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 A27E4C4828F for ; Thu, 8 Feb 2024 15:45:57 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0EE5E10E915; Thu, 8 Feb 2024 15:45:57 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="MVZt/wN0"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.10]) by gabe.freedesktop.org (Postfix) with ESMTPS id EAC8410E915 for ; Thu, 8 Feb 2024 15:45:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1707407156; x=1738943156; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=A9yaxMwUDVUVXXKhGKwpMz7HeXYkp/aria/DOFQHeyI=; b=MVZt/wN0VDyQUE5WJLXg0NKRtEAe1BmjGPOJFHHkBJaSt1mJeVL4k1+C O+gS5JVVTFmCf67GRhERY73B36RDRWFzJCihdkScnLkHLmJqV7VMudevu DfBc1TG+8gNzSPXtc/ldshKa8Ep+2AlnJzg+Go7x+jzEoKowd2CFBTt+L hx7m71YVlouwk6goWpBmHEINlMwbX9820Xp6f4vFWnU/2nobdoyRuI0Hv fipdik418nydBrkhr8mMTXZD4qpVGILhcnUqDB6gBGChGPyiolv4Mmbx+ jXwQE8ax05sogxXUi43Lw9T18FshWGKlScvXddfuvccVlT5OrkU8zsXRZ w==; X-IronPort-AV: E=McAfee;i="6600,9927,10978"; a="18663157" X-IronPort-AV: E=Sophos;i="6.05,254,1701158400"; d="scan'208";a="18663157" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orvoesa102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Feb 2024 07:45:56 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10978"; a="824867150" X-IronPort-AV: E=Sophos;i="6.05,254,1701158400"; d="scan'208";a="824867150" Received: from stinkpipe.fi.intel.com (HELO stinkbox) ([10.237.72.74]) by orsmga001.jf.intel.com with SMTP; 08 Feb 2024 07:45:53 -0800 Received: by stinkbox (sSMTP sendmail emulation); Thu, 08 Feb 2024 17:45:52 +0200 From: Ville Syrjala To: intel-gfx@lists.freedesktop.org Cc: stable@vger.kernel.org Subject: [PATCH] drm/i915/dp: Limit SST link rate to <=8.1Gbps Date: Thu, 8 Feb 2024 17:45:52 +0200 Message-ID: <20240208154552.14545-1-ville.syrjala@linux.intel.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Ville Syrjälä Limit the link rate to HBR3 or below (<=8.1Gbps) in SST mode. UHBR (10Gbps+) link rates require 128b/132b channel encoding which we have not yet hooked up into the SST/no-sideband codepaths. Cc: stable@vger.kernel.org Signed-off-by: Ville Syrjälä --- drivers/gpu/drm/i915/display/intel_dp.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index ab415f41924d..5045c34a16be 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -2356,6 +2356,9 @@ intel_dp_compute_config_limits(struct intel_dp *intel_dp, limits->min_rate = intel_dp_common_rate(intel_dp, 0); limits->max_rate = intel_dp_max_link_rate(intel_dp); + /* FIXME 128b/132b SST support missing */ + limits->max_rate = min(limits->max_rate, 810000); + limits->min_lane_count = 1; limits->max_lane_count = intel_dp_max_lane_count(intel_dp); -- 2.43.0