[{"id":3674621,"web_url":"http://patchwork.ozlabs.org/comment/3674621/","msgid":"<332f531e-40bb-46f2-be3a-cfc482a8afb8@canonical.com>","list_archive_url":null,"date":"2026-04-08T07:35:37","subject":"ACK: [SRU][R][PATCH 0/1] drm/i915/lnl+/tc: Fix false disconnect of\n active DP-alt TC port during long HPD pulse","submitter":{"id":92836,"url":"http://patchwork.ozlabs.org/api/people/92836/","name":"Yufeng Gao","email":"yufeng.gao@canonical.com"},"content":"On 8/4/26 10:24, AceLan Kao wrote:\n> From: \"Chia-Lin Kao (AceLan)\" \n>\n> BugLink: https://bugs.launchpad.net/bugs/2143879\n>\n> [Impact]\n> On HP systems (CID: 202512-38233) with Intel Lunar Lake GPU and HP Type-C to HDMI dongle\n> (03f0:8a4a), switching to mirror mode via hotkey fails. The system cannot switch mirror\n> mode on X11 when using a Type-C to HDMI external monitor.\n> The root cause is that on XELPDP+ platforms (Lunar Lake and later), the LTTPR dongle\n> fires a long HPD pulse after link training. The tc_phy_hpd_live_status() function reads\n> PICAINTERRUPT_ISR to determine DP-alt live status, but the XELPDP_DP_ALT_HOTPLUG_MASK\n> bit deasserts during a long HPD pulse. Since intel_tc_port_handles_hpd_glitches() returns\n> true for TC dp-alt ports, the 4ms glitch-filter retry loop is bypassed, giving no\n> protection against this transient deassertion. The hotplug handler then marks DP-1 as\n> disconnected, and the compositor disables eDP-1.\n> Error log:\n> xe 0000:00:02.0: [drm:intel_dp_hpd_pulse [xe]] got hpd irq on [ENCODER:270:DDI TC1/PHY TC1] - long\n> xe 0000:00:02.0: [drm:drm_dp_dpcd_access [drm_display_helper]] AUX USBC1/DDI TC1/PHY TC1: Too many retries, giving up. First error: -6\n> xe 0000:00:02.0: [drm:intel_hotplug_detect_connector [xe]] [CONNECTOR:271:DP-1] status updated from connected to disconnected (epoch counter 178->179)\n> [drm:intel_dp_hpd_pulse] got hpd irq on [ENCODER:270:DDI TC1/PHY TC1] - long\n> [drm:intel_tc_port_update_mode] Port D/TC#1: TC port mode reset (disconnected -> tbt-alt)\n> [drm:intel_dp_hpd_pulse] got hpd irq on [ENCODER:270:DDI TC1/PHY TC1] - long\n> [drm:intel_hotplug_detect_connector] [CONNECTOR:271:DP-1] status updated from connected to disconnected\n> Affected hardware: HP systems (CID: 202512-38233) with Intel Lunar Lake GPU\n> Failure rate: High (reproducible with HP Type-C to HDMI dongle 03f0:8a4a on X11)\n>\n> [Fix]\n> When the port has an active link (link_refcount > 0), trust the PHY ownership register\n> (XELPDP_PORT_BUF_CTL1 & XELPDP_TC_PHY_OWNERSHIP) over the transient HPD live status\n> in intel_tc_port_connected(). The ownership register is stable and does not toggle\n> during HPD pulses. The TC cold power domain is guaranteed to be held when\n> link_refcount > 0, as __intel_tc_port_lock() already asserts and verifies this via\n> tc_phy_is_owned() before reaching intel_tc_port_connected().\n> The patch is currently under review on the Intel DRM mailing list (not yet merged to\n> mainline).\n> Patch:\n> https://lore.kernel.org/lkml/20260305075857.40077-1-acelan.kao@canonical.com/T/#u\n>\n> [Test Plan]\n> 1. Connect HP Type-C to HDMI dongle (03f0:8a4a) to the system.\n> 2. Ensure the external monitor is displaying output (extended mode).\n> 3. Press the hotkey to switch to mirror mode.\n> Without the patch: The external monitor fails to switch to mirror mode. The kernel log\n> shows DP-1 connector status updated from connected to disconnected, and the internal\n> display may also blank.\n> With the patch: Mirror mode switches successfully. The kernel log shows the TC port\n> correctly stays in or returns to dp-alt mode:\n> [drm:intel_tc_port_update_mode] Port D/TC#1: TC port mode reset (dp-alt -> disconnected)\n> [drm:intel_tc_port_update_mode] Port D/TC#1: TC port mode reset (disconnected -> dp-alt)\n>\n> [Where problems could occur]\n> It may affect the i915/xe display driver's Type-C port management on Lunar Lake and\n> later platforms.\n> If the condition `tc_phy_is_owned()` returns a stale or incorrect ownership state while\n> link_refcount > 0, the driver could incorrectly report a port as connected when the\n> physical link has actually been removed. This would manifest as a phantom connected\n> display that cannot be detected as disconnected until the next full port reset, potentially\n> causing display configuration errors or a hung compositor.\n> Additionally, the early-return path bypasses the existing tc_phy_hpd_live_status() mask\n> check. If there is an edge case where link_refcount > 0 but the port mode transitions\n> away from TC_PORT_DP_ALT between the refcount check and the ownership check, the port\n> status could be misreported.\n> The patch is submitted upstream for review but not yet merged.\n>\n> [Other Info]\n> The patch is submitted to the Intel DRM mailing list for review but not yet merged to\n> mainline.\n> This issue only reproduces with the HP Type-C to HDMI dongle (03f0:8a4a) on X11. Wayland\n> and other dongle types (Type-C to DP/VGA, built-in HDMI/Thunderbolt) are not affected.\n>\n> Chia-Lin Kao (AceLan) (1):\n> UBUNTU: SAUCE: drm/i915/lnl+/tc: Fix false disconnect of active DP-alt\n> TC port during long HPD pulse\n>\n> drivers/gpu/drm/i915/display/intel_tc.c | 5 +++++\n> 1 file changed, 5 insertions(+)\n>\nAcked-by: Yufeng Gao ","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\" (4096-bit key;\n unprotected) header.d=canonical.com header.i=@canonical.com\n header.a=rsa-sha256 header.s=20251003 header.b=loovwEK+;\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 4frFGx0kj3z1xv0\n\tfor ; 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charset=\"utf-8\"; Format=\"flowed\"","Errors-To":"kernel-team-bounces@lists.ubuntu.com","Sender":"\"kernel-team\" "}},{"id":3674664,"web_url":"http://patchwork.ozlabs.org/comment/3674664/","msgid":"","list_archive_url":null,"date":"2026-04-08T09:00:08","subject":"APPLIED[R]: Re: [SRU][R][PATCH 0/1] drm/i915/lnl+/tc: Fix false\n disconnect of active DP-alt TC port during long HPD pulse","submitter":{"id":7245,"url":"http://patchwork.ozlabs.org/api/people/7245/","name":"Paolo Pisati","email":"paolo.pisati@canonical.com"},"content":"On Wed, Apr 08, 2026 at 08:24:16AM +0800, AceLan Kao wrote:\n> From: \"Chia-Lin Kao (AceLan)\" \n> \n> BugLink: https://bugs.launchpad.net/bugs/2143879\n\nApplied.","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\" (4096-bit key;\n unprotected) header.d=canonical.com header.i=@canonical.com\n header.a=rsa-sha256 header.s=20251003 header.b=mWZ3poAc;\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; 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