From patchwork Wed Mar 13 15:30:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Klug X-Patchwork-Id: 19715 Return-Path: X-Original-To: parsemail@patchwork.libcamera.org Delivered-To: parsemail@patchwork.libcamera.org Received: from lancelot.ideasonboard.com (lancelot.ideasonboard.com [92.243.16.209]) by patchwork.libcamera.org (Postfix) with ESMTPS id 9B362BD160 for ; Wed, 13 Mar 2024 15:32:23 +0000 (UTC) Received: from lancelot.ideasonboard.com (localhost [IPv6:::1]) by lancelot.ideasonboard.com (Postfix) with ESMTP id 2BD8262C8B; Wed, 13 Mar 2024 16:32:22 +0100 (CET) Authentication-Results: lancelot.ideasonboard.com; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="vKEYO3rz"; dkim-atps=neutral Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647]) by lancelot.ideasonboard.com (Postfix) with ESMTPS id 3C91162C85 for ; Wed, 13 Mar 2024 16:32:20 +0100 (CET) Received: from jasper.fritz.box (unknown [IPv6:2a00:6020:448c:6c00:9b07:31b5:38e1:e957]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id BBF51A8F; Wed, 13 Mar 2024 16:31:56 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1710343917; bh=RYj/hTGFeOICAffBo+IOFSfUokMceJPXN3Xwefp5Ee4=; h=From:To:Cc:Subject:Date:From; b=vKEYO3rzSe33FG42cJPkl0ClUEYxkAfR9ZnW4wrdK56dAsnXCEpeOmIf5k6JImSk3 TK06yhx3ScUjKFrsHZJbiFV6CVzHVTbE4018kKNoISnJ48nxMgojTL2BIqVuLZTQsn QTxPOhHeCmU29xv7PCtcW3CjuD7uSYnaol0JUHXg= From: Stefan Klug To: libcamera-devel@lists.libcamera.org, linux-media@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] mipi-csis: Emit V4L2_EVENT_FRAME_SYNC events Date: Wed, 13 Mar 2024 16:30:58 +0100 Message-Id: <20240313153058.189684-1-stefan.klug@ideasonboard.com> X-Mailer: git-send-email 2.40.1 MIME-Version: 1.0 X-BeenThere: libcamera-devel@lists.libcamera.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Martin Kepplinger , Purism Kernel Team , Fabio Estevam , Sascha Hauer , Rui Miguel Silva , Pengutronix Kernel Team , Stefan Klug , Mauro Carvalho Chehab , Shawn Guo , NXP Linux Team Errors-To: libcamera-devel-bounces@lists.libcamera.org Sender: "libcamera-devel" The Samsung CSIS Mipi receiver provides a start-of-frame interrupt and a framecount register. As the CSI receiver is the hardware unit that lies closest to the sensor, the frame counter is the best we can get on these devices. In case of the ISI available on the i.MX8 M Plus it is also the only native start-of-frame signal available. This patch exposes the sof interrupt and the framecount as V4L2_EVENT_FRAME_SYNC event on the subdevice. It was tested on a Debix-Som-A with a 6.8-rc4 kernel. Signed-off-by: Stefan Klug Reviewed-by: Jacopo Mondi Reviewed-by: Umang Jain Reviewed-by: Laurent Pinchart --- drivers/media/platform/nxp/imx-mipi-csis.c | 34 +++++++++++++++++++++- 1 file changed, 33 insertions(+), 1 deletion(-) diff --git a/drivers/media/platform/nxp/imx-mipi-csis.c b/drivers/media/platform/nxp/imx-mipi-csis.c index db8ff5f5c4d3..caeb1622f741 100644 --- a/drivers/media/platform/nxp/imx-mipi-csis.c +++ b/drivers/media/platform/nxp/imx-mipi-csis.c @@ -30,6 +30,7 @@ #include #include +#include #include #include #include @@ -742,6 +743,18 @@ static void mipi_csis_stop_stream(struct mipi_csis_device *csis) mipi_csis_system_enable(csis, false); } +static void mipi_csis_queue_event_sof(struct mipi_csis_device *csis) +{ + struct v4l2_event event = { + .type = V4L2_EVENT_FRAME_SYNC, + }; + + u32 frame = mipi_csis_read(csis, MIPI_CSIS_FRAME_COUNTER_CH(0)); + + event.u.frame_sync.frame_sequence = frame; + v4l2_event_queue(csis->sd.devnode, &event); +} + static irqreturn_t mipi_csis_irq_handler(int irq, void *dev_id) { struct mipi_csis_device *csis = dev_id; @@ -765,6 +778,10 @@ static irqreturn_t mipi_csis_irq_handler(int irq, void *dev_id) event->counter++; } } + + if (status & MIPI_CSIS_INT_SRC_FRAME_START) + mipi_csis_queue_event_sof(csis); + spin_unlock_irqrestore(&csis->slock, flags); mipi_csis_write(csis, MIPI_CSIS_INT_SRC, status); @@ -1154,8 +1171,23 @@ static int mipi_csis_log_status(struct v4l2_subdev *sd) return 0; } +static int mipi_csis_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh, + struct v4l2_event_subscription *sub) +{ + if (sub->type != V4L2_EVENT_FRAME_SYNC) + return -EINVAL; + + /* V4L2_EVENT_FRAME_SYNC doesn't require an id, so zero should be set */ + if (sub->id != 0) + return -EINVAL; + + return v4l2_event_subscribe(fh, sub, 0, NULL); +} + static const struct v4l2_subdev_core_ops mipi_csis_core_ops = { .log_status = mipi_csis_log_status, + .subscribe_event = mipi_csis_subscribe_event, + .unsubscribe_event = v4l2_event_subdev_unsubscribe, }; static const struct v4l2_subdev_video_ops mipi_csis_video_ops = { @@ -1358,7 +1390,7 @@ static int mipi_csis_subdev_init(struct mipi_csis_device *csis) snprintf(sd->name, sizeof(sd->name), "csis-%s", dev_name(csis->dev)); - sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; + sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS; sd->ctrl_handler = NULL; sd->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;