From patchwork Thu Dec 5 14:24:40 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ezequiel Garcia X-Patchwork-Id: 11274861 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0612D14BD for ; Thu, 5 Dec 2019 14:25:27 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 D856F24249 for ; Thu, 5 Dec 2019 14:25:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="CEUBxc5F" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D856F24249 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=collabora.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-rockchip-bounces+patchwork-linux-rockchip=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=f+dtSlZ3bEE+GAuOPfX9sLC+vMc1gFwS6+vXxAFVV58=; b=CEUBxc5Fzxx6se ZxOVbDRIDWiRhdiONecNgtiZRfwzemfbwE29DYFiWjoWM1SAhHX5MmokSeJR6J5M5kKtcVekObDaz 5LlfJiNhqBBqkkdKkNnHSzoeUTWExS2DfTyYnlaCfZphTuVAEa1wd7sbOYKcZKJTPBBPrV5t0iZTt SnFzX4RV+tasZeOIYGd3yMorUy+ZeXuWaD/rgikYiILLeHgpd2hUDSK4Ln0jFwnVdOF4adt2KnGeg ItR0vIS8O2GeBjj66TWeKwVr1JNvlGzhc5oaTbrCObhW5ACgMns/i9vCV4x3eUNeKRNyZV93Z2Ago +P0on14+VPU71FJLRgBg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1ics4K-0003lo-GU; Thu, 05 Dec 2019 14:25:24 +0000 Received: from bhuna.collabora.co.uk ([2a00:1098:0:82:1000:25:2eeb:e3e3]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1ics4H-0003jx-6D for linux-rockchip@lists.infradead.org; Thu, 05 Dec 2019 14:25:22 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: ezequiel) with ESMTPSA id B8D84292248 From: Ezequiel Garcia To: linux-media@vger.kernel.org Subject: [PATCH v4 1/4] media: vidioc-enum-fmt.rst: clarify format preference Date: Thu, 5 Dec 2019 11:24:40 -0300 Message-Id: <20191205142443.1298-2-ezequiel@collabora.com> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20191205142443.1298-1-ezequiel@collabora.com> References: <20191205142443.1298-1-ezequiel@collabora.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191205_062521_358652_C89C8A29 X-CRM114-Status: UNSURE ( 7.01 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -0.0 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-0.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record -0.0 SPF_HELO_PASS SPF: HELO matches SPF record 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Heiko Stuebner , Jonas Karlman , linux-kernel@vger.kernel.org, Tomasz Figa , linux-rockchip@lists.infradead.org, Boris Brezillon , Philipp Zabel , kernel@collabora.com, Ezequiel Garcia , Chris Healy Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+patchwork-linux-rockchip=patchwork.kernel.org@lists.infradead.org It has been decided to use the ENUM_FMT index value as a hint for driver preference. This is defined purposedly in a very liberal way, letting drivers define what "preference" means. For instance, the Hantro VPU driver indicates additional processing to output a given format, and thus implicates more CPU usage, which is enumerated after native (non-processed) formats. Signed-off-by: Ezequiel Garcia Reviewed-by: Boris Brezillon --- Documentation/media/uapi/v4l/vidioc-enum-fmt.rst | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst b/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst index 399ef1062bac..8ca6ab701e4a 100644 --- a/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst +++ b/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst @@ -44,7 +44,9 @@ To enumerate image formats applications initialize the ``type`` and the :ref:`VIDIOC_ENUM_FMT` ioctl with a pointer to this structure. Drivers fill the rest of the structure or return an ``EINVAL`` error code. All formats are enumerable by beginning at index zero and incrementing by -one until ``EINVAL`` is returned. +one until ``EINVAL`` is returned. If applicable, drivers shall return +formats in preference order, where preferred formats are returned before +(that is, with lower ``index`` value) less-preferred formats. .. note::