From patchwork Mon Apr 12 11:02:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomi Valkeinen X-Patchwork-Id: 419728 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham 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 93FDEC433B4 for ; Mon, 12 Apr 2021 11:02:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6CA9761074 for ; Mon, 12 Apr 2021 11:02:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239102AbhDLLDN (ORCPT ); Mon, 12 Apr 2021 07:03:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37424 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239948AbhDLLDJ (ORCPT ); Mon, 12 Apr 2021 07:03:09 -0400 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9182CC061574 for ; Mon, 12 Apr 2021 04:02:51 -0700 (PDT) Received: from deskari.lan (91-157-208-71.elisa-laajakaista.fi [91.157.208.71]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 928DF5A9; Mon, 12 Apr 2021 13:02:49 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1618225370; bh=0zJ63dMglysXE5H+l0R8f5EtP4B9aRBT8B09rNV+Okg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FR4KOB5ltHf75OTun4gKw8Cqh+6ZbRxrzg7nlIJ+tt7raMAA6THyFZcbVuEPWnd4X xRRSIszGshlQsPUPIYPip/RotK2Mk8yJh5UABCjDDKvKmk9ixXilq7urQtL95Ounhi VAW0XQkyRCuB16CkpCzbXmche/RaoiIEzIp6+6EI= From: Tomi Valkeinen To: Tomasz Figa , Marek Szyprowski , Mauro Carvalho Chehab , Hans Verkuil , linux-media@vger.kernel.org, Laurent Pinchart Cc: Tomi Valkeinen Subject: [PATCH v2 1/3] media: videobuf2-v4l2.c: add vb2_queue_change_type() helper Date: Mon, 12 Apr 2021 14:02:09 +0300 Message-Id: <20210412110211.275791-2-tomi.valkeinen@ideasonboard.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210412110211.275791-1-tomi.valkeinen@ideasonboard.com> References: <20210412110211.275791-1-tomi.valkeinen@ideasonboard.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org On some platforms a video device can capture either video data or metadata. The driver can implement vidioc functions for both video and metadata, and use a single vb2_queue for the buffers. However, vb2_queue requires choosing a single buffer type, which conflicts with the idea of capturing either video or metadata. The buffer type of vb2_queue can be changed, but it's not obvious how this should be done in the drivers. To help this, add a new helper function vb2_queue_change_type() which ensures the correct checks and documents how it can be used. Signed-off-by: Tomi Valkeinen Reviewed-by: Laurent Pinchart Acked-by: Tomasz Figa --- drivers/media/common/videobuf2/videobuf2-v4l2.c | 14 ++++++++++++++ include/media/videobuf2-v4l2.h | 15 +++++++++++++++ 2 files changed, 29 insertions(+) diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c index 7e96f67c60ba..2988bb38ceb1 100644 --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c @@ -939,6 +939,20 @@ void vb2_queue_release(struct vb2_queue *q) } EXPORT_SYMBOL_GPL(vb2_queue_release); +int vb2_queue_change_type(struct vb2_queue *q, unsigned int type) +{ + if (type == q->type) + return 0; + + if (vb2_is_busy(q)) + return -EBUSY; + + q->type = type; + + return 0; +} +EXPORT_SYMBOL_GPL(vb2_queue_change_type); + __poll_t vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) { struct video_device *vfd = video_devdata(file); diff --git a/include/media/videobuf2-v4l2.h b/include/media/videobuf2-v4l2.h index c203047eb834..12fa72a664cf 100644 --- a/include/media/videobuf2-v4l2.h +++ b/include/media/videobuf2-v4l2.h @@ -261,6 +261,21 @@ int __must_check vb2_queue_init_name(struct vb2_queue *q, const char *name); */ void vb2_queue_release(struct vb2_queue *q); +/** + * vb2_queue_change_type() - change the type of an inactive vb2_queue + * @q: pointer to &struct vb2_queue with videobuf2 queue. + * + * This function changes the type of the vb2_queue. This is only possible + * if the queue is not busy (i.e. no buffers have been allocated). + * + * vb2_queue_change_type() can be used to support multiple buffer types using + * the same queue. The driver can implement v4l2_ioctl_ops.vidioc_reqbufs and + * v4l2_ioctl_ops.vidioc_create_bufs functions and call vb2_queue_change_type() + * before calling vb2_ioctl_reqbufs() or vb2_ioctl_create_bufs(), and thus + * "lock" the buffer type until the buffers have been released. + */ +int vb2_queue_change_type(struct vb2_queue *q, unsigned int type); + /** * vb2_poll() - implements poll userspace operation * @q: pointer to &struct vb2_queue with videobuf2 queue.