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 4035BCCD1A3 for ; Fri, 17 Oct 2025 05:15:12 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id BFBD210EAFE; Fri, 17 Oct 2025 05:15:11 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="TyK0NlKk"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.7]) by gabe.freedesktop.org (Postfix) with ESMTPS id DF84A10EAFC; Fri, 17 Oct 2025 05:15:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1760678111; x=1792214111; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=5QusbHEiPB9da9p5MIXyxUk9fI47hIfIOTuvvbQqAxc=; b=TyK0NlKksKtbIWtj3pgN5Ip27U7HhdWVDQ/IGmHG4ELropdEoiFAu+RF pugX8+l7mCFYHZjTW/gBz4+JuJhLS4cIrCSkF3tGBgdiO2dPjDzgOEBO+ IAdAAAY8rK7az+PH8Ci+uRWqhgSIOoyeAPbwa5Kk98YIcHiLVORjJ8ib+ DM2+BfRMHNF3/Y7csBd1tDC9GRwGNad7y+BeYouAK5uS6chTecridhMpD S/wOSrMhMEaYWcc9g7iHoX0Zgmz3MXGZabcpVq94aD+LuHU55x3gIW44t Ik4wJlPYLJxb+u4uA4osO73VBm5ZOhzlOzSEIvtyc93gCPEuq0E+CIKC/ w==; X-CSE-ConnectionGUID: n8v9u35SQyqLRQIHjyCGqg== X-CSE-MsgGUID: LwUGukU1Ttqx/k0oPUEMAw== X-IronPort-AV: E=McAfee;i="6800,10657,11584"; a="88352609" X-IronPort-AV: E=Sophos;i="6.19,234,1754982000"; d="scan'208";a="88352609" Received: from fmviesa006.fm.intel.com ([10.60.135.146]) by fmvoesa101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Oct 2025 22:15:11 -0700 X-CSE-ConnectionGUID: Z/kyCfgFTCat0vsFWRELwQ== X-CSE-MsgGUID: 8lb10PSzQ8qbQlR9++uzMA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,234,1754982000"; d="scan'208";a="182576558" Received: from srr4-3-linux-103-aknautiy.iind.intel.com ([10.223.34.160]) by fmviesa006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Oct 2025 22:15:09 -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 2/5] drm/i915/dp: Add helper to get min sdp guardband Date: Fri, 17 Oct 2025 10:31:59 +0530 Message-ID: <20251017050202.2211985-3-ankit.k.nautiyal@intel.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20251017050202.2211985-1-ankit.k.nautiyal@intel.com> References: <20251017050202.2211985-1-ankit.k.nautiyal@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 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