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d="scan'208";a="60884166" 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 02:14:22 -0700 From: Kunal Joshi To: igt-dev@lists.freedesktop.org Cc: imre.deak@intel.com, Kunal Joshi Subject: [PATCH i-g-t 04/12] lib/igt_kms: add function to force link retrain Date: Mon, 19 Aug 2024 14:56:07 +0530 Message-Id: <20240819092615.3669803-5-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 two helper one allows to set and restore to specified default value on exit, while the second only allows forcing link retrain without any restoration Signed-off-by: Kunal Joshi --- lib/igt_kms.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++ lib/igt_kms.h | 3 +++ 2 files changed, 70 insertions(+) diff --git a/lib/igt_kms.c b/lib/igt_kms.c index 1115a0b93..05e115d9c 100644 --- a/lib/igt_kms.c +++ b/lib/igt_kms.c @@ -6772,6 +6772,51 @@ bool kmstest_force_connector_link_rate(int drm_fd, drmModeConnector *connector, 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, "1"); +} + +/** + * kmstest_force_connector_force_retrain: + * @fd: drm file descriptor + * @connector: connector + * @retrain_count: number of time to retrain + * + * 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 @@ -6887,3 +6932,25 @@ 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 retrain the link on given 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 b65c478c9..4a90b5398 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, const char *lane); bool kmstest_force_connector_link_rate(int drm_fd, drmModeConnector *connector, const char *link); +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); @@ -1255,5 +1257,6 @@ 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