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 15F18CCD1BF for ; Thu, 23 Oct 2025 09:09:16 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B5EAD10E38E; Thu, 23 Oct 2025 09:09:15 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="BvqlZMRp"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.15]) by gabe.freedesktop.org (Postfix) with ESMTPS id 891C910E375; Thu, 23 Oct 2025 09:09:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1761210553; x=1792746553; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=3pHRuTt954iCUGc2C6ONJ+TdLdzlfnXNM2pTaVMezTI=; b=BvqlZMRpAUrmz56ydUIouyX8tPdoSMm4LMPix7yc9LJmeOuVyHLSPl2W /YsTUfKuQmNJkCubNyczNquV3PGO8mr77gkb4BWpR6wu/17v1QqF45MMe nR8EYLLKB4KNh6jBTc4T78ToFYA0Kngwt4f0Gwc0FNqyM2OzHC9ucj0+r qQiUh903ntG4oPRyJ988wh48RNOHgkMOWGjE4INNRvtgQNrmHPJ5FMhOq 51gtCPyFcsj++LNCbP7vdVPWZ4EY1nzAyxZ96TFLo2eczTfhTXvMuYZhW OuGrvHyyGSTq1l3kZv7w9DyDtiFqtHLbqztfgKLZJz07GWqbeO2n1A3Of Q==; X-CSE-ConnectionGUID: dZ/OC1dBQMeSTIQVjmyHmA== X-CSE-MsgGUID: NRNjXhwNRvC1rzBl6/LM1Q== X-IronPort-AV: E=McAfee;i="6800,10657,11586"; a="67020686" X-IronPort-AV: E=Sophos;i="6.19,249,1754982000"; d="scan'208";a="67020686" Received: from orviesa010.jf.intel.com ([10.64.159.150]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Oct 2025 02:09:13 -0700 X-CSE-ConnectionGUID: nvA7ypI4RymBOe5To1BWGQ== X-CSE-MsgGUID: EfTav1BERv2I95zXk/vpyg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,249,1754982000"; d="scan'208";a="183329477" Received: from srr4-3-linux-101-amanna.iind.intel.com ([10.223.74.76]) by orviesa010.jf.intel.com with ESMTP; 23 Oct 2025 02:09:11 -0700 From: Animesh Manna To: intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org Cc: Animesh Manna , =?UTF-8?q?Jouni=20H=C3=B6gander?= Subject: [PATCH 8/8] drm/i915/alpm: Program lttpr count for DP 2.1 alpm Date: Thu, 23 Oct 2025 14:11:47 +0530 Message-Id: <20251023084147.572535-9-animesh.manna@intel.com> X-Mailer: git-send-email 2.29.0 In-Reply-To: <20251023084147.572535-1-animesh.manna@intel.com> References: <20251023084147.572535-1-animesh.manna@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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" Issue a aux write transaction to dpcd 0xf000a with total number of lttpr before link traning. Cc: Jouni Högander Signed-off-by: Animesh Manna --- .../gpu/drm/i915/display/intel_dp_link_training.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c index 27f3716bdc1f..b1e3ab3f8efc 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c @@ -1623,6 +1623,16 @@ intel_dp_128b132b_link_train(struct intel_dp *intel_dp, return passed; } +static void intel_dp_update_lttpr_count(struct intel_dp *intel_dp, + int lttpr_count) +{ + if (!intel_dp_is_edp(intel_dp) || + intel_dp->lttpr_common_caps[0] <= 0x20) + return; + + drm_dp_dpcd_writeb(&intel_dp->aux, DP_TOTAL_LTTPR_CNT, lttpr_count); +} + /** * intel_dp_start_link_train - start link training * @state: Atomic state @@ -1659,6 +1669,8 @@ void intel_dp_start_link_train(struct intel_atomic_state *state, intel_dp_prepare_link_train(intel_dp, crtc_state); + intel_dp_update_lttpr_count(intel_dp, lttpr_count); + if (intel_dp_is_uhbr(crtc_state)) passed = intel_dp_128b132b_link_train(intel_dp, crtc_state, lttpr_count); else -- 2.29.0