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 7D14EEA718F for ; Mon, 20 Apr 2026 11:31:03 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0A37710E504; Mon, 20 Apr 2026 11:31:03 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="Wu1J6B1O"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.15]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5B2B910E502; Mon, 20 Apr 2026 11:31:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1776684660; x=1808220660; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=nbgCHKgtC+xHSckl4WD/kC+YXa11+xiBffQGqU1U+o0=; b=Wu1J6B1OQbeNhtu4lRQRkXa1tMvBz7wedAnk98rz3cvVAILQ7v7uhjq2 WSwWhYB589JrzAIyHYdNqYY2yyPvSkcBN+MIGHxT+tQrBQI2n+Z8rvRJH oMuDh2nB0lgMiJw68brC/DEnfgPuV93vGdMRGJ0rgLpHBt88SJ2qQbkIY L6b9SMn0RLeWR4GYcoKrcPi/KgaJNz/WQmzCgBTJiPZFbn3OdsRieGQVF WlkdWmhlJZNWRJto7PrvJ3jeBZtf7047KmjHENiMmmUvG6DWe1tc60o1A BpREfEZsl6w95ujkyLi/EWSZVJkUfMZJyhvN5b0VUDnbIJ8BmAlRgXawP Q==; X-CSE-ConnectionGUID: Y+2n0m1UTtq4CryI0yoaEg== X-CSE-MsgGUID: +hz/+ZSZTS2DkV3MCWmUcw== X-IronPort-AV: E=McAfee;i="6800,10657,11762"; a="77722752" X-IronPort-AV: E=Sophos;i="6.23,189,1770624000"; d="scan'208";a="77722752" Received: from orviesa005.jf.intel.com ([10.64.159.145]) by fmvoesa109.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Apr 2026 04:31:00 -0700 X-CSE-ConnectionGUID: NhUkKW9KRtSn9xFGkFEf3g== X-CSE-MsgGUID: EFiy5bnKS+uOZemh8l7k0g== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,189,1770624000"; d="scan'208";a="236690611" Received: from nemesa.iind.intel.com ([10.190.239.22]) by orviesa005.jf.intel.com with ESMTP; 20 Apr 2026 04:30:58 -0700 From: Nemesa Garg To: intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org Cc: Nemesa Garg Subject: [PATCH 2/2] drm/i915/dp: Decode DSC max delta bpp from sink DPCD Date: Mon, 20 Apr 2026 16:56:11 +0530 Message-Id: <20260420112611.1481530-3-nemesa.garg@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260420112611.1481530-1-nemesa.garg@intel.com> References: <20260420112611.1481530-1-nemesa.garg@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" Add intel_dp_dsc_max_delta_bppx16() to parse sink DSC max delta bpp from DPCD when DP_DSC_MAX_BPP_DELTA_AVAILABILITY is set. The helper decodes RGB/YCbCr444 delta range and YCbCr420 delta range from DP_DSC_MAX_BPP_DELTA. Signed-off-by: Nemesa Garg --- drivers/gpu/drm/i915/display/intel_dp.c | 40 +++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 35b8fb5740aa..7cc760aedd59 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -2169,6 +2169,41 @@ static int dsc_compute_link_config(struct intel_dp *intel_dp, return -EINVAL; } +static u16 intel_dp_dsc_max_delta_bppx16(const struct intel_connector *connector, + enum intel_output_format output_format) +{ + const u8 *dsc_dpcd = connector->dp.dsc_dpcd; + + if (dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_HI - DP_DSC_SUPPORT] & + DP_DSC_MAX_BPP_DELTA_AVAILABILITY) { + int max_bpp_delta = 0; + + switch (output_format) { + case INTEL_OUTPUT_FORMAT_RGB: + case INTEL_OUTPUT_FORMAT_YCBCR444: + max_bpp_delta = dsc_dpcd[DP_DSC_MAX_BPP_DELTA - DP_DSC_SUPPORT] & + DP_DSC_RGB_YCbCr444_MAX_BPP_DELTA_MASK; + if (max_bpp_delta >= 1 && max_bpp_delta <= 21) + max_bpp_delta = max_bpp_delta + MIN_DSC_BPP_DELTA_444 - 1; + break; + case INTEL_OUTPUT_FORMAT_YCBCR420: + max_bpp_delta = (dsc_dpcd[DP_DSC_MAX_BPP_DELTA - DP_DSC_SUPPORT] & + DP_DSC_RGB_YCbCr420_MAX_BPP_DELTA_MASK) >> + BPP_DELTA_SHIFT_420; + if (max_bpp_delta >= 1 && max_bpp_delta <= 7) + max_bpp_delta = max_bpp_delta + MIN_DSC_BPP_DELTA_420 - 1; + break; + default: + MISSING_CASE(output_format); + return 0; + } + + return max_bpp_delta << 4; + } + + return 0; +} + static u16 intel_dp_dsc_max_sink_compressed_bppx16(const struct intel_connector *connector, enum intel_output_format output_format, @@ -2176,6 +2211,11 @@ u16 intel_dp_dsc_max_sink_compressed_bppx16(const struct intel_connector *connec { u16 max_bppx16 = drm_edp_dsc_sink_output_bpp(connector->dp.dsc_dpcd); + if (max_bppx16) + return max_bppx16; + + max_bppx16 = intel_dp_dsc_max_delta_bppx16(connector, output_format); + if (max_bppx16) return max_bppx16; /* -- 2.25.1