From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 269D6471247 for ; Wed, 9 Sep 2026 12:16:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788956183; cv=none; b=fBe9hfBQQIbHUo3VctrFWbB5eH2UAKkUZL7bPPcJX2jGGsFD5Y9Ku9qeP/fkpexRm262NiS6e31VirXU+6u+SIKs8ULDpjv5uueGDW3PXopKsD695K27dDF66Ugby6kT1wW4N4x7tFegyrZ/uFMWmemQStGeTNJsgH4UfoHl0Lo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788956183; c=relaxed/simple; bh=y0AFMcKTGl7uv/p5BHEJJeildm+pyxOLf4CVF643gno=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=ler0BZQCan0fLvQuyNEE3yXwK+EAQE2rhX+6imxFss8f7Zjai+GOiW06nIBIpPifc6tRpQP31y/3w8dNBUHxx0iv3IOOEtkBoJ2IZNtfQvBbcbK7QvR7gg84R2IYoFtdFvdz99ln57cLEvqzC3rHT7sm1r+ehRxka59tJFQ1/wk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=HIXXv8s6; arc=none smtp.client-ip=198.175.65.18 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="HIXXv8s6" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1788956182; x=1820492182; h=from:to:cc:subject:in-reply-to:references:date: message-id:mime-version; bh=y0AFMcKTGl7uv/p5BHEJJeildm+pyxOLf4CVF643gno=; b=HIXXv8s6lFg6edAxL2m7JzHtC+1XGnegIjXG44jgCgCjWX6O8ywVXuBy g6ZraTQ+BW0yc5Z5JlIDYNZMwKr581ux9eQo+Ee8VYkea5qkS6oXEI9TC /9kP/kHA1Q1bbPaIE1QJAjZ8lxxhwVTtsfu1ZzFzIG0gmuZFEvO7iiYe2 rksw67AJIoVCTRRRlvKqgzClMxCUYLQTMbf1vnI8GWlhhP/54G26iR3e3 Gx5ApwHF/qnzGv0fU1GhHl6PbrdNEaomZo/KJJJovuqoR1TxEEOaXetey KRd4RrXpUnAZ4KUO8zzFmyzsE5l5txIO3aE/cJ9DwAr6aIfGcmQEijjOM Q==; X-CSE-ConnectionGUID: 96qSxNyNS0m7dOM+U+k1jA== X-CSE-MsgGUID: d09oW9V+S0epapUflzxGMQ== X-IronPort-AV: E=McAfee;i="6800,10657,11900"; a="89420156" X-IronPort-AV: E=Sophos;i="6.25,270,1779174000"; d="scan'208";a="89420156" Received: from fmviesa009.fm.intel.com ([10.60.135.149]) by orvoesa110.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Sep 2026 05:16:22 -0700 X-CSE-ConnectionGUID: SqBcx/zaToSD5AD4+2lWdg== X-CSE-MsgGUID: jP4tqTR2Rpy3s7bt60Pj9A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,270,1779174000"; d="scan'208";a="265090508" Received: from fpallare-mobl4.ger.corp.intel.com (HELO localhost) ([10.245.245.20]) by fmviesa009-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Sep 2026 05:16:18 -0700 From: Jani Nikula To: tarund18303@gmail.com Cc: rodrigo.vivi@intel.com, joonas.lahtinen@linux.intel.com, tursulin@ursulin.net, airlied@gmail.com, simona@ffwll.ch, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, tarun-tarun143 Subject: Re: [PATCH] drm/i915/dp_link_caps: Validate max link rate In-Reply-To: <20260827022035.3442-1-tarund18303@gmail.com> Organization: Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs Bertel Jungin Aukio 5, 02600 Espoo, Finland References: <20260827022035.3442-1-tarund18303@gmail.com> Date: Wed, 09 Sep 2026 15:16:16 +0300 Message-ID: <0531dd3f6e5056128dc1208c31199373a9035175@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain On Thu, 27 Aug 2026, tarund18303@gmail.com wrote: > From: tarun-tarun143 > > Validate the maximum link rate against the source-supported rates > before using the maximum link limits to calculate allowed > configurations. > > This prevents an unsupported link rate from being accepted as a > maximum link limit. Are you seeing this issue being hit, or are you just going through TODO comments and trying to come up with fixes? BR, Jani. > > Signed-off-by: tarun-tarun143 > --- > drivers/gpu/drm/i915/display/intel_dp_link_caps.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_caps.c b/drivers/gpu/drm/i915/display/intel_dp_link_caps.c > index 7b6cc6055da8..0934488153bb 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp_link_caps.c > +++ b/drivers/gpu/drm/i915/display/intel_dp_link_caps.c > @@ -710,7 +710,10 @@ static bool max_link_limits_valid(struct intel_dp_link_caps *link_caps, > !is_power_of_2(max_link_limits->lane_count)) > return false; > > - /* TODO: Validate max_link_limits->rate against the source supported rates. */ > + if (intel_dp_rate_index(link_caps->dp->source_rates, > + link_caps->dp->num_source_rates, > + max_link_limits->rate) < 0) > + return false; > > intel_dp_link_caps_get_forced_params(link_caps, &forced_params); > allowed_configs = calc_allowed_config_filter(link_caps, link_caps->enabled_configs, > > base-commit: 73e3f0710014fe6d4ed98cfc02292f6121db7558 -- Jani Nikula, Intel