From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.13]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 41E083EC2FD for ; Tue, 30 Jun 2026 10:17:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.13 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782814624; cv=none; b=nkZIIKh4qKhJq8ODDw+Mm7WUkrvBOxqv/GzoEa0ROVZwTvk6mWDTMy1LPILNhN6eBDZKmJzJTPjsL5stBSsHcu5SuiI8aSSt2pBhGh36DpY+hTRNe9YAEkTN085TfzWgt//En3F2PaP+/UQa9XMTCOmsgWCj4mYXQIjqegc4+OI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782814624; c=relaxed/simple; bh=mIwuhWkMrH9uKMppkRzzKMnN8kxnBLom7CvAGowHokQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=gB+2Vvn0SMZXGJClscseF70TgbjOHObyzz1ZBlyFhUdHLR2/eStNSr83j5vNVeZO4n3ZxUlCVUFzyzGRj7Cr6MhknauV2FIWps6UkSwHXW9AKHrnk8PQcWQxQny8XVoj+wNXMSO2k2FVfrWkbjM/Ai724aGlPVcp6Tk5yk3/oOs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=MgpfWjqX; arc=none smtp.client-ip=192.198.163.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="MgpfWjqX" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1782814621; x=1814350621; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=mIwuhWkMrH9uKMppkRzzKMnN8kxnBLom7CvAGowHokQ=; b=MgpfWjqX1mjjjXYoVfbpgzJx7C89aA+XCyfQhUyt//qFVdY4dcgKSgdD CZN9wKDwGf/OZeBIzTxA64xho11SuPNRjtPJM1/4divo3+k1HWy5A1jar 2PLV3YM2royzjmDIfQRkTf0cRIYuurLoCHB/Wx1P14n604lLXYuG/Aees PGHwSBOK6P1haSytoVfhQcCmOQM3bs8cDIGWwVJtBPfFcLEctLX0Q0VE+ KAqfKVWT15iY4y6Dgd5FqXoElcsSjU4GdNCfqfbmx9lCLqWBJ66vKFgFB PwzE96LOm+/RohR6Mco0DDi7VxwV9uCXmpNf5uKxpGcGn8hoTTsB9ZzMw g==; X-CSE-ConnectionGUID: aoIVbPqtSTalHvpBZTTYtg== X-CSE-MsgGUID: DXEG6W3pTy+D1S8Oawp7Rw== X-IronPort-AV: E=McAfee;i="6800,10657,11832"; a="86074034" X-IronPort-AV: E=Sophos;i="6.24,233,1774335600"; d="scan'208";a="86074034" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by fmvoesa107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Jun 2026 03:17:00 -0700 X-CSE-ConnectionGUID: 97wgWLmnTkG+U6c7Mv8eOg== X-CSE-MsgGUID: osI9SIihSWyz5lPC7wgqyw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.24,233,1774335600"; d="scan'208";a="249584311" Received: from woei-desk.jf.intel.com ([10.165.243.17]) by fmviesa008.fm.intel.com with ESMTP; 30 Jun 2026 03:17:00 -0700 From: mei.fan.liou@intel.com To: Jani Nikula , Rodrigo Vivi Cc: Joonas Lahtinen , Tvrtko Ursulin , David Airlie , Simona Vetter , intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, "LIOU, Mei Fan" , LIOU Subject: [PATCH] drm/i915: add disable_edp module parameter to skip phantom eDP init Date: Tue, 30 Jun 2026 03:28:45 -0700 Message-ID: <20260630102845.2678707-1-mei.fan.liou@intel.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: "LIOU, Mei Fan" Some platforms have BIOS/VBT that declares an eDP panel present while no physical panel is connected. This causes intel_edp_init_connector() to spend ~6 seconds waiting on PPS power sequencer and AUX channel timeouts before failing gracefully. Introduce a new boolean module parameter 'disable_edp' (default: false) that allows users to skip eDP connector initialization entirely. When set, the driver logs an informational message and returns false early from intel_edp_init_connector(), bypassing all PPS/AUX probing. This is modeled after the existing 'disable_display' parameter and is intended as a workaround for headless or display-less deployments where the BIOS incorrectly advertises an internal panel. Signed-off-by: LIOU, Mei Fan --- drivers/gpu/drm/i915/display/intel_display_params.c | 3 +++ drivers/gpu/drm/i915/display/intel_display_params.h | 1 + drivers/gpu/drm/i915/display/intel_dp.c | 7 +++++++ 3 files changed, 11 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_display_params.c b/drivers/gpu/drm/i915/display/intel_display_params.c index 2aed110c5b09..8d47d19b1667 100644 --- a/drivers/gpu/drm/i915/display/intel_display_params.c +++ b/drivers/gpu/drm/i915/display/intel_display_params.c @@ -102,6 +102,9 @@ intel_display_param_named_unsafe(force_reset_modeset_test, bool, 0400, intel_display_param_named(disable_display, bool, 0400, "Disable display (default: false)"); +intel_display_param_named(disable_edp, bool, 0400, + "Disable eDP panel init, skips PPS/AUX probing when VBT declares eDP but no panel is present (default: false)"); + intel_display_param_named(verbose_state_checks, bool, 0400, "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions."); diff --git a/drivers/gpu/drm/i915/display/intel_display_params.h b/drivers/gpu/drm/i915/display/intel_display_params.h index b95ecf728daa..98ab0d753dab 100644 --- a/drivers/gpu/drm/i915/display/intel_display_params.h +++ b/drivers/gpu/drm/i915/display/intel_display_params.h @@ -41,6 +41,7 @@ struct drm_printer; param(bool, load_detect_test, false, 0600) \ param(bool, force_reset_modeset_test, false, 0600) \ param(bool, disable_display, false, 0400) \ + param(bool, disable_edp, false, 0400) \ param(bool, verbose_state_checks, true, 0400) \ param(bool, nuclear_pageflip, false, 0400) \ param(bool, enable_dp_mst, true, 0600) \ diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 85d3aa3b9894..c6293a1b3840 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -7214,6 +7214,13 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp, if (!intel_dp_is_edp(intel_dp)) return true; + if (display->params.disable_edp) { + drm_info(display->drm, + "[ENCODER:%d:%s] eDP disabled by module parameter, skipping init\n", + encoder->base.base.id, encoder->base.name); + return false; + } + /* * On IBX/CPT we may get here with LVDS already registered. Since the * driver uses the only internal power sequencer available for both -- 2.43.0