From patchwork Mon Feb 14 02:03:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Kulkarni, Vandita" X-Patchwork-Id: 12745338 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 8EBE9C433F5 for ; Mon, 14 Feb 2022 10:01:33 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 96DE610E307; Mon, 14 Feb 2022 10:01:28 +0000 (UTC) Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTPS id C26C710E2E4; Mon, 14 Feb 2022 10:01:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1644832879; x=1676368879; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Z7xVn7vqsWJP347O5nlTQsHxfP99/kjdvqaUPmMHyrE=; b=dGkmXmH/pjInp9kGRMKkEIsBUDPSm6wY6O9aSN2Nv5GUVc63/PcyVdik NKwkfQT6hZhrYk/HutVpoENXcQZAYZhzouKevg8IntD91XPVjzOpTs05T p9aEwc11fXNDK17wSY6imPKQ34BURMB0gOU24QXMEsvL+EmW9npY0Y6Tv J3T5HID21kLJ3bUCVpVoBUwbkrUTi+uXasgyIV6PtCuuzRtXeD7ddfJmx EoVbRD3kbZHpV1MbR712ERdHfChCCoezG9EIVq1h7sLKfdOwImz19IbeQ i/zPTU8t4BG4nzVa4RtAXXOvOyG/J2LkxdbUwOYFYCfqxXlX0bGpn3AH+ w==; X-IronPort-AV: E=McAfee;i="6200,9189,10257"; a="274628542" X-IronPort-AV: E=Sophos;i="5.88,367,1635231600"; d="scan'208";a="274628542" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Feb 2022 02:01:19 -0800 X-IronPort-AV: E=Sophos;i="5.88,367,1635231600"; d="scan'208";a="543383161" Received: from unknown (HELO vandita-Z390-AORUS-ULTRA.iind.intel.com) ([10.190.238.8]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Feb 2022 02:01:17 -0800 From: Vandita Kulkarni To: dri-devel@lists.freedesktop.org Subject: [RFC v2 1/5] drm/hdmi21: Define frl_dfm structure Date: Mon, 14 Feb 2022 07:33:53 +0530 Message-Id: <20220214020357.10063-2-vandita.kulkarni@intel.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220214020357.10063-1-vandita.kulkarni@intel.com> References: <20220214020357.10063-1-vandita.kulkarni@intel.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jani.nikula@intel.com, intel-gfx@lists.freedesktop.org, Vandita Kulkarni , uma.shankar@intel.com, laurent.pinchart@ideasonboard.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Define frl_dfm structure to hold frl characteristics needed for frl capacity computation in order to meet the data flow metering requirement. Signed-off-by: Vandita Kulkarni --- include/drm/drm_frl_dfm_helper.h | 124 +++++++++++++++++++++++++++++++ 1 file changed, 124 insertions(+) create mode 100644 include/drm/drm_frl_dfm_helper.h diff --git a/include/drm/drm_frl_dfm_helper.h b/include/drm/drm_frl_dfm_helper.h new file mode 100644 index 000000000000..5cab102fe25f --- /dev/null +++ b/include/drm/drm_frl_dfm_helper.h @@ -0,0 +1,124 @@ +/* SPDX-License-Identifier: MIT + * Copyright © 2022 Intel Corp + */ + +#ifndef DRM_FRL_DFM_H_ +#define DRM_FRL_DFM_H_ + +/* DFM constraints and tolerance values from HDMI2.1 spec */ +#define TB_BORROWED_MAX 400 +#define FRL_CHAR_PER_CHAR_BLK 510 +/* Tolerance pixel clock unit is in mHz */ +#define TOLERANCE_PIXEL_CLOCK 5 +#define TOLERANCE_FRL_BIT_RATE 300 +#define TOLERANCE_AUDIO_CLOCK 1000 +#define ACR_RATE_MAX 1500 +#define EFFICIENCY_MULTIPLIER 1000 +#define OVERHEAD_M (3 * EFFICIENCY_MULTIPLIER / 1000) +#define BPP_MULTIPLIER 16 +#define FRL_TIMING_NS_MULTIPLIER 1000000000 + +/* ALl the input config needed to compute DFM requirements */ +struct drm_frl_dfm_input_config { + /* + * Pixel clock rate kHz, when FVA is + * enabled this rate is the rate after adjustment + */ + unsigned int pixel_clock_nominal_khz; + + /* active pixels per line */ + unsigned int hactive; + + /* Blanking pixels per line */ + unsigned int hblank; + + /* Bits per component */ + unsigned int bpc; + + /* Pixel encoding */ + unsigned int color_format; + + /* FRL bit rate in kbps */ + unsigned int bit_rate_kbps; + + /* FRL lanes */ + unsigned int lanes; + + /* Number of audio channels */ + unsigned int audio_channels; + + /* Audio rate in Hz */ + unsigned int audio_hz; + + /* Selected bpp target value */ + unsigned int target_bpp_16; + + /* + * Number of horizontal pixels in a slice. + * Equivalent to PPS parameter slice_width + */ + unsigned int slice_width; +}; + +/* Computed dfm parameters as per the HDMI2.1 spec */ +struct drm_frl_dfm_params { + /* + * Link overhead in percentage + * multiplied by 1000 (efficiency multiplier) + */ + unsigned int overhead_max; + + /* Maximum pixel rate in kHz */ + unsigned int pixel_clock_max_khz; + + /* Minimum video line period in nano sec */ + unsigned int line_time_ns; + + /* worst case slow frl character rate in kbps */ + unsigned int char_rate_min_kbps; + + /* minimum total frl charecters per line perios */ + unsigned int cfrl_line; + + /* Average tribyte rate in khz */ + unsigned int ftb_avg_k; + + /* Audio characteristics */ + + /* number of audio packets needed during hblank */ + unsigned int num_audio_pkts_line; + + /* + * Minimum required hblank assuming no control preiod + * RC compression + */ + unsigned int hblank_audio_min; + + /* Number of tribytes required to carry active video */ + unsigned int tb_active; + + /* Total available tribytes during the blanking period */ + unsigned int tb_blank; + + /* + * Number of tribytes required to be transmitted during + * the hblank period + */ + unsigned int tb_borrowed; + + /* DSC frl characteristics */ + + /* Tribytes required to carry the target bpp */ + unsigned int hcactive_target; + + /* tribytes available during blanking with target bpp */ + unsigned int hcblank_target; +}; + +/* FRL DFM structure to hold involved in DFM computation */ +struct drm_hdmi_frl_dfm { + struct drm_frl_dfm_input_config config; + struct drm_frl_dfm_params params; +}; + +#endif