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 D8910EB64D9 for ; Tue, 27 Jun 2023 08:00:47 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 536C410E29E; Tue, 27 Jun 2023 08:00:47 +0000 (UTC) Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by gabe.freedesktop.org (Postfix) with ESMTPS id D009F10E2A6 for ; Tue, 27 Jun 2023 08:00:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1687852844; x=1719388844; h=from:to:cc:subject:in-reply-to:references:date: message-id:mime-version; bh=uzJgcsTWdTtBSCwZawD3RFuknsHw2UPRdQZEMdVTXBg=; b=G7Jnmj0V207Zmda5OGprBbbbU9TKKSMGkoXJ9xXkanQqYb4FNmB2cLh3 B7b24ghMgeSt4fLRBrysWTqjotiX/DAZ7nNK0dQphokFrWH6KRAJlKoo+ 9/dqlpTRNK3WOfwR7gLrrJGpTkHY9F08VE3+3Gv59bc0fwpQwp/qu3elP 10YrY8zTzV7Nz41eGbCu68iSyCzkBVUuOf/BF7MXMC6963MLFerGAmOL/ JZ/ze06qQUNXAcIRPUTGRpsMJJ42QFz46YqLxy9m6s1ciR3q/z04z87Qw Sp1gV+tdYZe4ExZP4LV6Q/9+OI55UhotyuqsF6kmmFpAuTwI5cgWNF0LX Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10753"; a="427505147" X-IronPort-AV: E=Sophos;i="6.01,161,1684825200"; d="scan'208";a="427505147" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Jun 2023 01:00:43 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10753"; a="716454866" X-IronPort-AV: E=Sophos;i="6.01,161,1684825200"; d="scan'208";a="716454866" Received: from jwerner6-mobl.ger.corp.intel.com (HELO localhost) ([10.252.39.48]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Jun 2023 01:00:42 -0700 From: Jani Nikula To: "Murthy, Arun R" , "intel-gfx@lists.freedesktop.org" In-Reply-To: Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <20230620025243.979317-1-arun.r.murthy@intel.com> <871qi5fb19.fsf@intel.com> <87h6quv1yq.fsf@intel.com> Date: Tue, 27 Jun 2023 11:00:26 +0300 Message-ID: <87ilb9tjvp.fsf@intel.com> MIME-Version: 1.0 Content-Type: text/plain Subject: Re: [Intel-gfx] [PATCH] drm/i915/display/dp: Remove support for UHBR13.5 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" On Tue, 27 Jun 2023, "Murthy, Arun R" wrote: >> -----Original Message----- >> From: Nikula, Jani >> Sent: Monday, June 26, 2023 6:02 PM >> To: Murthy, Arun R ; intel- >> gfx@lists.freedesktop.org >> Cc: Deak, Imre ; Kahola, Mika >> >> Subject: RE: [PATCH] drm/i915/display/dp: Remove support for UHBR13.5 >> >> On Thu, 22 Jun 2023, "Murthy, Arun R" wrote: >> >> -----Original Message----- >> >> From: Nikula, Jani >> >> Sent: Wednesday, June 21, 2023 2:27 PM >> >> To: Murthy, Arun R ; intel- >> >> gfx@lists.freedesktop.org >> >> Cc: Deak, Imre ; Kahola, Mika >> >> ; Murthy, Arun R >> >> Subject: Re: [PATCH] drm/i915/display/dp: Remove support for UHBR13.5 >> >> >> >> On Tue, 20 Jun 2023, Arun R Murthy wrote: >> >> > As per the DP2.1 Spec support for UHBR13.5 is optional. Hence >> >> > removing the support for UHBR13.5 >> >> >> >> That's just not a proper rationale. Please explain. >> >> >> > Programming for UHBR10 and UHBR20 is similar compared to UHBR13.5 As >> > of now we have validated 10Gbps and 20Gbps. The spec also points out >> > when 20Gbps is supported 13.5Gbps is optional so we have not >> validated/implemented the UHBR13.5 Now we have the DP2.1 compatible >> panel is market, expecting users can come up with UHBR13.5 not working. >> Hence removing the support for 13.5Gbps for now. >> > Maybe once we have support for UHBR13.5 in the driver we can enable >> this. >> >> What's missing? >> > Port clock programming, pll values differs. > This table has been in place but some corrections/recheck required. Can we do that instead please? I accidentally stumbled on the relevant gitlab issue [1] (please add this kind of information up front in the future), so we have a reporter that could test the fixes. BR, Jani. [1] https://gitlab.freedesktop.org/drm/intel/-/issues/8686 > > Thanks and Regards, > Arun R Murthy > -------------------- -- Jani Nikula, Intel Open Source Graphics Center