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 ED25DC5321D for ; Mon, 19 Aug 2024 09:14:27 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id AD42610E227; Mon, 19 Aug 2024 09:14:27 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="furT/JCA"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.9]) by gabe.freedesktop.org (Postfix) with ESMTPS id 2F08510E227 for ; Mon, 19 Aug 2024 09:14:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1724058866; x=1755594866; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=HktWvicNwnHPjfQrnYbnm2oWVXwl5pwVME0+6ky2WAY=; b=furT/JCA/nPF+yCmFYrcr8MTylfJqZ/SPUTzF3JRps+KjEfjS69tpTlR nHm3WzxvR1qt0tk+3KkNmP0j4/TkskPi2n40Gvc/FsSFQVcdN3qd5uBAI n2oQnXomobhojFicXdzRq/KVBMSltnImkvC1QM57jALJ6mvuc6Z5yMGw+ MTj22QU5Qdz6dpDyVWO9juZSXLYnZhTfjSmyiPyT2uc7HAn2a+P+bu54l pejaOi9qN6HJh5tGJIjUK8pdgy98KlrQwjYFg29Es/WIfR0SMN4VZ6kC5 uChnG06QCnR+tSQQLuMeWQ6ZU4BUEAQGSDuzD1Bo1bUCpL1P8IRaY9tWz w==; X-CSE-ConnectionGUID: Tb7wgd7bTnK1UPFcZaWhuw== X-CSE-MsgGUID: YAqUBjfJTQ+ZpKpfd5KLQg== X-IronPort-AV: E=McAfee;i="6700,10204,11168"; a="44816313" X-IronPort-AV: E=Sophos;i="6.10,158,1719903600"; d="scan'208";a="44816313" Received: from orviesa007.jf.intel.com ([10.64.159.147]) by orvoesa101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Aug 2024 02:14:26 -0700 X-CSE-ConnectionGUID: Fh1NrUvvQW+kNq4HZJzKEg== X-CSE-MsgGUID: h7b+7bNrSvGikcophMb4zw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,158,1719903600"; d="scan'208";a="60884173" Received: from kunal-x299-aorus-gaming-3-pro.iind.intel.com ([10.190.239.13]) by orviesa007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Aug 2024 02:14:24 -0700 From: Kunal Joshi To: igt-dev@lists.freedesktop.org Cc: imre.deak@intel.com, Kunal Joshi Subject: [PATCH i-g-t 05/12] lib/igt_kms: add function to force link training failure Date: Mon, 19 Aug 2024 14:56:08 +0530 Message-Id: <20240819092615.3669803-6-kunal1.joshi@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240819092615.3669803-1-kunal1.joshi@intel.com> References: <20240819092615.3669803-1-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" add helper to force link training failure Signed-off-by: Kunal Joshi --- lib/igt_kms.c | 24 ++++++++++++++++++++++++ lib/igt_kms.h | 1 + 2 files changed, 25 insertions(+) diff --git a/lib/igt_kms.c b/lib/igt_kms.c index 05e115d9c..f6ee7ab2e 100644 --- a/lib/igt_kms.c +++ b/lib/igt_kms.c @@ -6954,3 +6954,27 @@ void igt_force_link_retrain(int drm_fd, igt_output_t *output, int retrain_count) igt_sysfs_write(dir, "i915_dp_force_link_retrain", value, sizeof(value)); close(dir); } + +/** + * igt_force_lt_failure: + * @drm_fd: A drm file descriptor + * @output: Target output + * @failure_count: 1 for same link param and + * 2 for reduced link params + * + * Returns: force lt failure + */ +void igt_force_lt_failure(int drm_fd, igt_output_t *output, int failure_count) +{ + int dir; + char value[2]; + + snprintf(value, sizeof(value), "%d", failure_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_training_failure", + value, sizeof(value)); + close(dir); +} diff --git a/lib/igt_kms.h b/lib/igt_kms.h index 4a90b5398..43bfd4a67 100644 --- a/lib/igt_kms.h +++ b/lib/igt_kms.h @@ -1258,5 +1258,6 @@ enum dp_lane_count igt_get_dp_lane_count_set_for_output(int drm_fd, igt_output_t 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); +void igt_force_lt_failure(int drm_fd, igt_output_t *output, int failure_count); #endif /* __IGT_KMS_H__ */ -- 2.43.0