From patchwork Sat Nov 19 02:50:38 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Navare, Manasi" X-Patchwork-Id: 9437765 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 319D26021C for ; Sat, 19 Nov 2016 02:48:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0991E299C0 for ; Sat, 19 Nov 2016 02:48:44 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F2BCC299D7; Sat, 19 Nov 2016 02:48:43 +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=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=unavailable 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 7F0AE299C0 for ; Sat, 19 Nov 2016 02:48:43 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id AA7376E2C7; Sat, 19 Nov 2016 02:48:30 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by gabe.freedesktop.org (Postfix) with ESMTPS id 598856E248; Sat, 19 Nov 2016 02:48:23 +0000 (UTC) Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga102.jf.intel.com with ESMTP; 18 Nov 2016 18:48:22 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,513,1473145200"; d="scan'208";a="33057638" Received: from manasi-otcmedia.jf.intel.com ([10.7.199.175]) by orsmga005.jf.intel.com with ESMTP; 18 Nov 2016 18:48:22 -0800 From: Manasi Navare To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH v8 5/5] drm/i915: Implement Link Rate fallback on Link training failure Date: Fri, 18 Nov 2016 18:50:38 -0800 Message-Id: <1479523838-31031-4-git-send-email-manasi.d.navare@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1479523838-31031-1-git-send-email-manasi.d.navare@intel.com> References: <1479523838-31031-1-git-send-email-manasi.d.navare@intel.com> In-Reply-To: <1479453200-27705-6-git-send-email-manasi.d.navare@intel.com> References: <1479453200-27705-6-git-send-email-manasi.d.navare@intel.com> Cc: Manasi Navare , Daniel Vetter X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP If link training at a link rate optimal for a particular mode fails during modeset's atomic commit phase, then we let the modeset complete and then retry. We save the link rate value at which link training failed, update the link status property to "BAD" and use a lower link rate to prune the modes. It will redo the modeset on the current mode at lower link rate or if the current mode gets pruned due to lower link constraints then, it will send a hotplug uevent for userspace to handle it. This is also required to pass DP CTS tests 4.3.1.3, 4.3.1.4, 4.3.1.6. v8: * Set link_status to BAD first and then call mode_valid (Jani Nikula) v7: Remove the redundant variable in previous patch itself v6: * Obtain link rate index from fallback_link_rate using the helper intel_dp_link_rate_index (Jani Nikula) * Include fallback within intel_dp_start_link_train (Jani Nikula) v5: * Move set link status to drm core (Daniel Vetter, Jani Nikula) v4: * Add fallback support for non DDI platforms too * Set connector->link status inside set_link_status function (Jani Nikula) v3: * Set link status property to BAd unconditionally (Jani Nikula) * Dont use two separate variables link_train_failed and link_status to indicate same thing (Jani Nikula) v2: * Squashed a few patches (Jani Nikula) Acked-by: Tony Cheng Acked-by: Harry Wentland Cc: Jani Nikula Cc: Daniel Vetter Cc: Ville Syrjala Signed-off-by: Manasi Navare --- drivers/gpu/drm/i915/intel_dp.c | 63 ++++++++++++++++++++++++++- drivers/gpu/drm/i915/intel_dp_link_training.c | 28 +++++++++++- drivers/gpu/drm/i915/intel_drv.h | 3 ++ 3 files changed, 90 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 3a72014..747a2ba 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -351,8 +351,14 @@ int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp, target_clock = fixed_mode->clock; } - max_link_clock = intel_dp_max_link_rate(intel_dp); - max_lanes = intel_dp_max_lane_count(intel_dp); + /* Prune the modes using the fallback link rate/lane count */ + if (connector->link_status == DRM_MODE_LINK_STATUS_BAD) { + max_link_clock = intel_dp->fallback_link_rate; + max_lanes = intel_dp->fallback_lane_count; + } else { + max_link_clock = intel_dp_max_link_rate(intel_dp); + max_lanes = intel_dp_max_lane_count(intel_dp); + } max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes); mode_rate = intel_dp_link_required(target_clock, 18); @@ -1588,6 +1594,7 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp, enum port port = dp_to_dig_port(intel_dp)->port; struct intel_crtc *intel_crtc = to_intel_crtc(pipe_config->base.crtc); struct intel_connector *intel_connector = intel_dp->attached_connector; + struct drm_connector *connector = &intel_connector->base; int lane_count, clock; int min_lane_count = 1; int max_lane_count = intel_dp_max_lane_count(intel_dp); @@ -1635,6 +1642,14 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp, if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK) return false; + /* Fall back to lower link rate in case of failure in previous modeset */ + if (connector->link_status == DRM_MODE_LINK_STATUS_BAD) { + min_lane_count = max_lane_count = intel_dp->fallback_lane_count; + min_clock = max_clock = intel_dp_link_rate_index(intel_dp, + common_rates, + intel_dp->fallback_link_rate); + } + DRM_DEBUG_KMS("DP link computation with max lane count %i " "max bw %d pixel clock %iKHz\n", max_lane_count, common_rates[max_clock], @@ -4415,6 +4430,10 @@ static bool intel_digital_port_connected(struct drm_i915_private *dev_priv, intel_dp->compliance_test_active = 0; intel_dp->compliance_test_type = 0; intel_dp->compliance_test_data = 0; + intel_dp->fallback_link_rate = 0; + intel_dp->fallback_lane_count = 0; + drm_mode_connector_set_link_status_property(connector, + DRM_MODE_LINK_STATUS_GOOD); if (intel_dp->is_mst) { DRM_DEBUG_KMS("MST device may have disappeared %d vs %d\n", @@ -4506,6 +4525,11 @@ static bool intel_digital_port_connected(struct drm_i915_private *dev_priv, DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, connector->name); + /* If this is a retry due to link trianing failure */ + if (status == connector_status_connected && + connector->link_status == DRM_MODE_LINK_STATUS_BAD) + return status; + /* If full detect is not performed yet, do a full detect */ if (!intel_dp->detect_done) status = intel_dp_long_pulse(intel_dp->attached_connector); @@ -5671,6 +5695,37 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp, return false; } +static void intel_dp_modeset_retry_work_fn(struct work_struct *work) +{ + struct intel_connector *intel_connector; + struct drm_connector *connector; + struct drm_display_mode *mode; + bool verbose_prune = true; + + intel_connector = container_of(work, typeof(*intel_connector), + modeset_retry_work); + connector = &intel_connector->base; + DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, + connector->name); + + /* Grab the locks before changing connector property*/ + mutex_lock(&connector->dev->mode_config.mutex); + /* Set connector link status to BAD and send a Uevent to notify + * userspace to do a modeset. + */ + drm_mode_connector_set_link_status_property(connector, + DRM_MODE_LINK_STATUS_BAD); + list_for_each_entry(mode, &connector->modes, head) { + mode->status = intel_dp_mode_valid(connector, + mode); + } + drm_mode_prune_invalid(connector->dev, &connector->modes, + verbose_prune); + mutex_unlock(&connector->dev->mode_config.mutex); + /* Send Hotplug uevent so userspace can reprobe */ + drm_kms_helper_hotplug_event(connector->dev); +} + bool intel_dp_init_connector(struct intel_digital_port *intel_dig_port, struct intel_connector *intel_connector) @@ -5683,6 +5738,10 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp, enum port port = intel_dig_port->port; int type; + /* Initialize the work for modeset in case of link train failure */ + INIT_WORK(&intel_connector->modeset_retry_work, + intel_dp_modeset_retry_work_fn); + if (WARN(intel_dig_port->max_lanes < 1, "Not enough lanes (%d) for DP on port %c\n", intel_dig_port->max_lanes, port_name(port))) diff --git a/drivers/gpu/drm/i915/intel_dp_link_training.c b/drivers/gpu/drm/i915/intel_dp_link_training.c index 0048b52..cc243db 100644 --- a/drivers/gpu/drm/i915/intel_dp_link_training.c +++ b/drivers/gpu/drm/i915/intel_dp_link_training.c @@ -313,6 +313,30 @@ void intel_dp_stop_link_train(struct intel_dp *intel_dp) void intel_dp_start_link_train(struct intel_dp *intel_dp) { - intel_dp_link_training_clock_recovery(intel_dp); - intel_dp_link_training_channel_equalization(intel_dp); + struct intel_connector *intel_connector = intel_dp->attached_connector; + struct drm_connector *connector = &intel_connector->base; + + if (!intel_dp_link_training_clock_recovery(intel_dp)) + goto failure_handling; + if (!intel_dp_link_training_channel_equalization(intel_dp)) + goto failure_handling; + + /* Reset the Link Train Values */ + DRM_DEBUG_KMS("Link Training Passed at Link Rate = %d, Lane count = %d", + intel_dp->link_rate, intel_dp->lane_count); + intel_dp->fallback_link_rate = 0; + intel_dp->fallback_lane_count = 0; + drm_mode_connector_set_link_status_property(connector, + DRM_MODE_LINK_STATUS_GOOD); + return; + + failure_handling: + DRM_DEBUG_KMS("Link Training failed at link rate = %d, lane count = %d", + intel_dp->link_rate, intel_dp->lane_count); + if (!intel_dp_get_link_train_fallback_values(intel_dp, + intel_dp->link_rate, + intel_dp->lane_count)) + /* Schedule a Hotplug Uevent to userspace to start modeset */ + schedule_work(&intel_connector->modeset_retry_work); + return; } diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index e1c43a9..33be66f 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -315,6 +315,9 @@ struct intel_connector { void *port; /* store this opaque as its illegal to dereference it */ struct intel_dp *mst_port; + + /* Work struct to schedule a uevent on link train failure */ + struct work_struct modeset_retry_work; }; struct dpll {