From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DDF78C433F5 for ; Wed, 29 Sep 2021 16:54:57 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7ED4661425 for ; Wed, 29 Sep 2021 16:54:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 7ED4661425 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E8FCA6E1D5; Wed, 29 Sep 2021 16:54:56 +0000 (UTC) Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by gabe.freedesktop.org (Postfix) with ESMTPS id A33286E1D5 for ; Wed, 29 Sep 2021 16:54:55 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10122"; a="225059959" X-IronPort-AV: E=Sophos;i="5.85,332,1624345200"; d="scan'208";a="225059959" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Sep 2021 09:54:54 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.85,332,1624345200"; d="scan'208";a="457103402" Received: from stinkbox.fi.intel.com (HELO stinkbox) ([10.237.72.171]) by orsmga002.jf.intel.com with SMTP; 29 Sep 2021 09:54:52 -0700 Received: by stinkbox (sSMTP sendmail emulation); Wed, 29 Sep 2021 19:54:52 +0300 From: Ville Syrjala To: intel-gfx@lists.freedesktop.org Date: Wed, 29 Sep 2021 19:54:52 +0300 Message-Id: <20210929165452.11283-1-ville.syrjala@linux.intel.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210927182455.27119-9-ville.syrjala@linux.intel.com> References: <20210927182455.27119-9-ville.syrjala@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [Intel-gfx] [PATCH v3 8/9] drm/i915: Prepare link training for per-lane drive settings X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Ville Syrjälä Adjust the link training code to accommodate per-lane drive settings, if supported by the platform. Actually enabling this will involve some changes to each platform's .set_signal_level() implementation, so for the moment all supported platforms will keep using the current codepath that just uses the same drive settings for all the lanes. v2: Fix min() vs. max() fumble v3: Compact the debug print to a single line Signed-off-by: Ville Syrjälä --- .../drm/i915/display/intel_dp_link_training.c | 78 ++++++++++++++----- 1 file changed, 60 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c index d52929855cd0..f26c44a6b568 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c @@ -301,21 +301,33 @@ static u8 intel_dp_phy_preemph_max(struct intel_dp *intel_dp, return preemph_max; } -void -intel_dp_get_adjust_train(struct intel_dp *intel_dp, - const struct intel_crtc_state *crtc_state, - enum drm_dp_phy dp_phy, - const u8 link_status[DP_LINK_STATUS_SIZE]) +static bool has_per_lane_signal_levels(struct intel_dp *intel_dp, + enum drm_dp_phy dp_phy) +{ + return false; +} + +static u8 intel_dp_get_lane_adjust_train(struct intel_dp *intel_dp, + const struct intel_crtc_state *crtc_state, + enum drm_dp_phy dp_phy, + const u8 link_status[DP_LINK_STATUS_SIZE], + int lane) { u8 v = 0; u8 p = 0; - int lane; u8 voltage_max; u8 preemph_max; - for (lane = 0; lane < crtc_state->lane_count; lane++) { - v = max(v, drm_dp_get_adjust_request_voltage(link_status, lane)); - p = max(p, drm_dp_get_adjust_request_pre_emphasis(link_status, lane)); + if (has_per_lane_signal_levels(intel_dp, dp_phy)) { + lane = min(lane, crtc_state->lane_count - 1); + + v = drm_dp_get_adjust_request_voltage(link_status, lane); + p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane); + } else { + for (lane = 0; lane < crtc_state->lane_count; lane++) { + v = max(v, drm_dp_get_adjust_request_voltage(link_status, lane)); + p = max(p, drm_dp_get_adjust_request_pre_emphasis(link_status, lane)); + } } preemph_max = intel_dp_phy_preemph_max(intel_dp, dp_phy); @@ -328,8 +340,21 @@ intel_dp_get_adjust_train(struct intel_dp *intel_dp, if (v >= voltage_max) v = voltage_max | DP_TRAIN_MAX_SWING_REACHED; + return v | p; +} + +void +intel_dp_get_adjust_train(struct intel_dp *intel_dp, + const struct intel_crtc_state *crtc_state, + enum drm_dp_phy dp_phy, + const u8 link_status[DP_LINK_STATUS_SIZE]) +{ + int lane; + for (lane = 0; lane < 4; lane++) - intel_dp->train_set[lane] = v | p; + intel_dp->train_set[lane] = + intel_dp_get_lane_adjust_train(intel_dp, crtc_state, + dp_phy, link_status, lane); } static int intel_dp_training_pattern_set_reg(struct intel_dp *intel_dp, @@ -394,22 +419,39 @@ intel_dp_program_link_training_pattern(struct intel_dp *intel_dp, intel_dp->set_link_train(intel_dp, crtc_state, dp_train_pat); } +#define TRAIN_SET_FMT "%d%s/%d%s/%d%s/%d%s" +#define _TRAIN_SET_VSWING_ARGS(train_set) \ + ((train_set) & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT, \ + (train_set) & DP_TRAIN_MAX_SWING_REACHED ? "(max)" : "" +#define TRAIN_SET_VSWING_ARGS(train_set) \ + _TRAIN_SET_VSWING_ARGS((train_set)[0]), \ + _TRAIN_SET_VSWING_ARGS((train_set)[1]), \ + _TRAIN_SET_VSWING_ARGS((train_set)[2]), \ + _TRAIN_SET_VSWING_ARGS((train_set)[3]) +#define _TRAIN_SET_PREEMPH_ARGS(train_set) \ + ((train_set) & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT, \ + (train_set) & DP_TRAIN_MAX_PRE_EMPHASIS_REACHED ? "(max)" : "" +#define TRAIN_SET_PREEMPH_ARGS(train_set) \ + _TRAIN_SET_PREEMPH_ARGS((train_set)[0]), \ + _TRAIN_SET_PREEMPH_ARGS((train_set)[1]), \ + _TRAIN_SET_PREEMPH_ARGS((train_set)[2]), \ + _TRAIN_SET_PREEMPH_ARGS((train_set)[3]) + void intel_dp_set_signal_levels(struct intel_dp *intel_dp, const struct intel_crtc_state *crtc_state, enum drm_dp_phy dp_phy) { struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base; struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); - u8 train_set = intel_dp->train_set[0]; char phy_name[10]; - drm_dbg_kms(&dev_priv->drm, "Using vswing level %d%s, pre-emphasis level %d%s, at %s\n", - train_set & DP_TRAIN_VOLTAGE_SWING_MASK, - train_set & DP_TRAIN_MAX_SWING_REACHED ? " (max)" : "", - (train_set & DP_TRAIN_PRE_EMPHASIS_MASK) >> - DP_TRAIN_PRE_EMPHASIS_SHIFT, - train_set & DP_TRAIN_MAX_PRE_EMPHASIS_REACHED ? - " (max)" : "", + drm_dbg_kms(&dev_priv->drm, "[ENCODER:%d:%s] lanes: %d, " + "vswing levels: " TRAIN_SET_FMT ", " + "pre-emphasis levels: " TRAIN_SET_FMT ", at %s\n", + encoder->base.base.id, encoder->base.name, + crtc_state->lane_count, + TRAIN_SET_VSWING_ARGS(intel_dp->train_set), + TRAIN_SET_PREEMPH_ARGS(intel_dp->train_set), intel_dp_phy_name(dp_phy, phy_name, sizeof(phy_name))); if (intel_dp_phy_is_downstream_of_source(intel_dp, dp_phy)) -- 2.32.0