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 58D94CCF9EE for ; Mon, 27 Oct 2025 16:29:46 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C550E10E4F7; Mon, 27 Oct 2025 16:29:45 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="ULXqUaaB"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) by gabe.freedesktop.org (Postfix) with ESMTPS id 269C710E4F7; Mon, 27 Oct 2025 16:29:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1761582585; x=1793118585; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=xUnD0RqrLrRXgsYnV9KuNdBQ45RR9mddrwFS61Pp04Q=; b=ULXqUaaBHR/wOguXXEVebb4ObH3Z1jRWqbR5H5no6eUZLicZfgdBcuId /L7OlkNG9hUEv4Zn5K7sZunoQBGUcWd3tB0yRcTjyFjiU9b7b+3fxQ/y3 +oZWVCgsAfCcLejGS6Ov5WWpeWyDC0KldKY7rOBuEBUeTjRwrG6QCG9UI kt/3/P/N/yOuiMrFAKmx2UL7fSwe6ysiO4rlkCTI5QujLTIZ7BWrmwEL9 oQ+EFFP4Yx2XAzmGouYFMS/w2GKNCcAYZKKgk7dPrf68U1pcOmryZvgbG ftXbDYOjWkqhTQZAPuVz5AbiZxnExlWC5WXFilMY3Pciu9gK9xU1KH08g Q==; X-CSE-ConnectionGUID: zT6yG4y7TM+5ZgiojSuzKA== X-CSE-MsgGUID: Z5KVr0uXQ46WcTurZr8ogw== X-IronPort-AV: E=McAfee;i="6800,10657,11586"; a="81299336" X-IronPort-AV: E=Sophos;i="6.19,259,1754982000"; d="scan'208";a="81299336" Received: from fmviesa007.fm.intel.com ([10.60.135.147]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Oct 2025 09:29:45 -0700 X-CSE-ConnectionGUID: s+w3PMppQxyA0Bgyo7WnDA== X-CSE-MsgGUID: RENHCzSCQmWbu4H8rX43ww== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,259,1754982000"; d="scan'208";a="184785581" Received: from mgolanimitul-x299-ud4-pro.iind.intel.com ([10.190.239.114]) by fmviesa007.fm.intel.com with ESMTP; 27 Oct 2025 09:29:43 -0700 From: Mitul Golani To: intel-gfx@lists.freedesktop.org Cc: intel-xe@lists.freedesktop.org, mitulkumar.ajitkumar.golani@intel.com, ankit.k.nautiyal@intel.com, uma.shankar@intel.com, ville.syrjala@linux.intel.com Subject: [PATCH v8 07/22] drm/i915/vrr: Add compute config for DC Balance params Date: Mon, 27 Oct 2025 21:59:12 +0530 Message-ID: <20251027162927.2655581-8-mitulkumar.ajitkumar.golani@intel.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20251027162927.2655581-1-mitulkumar.ajitkumar.golani@intel.com> References: <20251027162927.2655581-1-mitulkumar.ajitkumar.golani@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Compute DC Balance parameters and tunable params based on experiments. --v2: - Document tunable params. (Ankit) --v3: - Add line spaces to compute config. (Ankit) - Remove redundancy checks. Signed-off-by: Mitul Golani Reviewed-by: Ankit Nautiyal --- drivers/gpu/drm/i915/display/intel_vrr.c | 26 ++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c index 3c30c8d3e206..2948abc90c69 100644 --- a/drivers/gpu/drm/i915/display/intel_vrr.c +++ b/drivers/gpu/drm/i915/display/intel_vrr.c @@ -20,6 +20,14 @@ #define FIXED_POINT_PRECISION 100 #define CMRR_PRECISION_TOLERANCE 10 +/* + * Tunable parameters for DC Balance correction. + * These are captured based on experimentations. + */ +#define DCB_CORRECTION_SENSITIVITY 30 +#define DCB_CORRECTION_AGGRESSIVENESS 1000 +#define DCB_BLANK_TARGET 50 + bool intel_vrr_is_capable(struct intel_connector *connector) { struct intel_display *display = to_intel_display(connector); @@ -399,6 +407,24 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state, (crtc_state->hw.adjusted_mode.crtc_vtotal - crtc_state->hw.adjusted_mode.crtc_vsync_end); } + + if (crtc_state->vrr.dc_balance.enable) { + crtc_state->vrr.dc_balance.vmax = crtc_state->vrr.vmax; + crtc_state->vrr.dc_balance.vmin = crtc_state->vrr.vmin; + crtc_state->vrr.dc_balance.max_increase = + crtc_state->vrr.vmax - crtc_state->vrr.vmin; + crtc_state->vrr.dc_balance.max_decrease = + crtc_state->vrr.vmax - crtc_state->vrr.vmin; + crtc_state->vrr.dc_balance.guardband = + DIV_ROUND_UP(crtc_state->vrr.dc_balance.vmax * + DCB_CORRECTION_SENSITIVITY, 100); + crtc_state->vrr.dc_balance.slope = + DIV_ROUND_UP(DCB_CORRECTION_AGGRESSIVENESS * 10, + crtc_state->vrr.dc_balance.guardband); + crtc_state->vrr.dc_balance.vblank_target = + DIV_ROUND_UP((crtc_state->vrr.vmax - crtc_state->vrr.vmin) * + DCB_BLANK_TARGET, 100); + } } static int -- 2.48.1