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 DE79CC5DF6D for ; Wed, 19 Aug 2026 05:26:46 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8703710E0B9; Wed, 19 Aug 2026 05:26:46 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="JGcu8U/o"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.10]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4804110E0B9 for ; Wed, 19 Aug 2026 05:25:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1787117135; x=1818653135; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=x+tc5DprKEVSJGefOd7U7K0MIMs40S/q7OyBg36C5K0=; b=JGcu8U/oWxujM8zPAyRIw0K5OfjQomEBklaPQYo78y4QuZJJ5tU0Wln7 Eo5I7oCbgcQ7RVKOxRzz6fAvOC1R7IT69BFGney1jhn5SYOnmzcrJo9po K9DVUfHtPbxQQbC68RWLMZyK5jUVVI8GLLmZpntN0FY4iKHFQp44SpNK/ mMJoQxpWwtRAtFIxuHT9VKwI/8XoxrdnBiQAqYljzKGiBrvYpMrpHVgvB Rxfuf2S0HNifFhknVrDg1IXSdJEkoLoiZn5eylNRzeAQvxPLSdUpaGZfa ja7sQ1Iy/le6kPJE7TQyNyxioykVZ573ck96SO0Etbfo04IA3qdT5gQCq Q==; X-CSE-ConnectionGUID: yPe+l7l/QCStFX+NGCwcfQ== X-CSE-MsgGUID: tmJUg6JWQIynUDAlvecHVw== X-IronPort-AV: E=McAfee;i="6800,10657,11879"; a="98979689" X-IronPort-AV: E=Sophos;i="6.25,231,1779174000"; d="scan'208";a="98979689" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by fmvoesa104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Aug 2026 22:25:35 -0700 X-CSE-ConnectionGUID: 7PdR6rSDSrScDwdYHm6AyQ== X-CSE-MsgGUID: uFpS/U08T7GVR+TlvOodOA== X-ExtLoop1: 1 Received: from rbalaar-mobl1.gar.corp.intel.com (HELO [10.247.151.71]) ([10.247.151.71]) by fmviesa003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Aug 2026 22:25:33 -0700 Message-ID: <9b944fa5-e3d4-4b58-959d-e1f8e53b4f13@intel.com> Date: Wed, 19 Aug 2026 10:55:30 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH i-g-t v5 3/4] tests/intel/kms_dp_linktrain_fallback: Add UHBR-to-HBR fallback subtest To: Sowmiya S , igt-dev@lists.freedesktop.org Cc: karthik.b.s@intel.com References: <20260817082612.1101382-1-sowmiya.s@intel.com> <20260817082612.1101382-4-sowmiya.s@intel.com> Content-Language: en-US From: "Joshi, Kunal1" In-Reply-To: <20260817082612.1101382-4-sowmiya.s@intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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" On 17-08-2026 13:56, Sowmiya S wrote: > Add 'uhbr-to-hbr-fallback' to verify the 128b/132b->8b/10b encoding > transition on UHBR-capable DP connectors by pinning the link at the > highest sustainable UHBR rate, forcing LT_FAILURE_REDUCED_CAPS failures > and asserting the rate drops below UHBR10. Supports SST and MST. > > v2: resets MST traversal state per test run (Kunal) > v3: - use i915_dp_is_uhbr_rate()/i915_dp_get_next_lower_rate() > from lib > - single UHBR capability gate using max_link_rate after reset > - add igt_reset_connectors() on pin-loop early-return > - hard-assert for 'fallback not reached' > - remove dead run_dsc reset; merge run_* funcs > - fix link rate log units (10 kbit/s). > - Extend run_lt_fallback_test() with a force_uhbr parameter > - and remove the duplicate run_uhbr_to_hbr_fallback_test() > (Kunal) > > Signed-off-by: Sowmiya S Fold patch 4 here with that Reviewed-by: Kunal Joshi