From mboxrd@z Thu Jan 1 00:00:00 1970 From: Todd Previte Subject: [PATCH 5/6] drm/i915: Update Displayport compliance testing for link training Date: Tue, 24 Jun 2014 15:12:53 -0700 Message-ID: <1403647974-42377-6-git-send-email-tprevite@gmail.com> References: <1403647974-42377-1-git-send-email-tprevite@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-pa0-f49.google.com (mail-pa0-f49.google.com [209.85.220.49]) by gabe.freedesktop.org (Postfix) with ESMTP id 5E9016E5BA for ; Tue, 24 Jun 2014 15:13:38 -0700 (PDT) Received: by mail-pa0-f49.google.com with SMTP id lj1so811790pab.36 for ; Tue, 24 Jun 2014 15:13:38 -0700 (PDT) In-Reply-To: <1403647974-42377-1-git-send-email-tprevite@gmail.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org Adds basic link training test functionality for Displayport compliance. Signed-off-by: Todd Previte --- drivers/gpu/drm/i915/intel_dp.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 4c5d229..95bd27a 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -3405,6 +3405,30 @@ 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; + + /* 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_start_link_train(intel_dp); + intel_dp_complete_link_train(intel_dp); + intel_dp_stop_link_train(intel_dp); + + // Check link status for successful completion + if (drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) + test_result = true; + return test_result; } -- 1.9.1