From patchwork Thu Nov 10 04:42:07 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Navare, Manasi" X-Patchwork-Id: 9420607 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 539C06048E for ; Thu, 10 Nov 2016 04:40:36 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 43A382939E for ; Thu, 10 Nov 2016 04:40:36 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3754A2949A; Thu, 10 Nov 2016 04:40:36 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.7 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RCVD_IN_SORBS_SPAM autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id D7BF92939E for ; Thu, 10 Nov 2016 04:40:35 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 96AB56E76B; Thu, 10 Nov 2016 04:40:32 +0000 (UTC) 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 ESMTPS id 9C1DF6E135; Thu, 10 Nov 2016 04:40:30 +0000 (UTC) Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga103.jf.intel.com with ESMTP; 09 Nov 2016 20:40:29 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,617,1473145200"; d="scan'208";a="899805070" Received: from manasi-otcmedia.jf.intel.com ([10.7.199.175]) by orsmga003.jf.intel.com with ESMTP; 09 Nov 2016 20:40:29 -0800 From: Manasi Navare To: dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Date: Wed, 9 Nov 2016 20:42:07 -0800 Message-Id: <1478752928-17719-5-git-send-email-manasi.d.navare@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1478752928-17719-1-git-send-email-manasi.d.navare@intel.com> References: <1478752928-17719-1-git-send-email-manasi.d.navare@intel.com> Cc: Daniel Vetter Subject: [Intel-gfx] [PATCH 4/5] drm/i915: Find fallback link rate/lane count 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-Virus-Scanned: ClamAV using ClamSMTP If link training fails, then we need to fallback to lower link rate first and if link training fails at RBR, then fallback to lower lane count. This function finds the next lower link rate/lane count value after link training failure. v2: Squash the patch that returns the link rate index (Jani Nikula) Cc: Ville Syrjala Cc: Jani Nikula Cc: Daniel Vetter Signed-off-by: Manasi Navare --- drivers/gpu/drm/i915/intel_dp.c | 42 ++++++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/i915/intel_drv.h | 6 ++++++ 2 files changed, 48 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 1f1760f..9694857 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -288,6 +288,48 @@ static int intel_dp_common_rates(struct intel_dp *intel_dp, common_rates); } +static int intel_dp_link_rate_index(struct intel_dp *intel_dp, + int *common_rates, int link_rate) +{ + int common_len; + int index; + + common_len = intel_dp_common_rates(intel_dp, common_rates); + for (index = 0; index < common_len; index++) { + if (link_rate == common_rates[common_len - index - 1]) + return common_len - index - 1; + } + + return -1; +} + +int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp, + int link_rate, uint8_t lane_count) +{ + int common_rates[DP_MAX_SUPPORTED_RATES] = {}; + int common_len; + int link_rate_index = -1; + + common_len = intel_dp_common_rates(intel_dp, common_rates); + link_rate_index = intel_dp_link_rate_index(intel_dp, + common_rates, + link_rate); + if (link_rate_index > 0) { + intel_dp->fallback_link_rate_index = link_rate_index - 1; + intel_dp->fallback_link_rate = common_rates[intel_dp->fallback_link_rate_index]; + intel_dp->fallback_lane_count = intel_dp_max_lane_count(intel_dp); + } else if (lane_count > 1) { + intel_dp->fallback_link_rate_index = common_len - 1; + intel_dp->fallback_link_rate = common_rates[intel_dp->fallback_link_rate_index]; + intel_dp->fallback_lane_count = lane_count >> 1; + } else { + DRM_ERROR("Link Training Unsuccessful\n"); + return -1; + } + + return 0; +} + static enum drm_mode_status intel_dp_mode_valid(struct drm_connector *connector, struct drm_display_mode *mode) diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 856dd41..4a49a2d 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -888,6 +888,10 @@ struct intel_dp { uint32_t DP; int link_rate; uint8_t lane_count; + int fallback_link_rate; + uint8_t fallback_lane_count; + int fallback_link_rate_index; + bool link_train_failed; uint8_t sink_count; bool link_mst; bool has_audio; @@ -1386,6 +1390,8 @@ int intel_dp_set_link_status_property(struct drm_connector *connector, void intel_dp_set_link_params(struct intel_dp *intel_dp, int link_rate, uint8_t lane_count, bool link_mst); +int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp, + int link_rate, uint8_t lane_count); void intel_dp_start_link_train(struct intel_dp *intel_dp); void intel_dp_stop_link_train(struct intel_dp *intel_dp); void intel_dp_sink_dpms(struct intel_dp *intel_dp, int mode);