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Fri, 6 Nov 2026 07:16:11 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id eUSTJ7t+7WpeLQAAD6G6ig (envelope-from ); Fri, 06 Nov 2026 07:16:11 +0000 Date: Fri, 06 Nov 2026 08:16:11 +0100 Message-ID: <87ld76qvk4.wl-tiwai@suse.de> From: Takashi Iwai To: Kai Vehmanen Cc: intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Jani Nikula , Ville =?ISO-8859-1?Q?Syrj=E4l=E4?= , 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 , =?ISO-8859-2?Q?Tom=E1=B9?= Hnyk , Wim Taymans , nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/2] drm: Populate ELD Port_ID to identify audio endpoints In-Reply-To: <20261105160240.2850042-1-kai.vehmanen@linux.intel.com> References: <20261105160240.2850042-1-kai.vehmanen@linux.intel.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/30.2 Mule/6.0 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 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-Spamd-Result: default: False [-12.30 / 50.00]; SUSE_INTERNAL_BYPASS(-9.00)[]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCPT_COUNT_TWELVE(0.00)[27]; RCVD_TLS_ALL(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_HAS_DN(0.00)[]; FREEMAIL_CC(0.00)[lists.freedesktop.org,linux.intel.com,intel.com,ursulin.net,kernel.org,suse.de,gmail.com,ffwll.ch,suse.com,perex.cz,vger.kernel.org,amd.com,redhat.com]; R_RATELIMIT(0.00)[to_ip_from(RL9y5169nakf5i7mj5a3kbj5yk)]; FROM_EQ_ENVFROM(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email,imap1.dmz-prg2.suse.org:helo] X-Spam-Score: -12.30 X-Spam-Level: X-Spam-Flag: NO On Thu, 05 Nov 2026 17:02:38 +0100, Kai Vehmanen wrote: > > 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 Reviewed-by: Takashi Iwai thanks, Takashi