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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 7A33ACA1009 for ; Wed, 3 Sep 2025 11:26:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=tyU9YHSHeoRBlfEKzft75QDLwmm4JgRvAF2dZVDQfv8=; b=Cdls+i6amGSjB5GQbZDN3Y+Ob9 GjeJrLBbhUDonTsPO0TWdEqifXuyzIm00O2/GybBuho2q4sOFv153m6A5scKnEioL3QBkkD97bovM 9f5hDPThAVg7vYQuma7gynhPEzY32Tw/CB1LP1NnSNTXAy8g4F2YcFNYUt9/mm/7LoRq9qEhmnAIi 6cbOvBr2StQB0SFt0h1Wbqn/Aa/I+4SR4VGd+z1yZZwQXtwZSZb5YqDsRCRKZzlRcYu4Gt1idljdG 9uE+RRK/uBPl9uphpKBqlkvNpa7XzK2iTWo3omLLX0QVguqMPeXhE1zFAIOEwxrQLRbOPaGfMOV7S u7HVRDmQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1utlcv-00000006Dzx-3xG5; Wed, 03 Sep 2025 11:26:09 +0000 Received: from perceval.ideasonboard.com ([213.167.242.64]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1utke4-000000065SK-2W9W for linux-arm-kernel@lists.infradead.org; Wed, 03 Sep 2025 10:23:17 +0000 Received: from isaac-ThinkPad-T16-Gen-2.lan (cpc89244-aztw30-2-0-cust6594.18-1.cable.virginm.net [86.31.185.195]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 4A6CBC6D; Wed, 3 Sep 2025 12:22:05 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1756894926; bh=m7VoVORCRPmE9sJDD1t63RnEi0k7Sc7WqvjsbxvaBpg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aTqTeDd2KK/HXBeiT9CweKPF0VShHez7ziwt5AHJpFXKXX/Xcgha5IP7J6HaQ9Cd7 +gnK4FOmCbGTrk8By0o6cwMY6gd3MB2A4+qlm4JjT5EqnaAnSeovwEhnDkplr1jcbI Vxhp7/HC7UwJe0mM1KzLtTk+qPZoequlPF7NdTHU= From: Isaac Scott To: laurent.pinchart@ideasonboard.com Cc: rmfrfs@gmail.com, martink@posteo.de, kernel@puri.sm, mchehab@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, linux-media@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, hverkuil@kernel.org, nicolas.dufresne@collabora.com, sakari.ailus@linux.intel.com, tomi.valkeinen@ideasonboard.com, jonas@kwiboo.se, dan.scally+renesas@ideasonboard.com, m.szyprowski@samsung.com, mehdi.djait@linux.intel.com, niklas.soderlund+renesas@ragnatech.se, Isaac Scott Subject: [PATCH v2 1/3] media: v4l: Add helper to get number of active lanes via a pad Date: Wed, 3 Sep 2025 11:22:40 +0100 Message-ID: <20250903102243.1563527-2-isaac.scott@ideasonboard.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250903102243.1563527-1-isaac.scott@ideasonboard.com> References: <20250903102243.1563527-1-isaac.scott@ideasonboard.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250903_032316_780301_98D2E193 X-CRM114-Status: GOOD ( 14.76 ) X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Sometimes, users will not use all of the MIPI CSI 2 lanes available when connecting to the MIPI CSI receiver of their device. Add a helper function that checks the mbus_config for the device driver to allow users to define the number of active data lanes through the get_mbus_config op. If the driver does not implement this op, fall back to using the number of data lanes specified in device tree. Signed-off-by: Isaac Scott --- drivers/media/v4l2-core/v4l2-common.c | 25 +++++++++++++++++++++++++ include/media/v4l2-common.h | 1 + 2 files changed, 26 insertions(+) diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c index 6e585bc76367..8683107b3704 100644 --- a/drivers/media/v4l2-core/v4l2-common.c +++ b/drivers/media/v4l2-core/v4l2-common.c @@ -571,6 +571,31 @@ s64 __v4l2_get_link_freq_pad(struct media_pad *pad, unsigned int mul, return __v4l2_get_link_freq_ctrl(sd->ctrl_handler, mul, div); } EXPORT_SYMBOL_GPL(__v4l2_get_link_freq_pad); + +unsigned int v4l2_get_active_data_lanes(const struct media_pad *pad, unsigned int dt_lanes) +{ + struct v4l2_mbus_config mbus_config = {}; + struct v4l2_subdev *sd; + unsigned int lanes; + int ret; + + sd = media_entity_to_v4l2_subdev(pad->entity); + ret = v4l2_subdev_call(sd, pad, get_mbus_config, pad->index, + &mbus_config); + if (ret < 0 && ret != -ENOIOCTLCMD) + return ret; + + if (!mbus_config.bus.mipi_csi2.num_data_lanes) + return dt_lanes; + + lanes = mbus_config.bus.mipi_csi2.num_data_lanes; + + if (lanes < 0 || lanes > dt_lanes) + return -EINVAL; + + return lanes; +} +EXPORT_SYMBOL_GPL(v4l2_get_active_data_lanes); #endif /* CONFIG_MEDIA_CONTROLLER */ /* diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h index 0a43f56578bc..3f8937260c76 100644 --- a/include/media/v4l2-common.h +++ b/include/media/v4l2-common.h @@ -584,6 +584,7 @@ int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt, u32 pixelformat, (pad, mul, div) s64 __v4l2_get_link_freq_pad(struct media_pad *pad, unsigned int mul, unsigned int div); +unsigned int v4l2_get_active_data_lanes(const struct media_pad *pad, unsigned int dt_lanes); #else #define v4l2_get_link_freq(handler, mul, div) \ __v4l2_get_link_freq_ctrl(handler, mul, div) -- 2.43.0