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 E5074CCD183 for ; Thu, 16 Oct 2025 09:43:25 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7B94D10E997; Thu, 16 Oct 2025 09:43:25 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="HzjotLCe"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.17]) by gabe.freedesktop.org (Postfix) with ESMTPS id ADA1810E98D; Thu, 16 Oct 2025 09:43:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1760607802; x=1792143802; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=5QusbHEiPB9da9p5MIXyxUk9fI47hIfIOTuvvbQqAxc=; b=HzjotLCeyNQtUYobd4NAdI/4UqAxM00YZEYkEH4KxQ+D4vIcH9aCO3Gr B/Zk7RBBjLX+yfZEcbsHnL+05UlDXjoU5G5FU/+sH71KsLmLbzknNcMPP vet5/v6/GNexsVZLr3RgKKogwUCo4QXiUWdyCtvaaa1TSh0u68hkUGBT1 fWFJyXrydtqjR81k3nUiZ6D+v0kXd0cCD8nZPijF3ePFP2cCWLQyc3Ymh U0aBlxPwbnmvV4Va8YumjiwseEgrvl/DB3nnu42CS+8FVpMhIIQZwxNbt Bg+lIqPc8WCjJo7qYqFVd2Z2HVvLpksCAB/ACcR8gE6HMhobDF+C1lbEU w==; X-CSE-ConnectionGUID: f9DmTq+2SjijZY2R6nRjuA== X-CSE-MsgGUID: Nj1bptbKQ8uVKWdJdG2sxg== X-IronPort-AV: E=McAfee;i="6800,10657,11531"; a="62725264" X-IronPort-AV: E=Sophos;i="6.17,312,1747724400"; d="scan'208";a="62725264" Received: from orviesa001.jf.intel.com ([10.64.159.141]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Oct 2025 02:43:22 -0700 X-CSE-ConnectionGUID: nW32lZB0TuWiLtP938QDaA== X-CSE-MsgGUID: VOop1bDmQHK29DYakcXtCA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,233,1754982000"; d="scan'208";a="219570807" Received: from srr4-3-linux-103-aknautiy.iind.intel.com ([10.223.34.160]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Oct 2025 02:43:21 -0700 From: Ankit Nautiyal To: intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org Cc: ville.syrjala@linux.intel.com, Ankit Nautiyal Subject: [PATCH 4/6] drm/i915/dp: Add helper to get min sdp guardband Date: Thu, 16 Oct 2025 15:00:07 +0530 Message-ID: <20251016093009.2139105-5-ankit.k.nautiyal@intel.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20251016093009.2139105-1-ankit.k.nautiyal@intel.com> References: <20251016093009.2139105-1-ankit.k.nautiyal@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" Add a helper to compute vblank time needed for transmitting specific DisplayPort SDPs like PPS, GAMUT_METADATA, and VSC_EXT. Latency is based on line count per packet type. This will be used to ensure adequate guardband when features like DSC/HDR are enabled. Bspec: 70151 Signed-off-by: Ankit Nautiyal --- drivers/gpu/drm/i915/display/intel_dp.c | 36 +++++++++++++++++++++++++ drivers/gpu/drm/i915/display/intel_dp.h | 2 ++ 2 files changed, 38 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 7059d55687cf..3f2c319e3d6f 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -6990,3 +6990,39 @@ int intel_dp_compute_config_late(struct intel_encoder *encoder, return 0; } + +static +int intel_dp_get_lines_for_sdp(u32 type) +{ + switch (type) { + case DP_SDP_VSC_EXT_VESA: + case DP_SDP_VSC_EXT_CEA: + return 10; + case HDMI_PACKET_TYPE_GAMUT_METADATA: + return 8; + case DP_SDP_PPS: + return 6; + default: + break; + } + + return 0; +} + +int intel_dp_sdp_min_guardband(const struct intel_crtc_state *crtc_state, + bool assume_all_enabled) +{ + int sdp_guardband = 0; + + if (assume_all_enabled || + crtc_state->infoframes.enable & + intel_hdmi_infoframe_enable(HDMI_PACKET_TYPE_GAMUT_METADATA)) + sdp_guardband = max(sdp_guardband, + intel_dp_get_lines_for_sdp(HDMI_PACKET_TYPE_GAMUT_METADATA)); + + if (assume_all_enabled || + crtc_state->dsc.compression_enable) + sdp_guardband = max(sdp_guardband, intel_dp_get_lines_for_sdp(DP_SDP_PPS)); + + return sdp_guardband; +} diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h index 281ced3a3b39..7ee5aeb28fe2 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.h +++ b/drivers/gpu/drm/i915/display/intel_dp.h @@ -221,5 +221,7 @@ bool intel_dp_in_hdr_mode(const struct drm_connector_state *conn_state); int intel_dp_compute_config_late(struct intel_encoder *encoder, struct intel_crtc_state *crtc_state, struct drm_connector_state *conn_state); +int intel_dp_sdp_min_guardband(const struct intel_crtc_state *crtc_state, + bool assume_all_enabled); #endif /* __INTEL_DP_H__ */ -- 2.45.2