From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 62DCECAC584 for ; Sun, 7 Sep 2025 07:46:33 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4989E10E192; Sun, 7 Sep 2025 07:46:30 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="lmHmrf6H"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.9]) by gabe.freedesktop.org (Postfix) with ESMTPS id C8D4D10E183; Sun, 7 Sep 2025 07:46:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1757231189; x=1788767189; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=fx/KfvxUk8UnL4dsZPl49/XniM9bJgBjwXNAhipKIMM=; b=lmHmrf6HkJBe/12w0kdV3/tr/D29TVK63CdXW121p6KmXRpJ54ZUf+7I uGWvKufb1dcggg/jp9lNCPWRXrHoBWDTe++Gsh6UWhhwhEUOQePlwjZ0F Jd6FP8txzw7JpwKgIVbUKyDAIPLm+5aC+kZJeVLFObhXs0hv385tzKTW2 JEzSk3H8NrMaZe7pe3USF9FcPwULJkm1JhQQWaXnSTkxkWbb/Gp3BUciW G/D6gunOuJCGaJ907+6XQt1NHAw/UTFyhickxvyBA/Bmhs1LqL1uBHo4j BveDCbyZjA0b2YJKh/wi7zh81riLDHLHLbCOafQKLDWLDE3Fl/+EhgWw5 A==; X-CSE-ConnectionGUID: jOjPcnhiSXacOzieJR91CQ== X-CSE-MsgGUID: E5lxslUaQC+P0ArSmBRysg== X-IronPort-AV: E=McAfee;i="6800,10657,11545"; a="70220294" X-IronPort-AV: E=Sophos;i="6.18,246,1751266800"; d="scan'208";a="70220294" Received: from fmviesa005.fm.intel.com ([10.60.135.145]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Sep 2025 00:46:28 -0700 X-CSE-ConnectionGUID: NlWOCSDpS22US+VCA8mwiQ== X-CSE-MsgGUID: xGpwZZNKQFmRrpNIbOedFw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.18,246,1751266800"; d="scan'208";a="176873999" Received: from srr4-3-linux-103-aknautiy.iind.intel.com ([10.223.34.160]) by fmviesa005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Sep 2025 00:46:26 -0700 From: Ankit Nautiyal To: intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org Cc: ville.syrjala@linux.intel.com, Ankit Nautiyal , Mitul Golani Subject: [PATCH 07/14] drm/i915/alpm: Add function to compute max link-wake latency Date: Sun, 7 Sep 2025 13:02:34 +0530 Message-ID: <20250907073241.19632-8-ankit.k.nautiyal@intel.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20250907073241.19632-1-ankit.k.nautiyal@intel.com> References: <20250907073241.19632-1-ankit.k.nautiyal@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: intel-xe@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Xe graphics driver List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-xe-bounces@lists.freedesktop.org Sender: "Intel-xe" Introduce a helper to compute the max link wake latency when using Auxless/Aux wake mechanism for PSR/Panel Replay/LOBF features. This will be used to compute the minimum guardband so that the link wake latencies are accounted and these features work smoothly for higher refresh rate panels. Bspec: 70151, 71477 Signed-off-by: Ankit Nautiyal Reviewed-by: Mitul Golani --- drivers/gpu/drm/i915/display/intel_alpm.c | 15 +++++++++++++++ drivers/gpu/drm/i915/display/intel_alpm.h | 2 ++ 2 files changed, 17 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_alpm.c b/drivers/gpu/drm/i915/display/intel_alpm.c index ed7a7ed486b5..02de069b02d7 100644 --- a/drivers/gpu/drm/i915/display/intel_alpm.c +++ b/drivers/gpu/drm/i915/display/intel_alpm.c @@ -611,3 +611,18 @@ bool intel_alpm_get_error(struct intel_dp *intel_dp) return false; } + +int intel_alpm_compute_max_link_wake_latency(struct intel_crtc_state *crtc_state, + bool assume_all_enabled) +{ + int psr2_vblank_time = 0; + int auxless_wake_time = 0; + + if (assume_all_enabled || crtc_state->has_sel_update) + psr2_vblank_time = io_buffer_wake_time(crtc_state); + + if (assume_all_enabled || crtc_state->has_panel_replay) + auxless_wake_time = _lnl_compute_aux_less_wake_time(crtc_state); + + return max(psr2_vblank_time, auxless_wake_time); +} diff --git a/drivers/gpu/drm/i915/display/intel_alpm.h b/drivers/gpu/drm/i915/display/intel_alpm.h index a861c20b5d79..8f1db54eecf5 100644 --- a/drivers/gpu/drm/i915/display/intel_alpm.h +++ b/drivers/gpu/drm/i915/display/intel_alpm.h @@ -38,4 +38,6 @@ bool intel_alpm_is_alpm_aux_less(struct intel_dp *intel_dp, const struct intel_crtc_state *crtc_state); void intel_alpm_disable(struct intel_dp *intel_dp); bool intel_alpm_get_error(struct intel_dp *intel_dp); +int intel_alpm_compute_max_link_wake_latency(struct intel_crtc_state *crtc_state, + bool assume_all_enabled); #endif -- 2.45.2