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 9C1A7C5472C for ; Sun, 25 Aug 2024 18:02:35 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 5597310E097; Sun, 25 Aug 2024 18:02:35 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="nszvu64w"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.13]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4874310E092 for ; Sun, 25 Aug 2024 18:02:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1724608953; x=1756144953; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=zBGrGyjky/sa0uPWdB1lvrg/0qkwNeDbPTlPk38xbQQ=; b=nszvu64wJkbUSD3bqxif3Ww3MgnOGczd4Y4HNqfsXn1nAluMem5xKmfZ zG2LVMR6NeylMdN7/LJGs42KfCH82cSL65VMy9oJsVH04Aj/DUrSNphst VefyaAN9jGSELLUeexVKB8RFPX7A8W/EUrnUT03vVNWsd+z6mGA4sSqbe VT5sJn5vx8WAtuhdKeaQWC19NG8XEWohEm4JXfT8QWD6r9XTYFVRa+7ps VSdUeXuIZD6jtQa5bTgsRmWM7acz/CXu6PVWpFlt4pteb41qoufezZRgt SbjPLiqOuLrLfVuYNfqAEkrnfqMmoNeFSnncux1bRxa2F4bfUbOBmj9yr Q==; X-CSE-ConnectionGUID: A9egXDQ+See3Pm7OSf4Xlw== X-CSE-MsgGUID: SA0+CYOpSFKBuRneKL006w== X-IronPort-AV: E=McAfee;i="6700,10204,11175"; a="25917453" X-IronPort-AV: E=Sophos;i="6.10,175,1719903600"; d="scan'208";a="25917453" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by fmvoesa107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Aug 2024 11:02:33 -0700 X-CSE-ConnectionGUID: IL4/1qhPTMi4IXAJWuuSsg== X-CSE-MsgGUID: u5VfYAE7Q+aylTgLiADDgg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,175,1719903600"; d="scan'208";a="85488288" Received: from kunal-x299-aorus-gaming-3-pro.iind.intel.com ([10.190.239.13]) by fmviesa002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Aug 2024 11:02:32 -0700 From: Kunal Joshi To: igt-dev@lists.freedesktop.org Cc: Kunal Joshi Subject: [PATCH i-g-t 04/14] lib/igt_kms: add function to force link retrain Date: Sun, 25 Aug 2024 23:44:14 +0530 Message-Id: <20240825181424.4034541-5-kunal1.joshi@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240825181424.4034541-1-kunal1.joshi@intel.com> References: <20240825181424.4034541-1-kunal1.joshi@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: igt-dev@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development mailing list for IGT GPU Tools List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: igt-dev-bounces@lists.freedesktop.org Sender: "igt-dev" i915_dp_force_link_retrain debugfs allow forcing retraing on the connector. add a helper to write given retraining count to the same. Signed-off-by: Kunal Joshi --- lib/igt_kms.c | 22 ++++++++++++++++++++++ lib/igt_kms.h | 1 + 2 files changed, 23 insertions(+) diff --git a/lib/igt_kms.c b/lib/igt_kms.c index 21ea8550c..553a08f2f 100644 --- a/lib/igt_kms.c +++ b/lib/igt_kms.c @@ -6821,3 +6821,25 @@ enum dp_lane_count igt_get_dp_max_lane_count(int drm_fd, igt_output_t *output) return max_lane_count; } + +/** + * igt_force_link_retrain: + * @drm_fd: A drm file descriptor + * @output: Target output + * @retrain_count: number of retraining required + * + * Force link retrain on the output. + */ +void igt_force_link_retrain(int drm_fd, igt_output_t *output, int retrain_count) +{ + int dir; + char value[2]; + + snprintf(value, sizeof(value), "%d", retrain_count); + igt_require_f(output->name, "Invalid output"); + dir = igt_debugfs_connector_dir(drm_fd, output->name, O_RDONLY); + igt_assert_f(dir >= 0, "Failed to open debugfs dir for connector %s\n", + igt_output_name(output)); + igt_sysfs_write(dir, "i915_dp_force_link_retrain", value, sizeof(value)); + close(dir); +} diff --git a/lib/igt_kms.h b/lib/igt_kms.h index 1d3226c5c..9ba8c6394 100644 --- a/lib/igt_kms.h +++ b/lib/igt_kms.h @@ -1251,5 +1251,6 @@ enum dp_link_rate igt_get_dp_link_rate_set_for_output(int drm_fd, igt_output_t * enum dp_lane_count igt_get_dp_lane_count_set_for_output(int drm_fd, igt_output_t *output); enum dp_link_rate igt_get_dp_max_link_rate(int drm_fd, igt_output_t *output); enum dp_lane_count igt_get_dp_max_lane_count(int drm_fd, igt_output_t *output); +void igt_force_link_retrain(int drm_fd, igt_output_t *output, int retrain_count); #endif /* __IGT_KMS_H__ */ -- 2.43.0