From patchwork Mon Jul 14 19:10:45 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Todd Previte X-Patchwork-Id: 4548761 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 8DE9CC0514 for ; Mon, 14 Jul 2014 19:11:39 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B25DD2011E for ; Mon, 14 Jul 2014 19:11:38 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id D6C442015E for ; Mon, 14 Jul 2014 19:11:37 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 6EA776E46B; Mon, 14 Jul 2014 12:11:37 -0700 (PDT) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mail-pd0-f171.google.com (mail-pd0-f171.google.com [209.85.192.171]) by gabe.freedesktop.org (Postfix) with ESMTP id 44DDA6E46D for ; Mon, 14 Jul 2014 12:11:35 -0700 (PDT) Received: by mail-pd0-f171.google.com with SMTP id z10so3471993pdj.30 for ; Mon, 14 Jul 2014 12:11:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=JA37ZLhEj5CvMBQKo3EQ+sNfCXHIJvzBunSXfLNNVAI=; b=JwdsGI2E/MbUgeAMWBrPu5LoZpuvYe0YD/KJyodzxfVpWTiZ4hn9LbUNs3i6DJNTn2 q1mNy4+kemPd2n/HNBUL1RJE/+gEeM5k+kVRVnnr2EijfOdVV63C2S2Sp1l4DpwsBVuZ UQrCE8/u/Fy42hXCZhjAHLOop0ReuSHJv/T0OQo7ThgammPhfsyrMbEJkAmKH83ziiNI Jdc/qslLJvH7tMRu8pPQMFegNIUvDOsd1gPREHyRtjlwE8Qwm+IxHurhkvhEJ9ijMSo6 I+SNEjiYwPDb5t8AFVxWnUFPI9e0B0RifiVnEili8XqUomFl7GcybuEMriExVyMofCoZ ovag== X-Received: by 10.69.3.67 with SMTP id bu3mr18193640pbd.34.1405365095173; Mon, 14 Jul 2014 12:11:35 -0700 (PDT) Received: from localhost.localdomain (ip72-201-95-47.ph.ph.cox.net. [72.201.95.47]) by mx.google.com with ESMTPSA id z5sm8049888pbt.81.2014.07.14.12.11.33 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 14 Jul 2014 12:11:34 -0700 (PDT) From: Todd Previte To: intel-gfx@lists.freedesktop.org Date: Mon, 14 Jul 2014 12:10:45 -0700 Message-Id: <1405365047-6866-11-git-send-email-tprevite@gmail.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1405365047-6866-1-git-send-email-tprevite@gmail.com> References: <1405365047-6866-1-git-send-email-tprevite@gmail.com> Subject: [Intel-gfx] [PATCH 10/12] drm/i915: Update link training automated test function for Displayport compliance X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.15 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=-4.1 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=ham 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 Implements basic link training functionality for Displayport automated compliance testing. Signed-off-by: Todd Previte --- drivers/gpu/drm/i915/intel_dp.c | 47 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 65830e9..e4b31ad 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -3427,6 +3427,53 @@ static uint8_t intel_dp_autotest_link_training(struct intel_dp *intel_dp) { uint8_t test_result = DP_TEST_NAK; + uint8_t rxdata[2]; + uint8_t link_status[DP_LINK_STATUS_SIZE]; + int bytes_ret = 0; + struct drm_connector *connector = &intel_dp->attached_connector->base; + struct intel_digital_port *intel_dig_port = + enc_to_dig_port(&intel_dp->attached_connector->encoder->base); + + /* Read test parameters */ + bytes_ret = drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_LINK_RATE, rxdata, 2); + + /* Set link rate directly */ + intel_dp->link_bw = rxdata[0]; + /* Preserve 7:5 when setting lane count */ + intel_dp->lane_count &= 0xE0; + intel_dp->lane_count |= rxdata[1]; + + DRM_DEBUG_KMS("Displayport: Link training testing - %d lanes @ %02x link rate\n", + intel_dp->lane_count, intel_dp->link_bw); + + /* Train the link */ + intel_dp->DP = intel_dig_port->saved_port_bits | + DDI_BUF_CTL_ENABLE | + DDI_BUF_EMP_400MV_0DB_HSW; + intel_dp->DP |= DDI_PORT_WIDTH(intel_dp->lane_count); + + if (!intel_dp_start_link_train(intel_dp)) { + DRM_DEBUG_KMS("Displayport: intel_dp_start_link_train() failed\n"); + test_result = false; + } + if (!intel_dp_complete_link_train(intel_dp)) { + DRM_DEBUG_KMS("Displayport: intel_dp_complete_link_train() failed\n"); + test_result = false; + } + if (!intel_dp_stop_link_train(intel_dp)) { + DRM_DEBUG_KMS("Displayport: intel_dp_stop_link_train() failed\n"); + test_result = false; + } + + /* Check link status for successful completion */ + if (drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) + test_result = true; + + if (test_result == false) { + /* Clear link training here */ + intel_dp_set_idle_link_train(intel_dp); + } + return test_result; }