{"id":2220756,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2220756/?format=json","web_url":"http://patchwork.ozlabs.org/project/ubuntu-kernel/patch/20260408002056.230340-2-acelan.kao@canonical.com/","project":{"id":15,"url":"http://patchwork.ozlabs.org/api/1.1/projects/15/?format=json","name":"Ubuntu Kernel","link_name":"ubuntu-kernel","list_id":"kernel-team.lists.ubuntu.com","list_email":"kernel-team@lists.ubuntu.com","web_url":null,"scm_url":null,"webscm_url":null},"msgid":"<20260408002056.230340-2-acelan.kao@canonical.com>","date":"2026-04-08T00:20:56","name":"[SRU,R,1/1] UBUNTU: SAUCE: drm/i915/xelpdp/tc: Convert TCSS power check WARN to a debug message","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"4a4020d74878681ba4f3113a9f345c1859081bf1","submitter":{"id":2976,"url":"http://patchwork.ozlabs.org/api/1.1/people/2976/?format=json","name":"AceLan Kao","email":"acelan.kao@canonical.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/ubuntu-kernel/patch/20260408002056.230340-2-acelan.kao@canonical.com/mbox/","series":[{"id":499050,"url":"http://patchwork.ozlabs.org/api/1.1/series/499050/?format=json","web_url":"http://patchwork.ozlabs.org/project/ubuntu-kernel/list/?series=499050","date":"2026-04-08T00:20:56","name":"i915 WARN_ON call trace during CB/WB on MTL/ARL platforms","version":1,"mbox":"http://patchwork.ozlabs.org/series/499050/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2220756/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2220756/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=EFBvC6H4;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; helo=lists.ubuntu.com;\n envelope-from=kernel-team-bounces@lists.ubuntu.com;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists.ubuntu.com (lists.ubuntu.com [185.125.189.65])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fr3dX4dMGz1xtJ\n\tfor ; Wed, 08 Apr 2026 10:21:19 +1000 (AEST)","from localhost ([127.0.0.1] helo=lists.ubuntu.com)\n\tby lists.ubuntu.com with esmtp (Exim 4.86_2)\n\t(envelope-from )\n\tid 1wAGfP-0002Ud-Ib; Wed, 08 Apr 2026 00:21:11 +0000","from mail-qk1-f172.google.com ([209.85.222.172])\n by lists.ubuntu.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128)\n (Exim 4.86_2) (envelope-from ) id 1wAGfM-0002Sk-0a\n for kernel-team@lists.ubuntu.com; Wed, 08 Apr 2026 00:21:08 +0000","by mail-qk1-f172.google.com with SMTP id\n af79cd13be357-8cd71fb9f06so362088185a.2\n for ; Tue, 07 Apr 2026 17:21:07 -0700 (PDT)","from localhost (211-75-139-220.hinet-ip.hinet.net. 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This is a known BIOS handoff condition observed\nduring cold/warm boot on headless Meteorlake platforms.\n\nWhen this happens, tc_phy_get_current_mode() returns TC_PORT_DP_ALT\n(from HPD live status bits) but xelpdp_tc_phy_tcss_power_is_enabled()\nreturns false because TCSS power was never enabled by BIOS/GOP. This\ncauses the drm_WARN_ON in xelpdp_tc_phy_get_hw_state() to fire during\ndriver probe, even though the driver handles this state correctly\nafterwards by calling intel_tc_port_update_mode() to reconcile the\nPHY state.\n\nConvert the drm_WARN_ON to a drm_dbg_kms() message, consistent with\nthe approach taken for the analogous AUX power check in\ncommit d7fa5754e83cd (\"drm/i915/icl+/tc: Convert AUX powered WARN to a\ndebug message\").\n\nSigned-off-by: Chia-Lin Kao (AceLan) \n(cherry picked from commit https://lore.kernel.org/lkml/20260316093001.689992-1-acelan.kao@canonical.com/T/#u)\nSigned-off-by: Chia-Lin Kao (AceLan) \n---\n drivers/gpu/drm/i915/display/intel_tc.c | 7 ++++---\n 1 file changed, 4 insertions(+), 3 deletions(-)","diff":"diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c\nindex bd12148e42f70..18218e450b16c 100644\n--- a/drivers/gpu/drm/i915/display/intel_tc.c\n+++ b/drivers/gpu/drm/i915/display/intel_tc.c\n@@ -1187,9 +1187,10 @@ static void xelpdp_tc_phy_get_hw_state(struct intel_tc_port *tc)\n \t\t\ttc->max_lane_count = 4;\n \t}\n \n-\tdrm_WARN_ON(display->drm,\n-\t\t (tc->mode == TC_PORT_DP_ALT || tc->mode == TC_PORT_LEGACY) &&\n-\t\t !xelpdp_tc_phy_tcss_power_is_enabled(tc));\n+\tif ((tc->mode == TC_PORT_DP_ALT || tc->mode == TC_PORT_LEGACY) &&\n+\t !xelpdp_tc_phy_tcss_power_is_enabled(tc))\n+\t\tdrm_dbg_kms(display->drm, \"Port %s: TCSS unexpectedly not powered\\n\",\n+\t\t\t tc->port_name);\n \n \t__tc_cold_unblock(tc, domain, tc_cold_wref);\n }\n","prefixes":["SRU","R","1/1"]}