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 4DB83FF8867 for ; Wed, 29 Apr 2026 10:00:20 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id EE9C310EF27; Wed, 29 Apr 2026 10:00:19 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="FBniWLkI"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.12]) by gabe.freedesktop.org (Postfix) with ESMTPS id 2748B10EF27 for ; Wed, 29 Apr 2026 10:00:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1777456804; x=1808992804; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=N+JGv7O/jjDseJ8SC8yUihLKj+eS9PVscAeuqVP6Ds4=; b=FBniWLkIxV9kaBWiONPfxmh2l+XUGEv15zMldfOKRhZSgNzJIDmjWOiN QBaveILsQFHaoBkL524mIokAzu/UgkVGIb+VKbgC7HIxGqtclAo4kXP1Y SDDObbPyvPs6+J9wBFtYifH3tJJVBsBHHqpCQbHWi723B3iEKiwiCRWOB 44nY/gRe1zC17S2qxdWaFPB+8IiF5sGCfRySnosIgJRH+U3x2DvCD8Iaz eWiQ+QmjFviYdswXv66bs7ljQYeumIDXZ//i663PwybzlAAXVvjutA3qy nIBDVyHE5uP62c8IwclzhR+RyOFUNp+fcOZLmSw//NN6pTIBuOGRkg2WX w==; X-CSE-ConnectionGUID: CnfI/tfHQOmqynWMmhlMjQ== X-CSE-MsgGUID: wNkapcgFRnOYLNtd6drGSQ== X-IronPort-AV: E=McAfee;i="6800,10657,11770"; a="82237141" X-IronPort-AV: E=Sophos;i="6.23,205,1770624000"; d="scan'208";a="82237141" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by fmvoesa106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Apr 2026 03:00:03 -0700 X-CSE-ConnectionGUID: iUgtPnI2Sgmk3D3W1hyQDw== X-CSE-MsgGUID: stcMgpPtSTG4CqNQtLGj4A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,205,1770624000"; d="scan'208";a="231572336" Received: from sowmi-x299-aorus-gaming-3-pro.iind.intel.com ([10.223.74.56]) by fmviesa008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Apr 2026 03:00:02 -0700 From: Sowmiya S To: igt-dev@lists.freedesktop.org Cc: swati2.sharma@intel.com, kunal1.joshi@intel.com, Sowmiya S Subject: [PATCH i-g-t v2 0/2] Fix 2-display test for MST shared-link BW Date: Wed, 29 Apr 2026 15:51:23 +0530 Message-ID: <20260429102125.2313449-1-sowmiya.s@intel.com> X-Mailer: git-send-email 2.43.0 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" On MST hubs / daisy-chain setups two display streams share one DP link; a joint atomic commit can be rejected by the driver if the combined mode bandwidth exceeds the link capacity. The driver therefore adjusts per-pipe settings (for example reducing pipe bpp and enabling dithering) when both streams are committed together, so tests must pick a mode combination the driver will accept. Sowmiya S (2): lib/igt_kms: Add MST bandwidth-fitting support and helpers tests/kms_plane_multiple: Fix 2-display test for MST shared-link BW lib/igt_kms.c | 37 +++++++++++++++++ lib/igt_kms.h | 2 + tests/kms_plane_multiple.c | 85 +++++++++++++++++++++++++++++++------- 3 files changed, 110 insertions(+), 14 deletions(-) -- 2.48.1