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 6CD18C52D1D for ; Tue, 30 Jul 2024 21:35:51 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3186010E305; Tue, 30 Jul 2024 21:35:51 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="iJCMfK+w"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.10]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0AD2410E1D1 for ; Tue, 30 Jul 2024 21:35:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; 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d="scan'208";a="59321716" 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 14:35:45 -0700 From: Kunal Joshi To: igt-dev@lists.freedesktop.org Cc: imre.deak@intel.com, Kunal Joshi Subject: [PATCH i-g-t 02/10] lib/igt_kms: add function to force/read a target link rate/lane count Date: Wed, 31 Jul 2024 02:43:33 +0530 Message-ID: <20240730211343.58703-3-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] allows to force/read link rate/lane count for a particular connector. add functions to retrieve and write data to newly exposed interface [1] https://patchwork.freedesktop.org/patch/594770/?series=133624&rev=3 Signed-off-by: Kunal Joshi --- lib/igt_kms.c | 176 ++++++++++++++++++++++++++++++++++++++++++++++++++ lib/igt_kms.h | 7 ++ 2 files changed, 183 insertions(+) diff --git a/lib/igt_kms.c b/lib/igt_kms.c index 64318ef7f..a21ab0bc8 100644 --- a/lib/igt_kms.c +++ b/lib/igt_kms.c @@ -6662,3 +6662,179 @@ int get_num_scalers(int drm_fd, enum pipe pipe) return num_scalers; } + +void read_link_rates(int drm_fd, uint64_t *link_rates, int *num_rates, igt_output_t *output) +{ + char buf[1024]; + const char *delimiters = " []*"; + int count = 0; + int dir, res, rate; + char *token; + + igt_require_f(output->name, "Invalid output"); + dir = igt_debugfs_connector_dir(drm_fd, output->name, O_DIRECTORY); + igt_assert_f(dir >= 0, "Failed to open debugfs dir for connector %s\n", + igt_output_name(output)); + res = igt_debugfs_simple_read(dir, "i915_dp_force_link_rate", + buf, sizeof(buf)); + close(dir); + igt_require_f(res > 0, "Couldn't read i915_dp_force_link_rate"); + buf[strcspn(buf, "\n")] = 0; + token = strtok(buf, delimiters); + + while (token != NULL && count < DP_MAX_LINK_RATE_COUNT) { + rate = atoi(token); + if (rate != 0) + link_rates[count++] = rate; + token = strtok(NULL, delimiters); + } + *num_rates = count; +} + +static bool force_connector_lane_count(int drm_fd, + drmModeConnector *connector, + const char *value) +{ + return connector_attr_set_debugfs(drm_fd, connector, + "i915_dp_force_lane_count", + value, "auto"); +} + +/** + * kmstest_force_connector_lane_count: + * @fd: drm file descriptor + * @connector: connector + * @lane_count: lane count + * + * Force lane count on the specified connector + * and install exit handler for resetting + * + * Returns: True on success + */ +bool kmstest_force_connector_lane_count(int drm_fd, drmModeConnector *connector, int lane_count) +{ + char value[2]; + drmModeConnector *temp; + + if (!is_intel_device(drm_fd)) + return false; + + snprintf(value, sizeof(value), "%d", lane_count); + if (!force_connector_lane_count(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; +} + +static bool force_connector_link_rate(int drm_fd, + drmModeConnector *connector, + const char *value) +{ + return connector_attr_set_debugfs(drm_fd, connector, + "i915_dp_force_link_rate", + value, "auto"); +} + +/** + * kmstest_force_connector_link_rate: + * @fd: drm file descriptor + * @connector: connector + * @link_rate: link rate + * + * Force link rate on the specified connector + * and install exit handler for resetting + * + * Returns: True on success + */ +bool kmstest_force_connector_link_rate(int drm_fd, drmModeConnector *connector, int link_rate) +{ + char value[8]; + drmModeConnector *temp; + + if (!is_intel_device(drm_fd)) + return false; + + snprintf(value, sizeof(value), "%d", link_rate); + if (!force_connector_link_rate(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 + * @output: Target output + * + * Returns: Link rate set for the output. + */ +enum dp_link_rate igt_get_dp_link_rate_set_for_output(int drm_fd, igt_output_t *output) +{ + char buf[512]; + int dir, res; + int link_rate = DP_LINK_RATE_2000000; + + 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)); + res = igt_debugfs_simple_read(dir, "i915_dp_force_link_rate", buf, sizeof(buf)); + close(dir); + igt_require(res > 0); + + if (strstr(buf, "[auto]")) + igt_assert(sscanf(strstr(buf, "*") - 6, "%d", &link_rate) == 1); + else + igt_assert(sscanf(strstr(buf, "[") + 1, "%d", &link_rate) == 1); + + return link_rate; +} + +/** + * igt_get_dp_lane_count_set_for_output: + * @drm_fd: A drm file descriptor + * @output: Target output + * + * Returns: Lane count set for the output. + */ +enum dp_lane_count igt_get_dp_lane_count_set_for_output(int drm_fd, igt_output_t *output) +{ + char buf[512]; + int dir, res; + int lane_count = DP_LANE_COUNT_4; + + 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)); + res = igt_debugfs_simple_read(dir, "i915_dp_force_lane_count", buf, sizeof(buf)); + close(dir); + igt_require(res > 0); + + if (strstr(buf, "[auto]")) + igt_assert(sscanf(strstr(buf, "*") - 2, "%d", &lane_count) == 1); + else + igt_assert(sscanf(strstr(buf, "[") + 1, "%d", &lane_count) == 1); + + return lane_count; +} diff --git a/lib/igt_kms.h b/lib/igt_kms.h index b44d13bcb..cbec2c1ab 100644 --- a/lib/igt_kms.h +++ b/lib/igt_kms.h @@ -288,6 +288,10 @@ bool kmstest_force_connector(int fd, drmModeConnector *connector, bool kmstest_force_connector_bigjoiner(int drm_fd, drmModeConnector *connector); void kmstest_force_edid(int drm_fd, drmModeConnector *connector, const struct edid *edid); +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_get_connector_default_mode(int drm_fd, drmModeConnector *connector, drmModeModeInfo *mode); @@ -1246,5 +1250,8 @@ bool intel_pipe_output_combo_valid(igt_display_t *display); bool igt_check_output_is_dp_mst(igt_output_t *output); int igt_get_dp_mst_connector_id(igt_output_t *output); int get_num_scalers(int drm_fd, enum pipe pipe); +void read_link_rates(int drm_fd, uint64_t *link_rates, int *num_rates, igt_output_t *output); +enum dp_link_rate igt_get_dp_link_rate_set_for_output(int drm_fd, igt_output_t *output); +enum dp_lane_count igt_get_dp_lane_count_set_for_output(int drm_fd, igt_output_t *output); #endif /* __IGT_KMS_H__ */ -- 2.43.0