From patchwork Wed Jul 7 07:34:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eizan Miyamoto X-Patchwork-Id: 12361975 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=-18.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 1EB2AC07E95 for ; Wed, 7 Jul 2021 07:37:39 +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 E59A461CAA for ; Wed, 7 Jul 2021 07:37:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E59A461CAA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Dh4NqLiHgM4ZRsclS5B3EYpIn9fPtKGY+iTnnRb7UIU=; b=Mlxh4s4sY0MZ5z E+SCZkrcDeNc5ZWW8NI66ChjdrPy8PHIrfOJMKMd0vtTr2YoecZvtWR5/gE6w5QXwiP8nY4UJl1+e 04wYFtcFGXHZ5wf8cUg+Wqf2GuWCO/EbSgvhutVo9n4BAOX2PK9rdM6iue3VP6EZy/HtJaAZykzSG YX2S8N8riiZnvEBxIm7cK08WKEyVhoPWNPDAtlzKtE8zXjlqsA/RNswIs2nNeMj1lOgRqr1EmhkP8 V47fnl3JGhiQdC/W6Z9/0xK8T+2N3Isv14UJnWpV3JxckLyA8A8wN4QIsbCNE8IhmwgLy9JILQHeL t6GUNNRq4GUS/FlLa3HA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m127a-00DrwI-8f; Wed, 07 Jul 2021 07:37:26 +0000 Received: from mail-pl1-x634.google.com ([2607:f8b0:4864:20::634]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1m125b-00Dqmg-5K for linux-mediatek@lists.infradead.org; Wed, 07 Jul 2021 07:35:26 +0000 Received: by mail-pl1-x634.google.com with SMTP id h1so582573plf.6 for ; Wed, 07 Jul 2021 00:35:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=o+DOXYaLhuexH0DTEP+mN+AuQ2RorTj6+9m3uAihWSo=; b=EcdqyIk2NW70w0Z7UNj55PxSMt/fdYXmWaot0zjGUXjAP+tMifFgMDAfSgvNUXZCUZ 5pS7ykBRJErpdLwUilHQDJlpNf7l9k9LuHZabTtlkmwrCxdyU3YFylwPzlMfmuZJ0mAd rmB0B08++4xpfg98vEmkMCe9PJXo+FaESLaZw= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=o+DOXYaLhuexH0DTEP+mN+AuQ2RorTj6+9m3uAihWSo=; b=kfytNfA6lA1YQdZbjCdYNUQN64gLUuCJIMkBnSf+UVF1oTgDI6lTJju9ZTt9dWtM4d GkPJo8wyuEFjwGEAbBg3QHSq6gK5SoWglUyxI6IKTSQktIRkJsYuOA3tMEmYj396Sg0/ szzHAcbl2aRvlGosr91t6/1byQdwNIbz12nQ9S3BWcjh53bxk5Nc+bYlMkoYT6FwzYAp JmDbcdC8Eq7s2Oec+o8nC0qDD+Vo6/69zOeM/c3MlupTjCCjLLMYW8bc1JVmHDhJIKsz 24DuihvZLovRPkedD/LdGx73qdR5oJibQaThbVT0EqPO4pd9N0bYvHZM1fAYS63ftVro aC9w== X-Gm-Message-State: AOAM532pKgEs5N4xhv/tbb7BcSa8ULuob4lzSYd7IgRG8d8+2aioHHQO 8bDudhyOvt/BXjV3FEMgnThaPw== X-Google-Smtp-Source: ABdhPJzPseLgE/hsVWQam/QaixoVt6a5aaza7/qtRRMngOoyhV2y0dipT8IFkbbtDCrsRuX/YM0jQA== X-Received: by 2002:a17:902:8601:b029:11c:4b4:e967 with SMTP id f1-20020a1709028601b029011c04b4e967mr20390465plo.75.1625643322093; Wed, 07 Jul 2021 00:35:22 -0700 (PDT) Received: from localhost ([2401:fa00:9:14:ccb9:d95f:4dac:dbc4]) by smtp.gmail.com with UTF8SMTPSA id d2sm21506853pgh.59.2021.07.07.00.35.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 07 Jul 2021 00:35:21 -0700 (PDT) From: Eizan Miyamoto To: linux-kernel@vger.kernel.org Cc: houlong.wei@mediatek.com, enric.balletbo@collabora.com, wenst@chromium.org, yong.wu@mediatek.com, chunkuang.hu@kernel.org, Eizan Miyamoto , Andrew-CT Chen , Matthias Brugger , Mauro Carvalho Chehab , Minghsiu Tsai , linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org, linux-mediatek@lists.infradead.org Subject: [PATCH v4 7/8] media: mtk-mdp: use mdp-rdma0 alias to point to MDP master Date: Wed, 7 Jul 2021 17:34:09 +1000 Message-Id: <20210707173108.v4.7.I2049e180dca12e0d1b3178bfc7292dcf9e05ac28@changeid> X-Mailer: git-send-email 2.32.0.93.g670b81a890-goog In-Reply-To: <20210707073410.999625-1-eizan@chromium.org> References: <20210707073410.999625-1-eizan@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210707_003523_250546_A32E27B5 X-CRM114-Status: GOOD ( 27.21 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org ... Instead of depending on the presence of a mediatek,vpu property in the device node. That property was originally added to link to the vpu node so that the mtk_mdp_core driver could pass the right device to vpu_wdt_reg_handler(). However in a previous patch in this series, the driver has been modified to search the device tree for that node instead. That property was also used to indicate the primary MDP device, so that it can be passed to the V4L2 subsystem as well as register it to be used when setting up queues in the open() callback for the filesystem device node that is created. In this case, assuming that the primary MDP device is the one with a specific alias seems useable because the alternative is to add a property to the device tree which doesn't actually represent any facet of hardware (i.e., this being the primary MDP device is a software decision). In other words, this solution is equally as arbitrary, but at least it doesn't add a property to a device node where said property is unrelated to the hardware present. Signed-off-by: Eizan Miyamoto --- (no changes since v1) drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 47 ++++++++++++++----- drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 6 +++ 2 files changed, 42 insertions(+), 11 deletions(-) diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c index 59911ee063c1..2a71c582d8b1 100644 --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c @@ -141,22 +141,48 @@ void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp) } } +/* + * The MDP master device node is identified by the device tree alias + * "mdp-rdma0". + */ +static int is_mdp_master(struct device *dev) +{ + struct device_node *aliases, *mdp_rdma0_node; + const char *mdp_rdma0_path; + + if (!dev->of_node) + return 0; + + aliases = of_find_node_by_path("/aliases"); + if (!aliases) { + dev_err(dev, "no aliases found for mdp-rdma0"); + return 0; + } + + mdp_rdma0_path = of_get_property(aliases, "mdp-rdma0", NULL); + if (!mdp_rdma0_path) { + dev_err(dev, "get mdp-rdma0 property of /aliases failed"); + return 0; + } + + mdp_rdma0_node = of_find_node_by_path(mdp_rdma0_path); + if (!mdp_rdma0_node) { + dev_err(dev, "path resolution failed for %s", mdp_rdma0_path); + return 0; + } + + return dev->of_node == mdp_rdma0_node; +} + static int mtk_mdp_comp_bind(struct device *dev, struct device *master, void *data) { struct mtk_mdp_comp *comp = dev_get_drvdata(dev); struct mtk_mdp_dev *mdp = data; - struct device_node *vpu_node; mtk_mdp_register_component(mdp, comp); - /* - * If this component has a "mediatek-vpu" property, it is responsible for - * notifying the mdp master driver about it so it can be further initialized - * later. - */ - vpu_node = of_parse_phandle(dev->of_node, "mediatek,vpu", 0); - if (vpu_node) { + if (is_mdp_master(dev)) { int ret; ret = v4l2_device_register(dev, &mdp->v4l2_dev); @@ -172,9 +198,8 @@ static int mtk_mdp_comp_bind(struct device *dev, struct device *master, } /* - * presence of the "mediatek,vpu" property in a device node - * indicates that it is the primary MDP rdma device and MDP DMA - * ops should be handled by its DMA callbacks. + * MDP DMA ops will be handled by the DMA callbacks associated with this + * device; */ mdp->rdma_dev = dev; } diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c index 523e3c2798e1..be7d35b3e3ff 100644 --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c @@ -157,6 +157,12 @@ static int mtk_mdp_master_bind(struct device *dev) goto err_component_bind_all; } + if (mdp->rdma_dev == NULL) { + dev_err(dev, "Primary MDP device not found"); + status = -ENODEV; + goto err_component_bind_all; + } + vpu_node = of_find_node_by_name(NULL, "vpu"); if (!vpu_node) { dev_err(dev, "unable to find vpu node");