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d="scan'208";a="59321719" 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 14:35:47 -0700 From: Kunal Joshi To: igt-dev@lists.freedesktop.org Cc: imre.deak@intel.com, Kunal Joshi Subject: [PATCH i-g-t 03/10] lib/igt_kms: add function to get max link rate/lane count Date: Wed, 31 Jul 2024 02:43:34 +0530 Message-ID: <20240730211343.58703-4-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 get max link rate/lane count for a particular connector. add functions to retrieve data via newly exposed interface [1] https://patchwork.freedesktop.org/patch/594763/?series=133624&rev=3 Signed-off-by: Kunal Joshi --- lib/igt_kms.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++ lib/igt_kms.h | 2 ++ 2 files changed, 58 insertions(+) diff --git a/lib/igt_kms.c b/lib/igt_kms.c index a21ab0bc8..6d2144483 100644 --- a/lib/igt_kms.c +++ b/lib/igt_kms.c @@ -6838,3 +6838,59 @@ enum dp_lane_count igt_get_dp_lane_count_set_for_output(int drm_fd, igt_output_t return lane_count; } + +/** + * igt_get_dp_max_link_rate: + * @drm_fd: A drm file descriptor + * + * Get the max link rate supported by sink. + * + * Returns: Max link rate supported by sink. + */ +enum dp_link_rate igt_get_dp_max_link_rate(int drm_fd, igt_output_t *output) +{ + char buf[512]; + int dir, res; + int max_link_rate = DP_LINK_RATE_2000000; + + 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_max_link_rate", + buf, sizeof(buf)); + close(dir); + igt_require_f(res > 0, "Couldn't read i915_dp_max_link_rate"); + + igt_assert(sscanf(buf, "%d", &max_link_rate) == 1); + + return max_link_rate; +} + +/** + * igt_get_dp_max_lane_count: + * @drm_fd: A drm file descriptor + * + * Get the max lane count supported by sink. + * + * Returns: Max lane count supported by sink. + */ +enum dp_lane_count igt_get_dp_max_lane_count(int drm_fd, igt_output_t *output) +{ + char buf[512]; + int dir, res; + int max_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_max_lane_count", + buf, sizeof(buf)); + close(dir); + igt_require(res > 0); + + igt_assert(sscanf(buf, "%d", &max_lane_count) == 1); + + return max_lane_count; +} diff --git a/lib/igt_kms.h b/lib/igt_kms.h index cbec2c1ab..4ffe03bfc 100644 --- a/lib/igt_kms.h +++ b/lib/igt_kms.h @@ -1253,5 +1253,7 @@ 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); +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); #endif /* __IGT_KMS_H__ */ -- 2.43.0