From patchwork Mon Feb 24 17:26:36 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Ville Syrjala X-Patchwork-Id: 13988574 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 54E73C021BC for ; Mon, 24 Feb 2025 17:26:51 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C3C7110E351; Mon, 24 Feb 2025 17:26:50 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="ZlTWVqot"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.10]) by gabe.freedesktop.org (Postfix) with ESMTPS id D681210E347; Mon, 24 Feb 2025 17:26:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1740418010; x=1771954010; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=eAoQmvB1/5uFup65O8Oyst1eOy94uFJZn6f1HXRiyWo=; b=ZlTWVqot6y+qNldJM6pVErpaGs9iLRnRsodAzpX0U8NjCJ2zuFATyEMP Xh/GUy/qJCbbNQVBIvR9EWabTPhnx4M/DkqyQEMAu7zfKtcTsdDOGoRYh XVIz3CLVCE5ySQaJHZuH9EjmA8QTnaUKNxXWR1v0t26YYZL2aYwSrqpnD UVlTchndc5w1SVAy7yu4TJ4xDQS+ZmTXA5A38FntqynxVSCgNTUw0fnQ0 Ofo3d012cvLdCT0BS/0MDbNDvF9dFpqgkxrM5cmHsEnGSGIuYwQRW7OCH NRzzpxV48H3KTmkjpsQSTJ95Rdzg0vgqOYH7iwsDbqEhoH0qXgPoUGD2N Q==; X-CSE-ConnectionGUID: QzDcs2SaR7ex5JLtW2JcTQ== X-CSE-MsgGUID: XTX2IVRsTOGS4QzQK2XsMQ== X-IronPort-AV: E=McAfee;i="6700,10204,11355"; a="58601706" X-IronPort-AV: E=Sophos;i="6.13,312,1732608000"; d="scan'208";a="58601706" Received: from orviesa005.jf.intel.com ([10.64.159.145]) by orvoesa102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Feb 2025 09:26:50 -0800 X-CSE-ConnectionGUID: L2jYOjjYQIS8GrPNMvvdNw== X-CSE-MsgGUID: laHDoFzuSw644Hq/mabelg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.12,224,1728975600"; d="scan'208";a="121374089" Received: from stinkpipe.fi.intel.com (HELO stinkbox) ([10.237.72.74]) by orviesa005.jf.intel.com with SMTP; 24 Feb 2025 09:26:47 -0800 Received: by stinkbox (sSMTP sendmail emulation); Mon, 24 Feb 2025 19:26:45 +0200 From: Ville Syrjala To: intel-gfx@lists.freedesktop.org Cc: intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH 0/9] drm/i915/dp: Implement POST_LT_ADJ_REQ Date: Mon, 24 Feb 2025 19:26:36 +0200 Message-ID: <20250224172645.15763-1-ville.syrjala@linux.intel.com> X-Mailer: git-send-email 2.45.3 MIME-Version: 1.0 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: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Ville Syrjälä Implement the POST_LT_ADJ_REQ sequence, which is supposed to be used to further tune the link vswing/pre-emphasis when TPS4 is not supported. Unfortunately I don't have any displays/dongles that support this so I wasn't able to test anything. Hopefully CI has something... Ville Syrjälä (9): drm/dp: Add definitions for POST_LT_ADJ training sequence drm/dp: Add POST_LT_ADJ_REQ helpers drm/i915/dp: Clear DPCD training pattern before transmitting the idle pattern drm/i915/dp: Have intel_dp_get_adjust_train() tell us if anything changed drm/i915/dp: Implement the POST_LT_ADJ_REQ sequence drm/i915/dp: Move intel_dp_training_pattern() drm/i915/dp: Implement .set_idle_link_train() for everyone drm/i915/dp: Make .set_idle_link_train() mandatory hax: drm/i915: Disable TPS4 support to force POST_LT_ADJ_REQ usage drivers/gpu/drm/display/drm_dp_helper.c | 8 + drivers/gpu/drm/i915/display/g4x_dp.c | 33 ++- .../drm/i915/display/intel_dp_link_training.c | 267 +++++++++++++----- .../drm/i915/display/intel_dp_link_training.h | 4 +- drivers/gpu/drm/i915/display/intel_dp_mst.c | 2 +- include/drm/display/drm_dp.h | 3 + include/drm/display/drm_dp_helper.h | 8 + 7 files changed, 253 insertions(+), 72 deletions(-)