644 --- a/drivers/gpu/drm/i915/intel_lvds.c +++ b/drivers/gpu/drm/i915/intel_lvds.c @@ -72,14 +72,16 @@ static void intel_lvds_enable(struct intel_lvds *intel_lvds) { struct drm_device *dev = intel_lvds->base.base.dev; struct drm_i915_private *dev_priv = dev->dev_private; - u32 ctl_reg, lvds_reg; + u32 ctl_reg, lvds_reg, stat_reg; if (HAS_PCH_SPLIT(dev)) { ctl_reg = PCH_PP_CONTROL; lvds_reg = PCH_LVDS; + stat_reg = PCH_PP_STATUS; } else { ctl_reg = PP_CONTROL; lvds_reg = LVDS; + stat_reg = PP_STATUS; } I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN); @@ -105,6 +107,8 @@ static void intel_lvds_enable(struct intel_lvds *intel_lvds) I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON); POSTING_READ(lvds_reg); + if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000)) + DRM_ERROR("timed out waiting for panel to power on\n"); intel_panel_enable_backlight(dev); } @@ -113,19 +117,24 @@ static void intel_lvds_disable(struct intel_lvds *intel_lvds) { struct drm_device *dev = intel_lvds->base.base.dev; struct drm_i915_private *dev_priv = dev->dev_private; - u32 ctl_reg, lvds_reg; + u32 ctl_reg, lvds_reg, stat_reg; if (HAS_PCH_SPLIT(dev)) { ctl_reg = PCH_PP_CONTROL; lvds_reg = PCH_LVDS; + stat_reg = PCH_PP_STATUS; } else { ctl_reg = PP_CONTROL; lvds_reg = LVDS; + stat_reg = PP_STATUS; } intel_panel_disable_backlight(dev); I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON); + if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000)) + DRM_ERROR("timed out waiting for panel to power off status 0x%08x control 0x%08x\n", + I915_READ(PCH_PP_STATUS), I915_READ(PCH_PP_CONTROL)); if (intel_lvds->pfit_control) { if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000)) -- 1.7.5.4