From patchwork Mon May 23 07:24:12 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans Verkuil X-Patchwork-Id: 575883 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 99BDAC433FE for ; Mon, 23 May 2022 07:28:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231185AbiEWH1w (ORCPT ); Mon, 23 May 2022 03:27:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51316 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231206AbiEWH1M (ORCPT ); Mon, 23 May 2022 03:27:12 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1A982193C8 for ; Mon, 23 May 2022 00:24:16 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id A55C960F4E for ; Mon, 23 May 2022 07:24:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 94C05C385AA; Mon, 23 May 2022 07:24:14 +0000 (UTC) Message-ID: <4558ae65-b5af-5cc3-9159-c2d134441226@xs4all.nl> Date: Mon, 23 May 2022 09:24:12 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.8.1 Subject: [PATCH 3/2] media: vivid.rst: document HDMI Video Guard Band control Content-Language: en-US To: linux-media@vger.kernel.org Cc: Johan Fjeldtvedt References: <20220513125307.3494442-1-hverkuil-cisco@xs4all.nl> <20220513125307.3494442-3-hverkuil-cisco@xs4all.nl> From: Hans Verkuil In-Reply-To: <20220513125307.3494442-3-hverkuil-cisco@xs4all.nl> Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Document this new vivid test control. Signed-off-by: Hans Verkuil diff --git a/Documentation/admin-guide/media/vivid.rst b/Documentation/admin-guide/media/vivid.rst index 6d7175f96f74..41b2f668134e 100644 --- a/Documentation/admin-guide/media/vivid.rst +++ b/Documentation/admin-guide/media/vivid.rst @@ -714,6 +714,20 @@ The Test Pattern Controls are all specific to video capture. does the same for the EAV (End of Active Video) code. +- Insert Video Guard Band + + adds 4 columns of pixels with the HDMI Video Guard Band code at the + left hand side of the image. This only works with 3 or 4 byte RGB pixel + formats. The RGB pixel value 0xab/0x55/0xab turns out to be equivalent + to the HDMI Video Guard Band code that precedes each active video line + (see section 5.2.2.1 in the HDMI 1.3 Specification). To test if a video + receiver has correct HDMI Video Guard Band processing, enable this + control and then move the image to the left hand side of the screen. + That will result in video lines that start with multiple pixels that + have the same value as the Video Guard Band that precedes them. + Receivers that will just keep skipping Video Guard Band values will + now fail and either loose sync or these video lines will shift. + Capture Feature Selection Controls ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^