From patchwork Tue Jan 17 22:57:12 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Navare, Manasi" X-Patchwork-Id: 9522081 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 F359E601C3 for ; Tue, 17 Jan 2017 22:53:27 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EC47D285D1 for ; Tue, 17 Jan 2017 22:53:27 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E0B00285F0; Tue, 17 Jan 2017 22:53:27 +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 63F98285D1 for ; Tue, 17 Jan 2017 22:53:27 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id D3C346E7A5; Tue, 17 Jan 2017 22:53:12 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by gabe.freedesktop.org (Postfix) with ESMTPS id 03F256E79A; Tue, 17 Jan 2017 22:53:09 +0000 (UTC) Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga104.fm.intel.com with ESMTP; 17 Jan 2017 14:53:09 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.33,246,1477983600"; d="scan'208";a="31866519" Received: from manasi-otcmedia.jf.intel.com ([10.7.199.175]) by orsmga002.jf.intel.com with ESMTP; 17 Jan 2017 14:53:09 -0800 From: Manasi Navare To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH 1/4] drm/i915: Add support for DP link training compliance Date: Tue, 17 Jan 2017 14:57:12 -0800 Message-Id: <1484693835-32269-2-git-send-email-manasi.d.navare@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1484693835-32269-1-git-send-email-manasi.d.navare@intel.com> References: <1484693835-32269-1-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 This patch adds support to handle automated DP compliance link training test requests. This patch has been tested with Unigraf DPR-120 DP Compliance device for testing Link Training Compliance. After we get a short pulse Compliance test request, test request values are read and hotplug uevent is sent in order to trigger another modeset during which the pipe is configured and link is retrained and enabled for link parameters requested by the test. v2: * Validate the test lane count before using it in intel_dp_compute_config (Jani Nikula) Signed-off-by: Manasi Navare Cc: Jani Nikula Cc: Daniel Vetter Cc: Ville Syrjala --- drivers/gpu/drm/i915/intel_dp.c | 46 ++++++++++++++++++++++++++++++++++++---- drivers/gpu/drm/i915/intel_drv.h | 2 ++ 2 files changed, 44 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index e80d620..7a1d3c4 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1613,6 +1613,7 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp, /* Conveniently, the link BW constants become indices with a shift...*/ int min_clock = 0; int max_clock; + int link_rate_index; int bpp, mode_rate; int link_avail, link_clock; int common_rates[DP_MAX_SUPPORTED_RATES] = {}; @@ -1654,6 +1655,17 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp, if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK) return false; + /* Use values requested by Compliance Test Request */ + if (intel_dp->compliance.test_type == DP_TEST_LINK_TRAINING) { + link_rate_index = intel_dp_link_rate_index(intel_dp, + common_rates, + drm_dp_bw_code_to_link_rate(intel_dp->compliance.test_link_rate)); + if (link_rate_index >= 0) + min_clock = max_clock = link_rate_index; + if (min_lane_count <= intel_dp->compliance.test_lane_count + && intel_dp->compliance.test_lane_count >= max_lane_count) + min_lane_count = max_lane_count = intel_dp->compliance.test_lane_count; + } 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], @@ -3921,6 +3933,27 @@ int intel_dp_sink_crc(struct intel_dp *intel_dp, u8 *crc) static uint8_t intel_dp_autotest_link_training(struct intel_dp *intel_dp) { uint8_t test_result = DP_TEST_ACK; + int status = 0; + /* (DP CTS 1.2) + * 4.3.1.11 + */ + /* Read the TEST_LANE_COUNT and TEST_LINK_RTAE fields (DP CTS 3.1.4) */ + status = drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_LANE_COUNT, + &intel_dp->compliance.test_lane_count); + + if (status <= 0) { + DRM_DEBUG_KMS("Lane count read failed\n"); + return 0; + } + intel_dp->compliance.test_lane_count &= DP_MAX_LANE_COUNT_MASK; + + status = drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_LINK_RATE, + &intel_dp->compliance.test_link_rate); + if (status <= 0) { + DRM_DEBUG_KMS("Link Rate read failed\n"); + return 0; + } + return test_result; } @@ -4135,9 +4168,8 @@ static void intel_dp_handle_test_request(struct intel_dp *intel_dp) if (!intel_dp->lane_count) return; - /* if link training is requested we should perform it always */ - if ((intel_dp->compliance.test_type == DP_TEST_LINK_TRAINING) || - (!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count))) { + /* Retrain if Channel EQ or CR not ok */ + if (!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) { DRM_DEBUG_KMS("%s: channel EQ not ok, retraining\n", intel_encoder->base.name); @@ -4162,6 +4194,7 @@ static void intel_dp_handle_test_request(struct intel_dp *intel_dp) intel_dp_short_pulse(struct intel_dp *intel_dp) { struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct intel_encoder *intel_encoder = &dp_to_dig_port(intel_dp)->base; u8 sink_irq_vector = 0; u8 old_sink_count = intel_dp->sink_count; bool ret; @@ -4195,7 +4228,7 @@ static void intel_dp_handle_test_request(struct intel_dp *intel_dp) sink_irq_vector); if (sink_irq_vector & DP_AUTOMATED_TEST_REQUEST) - DRM_DEBUG_DRIVER("Test request in short pulse not handled\n"); + intel_dp_handle_test_request(intel_dp); if (sink_irq_vector & (DP_CP_IRQ | DP_SINK_SPECIFIC_IRQ)) DRM_DEBUG_DRIVER("CP or sink specific irq unhandled\n"); } @@ -4203,6 +4236,11 @@ static void intel_dp_handle_test_request(struct intel_dp *intel_dp) drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); intel_dp_check_link_status(intel_dp); drm_modeset_unlock(&dev->mode_config.connection_mutex); + if (intel_dp->compliance.test_type == DP_TEST_LINK_TRAINING) { + DRM_DEBUG_KMS("Link Training Compliance Test requested\n"); + /* Send a Hotplug Uevent to userspace to start modeset */ + drm_kms_helper_hotplug_event(intel_encoder->base.dev); + } return true; } diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 84258df..7a2eb76 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -893,6 +893,8 @@ struct intel_dp_compliance { unsigned long test_type; struct intel_dp_compliance_data test_data; bool test_active; + u8 test_link_rate; + u8 test_lane_count; }; struct intel_dp {