From patchwork Wed May 5 17:23:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Werner Sembach X-Patchwork-Id: 12240669 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6AECBC433ED for ; Wed, 5 May 2021 17:24:12 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 12261608FE for ; Wed, 5 May 2021 17:24:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 12261608FE Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=tuxedocomputers.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9E3676EC2A; Wed, 5 May 2021 17:24:09 +0000 (UTC) Received: from srv6.fidu.org (srv6.fidu.org [159.69.62.71]) by gabe.freedesktop.org (Postfix) with ESMTPS id E25EB6EC27; Wed, 5 May 2021 17:24:07 +0000 (UTC) Received: from localhost (localhost.localdomain [127.0.0.1]) by srv6.fidu.org (Postfix) with ESMTP id 9D425C800B3; Wed, 5 May 2021 19:24:06 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at srv6.fidu.org Received: from srv6.fidu.org ([127.0.0.1]) by localhost (srv6.fidu.org [127.0.0.1]) (amavisd-new, port 10026) with LMTP id DYNzcYye3W-t; Wed, 5 May 2021 19:24:06 +0200 (CEST) Received: from wsembach-tuxedo.fritz.box (p200300E37f39860005A4018A54f094b9.dip0.t-ipconnect.de [IPv6:2003:e3:7f39:8600:5a4:18a:54f0:94b9]) (Authenticated sender: wse@tuxedocomputers.com) by srv6.fidu.org (Postfix) with ESMTPA id 574F6C800A8; Wed, 5 May 2021 19:24:06 +0200 (CEST) From: Werner Sembach To: wse@tuxedocomputers.com, ville.syrjala@linux.intel.com, airlied@linux.ie, daniel@ffwll.ch, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH 0/3] drm/i915/display Try YCbCr420 color when RGB fails Date: Wed, 5 May 2021 19:23:58 +0200 Message-Id: <20210505172401.1453178-1-wse@tuxedocomputers.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" When encoder validation of a display mode fails, retry with less bandwidth heavy YCbCr420 color mode, if available. This enables some HDMI 1.4 setups to support 4k60Hz output, which previously failed silently. AMDGPU had nearly the exact same issue. This problem description is therefore copied from my commit message of the AMDGPU patch. On some setups, while the monitor and the gpu support display modes with pixel clocks of up to 600MHz, the link encoder might not. This prevents YCbCr444 and RGB encoding for 4k60Hz, but YCbCr420 encoding might still be possible. However, which color mode is used is decided before the link encoder capabilities are checked. This patch fixes the problem by retrying to find a display mode with YCbCr420 enforced and using it, if it is valid. This patchset is revision 5. Only change to 4 is a small whitespace error fix.