From patchwork Tue Nov 17 07:43:29 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhao, Yakui" X-Patchwork-Id: 60591 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id nAH7kLQV011932 for ; Tue, 17 Nov 2009 07:46:21 GMT Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 528E89EFFA; Mon, 16 Nov 2009 23:46:21 -0800 (PST) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTP id E293D9EC6D for ; Mon, 16 Nov 2009 23:46:13 -0800 (PST) Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga101.jf.intel.com with ESMTP; 16 Nov 2009 23:31:52 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.44,757,1249282800"; d="scan'208";a="467968074" Received: from yakui_zhao.sh.intel.com (HELO localhost.localdomain) ([10.239.13.99]) by orsmga002.jf.intel.com with ESMTP; 17 Nov 2009 00:03:19 -0800 From: yakui.zhao@intel.com To: intel-gfx@lists.freedesktop.org Date: Tue, 17 Nov 2009 15:43:29 +0800 Message-Id: <1258443810-13543-4-git-send-email-yakui.zhao@intel.com> X-Mailer: git-send-email 1.5.4.5 In-Reply-To: <1258443810-13543-3-git-send-email-yakui.zhao@intel.com> References: <1258443810-13543-1-git-send-email-yakui.zhao@intel.com> <1258443810-13543-2-git-send-email-yakui.zhao@intel.com> <1258443810-13543-3-git-send-email-yakui.zhao@intel.com> Subject: [Intel-gfx] [RFC PATCH 4/5] DRM/I915: Use the child device to decide whether the LVDS should be intialized X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.9 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@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c index b1e3af7..74f9f9d 100644 --- a/drivers/gpu/drm/i915/intel_lvds.c +++ b/drivers/gpu/drm/i915/intel_lvds.c @@ -913,6 +913,44 @@ static int intel_lid_present(void) } #endif + +/* + * Enumerate the child dev array parsed from VBT to check whether + * the LVDS is present. + * If it is present, return 1. + * If it is not present, return false. + * If no child dev is parsed from VBT, it assumes that the LVDS is present. + * Note: The addin_offset should also be checked for LVDS panel. + * Only when it is non-zero, it is assumed that it is present. + */ +int lvds_is_present_in_vbt(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + struct child_device_config *p_child; + int i, ret; + + if (!dev_priv->child_dev_num) + return 1; + + ret = 0; + for (i = 0; i < dev_priv->child_dev_num; i++) { + p_child = dev_priv->child_dev + i; + /* + * If the device type is not LFP, continue. + */ + if (p_child->device_type != INT_LFP_CLASS) + continue; + /* The addin_offset should be checked. Only when it is + * non-zero, it is regarded as present. + */ + if (p_child->addin_offset) { + ret = 1; + break; + } + } + return ret; +} + /** * intel_lvds_init - setup LVDS connectors on this device * @dev: drm device @@ -936,6 +974,10 @@ void intel_lvds_init(struct drm_device *dev) if (dmi_check_system(intel_no_lvds)) return; + if (!lvds_is_present_in_vbt(dev)) { + DRM_DEBUG_KMS("LVDS is not present in VBT\n"); + return; + } /* Assume that any device without an ACPI LID device also doesn't * have an integrated LVDS. We would be better off parsing the BIOS * to get a reliable indicator, but that code isn't written yet.