From patchwork Tue Jul 19 09:56:58 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Hogander, Jouni" X-Patchwork-Id: 12922335 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 C1241CCA47F for ; Tue, 19 Jul 2022 09:57:36 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 60F2314B270; Tue, 19 Jul 2022 09:57:34 +0000 (UTC) Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by gabe.freedesktop.org (Postfix) with ESMTPS id 13CE114B268; Tue, 19 Jul 2022 09:57:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1658224653; x=1689760653; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=qjWxo/Hr1wY/O7l2uWyacrvLYFXSrW+WJ7oIHx+q82o=; b=Qsvt3EQ+fAzl1J/8X+eVAv34Cg5il0dxU6IGHMOZVnotqd+Pp3u0SrWM t+41dIvKdRqvQ1TshSQKq8JpeX8QkHP4VFbnrpvg1MDohV/Ko9XEzQcfg 1RPeFX+1Y71lEHHhlput+DoaNWA+S+7u9xM6FBz5fvBuXUumO/clqe3a3 9e9LDgTmvsnU/c7fnbKIYXlqrQramdXbbNpckNk0ZiwkNTs47dvQK+Jnk z9dswQaaXd101EveAsRGbHvow6OsQetFz7G6fl6ATIsw4PUrnp9j1GuhB tT307ZEV7fkVr77BXj1jWyxFO9H1SDZe6w9PGsSvdY9K4dnUliDBM+MCT w==; X-IronPort-AV: E=McAfee;i="6400,9594,10412"; a="350414171" X-IronPort-AV: E=Sophos;i="5.92,283,1650956400"; d="scan'208";a="350414171" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Jul 2022 02:57:32 -0700 X-IronPort-AV: E=Sophos;i="5.92,283,1650956400"; d="scan'208";a="594776465" Received: from slinke-mobl1.ger.corp.intel.com (HELO jhogande-mobl1.ger.corp.intel.com) ([10.251.210.1]) by orsmga007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Jul 2022 02:57:29 -0700 From: =?utf-8?q?Jouni_H=C3=B6gander?= To: dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, amd-gfx@lists.freedesktop.org Subject: [PATCH v3 1/3] drm: New function to get luminance range based on static hdr metadata Date: Tue, 19 Jul 2022 12:56:58 +0300 Message-Id: <20220719095700.14923-2-jouni.hogander@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220719095700.14923-1-jouni.hogander@intel.com> References: <20220719095700.14923-1-jouni.hogander@intel.com> MIME-Version: 1.0 Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo 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 , Rodrigo Siqueira , Roman Li , Manasi Navare , Mika Kahola , =?utf-8?q?Jouni_H=C3=B6gander?= Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Split luminance min/max calculation using static hdr metadata from drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c:update_connector_ext_caps into drm/drm_edid.c and use it during edid parsing. Calculated range is stored into connector->display_info->luminance_range. Add new data structure (drm_luminance_range_inf) to store luminance range calculated using data from EDID's static hdr metadata block. Add this new struct as a part of drm_display_info struct. v3: Squashed adding drm_luminance_range_info patch here v2: Calculate range during edid parsing Cc: Roman Li Cc: Rodrigo Siqueira Cc: Harry Wentland Cc: Lyude Paul Cc: Mika Kahola Cc: Jani Nikula Cc: Manasi Navare Signed-off-by: Jouni Högander Acked-by: Jani Nikula --- drivers/gpu/drm/drm_edid.c | 52 ++++++++++++++++++++++++++++++++++++- include/drm/drm_connector.h | 21 +++++++++++++++ 2 files changed, 72 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index bbc25e3b7220..90a5e26eafa8 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -5165,6 +5165,51 @@ static void fixup_detailed_cea_mode_clock(struct drm_display_mode *mode) mode->clock = clock; } +static void drm_calculate_luminance_range(struct drm_connector *connector) +{ + struct hdr_static_metadata *hdr_metadata = &connector->hdr_sink_metadata.hdmi_type1; + struct drm_luminance_range_info *luminance_range = + &connector->display_info.luminance_range; + static const u8 pre_computed_values[] = { + 50, 51, 52, 53, 55, 56, 57, 58, 59, 61, 62, 63, 65, 66, 68, 69, + 71, 72, 74, 75, 77, 79, 81, 82, 84, 86, 88, 90, 92, 94, 96, 98 + }; + u32 max_avg, min_cll, max, min, q, r; + + if (!(hdr_metadata->metadata_type & BIT(HDMI_STATIC_METADATA_TYPE1))) + return; + + max_avg = hdr_metadata->max_fall; + min_cll = hdr_metadata->min_cll; + + /* + * From the specification (CTA-861-G), for calculating the maximum + * luminance we need to use: + * Luminance = 50*2**(CV/32) + * Where CV is a one-byte value. + * For calculating this expression we may need float point precision; + * to avoid this complexity level, we take advantage that CV is divided + * by a constant. From the Euclids division algorithm, we know that CV + * can be written as: CV = 32*q + r. Next, we replace CV in the + * Luminance expression and get 50*(2**q)*(2**(r/32)), hence we just + * need to pre-compute the value of r/32. For pre-computing the values + * We just used the following Ruby line: + * (0...32).each {|cv| puts (50*2**(cv/32.0)).round} + * The results of the above expressions can be verified at + * pre_computed_values. + */ + q = max_avg >> 5; + r = max_avg % 32; + max = (1 << q) * pre_computed_values[r]; + + /* min luminance: maxLum * (CV/255)^2 / 100 */ + q = DIV_ROUND_CLOSEST(min_cll, 255); + min = max * DIV_ROUND_CLOSEST((q * q), 100); + + luminance_range->min_luminance = min; + luminance_range->max_luminance = max; +} + static uint8_t eotf_supported(const u8 *edid_ext) { return edid_ext[2] & @@ -5196,8 +5241,12 @@ drm_parse_hdr_metadata_block(struct drm_connector *connector, const u8 *db) connector->hdr_sink_metadata.hdmi_type1.max_cll = db[4]; if (len >= 5) connector->hdr_sink_metadata.hdmi_type1.max_fall = db[5]; - if (len >= 6) + if (len >= 6) { connector->hdr_sink_metadata.hdmi_type1.min_cll = db[6]; + + /* Calculate only when all values are available */ + drm_calculate_luminance_range(connector); + } } static void @@ -6101,6 +6150,7 @@ static void drm_reset_display_info(struct drm_connector *connector) info->non_desktop = 0; memset(&info->monitor_range, 0, sizeof(info->monitor_range)); + memset(&info->luminance_range, 0, sizeof(info->luminance_range)); info->mso_stream_count = 0; info->mso_pixel_overlap = 0; diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index 2c6fa746efac..248206bbd975 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -323,6 +323,22 @@ struct drm_monitor_range_info { u8 max_vfreq; }; +/** + * struct drm_luminance_range_info - Panel's luminance range for + * &drm_display_info. Calculated using data in EDID + * + * This struct is used to store a luminance range supported by panel + * as calculated using data from EDID's static hdr metadata. + * + * @min_luminance: This is the min supported luminance value + * + * @max_luminance: This is the max supported luminance value + */ +struct drm_luminance_range_info { + u32 min_luminance; + u32 max_luminance; +}; + /** * enum drm_privacy_screen_status - privacy screen status * @@ -624,6 +640,11 @@ struct drm_display_info { */ struct drm_monitor_range_info monitor_range; + /** + * @luminance_range: Luminance range supported by panel + */ + struct drm_luminance_range_info luminance_range; + /** * @mso_stream_count: eDP Multi-SST Operation (MSO) stream count from * the DisplayID VESA vendor block. 0 for conventional Single-Stream