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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 62C16C77B70 for ; Mon, 17 Apr 2023 08:48:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230370AbjDQIrz (ORCPT ); Mon, 17 Apr 2023 04:47:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55500 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230003AbjDQIrw (ORCPT ); Mon, 17 Apr 2023 04:47:52 -0400 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0ABE94222; Mon, 17 Apr 2023 01:47:47 -0700 (PDT) Received: from [192.168.88.20] (91-154-35-171.elisa-laajakaista.fi [91.154.35.171]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 59674DE6; Mon, 17 Apr 2023 10:47:37 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1681721259; bh=GktcEwyf2LwQ6NY0LHuBgtJ5WGGHaw1b0hIIRAgA2Q0=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=m5BRM+SgWPTQUonWy/ReGbOSc++sNjonGnQSxO+O5hR6EIqBQhCe01gimQwtYoZZh 0rN3MN9cUahvdHwYGqm6xHBnrQ/hYfBNT/4pbGUK/ghnH9eC3yNem+g8vmnQyZTiXM VFxdGh/55LnNic0Co82X9r+WIDSvHl+VjOm6MxBI= Message-ID: Date: Mon, 17 Apr 2023 11:47:39 +0300 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 Subject: Re: [PATCH v2 0/2] "no-hpd" support in CDNS DP bridge driver Content-Language: en-US To: Jayesh Choudhary , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, krzysztof.kozlowski@linaro.org Cc: andrzej.hajda@intel.com, neil.armstrong@linaro.org, rfoss@kernel.org, Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se, jernej.skrabec@gmail.com, airlied@gmail.com, daniel@ffwll.ch, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, sam@ravnborg.org, jani.nikula@intel.com, tzimmermann@suse.de, javierm@redhat.com, ville.syrjala@linux.intel.com, r-ravikumar@ti.com, lyude@redhat.com, alexander.deucher@amd.com, sjakhade@cadence.com, yamonkar@cadence.com, a-bhatia1@ti.com References: <20230405142440.191939-1-j-choudhary@ti.com> From: Tomi Valkeinen In-Reply-To: <20230405142440.191939-1-j-choudhary@ti.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/04/2023 17:24, Jayesh Choudhary wrote: > In J721s2 EVM, DP0 HPD is not connected to correct HPD pin on SOC > which results in HPD detect as always connnected, so when display > is not connected driver continuously retries to read EDID and DPCD > registers. Where is the DP0 HPD connected to? Nowhere? If it's connected to a pin, can that pin be used as a GPIO? In other words, do we have a HPD, just not with mhdp, or is there just no HPD at all? Tomi