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 90D1FC5472C for ; Sun, 25 Aug 2024 19:54:24 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 53D5710E103; Sun, 25 Aug 2024 19:54:24 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="K3yQ2CIP"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.11]) by gabe.freedesktop.org (Postfix) with ESMTPS id 71F3F10E103 for ; Sun, 25 Aug 2024 19:54:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1724615663; x=1756151663; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=4UNSQlZqCSmZ7cQ2dmmHkoZnxPucvtvrMpJy5fPYBOE=; b=K3yQ2CIPArKDZB+5nVJtLCf9c8ekHD7L3Ulgl7QbpaQeVJInjXZbpm9Y zZwsIP4Ot2CbEKPjI71wSEtwbHH1OCycKSIFKSqxe+JqbMDkx4MyVbPie TWw09lx4cZFfL3u8JM9yA3SvUHnbtj6KdWuAgY3sD0FrwRf5FawJTzdED a01U0WEMh7uWMbiIaCLk4k6rSOWJKELavH+GyAA3lkMFrOvCaDHZDoa9K P6dy9J/N/i0qYrbu5sQtHr3+/QzYnsHWBUQp1nBaWtsa1PSWXZXXf5f/8 WSt5bHtgPyinJAsXauSHt5y4KjCa2xi6rL4WhQxzqxA+VIi/N7U6mTFwF g==; X-CSE-ConnectionGUID: rBg4dt2cTGO92Dhut4Hl9A== X-CSE-MsgGUID: +ZxRRv7CR9SLGdLCGEog8g== X-IronPort-AV: E=McAfee;i="6700,10204,11175"; a="33591466" X-IronPort-AV: E=Sophos;i="6.10,175,1719903600"; d="scan'208";a="33591466" Received: from orviesa009.jf.intel.com ([10.64.159.149]) by orvoesa103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Aug 2024 12:54:23 -0700 X-CSE-ConnectionGUID: Y6zlgS0yRYqGog9awSOqBg== X-CSE-MsgGUID: z2C6arB+RoiKVzVwrIrvEQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,175,1719903600"; d="scan'208";a="62283663" Received: from kunal-x299-aorus-gaming-3-pro.iind.intel.com ([10.190.239.13]) by orviesa009-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Aug 2024 12:54:22 -0700 From: Kunal Joshi To: igt-dev@lists.freedesktop.org Cc: Kunal Joshi Subject: [PATCH i-g-t 05/14] lib/igt_kms: add function to force link training failure Date: Mon, 26 Aug 2024 01:36:03 +0530 Message-Id: <20240825200612.4036178-6-kunal1.joshi@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240825200612.4036178-1-kunal1.joshi@intel.com> References: <20240825200612.4036178-1-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_training_failure debugfs file is used to force link training failure. add a function to force link training failure. Signed-off-by: Kunal Joshi --- lib/igt_kms.c | 26 ++++++++++++++++++++++++++ lib/igt_kms.h | 1 + 2 files changed, 27 insertions(+) diff --git a/lib/igt_kms.c b/lib/igt_kms.c index 553a08f2f..683989e84 100644 --- a/lib/igt_kms.c +++ b/lib/igt_kms.c @@ -6843,3 +6843,29 @@ 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 + * + * Force link training failure on the output. + * @failure_count: 1 for retraining with same link params + * 2 for retraining with reduced link params + */ +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 9ba8c6394..57829416a 100644 --- a/lib/igt_kms.h +++ b/lib/igt_kms.h @@ -1252,5 +1252,6 @@ 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__ */ -- 2.34.1