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d="scan'208";a="38991026" Received: from kunal-x299-aorus-gaming-3-pro.iind.intel.com ([10.190.239.13]) by fmviesa009-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Jun 2024 14:13:46 -0700 From: Kunal Joshi To: igt-dev@lists.freedesktop.org Cc: Kunal Joshi Subject: [PATCH i-g-t 5/9] lib/igt_kms: add function to force link retrain Date: Mon, 10 Jun 2024 02:55:31 +0530 Message-Id: <20240609212535.868832-6-kunal1.joshi@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240609212535.868832-1-kunal1.joshi@intel.com> References: <20240609212535.868832-1-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 can be utilized to apply previously set link rate/lane count or force link training failures [1] https://patchwork.freedesktop.org/patch/594772/?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 91cc5a347..1bd6c31a7 100644 --- a/lib/igt_kms.c +++ b/lib/igt_kms.c @@ -6744,6 +6744,50 @@ bool kmstest_force_connector_link_training_failure(int drm_fd, drmModeConnector return true; } +static bool force_connector_retrain(int drm_fd, + drmModeConnector *connector, + const char *value) +{ + return connector_attr_set_debugfs(drm_fd, connector, + "i915_dp_force_link_retrain", + value, "0"); +} + +/** + * kmstest_force_connector_force_retrain: + * @fd: drm file descriptor + * @connector: connector + * + * Force retraining on the specified connector + * and install exit handler for resetting + * + * Returns: True on success + */ +bool kmstest_force_connector_retrain(int drm_fd, drmModeConnector *connector, int retrain_count) +{ + char value[2]; + drmModeConnector *temp; + + if (!is_intel_device(drm_fd)) + return false; + + snprintf(value, sizeof(value), "%d", retrain_count); + if (!force_connector_retrain(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 5b4afec87..d58676a1e 100644 --- a/lib/igt_kms.h +++ b/lib/igt_kms.h @@ -302,6 +302,8 @@ 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_force_connector_retrain(int drm_fd, drmModeConnector *connector, + int retrain_count); bool kmstest_get_connector_default_mode(int drm_fd, drmModeConnector *connector, drmModeModeInfo *mode); -- 2.43.0