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 9BD5DCFD346 for ; Mon, 24 Nov 2025 18:28:37 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 5466C10E2C3; Mon, 24 Nov 2025 18:28:37 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="nJdQ/6Mj"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.14]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4B87210E320 for ; Mon, 24 Nov 2025 18:28:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1764008915; x=1795544915; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=QzAf1PbFEQeX5e8isT51FkQUiwrhLML+R4DMQXSjzNo=; b=nJdQ/6MjjBoFaVT7v5haJFZAUePdAU3N/Qj/LcCm8IJCPony3XK/MyYc 6JBclINwpAXT0HmisxHe5ZpwkDW1TwcojzHFYjcejnW3LB9olaPGG/gxx oqa0bi+runy36QjKPz50UKO3JPOR0jgMBV10J2ARfRCl2Wv9YEd64pKrP uKxYBHMQ1sYjUQIm9JvkgT8YTu5f+5ukAjvUwjf9rRcJea8aWgNQwtqVI 1Ez6XVisa5s8Q9nwPzATXkdG3njOQ0GM1wGoQqvw3btc4mhst72p+nMdD 5ikRJCj5HsaFR9dlKzQKJ0r4/ph8vuQuKLMrdbdn6WtIYaJrmyvEKqE5c g==; X-CSE-ConnectionGUID: qVLWmkhvR16nklyGdcq2ug== X-CSE-MsgGUID: Yzt3SjKiR/GNQYVvkbgnHg== X-IronPort-AV: E=McAfee;i="6800,10657,11623"; a="66055396" X-IronPort-AV: E=Sophos;i="6.20,223,1758610800"; d="scan'208";a="66055396" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by fmvoesa108.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Nov 2025 10:28:35 -0800 X-CSE-ConnectionGUID: nX21+6CmQDiiFRNSFtGpdw== X-CSE-MsgGUID: wa1O8zTUSzeaTRy8GVgGIw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.20,223,1758610800"; d="scan'208";a="215747212" Received: from jeevan-x299-aorus-gaming-3-pro.iind.intel.com ([10.227.90.91]) by fmviesa002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Nov 2025 10:28:35 -0800 From: Jeevan B To: igt-dev@lists.freedesktop.org Cc: kunal1.joshi@intel.com, suraj.kandpal@intel.com, Jeevan B Subject: [PATCH i-g-t 5/6] lib/igt_kms: Add helper to get eDP/DP supported link rates Date: Mon, 24 Nov 2025 23:57:55 +0530 Message-ID: <20251124182804.2095722-6-jeevan.b@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251124182804.2095722-1-jeevan.b@intel.com> References: <20251124182804.2095722-1-jeevan.b@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 igt_get_supported_link_rates to parse debugfs and return available eDP/DP link rates for a given connector. Signed-off-by: Jeevan B --- lib/igt_kms.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++++++ lib/igt_kms.h | 2 ++ 2 files changed, 54 insertions(+) diff --git a/lib/igt_kms.c b/lib/igt_kms.c index c03cfed09..4071aa00a 100644 --- a/lib/igt_kms.c +++ b/lib/igt_kms.c @@ -7632,3 +7632,55 @@ bool igt_has_lobf_debugfs(int drmfd, igt_output_t *output) buf, sizeof(buf)); return res == 0; } + +/** + * igt_get_supported_link_rates: + * @drmfd: A drm file descriptor + * @connector_name: Name of the libdrm connector we're going to use + * + * Returns: All the link rates supported by the connector + */ +int igt_get_supported_link_rates(int drmfd, char *connector_name, + int *rates, int max_rates) +{ + char buf[48]; + int fd, res; + int count = 0; + char *token, *star; + + if (!rates || max_rates <= 0) { + return -1; + } + + fd = igt_debugfs_connector_dir(drmfd, connector_name, O_RDONLY); + igt_assert_lte(0, fd); + + res = igt_debugfs_simple_read(fd, "i915_dp_force_link_rate", buf, sizeof(buf)); + igt_require(res > 0); + + igt_require_f(res > 0, + "Unable to read i915_dp_force_link_rate for %s\n", + connector_name); + + buf[res] = '\0'; /* Null terminate */ + token = strtok(buf, " \t\n"); + + while (token && count < max_rates) { + if (!strcmp(token, "[auto]")) { + token = strtok(NULL, " \t\n"); + continue; + } + + star = strchr(token, '*'); + if (star) + *star = '\0'; + + if (isdigit(token[0])) { + rates[count++] = atoi(token); + } + + token = strtok(NULL, " \t\n"); + } + + return count; +} diff --git a/lib/igt_kms.h b/lib/igt_kms.h index cd9f6840a..474a809ea 100644 --- a/lib/igt_kms.h +++ b/lib/igt_kms.h @@ -1303,6 +1303,8 @@ void igt_set_link_params(int drm_fd, igt_output_t *output, int igt_backlight_read(int *result, const char *fname, igt_backlight_context_t *context); int igt_backlight_write(int value, const char *fname, igt_backlight_context_t *context); uint32_t igt_get_connected_output_count(igt_display_t *display); +int igt_get_supported_link_rates(int drmfd, char *connector_name, int *rates, + int max_rates); drmModePropertyBlobRes *igt_get_writeback_formats_blob(igt_output_t *output); -- 2.43.0