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 X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 7AFF0C433E0 for ; Sat, 16 Jan 2021 17:17:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4EFD820732 for ; Sat, 16 Jan 2021 17:17:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727187AbhAPRFn (ORCPT ); Sat, 16 Jan 2021 12:05:43 -0500 Received: from mslow2.mail.gandi.net ([217.70.178.242]:35928 "EHLO mslow2.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727066AbhAPQkL (ORCPT ); Sat, 16 Jan 2021 11:40:11 -0500 Received: from relay1-d.mail.gandi.net (unknown [217.70.183.193]) by mslow2.mail.gandi.net (Postfix) with ESMTP id 89F803B4123 for ; Sat, 16 Jan 2021 15:35:49 +0000 (UTC) X-Originating-IP: 93.61.96.190 Received: from uno.localdomain (93-61-96-190.ip145.fastwebnet.it [93.61.96.190]) (Authenticated sender: jacopo@jmondi.org) by relay1-d.mail.gandi.net (Postfix) with ESMTPSA id BC7E1240006; Sat, 16 Jan 2021 15:34:45 +0000 (UTC) Date: Sat, 16 Jan 2021 16:35:04 +0100 From: Jacopo Mondi To: Ezequiel Garcia Cc: linux-media@vger.kernel.org, Hans Verkuil , kernel@collabora.com, Laurent Pinchart , Sakari Ailus Subject: Re: [PATCH 02/13] media: stm32-dcmi: Use v4l2_async_notifier_add_fwnode_remote_subdev helpers Message-ID: <20210116153504.5hmyxiqcwlbvnvzd@uno.localdomain> References: <20210112132339.5621-1-ezequiel@collabora.com> <20210112132339.5621-3-ezequiel@collabora.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20210112132339.5621-3-ezequiel@collabora.com> Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Hi Ezequiel, On Tue, Jan 12, 2021 at 10:23:28AM -0300, Ezequiel Garcia wrote: > The use of v4l2_async_notifier_add_subdev is discouraged. > Drivers are instead encouraged to use a helper such as > v4l2_async_notifier_add_fwnode_remote_subdev. > > This fixes a misuse of the API, as v4l2_async_notifier_add_subdev > should get a kmalloc'ed struct v4l2_async_subdev, > removing some boilerplate code while at it. > > Use the appropriate helper v4l2_async_notifier_add_fwnode_remote_subdev, > which handles the needed setup, instead of open-coding it. > > This results in removal of the now unneeded driver-specific state > struct dcmi_graph_entity, keeping track of just the source > subdevice. > > Signed-off-by: Ezequiel Garcia > --- > drivers/media/platform/stm32/stm32-dcmi.c | 86 ++++++++--------------- > 1 file changed, 30 insertions(+), 56 deletions(-) > > diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c > index b745f1342c2e..142f63d07dcd 100644 > --- a/drivers/media/platform/stm32/stm32-dcmi.c > +++ b/drivers/media/platform/stm32/stm32-dcmi.c > @@ -99,13 +99,6 @@ enum state { > > #define OVERRUN_ERROR_THRESHOLD 3 > > -struct dcmi_graph_entity { > - struct v4l2_async_subdev asd; > - > - struct device_node *remote_node; > - struct v4l2_subdev *source; > -}; > - > struct dcmi_format { > u32 fourcc; > u32 mbus_code; > @@ -139,7 +132,7 @@ struct stm32_dcmi { > struct v4l2_device v4l2_dev; > struct video_device *vdev; > struct v4l2_async_notifier notifier; > - struct dcmi_graph_entity entity; > + struct v4l2_subdev *source; > struct v4l2_format fmt; > struct v4l2_rect crop; > bool do_crop; > @@ -610,7 +603,7 @@ static int dcmi_pipeline_s_fmt(struct stm32_dcmi *dcmi, > struct v4l2_subdev_pad_config *pad_cfg, > struct v4l2_subdev_format *format) > { > - struct media_entity *entity = &dcmi->entity.source->entity; > + struct media_entity *entity = &dcmi->source->entity; > struct v4l2_subdev *subdev; > struct media_pad *sink_pad = NULL; > struct media_pad *src_pad = NULL; > @@ -1018,7 +1011,7 @@ static int dcmi_try_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f, > } > > v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code); > - ret = v4l2_subdev_call(dcmi->entity.source, pad, set_fmt, > + ret = v4l2_subdev_call(dcmi->source, pad, set_fmt, > &pad_cfg, &format); > if (ret < 0) > return ret; > @@ -1152,7 +1145,7 @@ static int dcmi_get_sensor_format(struct stm32_dcmi *dcmi, > }; > int ret; > > - ret = v4l2_subdev_call(dcmi->entity.source, pad, get_fmt, NULL, &fmt); > + ret = v4l2_subdev_call(dcmi->source, pad, get_fmt, NULL, &fmt); > if (ret) > return ret; > > @@ -1181,7 +1174,7 @@ static int dcmi_set_sensor_format(struct stm32_dcmi *dcmi, > } > > v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code); > - ret = v4l2_subdev_call(dcmi->entity.source, pad, set_fmt, > + ret = v4l2_subdev_call(dcmi->source, pad, set_fmt, > &pad_cfg, &format); > if (ret < 0) > return ret; > @@ -1204,7 +1197,7 @@ static int dcmi_get_sensor_bounds(struct stm32_dcmi *dcmi, > /* > * Get sensor bounds first > */ > - ret = v4l2_subdev_call(dcmi->entity.source, pad, get_selection, > + ret = v4l2_subdev_call(dcmi->source, pad, get_selection, > NULL, &bounds); > if (!ret) > *r = bounds.r; > @@ -1385,7 +1378,7 @@ static int dcmi_enum_framesizes(struct file *file, void *fh, > > fse.code = sd_fmt->mbus_code; > > - ret = v4l2_subdev_call(dcmi->entity.source, pad, enum_frame_size, > + ret = v4l2_subdev_call(dcmi->source, pad, enum_frame_size, > NULL, &fse); > if (ret) > return ret; > @@ -1402,7 +1395,7 @@ static int dcmi_g_parm(struct file *file, void *priv, > { > struct stm32_dcmi *dcmi = video_drvdata(file); > > - return v4l2_g_parm_cap(video_devdata(file), dcmi->entity.source, p); > + return v4l2_g_parm_cap(video_devdata(file), dcmi->source, p); > } > > static int dcmi_s_parm(struct file *file, void *priv, > @@ -1410,7 +1403,7 @@ static int dcmi_s_parm(struct file *file, void *priv, > { > struct stm32_dcmi *dcmi = video_drvdata(file); > > - return v4l2_s_parm_cap(video_devdata(file), dcmi->entity.source, p); > + return v4l2_s_parm_cap(video_devdata(file), dcmi->source, p); > } > > static int dcmi_enum_frameintervals(struct file *file, void *fh, > @@ -1432,7 +1425,7 @@ static int dcmi_enum_frameintervals(struct file *file, void *fh, > > fie.code = sd_fmt->mbus_code; > > - ret = v4l2_subdev_call(dcmi->entity.source, pad, > + ret = v4l2_subdev_call(dcmi->source, pad, > enum_frame_interval, NULL, &fie); > if (ret) > return ret; > @@ -1452,7 +1445,7 @@ MODULE_DEVICE_TABLE(of, stm32_dcmi_of_match); > static int dcmi_open(struct file *file) > { > struct stm32_dcmi *dcmi = video_drvdata(file); > - struct v4l2_subdev *sd = dcmi->entity.source; > + struct v4l2_subdev *sd = dcmi->source; > int ret; > > if (mutex_lock_interruptible(&dcmi->lock)) > @@ -1483,7 +1476,7 @@ static int dcmi_open(struct file *file) > static int dcmi_release(struct file *file) > { > struct stm32_dcmi *dcmi = video_drvdata(file); > - struct v4l2_subdev *sd = dcmi->entity.source; > + struct v4l2_subdev *sd = dcmi->source; > bool fh_singular; > int ret; > > @@ -1616,7 +1609,7 @@ static int dcmi_formats_init(struct stm32_dcmi *dcmi) > { > const struct dcmi_format *sd_fmts[ARRAY_SIZE(dcmi_formats)]; > unsigned int num_fmts = 0, i, j; > - struct v4l2_subdev *subdev = dcmi->entity.source; > + struct v4l2_subdev *subdev = dcmi->source; > struct v4l2_subdev_mbus_code_enum mbus_code = { > .which = V4L2_SUBDEV_FORMAT_ACTIVE, > }; > @@ -1675,7 +1668,7 @@ static int dcmi_formats_init(struct stm32_dcmi *dcmi) > static int dcmi_framesizes_init(struct stm32_dcmi *dcmi) > { > unsigned int num_fsize = 0; > - struct v4l2_subdev *subdev = dcmi->entity.source; > + struct v4l2_subdev *subdev = dcmi->source; > struct v4l2_subdev_frame_size_enum fse = { > .which = V4L2_SUBDEV_FORMAT_ACTIVE, > .code = dcmi->sd_format->mbus_code, > @@ -1727,14 +1720,13 @@ static int dcmi_graph_notify_complete(struct v4l2_async_notifier *notifier) > * we search for the source subdevice > * in order to expose it through V4L2 interface > */ > - dcmi->entity.source = > - media_entity_to_v4l2_subdev(dcmi_find_source(dcmi)); > - if (!dcmi->entity.source) { > + dcmi->source = media_entity_to_v4l2_subdev(dcmi_find_source(dcmi)); > + if (!dcmi->source) { > dev_err(dcmi->dev, "Source subdevice not found\n"); > return -ENODEV; > } > > - dcmi->vdev->ctrl_handler = dcmi->entity.source->ctrl_handler; > + dcmi->vdev->ctrl_handler = dcmi->source->ctrl_handler; > > ret = dcmi_formats_init(dcmi); > if (ret) { > @@ -1813,46 +1805,28 @@ static const struct v4l2_async_notifier_operations dcmi_graph_notify_ops = { > .complete = dcmi_graph_notify_complete, > }; > > -static int dcmi_graph_parse(struct stm32_dcmi *dcmi, struct device_node *node) > -{ > - struct device_node *ep = NULL; > - struct device_node *remote; > - > - ep = of_graph_get_next_endpoint(node, ep); > - if (!ep) > - return -EINVAL; > - > - remote = of_graph_get_remote_port_parent(ep); > - of_node_put(ep); > - if (!remote) > - return -EINVAL; > - > - /* Remote node to connect */ > - dcmi->entity.remote_node = remote; > - dcmi->entity.asd.match_type = V4L2_ASYNC_MATCH_FWNODE; > - dcmi->entity.asd.match.fwnode = of_fwnode_handle(remote); > - return 0; > -} > - > static int dcmi_graph_init(struct stm32_dcmi *dcmi) > { > + struct v4l2_async_subdev *asd; > + struct device_node *ep; > int ret; > > - /* Parse the graph to extract a list of subdevice DT nodes. */ > - ret = dcmi_graph_parse(dcmi, dcmi->dev->of_node); > - if (ret < 0) { > - dev_err(dcmi->dev, "Failed to parse graph\n"); > - return ret; > + ep = of_graph_get_next_endpoint(dcmi->dev->of_node, NULL); > + if (!ep) { > + dev_err(dcmi->dev, "Failed to get next endpoint\n"); > + return -EINVAL; Maybe -ENODEV, but I'm not sure we have any convention here, so do what you like the most :) > } > > v4l2_async_notifier_init(&dcmi->notifier); > > - ret = v4l2_async_notifier_add_subdev(&dcmi->notifier, > - &dcmi->entity.asd); > - if (ret) { > + asd = v4l2_async_notifier_add_fwnode_remote_subdev( > + &dcmi->notifier, of_fwnode_handle(ep), sizeof(*asd)); &dcmi->notifier might fit on the the previous line, but it's a matter of tastes. I don't have hw to test, but it looks good at a first look Reviewed-by: Jacopo Mondi Thanks j > + > + of_node_put(ep); > + > + if (IS_ERR(asd)) { > dev_err(dcmi->dev, "Failed to add subdev notifier\n"); > - of_node_put(dcmi->entity.remote_node); > - return ret; > + return PTR_ERR(asd); > } > > dcmi->notifier.ops = &dcmi_graph_notify_ops; > -- > 2.29.2 >