From patchwork Mon Nov 2 12:55:15 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shubhangi Shrivastava X-Patchwork-Id: 7536121 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id B58339FC5D for ; Mon, 2 Nov 2015 12:52:45 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E23DB205F7 for ; Mon, 2 Nov 2015 12:52:44 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 06C06205EB for ; Mon, 2 Nov 2015 12:52:44 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 604496E545; Mon, 2 Nov 2015 04:52:42 -0800 (PST) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by gabe.freedesktop.org (Postfix) with ESMTP id 91B6E6E544 for ; Mon, 2 Nov 2015 04:52:34 -0800 (PST) Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga103.jf.intel.com with ESMTP; 02 Nov 2015 04:52:35 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,234,1444719600"; d="scan'208";a="840597469" Received: from shubhangi-desktop.iind.intel.com ([10.223.25.29]) by orsmga002.jf.intel.com with ESMTP; 02 Nov 2015 04:52:33 -0800 From: Shubhangi Shrivastava To: intel-gfx@lists.freedesktop.org Date: Mon, 2 Nov 2015 18:25:15 +0530 Message-Id: <1446468916-25295-6-git-send-email-shubhangi.shrivastava@intel.com> X-Mailer: git-send-email 2.6.1 In-Reply-To: <1446468916-25295-1-git-send-email-shubhangi.shrivastava@intel.com> References: <1446468916-25295-1-git-send-email-shubhangi.shrivastava@intel.com> Cc: Shubhangi Shrivastava Subject: [Intel-gfx] [PATCH 5/6] drm/i915: read sink_count dpcd always X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_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 X-Virus-Scanned: ClamAV using ClamSMTP This patch reads sink_count dpcd always and removes its read operation based on values in downstream port dpcd. SINK_COUNT dpcd is not dependent on DOWNSTREAM_PORT_PRESENT dpcd. SINK_COUNT denotes if a display is attached, while DOWNSTREAM_PORT_PRESET indicates how many ports are available in the dongle where display can be attached. so it is possible for sink count to change irrespective of value in downstream port dpcd. Here is a table of possible values and scenarios sink_count downstream_port present 0 0 no display is attached 0 1 dongle is connected without display 1 0 display connected directly 1 1 display connected through dongle v2: moved out crtc enabled checks to prior patch(Jani) Signed-off-by: Sivakumar Thulasimani Signed-off-by: Shubhangi Shrivastava --- drivers/gpu/drm/i915/intel_dp.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index e15d42b..9a22bec 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -3988,6 +3988,13 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp) if (intel_dp->dpcd[DP_DPCD_REV] == 0) return false; /* DPCD not present */ + if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_SINK_COUNT, + &intel_dp->sink_count, 1) < 0) + return false; + + if (!DP_GET_SINK_COUNT(intel_dp->sink_count)) + return false; + /* Check if the panel supports PSR */ memset(intel_dp->psr_dpcd, 0, sizeof(intel_dp->psr_dpcd)); if (is_edp(intel_dp)) { @@ -4509,10 +4516,6 @@ intel_dp_detect_dpcd(struct intel_dp *intel_dp) if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 && intel_dp->downstream_ports[0] & DP_DS_PORT_HPD) { - if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_SINK_COUNT, - &intel_dp->sink_count, 1) < 0) - return connector_status_unknown; - return DP_GET_SINK_COUNT(intel_dp->sink_count) ? connector_status_connected : connector_status_disconnected; }