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d="scan'208";a="59321722" Received: from linux-meteor-lake-client-platform.iind.intel.com ([10.190.219.196]) by ORVIESA003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Jul 2024 14:35:48 -0700 From: Kunal Joshi To: igt-dev@lists.freedesktop.org Cc: imre.deak@intel.com, Kunal Joshi Subject: [PATCH i-g-t 04/10] lib/igt_kms: add function to force link training failure Date: Wed, 31 Jul 2024 02:43:35 +0530 Message-ID: <20240730211343.58703-5-kunal1.joshi@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240730211343.58703-1-kunal1.joshi@intel.com> References: <20240730211343.58703-1-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" [1] exposes interface which allows to force link training failure on given connector. writing below integer value does following action 1: retry current link paramaeter 2: reduce link rate/ lane count (in order respectively) [1] https://patchwork.freedesktop.org/patch/594767/?series=133624&rev=3 Signed-off-by: Kunal Joshi --- lib/igt_kms.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ lib/igt_kms.h | 2 ++ 2 files changed, 46 insertions(+) diff --git a/lib/igt_kms.c b/lib/igt_kms.c index 6d2144483..dd43d655a 100644 --- a/lib/igt_kms.c +++ b/lib/igt_kms.c @@ -6781,6 +6781,50 @@ bool kmstest_force_connector_link_rate(int drm_fd, drmModeConnector *connector, return true; } +static bool force_connector_link_training_failure(int drm_fd, + drmModeConnector *connector, + const char *value) +{ + return connector_attr_set_debugfs(drm_fd, connector, + "i915_dp_force_link_training_failure", + value, "0"); +} + +/** + * kmstest_force_connector_force_training_failure: + * @fd: drm file descriptor + * @connector: connector + * + * Force link training failure on the specified connector + * and install exit handler for resetting + * + * Returns: True on success + */ +bool kmstest_force_connector_link_training_failure(int drm_fd, drmModeConnector *connector, int train_count) +{ + char value[2]; + drmModeConnector *temp; + + if (!is_intel_device(drm_fd)) + return false; + + snprintf(value, sizeof(value), "%d", train_count); + if (!force_connector_link_training_failure(drm_fd, connector, value)) + return false; + + dump_connector_attrs(); + igt_install_exit_handler(reset_connectors_at_exit); + + /* + * To allow callers to always use GetConnectorCurrent we need to force a + * redetection here. + */ + temp = drmModeGetConnector(drm_fd, connector->connector_id); + drmModeFreeConnector(temp); + + return true; +} + /** * igt_get_dp_link_rate_set_for_output: * @drm_fd: A drm file descriptor diff --git a/lib/igt_kms.h b/lib/igt_kms.h index 4ffe03bfc..f5b3017d3 100644 --- a/lib/igt_kms.h +++ b/lib/igt_kms.h @@ -292,6 +292,8 @@ bool kmstest_force_connector_lane_count(int drm_fd, drmModeConnector *connector, int lane_count); bool kmstest_force_connector_link_rate(int drm_fd, drmModeConnector *connector, int link_rate); +bool kmstest_force_connector_link_training_failure(int drm_fd, drmModeConnector *connector, + int train_count); bool kmstest_get_connector_default_mode(int drm_fd, drmModeConnector *connector, drmModeModeInfo *mode); -- 2.43.0