From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=198.175.65.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793894582; b=qLW53rWQBMlLWbFum5IG8I2yrj7KbnMU/RvuQCUSAlN/slvgkH7ePXlei3tvH0IyRgIh MR1Q5Q4Gdjv4Fqb8PrKR37+jtHz6jWvVaXnNFtl9NLPHyyH5Rq6jxtV++sRArpXY1K4Nn S2vcsJg8PuLzhXIWlv4xfA6NH/AgjjfyuMs2KbUGNHydK7RD41uxspn5Hsfajju1x54s9 LI6slTZAJaqo00Q2lpSJLxqGrjeDTlazQ9B2xBSVY8hZxrR97sNtOeDEnZFRKNzb/v1RV SRJW/Z+1A6TwUtot+Auq6gEMXfgTfiUZvbOIzvjftPpw54xW9Jm1hWzqCXs640+jqaw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793894582; h=DMARC-Filter:DKIM-Signature:X-CSE-ConnectionGUID:X-CSE-MsgGUID: X-IronPort-AV:X-IronPort-AV:Received:X-CSE-ConnectionGUID: X-CSE-MsgGUID:X-ExtLoop1:X-IronPort-AV:Received:From:To:Cc:Subject: Date:Message-ID:X-Mailer:MIME-Version:Content-Transfer-Encoding; bh=6AQzQankNQ4p5GSyZwTNeT9GWERJykoa+vt/ARzgYpU=; b=yZhWTL8EdqO1ViiZK12q+M4yJ2uXaR+YlMzb2UTGMfW0qrB0SmjObn9sUdD1dgrgfqW6 9l71FQv3G2kwXo8AnIX+y2+4hN3X4P5swRjwfYMYF8hjZi1xOZehEj3ffiAKO5jJS6+zi 3eij5EYP6BEUtkxy1QAkK5URNYZR5JGBnxhSIthMR/ZHQ7KtLD4Y75ON/35DcIVCJZqPN GS9Ieuns9TudZ444sZDxGRFyvZR+4FkeibOUvS/5Zwq3/Q8TmGTbMyMv2rTREJikpjXl/ na4Y/feiS4JZHt7ydBmj5YQcpm52UAcdAzoaig57/MI8pqebWS9Y4vmOJI8j83VzERQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=no4OBv0A; arc=none smtp.remote-ip=198.175.65.18 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.18]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5F5656070786; Thu, 5 Nov 2026 16:03:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 5F5656070786 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=no4OBv0A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1793894581; x=1825430581; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=3Z0O4+5RumCUzr/1oec2XjDDWA1Q7OPMsIXT7MmiACE=; b=no4OBv0A6VASH52nsMJI7zbIXl452GJDWDdTa5eRZplPlP5JllUghY7+ PDOBqhpJSDsxE+VoupueeBvUzSyUxpQo/1wBG5WaPcSre/QVW5Vn0ghjU dsBG5yES+ScGG6xSe1ddQb8iSIXT3NRH6J0rS2JzNiZDyOR89YIx5E282 4aRQHKUkcfx8zFb0gqIknFmGPS5Te6gGI3ZCj5Z3NWkstv9S7Xcm8o4iT kVe215LSxgytrcEa0VoEIqYlHe51rgh+3ZEaoIxf8KgtfUKEIrUQmIsFk GhpRz673e9uZSKa0DWGmpT6LNTqAbFjC+21mJpTJAnKt4leQaB7VysoAr w==; X-CSE-ConnectionGUID: 5f4yHJD3QTmYKWHZyasexQ== X-CSE-MsgGUID: 2fD4sHJ8TBaChYCFN7YPjw== X-IronPort-AV: E=McAfee;i="6800,10657,11957"; a="2706044" X-IronPort-AV: E=Sophos;i="6.27,197,1787036400"; d="scan'208";a="2706044" Received: from fmviesa012.fm.intel.com ([10.60.135.152]) by orvoesa110.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Nov 2026 08:03:01 -0800 X-CSE-ConnectionGUID: TdoOQ5CpQm6EKMIBns42tQ== X-CSE-MsgGUID: 56Suo9wMTtyvaYRpTIniFA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,197,1787036400"; d="scan'208";a="8795674" Received: from ettammin-mobl3.ger.corp.intel.com (HELO kvehmane-desk1.ger.corp.intel.com) ([10.245.244.200]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Nov 2026 08:02:54 -0800 From: Kai Vehmanen To: intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org Cc: Jani Nikula , =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= , Rodrigo Vivi , Joonas Lahtinen , Tvrtko Ursulin , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Takashi Iwai , Jaroslav Kysela , linux-sound@vger.kernel.org, Harry Wentland , Leo Li , Alex Deucher , amd-gfx@lists.freedesktop.org, Lyude Paul , Danilo Krummrich , =?UTF-8?q?Tom=C3=A1=C5=A1=20Hnyk?= , Wim Taymans , nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org, Kai Vehmanen Subject: [PATCH 0/2] drm: Populate ELD Port_ID to identify audio endpoints Date: Thu, 5 Nov 2026 18:02:38 +0200 Message-ID: <20261105160240.2850042-1-kai.vehmanen@linux.intel.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The ELD Port_ID field (bytes 8..15 of the baseline block) is typically zero on Linux today: drm_edid_to_eld() leaves it empty and no in-tree driver fills it in. amdgpu, radeon and nouveau pass the raw connector->eld to the audio component. On the amdgpu DC Azalia register path the value is a hardcoded constant, the same for every port. Only closed display drivers fill the value. Pipewire added support for "Port_ID" in merge request: https://gitlab.freedesktop.org/pipewire/pipewire/-/merge_requests/3025 As a result, when two identical monitors are connected their ELDs are byte-identical, and userspace (e.g. PipeWire/WirePlumber) cannot passively tell which HDMI/DP PCM belongs to which DRM connector. This series adds a DRM helper that fills Port_ID with a common layout, and uses it in i915: bits 63:48 - PCI domain of the DRM device bits 47:32 - PCI bus/device/function of the DRM device bits 31:0 - DRM connector object ID The upper half follows the layout documented for the AMD Azalia sink info registers (dce_audio.c: "PORT_ID1 = 16bit BDF"). The aim is for this to become a convention other drivers can opt into. For drivers that copy connector->eld to the audio component (amdgpu DM, radeon, nouveau), adopting it would be a one-line change. Comments from the AMD and nouveau folks on whether the layout works for them are very welcome. An alternative would be to fill Port_ID directly in drm_edid_to_eld(), so every driver gets it without changes. I went with an opt-in helper to avoid changing the ELD contents seen by all drivers and existing userspace at once. The value is exposed to userspace via the ALSA ELD control and /proc/asound/cardX/eld#Y. Kai Vehmanen (2): drm/eld: Add drm_eld_set_port_id() helper drm/i915/audio: Populate ELD Port_ID drivers/gpu/drm/drm_eld.c | 42 ++++++++++++++++++++++ drivers/gpu/drm/i915/display/intel_audio.c | 2 ++ include/drm/drm_eld.h | 3 ++ 3 files changed, 47 insertions(+) -- 2.43.0