From patchwork Thu Aug 24 20:50:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gil Dekel X-Patchwork-Id: 13364704 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id D0431C3DA6F for ; Thu, 24 Aug 2023 20:54:03 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 581A910E5BB; Thu, 24 Aug 2023 20:54:03 +0000 (UTC) Received: from mail-qv1-xf29.google.com (mail-qv1-xf29.google.com [IPv6:2607:f8b0:4864:20::f29]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5FD9A10E5BB for ; Thu, 24 Aug 2023 20:54:01 +0000 (UTC) Received: by mail-qv1-xf29.google.com with SMTP id 6a1803df08f44-64a5bc53646so1447436d6.2 for ; Thu, 24 Aug 2023 13:54:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1692910440; x=1693515240; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=zd8Hcb8bUMAg6xjVWrQA+j3K01zN9mJ6vxyg0IYjiVM=; b=gjzfNPX9LoAr77g9GwPZERPgQ0DhuAv+jknzGEzN9kjE/RFxP7s0NWPckAYYp2k5y0 PIxwOMgVuOv3CgpS8vlNxuX32Mj1qyXYVRa8uSNYkHDsboR30wRlfN36NHCmzrazWZnC J/CD0Z7PuSWXWGYxW1KtCiPvFl7aALAza+r6A= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1692910440; x=1693515240; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=zd8Hcb8bUMAg6xjVWrQA+j3K01zN9mJ6vxyg0IYjiVM=; b=XIyFGfpd98h32IMLtgIgD6gF6TLaU45bFeXAlAOkuLjfZEFB8o5l7lme/AJUTqI/R9 pkgD9NNEbjhsWUMNQZal/HWIb0fiqdYaJscURKJczfMZDbs0VTwpYAkMN4WQ3pVFsUG4 bbNx4ukLNeaU1VihWxiTFg5d9hzi3iu5KDF+SxwIv+3LpML/hhRb9mPiqf5dK88WjwSf Zj/MXek5vJovwydj/Ms/+VRKG9QkLQL/Byu96KyIhRuecPYkEy8T0YWWrJD3sCY+ah65 hKwjzBKBXqC2VVtlBIxSKE9Sye5A3pWMex4B1MW7tFnuIltG+++K8FAtqDbYOuFMPBv1 cLmQ== X-Gm-Message-State: AOJu0Yy90yryWveFmaeTJkqvdFiCntKGkzAk+fxaW3iF9D+3ACHVnpxr horegR7xr2tjAvoX7YVElOPzMvJT/uTiesKbW8s= X-Google-Smtp-Source: AGHT+IFPFsVjBorxvfHZ1QUE+vSfS9VuOUCwJHbsWj7p5D3LlrhXRrxCkP+R1To4qM7YJwh1Ffairw== X-Received: by 2002:a0c:e503:0:b0:64a:cce0:989b with SMTP id l3-20020a0ce503000000b0064acce0989bmr18306066qvm.58.1692910440106; Thu, 24 Aug 2023 13:54:00 -0700 (PDT) Received: from gildekel.nyc.corp.google.com ([2620:0:1003:314:321d:e6f5:6dbd:3e5]) by smtp.gmail.com with ESMTPSA id d2-20020a0ce442000000b0064f5020df91sm62038qvm.28.2023.08.24.13.53.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Aug 2023 13:53:59 -0700 (PDT) From: Gil Dekel To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Date: Thu, 24 Aug 2023 16:50:17 -0400 Message-ID: <20230824205335.500163-3-gildekel@chromium.org> X-Mailer: git-send-email 2.42.0.rc1.204.g551eb34607-goog In-Reply-To: <20230824205335.500163-1-gildekel@chromium.org> References: <20230824205335.500163-1-gildekel@chromium.org> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v4 2/6] drm/i915/dp_link_training: Add a final failing state to link training fallback for MST 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: , Cc: seanpaul@chromium.org, Gil Dekel Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Currently, MST link training has no fallback. This means that if an MST base connector fails to link-train once, the training completely fails, which makes this case significantly more common than a complete SST link training failure. Similar to the final failure state of SST, this patch zeros out both max_link_rate and max_link_lane_count. In addition, it stops resetting MST params so the zeroing of the HBR fields stick. This ensures that the MST base connector's modes will be completely pruned, since it is effectively left with 0Gbps bandwidth. Signed-off-by: Gil Dekel --- drivers/gpu/drm/i915/display/intel_dp.c | 27 ++++++++++--------- drivers/gpu/drm/i915/display/intel_dp.h | 2 +- .../drm/i915/display/intel_dp_link_training.c | 8 +++--- 3 files changed, 20 insertions(+), 17 deletions(-) -- Gil Dekel, Software Engineer, Google / ChromeOS Display and Graphics diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 2152ddbab557..01b180c8d9bd 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -630,7 +630,7 @@ static bool intel_dp_can_link_train_fallback_for_edp(struct intel_dp *intel_dp, return true; } -int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp, +void intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp, int link_rate, u8 lane_count) { struct drm_i915_private *i915 = dp_to_i915(intel_dp); @@ -638,18 +638,23 @@ int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp, /* * TODO: Enable fallback on MST links once MST link compute can handle - * the fallback params. + * the fallback params. For now, similar to the SST case, ensure all of + * the base connector's modes are pruned in the next connector probe by + * effectively reducing its bandwidth to 0 so userspace can ignore it + * within the next modeset attempt. */ if (intel_dp->is_mst) { drm_err(&i915->drm, "Link Training Unsuccessful\n"); - return -1; + intel_dp->max_link_rate = 0; + intel_dp->max_link_lane_count = 0; + return; } if (intel_dp_is_edp(intel_dp) && !intel_dp->use_max_params) { drm_dbg_kms(&i915->drm, "Retrying Link training for eDP with max parameters\n"); intel_dp->use_max_params = true; - return 0; + return; } index = intel_dp_rate_index(intel_dp->common_rates, @@ -662,7 +667,7 @@ int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp, lane_count)) { drm_dbg_kms(&i915->drm, "Retrying Link training for eDP with same parameters\n"); - return 0; + return; } intel_dp->max_link_rate = intel_dp_common_rate(intel_dp, index - 1); intel_dp->max_link_lane_count = lane_count; @@ -673,7 +678,7 @@ int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp, lane_count >> 1)) { drm_dbg_kms(&i915->drm, "Retrying Link training for eDP with same parameters\n"); - return 0; + return; } intel_dp->max_link_rate = intel_dp_max_common_rate(intel_dp); intel_dp->max_link_lane_count = lane_count >> 1; @@ -686,10 +691,7 @@ int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp, */ intel_dp->max_link_rate = 0; intel_dp->max_link_lane_count = 0; - return 0; } - - return 0; } u32 intel_dp_mode_to_fec_clock(u32 mode_clock) @@ -5310,10 +5312,11 @@ intel_dp_detect(struct drm_connector *connector, intel_dp_configure_mst(intel_dp); /* - * TODO: Reset link params when switching to MST mode, until MST - * supports link training fallback params. + * Note: Even though MST link training fallback is not yet implemented, + * do not reset. This is because the base connector needs to have all + * its modes pruned when link training for the MST port fails. */ - if (intel_dp->reset_link_params || intel_dp->is_mst) { + if (intel_dp->reset_link_params) { intel_dp_reset_max_link_params(intel_dp); intel_dp->reset_link_params = false; } diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h index 788a577ebe16..7388510e0cb2 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.h +++ b/drivers/gpu/drm/i915/display/intel_dp.h @@ -40,7 +40,7 @@ bool intel_dp_init_connector(struct intel_digital_port *dig_port, struct intel_connector *intel_connector); void intel_dp_set_link_params(struct intel_dp *intel_dp, int link_rate, int lane_count); -int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp, +void intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp, int link_rate, u8 lane_count); int intel_dp_get_active_pipes(struct intel_dp *intel_dp, struct drm_modeset_acquire_ctx *ctx, 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 4485ef4f8ec6..31d0d7854003 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c @@ -1075,10 +1075,10 @@ static void intel_dp_schedule_fallback_link_training(struct intel_dp *intel_dp, lt_dbg(intel_dp, DP_PHY_DPRX, "Link Training failed with HOBL active, not enabling it from now on\n"); intel_dp->hobl_failed = true; - } else if (intel_dp_get_link_train_fallback_values(intel_dp, - crtc_state->port_clock, - crtc_state->lane_count)) { - return; + } else { + intel_dp_get_link_train_fallback_values(intel_dp, + crtc_state->port_clock, + crtc_state->lane_count); } /* Schedule a Hotplug Uevent to userspace to start modeset */