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Date:   Fri, 9 Aug 2019 15:05:55 +0300
From:   Sakari Ailus <sakari.ailus@linux.intel.com>
To:     Helen Koike <helen.koike@collabora.com>
Cc:     linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org,
        eddie.cai.linux@gmail.com, mchehab@kernel.org, heiko@sntech.de,
        jacob2.chen@rock-chips.com, jeffy.chen@rock-chips.com,
        zyc@rock-chips.com, linux-kernel@vger.kernel.org,
        tfiga@chromium.org, hans.verkuil@cisco.com,
        laurent.pinchart@ideasonboard.com, kernel@collabora.com,
        ezequiel@collabora.com, linux-media@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, zhengsq@rock-chips.com,
        Jacob Chen <cc@rock-chips.com>,
        Allon Huang <allon.huang@rock-chips.com>
Subject: Re: [PATCH v8 09/14] media: rkisp1: add rockchip isp1 core driver
Message-ID: <20190809120554.GB6566@paasikivi.fi.intel.com>
References: <20190730184256.30338-1-helen.koike@collabora.com>
 <20190730184256.30338-10-helen.koike@collabora.com>
 <20190807152727.GN21370@paasikivi.fi.intel.com>
 <bca5e3fe-8a37-2b91-ae96-30378fd98012@collabora.com>
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Hi Helen,

On Thu, Aug 08, 2019 at 06:59:47PM -0300, Helen Koike wrote:
> Hi Sakari,
> 
> Thanks for your review, just some comments/questions below:
> 
> On 8/7/19 12:27 PM, Sakari Ailus wrote:
> > Hi Helen,
> > 
> > On Tue, Jul 30, 2019 at 03:42:51PM -0300, Helen Koike wrote:
> >> From: Jacob Chen <jacob2.chen@rock-chips.com>
> >>
> >> Add the core driver for rockchip isp1.
> >>
> >> Signed-off-by: Jacob Chen <jacob2.chen@rock-chips.com>
> >> Signed-off-by: Shunqian Zheng <zhengsq@rock-chips.com>
> >> Signed-off-by: Yichong Zhong <zyc@rock-chips.com>
> >> Signed-off-by: Jacob Chen <cc@rock-chips.com>
> >> Signed-off-by: Eddie Cai <eddie.cai.linux@gmail.com>
> >> Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
> >> Signed-off-by: Allon Huang <allon.huang@rock-chips.com>
> >> Signed-off-by: Tomasz Figa <tfiga@chromium.org>
> >> [fixed compilation and run time errors regarding new v4l2 async API]
> >> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> >> [Add missing module device table]
> >> Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
> >> [update for upstream]
> >> Signed-off-by: Helen Koike <helen.koike@collabora.com>
> >>
> >> ---
> >>
> >> Changes in v8: None
> >> Changes in v7:
> >> - VIDEO_ROCKCHIP_ISP1 selects VIDEOBUF2_VMALLOC
> >> - add PHY_ROCKCHIP_DPHY as a dependency for VIDEO_ROCKCHIP_ISP1
> >> - Fix compilation and runtime errors due to bitrotting
> >> The code has bit-rotten since March 2018, fix compilation errors.
> >> The new V4L2 async notifier API requires notifiers to be initialized by
> >> a call to v4l2_async_notifier_init() before being used, do so.
> >> - Add missing module device table
> >> - use clk_bulk framework
> >> - add missing notifiers cleanups
> >> - s/strlcpy/strscpy
> >> - normalize bus_info name
> >> - fix s_stream error path, stream_cnt wans't being decremented properly
> >> - use devm_platform_ioremap_resource() helper
> >> - s/deice/device
> >> - redesign: remove mipi/csi subdevice, sensors connect directly to the
> >> isp subdevice in the media topology now.
> >> - remove "saved_state" member from rkisp1_stream struct
> >> - Reverse the order of MIs
> >> - Simplify MI interrupt handling
> >> Rather than adding unnecessary indirection, just use stream index to
> >> handle MI interrupt enable/disable/clear, since the stream index matches
> >> the order of bits now, thanks to previous patch. While at it, remove
> >> some dead code.
> >> - code styling and checkpatch fixes
> >>
> >>  drivers/media/platform/Kconfig                |  12 +
> >>  drivers/media/platform/Makefile               |   1 +
> >>  drivers/media/platform/rockchip/isp1/Makefile |   7 +
> >>  drivers/media/platform/rockchip/isp1/common.h | 101 +++
> >>  drivers/media/platform/rockchip/isp1/dev.c    | 675 ++++++++++++++++++
> >>  drivers/media/platform/rockchip/isp1/dev.h    |  97 +++
> >>  6 files changed, 893 insertions(+)
> >>  create mode 100644 drivers/media/platform/rockchip/isp1/Makefile
> >>  create mode 100644 drivers/media/platform/rockchip/isp1/common.h
> >>  create mode 100644 drivers/media/platform/rockchip/isp1/dev.c
> >>  create mode 100644 drivers/media/platform/rockchip/isp1/dev.h
> >>
> >> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> >> index 89555f9a813f..e0e98937c565 100644
> >> --- a/drivers/media/platform/Kconfig
> >> +++ b/drivers/media/platform/Kconfig
> >> @@ -106,6 +106,18 @@ config VIDEO_QCOM_CAMSS
> >>  	select VIDEOBUF2_DMA_SG
> >>  	select V4L2_FWNODE
> >>  
> >> +config VIDEO_ROCKCHIP_ISP1
> >> +	tristate "Rockchip Image Signal Processing v1 Unit driver"
> >> +	depends on VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
> >> +	depends on ARCH_ROCKCHIP || COMPILE_TEST
> >> +	select VIDEOBUF2_DMA_CONTIG
> >> +	select VIDEOBUF2_VMALLOC
> >> +	select V4L2_FWNODE
> >> +	select PHY_ROCKCHIP_DPHY
> >> +	default n
> >> +	---help---
> >> +	  Support for ISP1 on the rockchip SoC.
> >> +
> >>  config VIDEO_S3C_CAMIF
> >>  	tristate "Samsung S3C24XX/S3C64XX SoC Camera Interface driver"
> >>  	depends on VIDEO_V4L2 && I2C && VIDEO_V4L2_SUBDEV_API
> >> diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
> >> index 7cbbd925124c..f9fcf8e7c513 100644
> >> --- a/drivers/media/platform/Makefile
> >> +++ b/drivers/media/platform/Makefile
> >> @@ -69,6 +69,7 @@ obj-$(CONFIG_VIDEO_RENESAS_FDP1)	+= rcar_fdp1.o
> >>  obj-$(CONFIG_VIDEO_RENESAS_JPU)		+= rcar_jpu.o
> >>  obj-$(CONFIG_VIDEO_RENESAS_VSP1)	+= vsp1/
> >>  
> >> +obj-$(CONFIG_VIDEO_ROCKCHIP_ISP1)	+= rockchip/isp1/
> >>  obj-$(CONFIG_VIDEO_ROCKCHIP_RGA)	+= rockchip/rga/
> >>  
> >>  obj-y	+= omap/
> >> diff --git a/drivers/media/platform/rockchip/isp1/Makefile b/drivers/media/platform/rockchip/isp1/Makefile
> >> new file mode 100644
> >> index 000000000000..72706e80fc8b
> >> --- /dev/null
> >> +++ b/drivers/media/platform/rockchip/isp1/Makefile
> >> @@ -0,0 +1,7 @@
> >> +obj-$(CONFIG_VIDEO_ROCKCHIP_ISP1) += 	rockchip-isp1.o
> >> +rockchip-isp1-objs 	   += 	rkisp1.o \
> >> +				dev.o \
> >> +				regs.o \
> >> +				isp_stats.o \
> >> +				isp_params.o \
> >> +				capture.o
> >> diff --git a/drivers/media/platform/rockchip/isp1/common.h b/drivers/media/platform/rockchip/isp1/common.h
> >> new file mode 100644
> >> index 000000000000..606ce2793546
> >> --- /dev/null
> >> +++ b/drivers/media/platform/rockchip/isp1/common.h
> >> @@ -0,0 +1,101 @@
> >> +/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
> >> +/*
> >> + * Rockchip isp1 driver
> >> + *
> >> + * Copyright (C) 2017 Rockchip Electronics Co., Ltd.
> >> + */
> >> +
> >> +#ifndef _RKISP1_COMMON_H
> >> +#define _RKISP1_COMMON_H
> >> +
> >> +#include <linux/mutex.h>
> >> +#include <media/media-device.h>
> >> +#include <media/media-entity.h>
> >> +#include <media/v4l2-ctrls.h>
> >> +#include <media/v4l2-device.h>
> >> +#include <media/videobuf2-v4l2.h>
> >> +
> >> +#define RKISP1_DEFAULT_WIDTH		800
> >> +#define RKISP1_DEFAULT_HEIGHT		600
> >> +
> >> +#define RKISP1_MAX_STREAM		2
> >> +#define RKISP1_STREAM_MP		0
> >> +#define RKISP1_STREAM_SP		1
> >> +
> >> +#define RKISP1_PLANE_Y			0
> >> +#define RKISP1_PLANE_CB			1
> >> +#define RKISP1_PLANE_CR			2
> >> +
> >> +enum rkisp1_sd_type {
> >> +	RKISP1_SD_SENSOR,
> >> +	RKISP1_SD_PHY_CSI,
> >> +	RKISP1_SD_VCM,
> >> +	RKISP1_SD_FLASH,
> >> +	RKISP1_SD_MAX,
> >> +};
> > 
> > I wonder if this is a leftover from the driver development time. Same goes
> > for the subdevs field in struct rkisp1_device.
> 
> It is a left over, I'm removing them for the next version, thanks.
> 
> > 
> >> +
> >> +/* One structure per video node */
> >> +struct rkisp1_vdev_node {
> >> +	struct vb2_queue buf_queue;
> >> +	/* vfd lock */
> >> +	struct mutex vlock;
> >> +	struct video_device vdev;
> >> +	struct media_pad pad;
> >> +};
> >> +
> >> +enum rkisp1_fmt_pix_type {
> >> +	FMT_YUV,
> >> +	FMT_RGB,
> >> +	FMT_BAYER,
> >> +	FMT_JPEG,
> >> +	FMT_MAX
> >> +};
> >> +
> >> +enum rkisp1_fmt_raw_pat_type {
> >> +	RAW_RGGB = 0,
> >> +	RAW_GRBG,
> >> +	RAW_GBRG,
> >> +	RAW_BGGR,
> >> +};
> >> +
> >> +struct rkisp1_buffer {
> >> +	struct vb2_v4l2_buffer vb;
> >> +	struct list_head queue;
> >> +	union {
> >> +		u32 buff_addr[VIDEO_MAX_PLANES];
> >> +		void *vaddr[VIDEO_MAX_PLANES];
> >> +	};
> >> +};
> >> +
> >> +struct rkisp1_dummy_buffer {
> >> +	void *vaddr;
> >> +	dma_addr_t dma_addr;
> >> +	u32 size;
> >> +};
> >> +
> >> +extern int rkisp1_debug;
> >> +
> >> +static inline
> >> +struct rkisp1_vdev_node *vdev_to_node(struct video_device *vdev)
> >> +{
> >> +	return container_of(vdev, struct rkisp1_vdev_node, vdev);
> >> +}
> >> +
> >> +static inline struct rkisp1_vdev_node *queue_to_node(struct vb2_queue *q)
> >> +{
> >> +	return container_of(q, struct rkisp1_vdev_node, buf_queue);
> >> +}
> >> +
> >> +static inline struct rkisp1_buffer *to_rkisp1_buffer(struct vb2_v4l2_buffer *vb)
> >> +{
> >> +	return container_of(vb, struct rkisp1_buffer, vb);
> >> +}
> >> +
> >> +static inline struct vb2_queue *to_vb2_queue(struct file *file)
> >> +{
> >> +	struct rkisp1_vdev_node *vnode = video_drvdata(file);
> >> +
> >> +	return &vnode->buf_queue;
> >> +}
> >> +
> >> +#endif /* _RKISP1_COMMON_H */
> >> diff --git a/drivers/media/platform/rockchip/isp1/dev.c b/drivers/media/platform/rockchip/isp1/dev.c
> >> new file mode 100644
> >> index 000000000000..2b4a67e1a3b5
> >> --- /dev/null
> >> +++ b/drivers/media/platform/rockchip/isp1/dev.c
> >> @@ -0,0 +1,675 @@
> >> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> >> +/*
> >> + * Rockchip isp1 driver
> >> + *
> >> + * Copyright (C) 2017 Rockchip Electronics Co., Ltd.
> >> + */
> >> +
> >> +#include <linux/clk.h>
> >> +#include <linux/interrupt.h>
> >> +#include <linux/module.h>
> >> +#include <linux/of.h>
> >> +#include <linux/of_graph.h>
> >> +#include <linux/of_platform.h>
> >> +#include <linux/pm_runtime.h>
> >> +#include <linux/pinctrl/consumer.h>
> >> +#include <linux/phy/phy.h>
> >> +#include <linux/phy/phy-mipi-dphy.h>
> >> +
> >> +#include "common.h"
> >> +#include "regs.h"
> >> +
> >> +struct isp_match_data {
> >> +	const char * const *clks;
> >> +	int size;
> > 
> > unsigned int
> 
> ack
> 
> > 
> >> +};
> >> +
> >> +struct sensor_async_subdev {
> >> +	struct v4l2_async_subdev asd;
> >> +	struct v4l2_mbus_config mbus;
> >> +	unsigned int lanes;
> >> +};
> >> +
> >> +int rkisp1_debug;
> >> +module_param_named(debug, rkisp1_debug, int, 0644);
> >> +MODULE_PARM_DESC(debug, "Debug level (0-1)");
> > 
> > Have you thought of using dynamic debug instead?
> 
> right, this is being used in v4l2_dbg(), which I can replace by dev_dbg()
> that is already covered by dynamic debug iirc.
> Should I also replace v4l2_err() by dev_err() (I always get confused by
> which log function I should use).

In case you switch to the dev_*() macros, then yes. The corresponding
v4l2_*() macros are still an entirely valid interface to use. But today we
likely wouldn't add such macros; I usually ask driver developers using both
to switch to the dev_*() ones.

> 
> > 
> >> +
> >> +/**************************** pipeline operations******************************/
> >> +
> >> +static int __isp_pipeline_prepare(struct rkisp1_pipeline *p,
> >> +				  struct media_entity *me)
> >> +{
> >> +	struct rkisp1_device *dev = container_of(p, struct rkisp1_device, pipe);
> >> +	struct v4l2_subdev *sd;
> >> +	unsigned int i;
> >> +
> >> +	p->num_subdevs = 0;
> >> +	memset(p->subdevs, 0, sizeof(p->subdevs));
> >> +
> >> +	while (1) {
> >> +		struct media_pad *pad = NULL;
> >> +
> >> +		/* Find remote source pad */
> >> +		for (i = 0; i < me->num_pads; i++) {
> >> +			struct media_pad *spad = &me->pads[i];
> >> +
> >> +			if (!(spad->flags & MEDIA_PAD_FL_SINK))
> >> +				continue;
> >> +			pad = media_entity_remote_pad(spad);
> >> +			if (pad)
> >> +				break;
> >> +		}
> >> +
> >> +		if (!pad)
> >> +			break;
> >> +
> >> +		sd = media_entity_to_v4l2_subdev(pad->entity);
> >> +		if (sd != &dev->isp_sdev.sd)
> >> +			p->subdevs[p->num_subdevs++] = sd;
> > 
> > How do you make sure you don't overrun the array?
> 
> Because the maximum path the topology can have is:
> sensor->rkisp->capture

The sensor may consist of more than one sub-device, and there may be
bridges such as parallel/CSI-2 ones in between. The latter would be an
unlikely hardware configuration for this ISP though as it supports both.

External ISPs in front of the camera sensor are another possibility.

Basically you can't make expectations of the topology outside the scope of
your own device --- the topology of which is known.

> 
> > 
> > Instead, I'd avoid maintaining the array in the first place --- the same
> > information is available from the MC framework data structures --- see e.g.
> > the omap3isp driver.
> 
> If I understand correctly, omap3isp navigates through the topology in the same way,
> but it just don't save in an array, but I reuse this information in other places,
> mostly for power up/down (see below why I don't use v4l2_pipeline_pm_use())

Correct.

> 
> > 
> >> +
> >> +		me = &sd->entity;
> >> +		if (me->num_pads == 1)
> >> +			break;
> >> +	}
> >> +	return 0;
> >> +}
> >> +
> >> +static int __subdev_set_power(struct v4l2_subdev *sd, int on)
> >> +{
> >> +	int ret;
> >> +
> >> +	if (!sd)
> >> +		return -ENXIO;
> >> +
> >> +	ret = v4l2_subdev_call(sd, core, s_power, on);
> >> +
> >> +	return ret != -ENOIOCTLCMD ? ret : 0;
> >> +}
> >> +
> >> +static int __isp_pipeline_s_power(struct rkisp1_pipeline *p, bool on)
> > 
> > Could you instead use v4l2_pipeline_pm_use()?
> 
> Unless I misunderstood this (which is very likely), v4l2_pipeline_pm_use() calls pipeline_pm_power(),
> that applies power change to all entities in a pipeline, but if I have two sensors
> connected to the ISP, one with link enabled and the other with a disabled link,
> I don't want to power both sensors on, just the one participating in that stream. And
> if I call v4l2_pipeline_pm_use() it will power on both, which is not what I want.
> 
> Does it make sense?

The v4l2_pipeline_pm_use() only follows the active links. A simplistic
implementation could power on all the subdevs in the graph but no; the
v4l2_pipeline_pm_use() exists for this very purpose.

> 
> > 
> >> +{
> >> +	struct rkisp1_device *dev = container_of(p, struct rkisp1_device, pipe);
> >> +	int i, ret;
> >> +
> >> +	if (on) {
> >> +		__subdev_set_power(&dev->isp_sdev.sd, true);
> >> +
> >> +		for (i = p->num_subdevs - 1; i >= 0; --i) {
> >> +			ret = __subdev_set_power(p->subdevs[i], true);
> >> +			if (ret < 0 && ret != -ENXIO)
> >> +				goto err_power_off;
> >> +		}
> >> +	} else {
> >> +		for (i = 0; i < p->num_subdevs; ++i)
> >> +			__subdev_set_power(p->subdevs[i], false);
> >> +
> >> +		__subdev_set_power(&dev->isp_sdev.sd, false);
> >> +	}
> >> +
> >> +	return 0;
> >> +
> >> +err_power_off:
> >> +	for (++i; i < p->num_subdevs; ++i)
> >> +		__subdev_set_power(p->subdevs[i], false);
> >> +	__subdev_set_power(&dev->isp_sdev.sd, true);
> >> +	return ret;
> >> +}
> >> +
> >> +static int rkisp1_pipeline_open(struct rkisp1_pipeline *p,
> >> +				struct media_entity *me,
> >> +				bool prepare)
> >> +{
> >> +	int ret;
> >> +
> >> +	if (WARN_ON(!p || !me))
> >> +		return -EINVAL;
> >> +	if (atomic_inc_return(&p->power_cnt) > 1)
> >> +		return 0;
> >> +
> >> +	/* go through media graphic and get subdevs */
> >> +	if (prepare)
> >> +		__isp_pipeline_prepare(p, me);
> >> +
> >> +	if (!p->num_subdevs)
> >> +		return -EINVAL;
> >> +
> >> +	ret = __isp_pipeline_s_power(p, 1);
> >> +	if (ret < 0)
> >> +		return ret;
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +static int rkisp1_pipeline_close(struct rkisp1_pipeline *p)
> >> +{
> >> +	int ret;
> >> +
> >> +	if (atomic_dec_return(&p->power_cnt) > 0)
> >> +		return 0;
> >> +	ret = __isp_pipeline_s_power(p, 0);
> >> +
> >> +	return ret == -ENXIO ? 0 : ret;
> >> +}
> >> +
> >> +/*
> >> + * stream-on order: isp_subdev, mipi dphy, sensor
> >> + * stream-off order: mipi dphy, sensor, isp_subdev
> >> + */
> >> +static int rkisp1_pipeline_set_stream(struct rkisp1_pipeline *p, bool on)
> >> +{
> >> +	struct rkisp1_device *dev = container_of(p, struct rkisp1_device, pipe);
> >> +	int i, ret;
> >> +
> >> +	if ((on && atomic_inc_return(&p->stream_cnt) > 1) ||
> >> +	    (!on && atomic_dec_return(&p->stream_cnt) > 0))
> >> +		return 0;
> >> +
> >> +	if (on) {
> >> +		ret = v4l2_subdev_call(&dev->isp_sdev.sd, video, s_stream,
> >> +				       true);
> >> +		if (ret && ret != -ENOIOCTLCMD && ret != -ENODEV) {
> >> +			v4l2_err(&dev->v4l2_dev,
> >> +				 "s_stream failed on subdevice %s (%d)\n",
> >> +				 dev->isp_sdev.sd.name,
> >> +				 ret);
> >> +			atomic_dec(&p->stream_cnt);
> >> +			return ret;
> >> +		}
> >> +	}
> >> +
> >> +	/* phy -> sensor */
> >> +	for (i = 0; i < p->num_subdevs; ++i) {
> >> +		ret = v4l2_subdev_call(p->subdevs[i], video, s_stream, on);
> >> +		if (on && ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
> >> +			goto err_stream_off;
> > 
> > You should stop after the first external sub-device.
> > 
> > It seems even the omap3isp driver doesn't do that. It's not easy to spot
> > such issues indeed.
> 
> I'm not sure I understand, what do you call an external sub-device? Is the sensor
> an external subdevice?

One that is not controlled by this driver.

> 
> > 
> >> +	}
> >> +
> >> +	if (!on)
> >> +		v4l2_subdev_call(&dev->isp_sdev.sd, video, s_stream, false);
> >> +
> >> +	return 0;
> >> +
> >> +err_stream_off:
> >> +	for (--i; i >= 0; --i)
> >> +		v4l2_subdev_call(p->subdevs[i], video, s_stream, false);
> >> +	v4l2_subdev_call(&dev->isp_sdev.sd, video, s_stream, false);
> >> +	atomic_dec(&p->stream_cnt);
> >> +	return ret;
> >> +}
> >> +
> >> +/***************************** media controller *******************************/
> >> +/* See http://opensource.rock-chips.com/wiki_Rockchip-isp1 for Topology */
> > 
> > The host appears to be down, or there's a routing problem. Unless this is
> > fixed, having such a URL here doesn't do much good. :-I
> 
> This is a left over, sorry about that.
> I can access the URL now. I'll try to get some of the docs and move to the kernel docs.

I wonder if the server is only powered on during the local office hours.
;-)

More seriously, I looked into this and it seems there's a routing problem
somewhere between my ISP and that server. From a few other places the
server is reachable.

> 
> > 
> >> +
> >> +static int rkisp1_create_links(struct rkisp1_device *dev)
> >> +{
> >> +	struct media_entity *source, *sink;
> >> +	struct rkisp1_sensor *sensor;
> >> +	unsigned int flags, pad;
> >> +	int ret;
> >> +
> >> +	/* sensor links(or mipi-phy) */
> >> +	list_for_each_entry(sensor, &dev->sensors, list) {
> >> +		for (pad = 0; pad < sensor->sd->entity.num_pads; pad++)
> >> +			if (sensor->sd->entity.pads[pad].flags &
> >> +				MEDIA_PAD_FL_SOURCE)
> >> +				break;
> > 
> > Could you use media_entity_get_fwnode_pad() instead?
> 
> Yes, I didn't know about it actually, thanks for that, looks cleaner (I'll send in
> the next version).
> 
> > 
> >> +
> >> +		if (pad == sensor->sd->entity.num_pads) {
> >> +			dev_err(dev->dev,
> >> +				"failed to find src pad for %s\n",
> >> +				sensor->sd->name);
> >> +
> >> +			return -ENXIO;
> >> +		}
> >> +
> >> +		ret = media_create_pad_link(
> >> +				&sensor->sd->entity, pad,
> >> +				&dev->isp_sdev.sd.entity,
> >> +				RKISP1_ISP_PAD_SINK,
> >> +				list_is_first(&sensor->list, &dev->sensors) ?
> >> +				MEDIA_LNK_FL_ENABLED : 0);
> >> +		if (ret) {
> >> +			dev_err(dev->dev,
> >> +				"failed to create link for %s\n",
> >> +				sensor->sd->name);
> >> +			return ret;
> >> +		}
> >> +	}
> >> +
> >> +	/* params links */
> >> +	source = &dev->params_vdev.vnode.vdev.entity;
> >> +	sink = &dev->isp_sdev.sd.entity;
> >> +	flags = MEDIA_LNK_FL_ENABLED;
> >> +	ret = media_create_pad_link(source, 0, sink,
> >> +				       RKISP1_ISP_PAD_SINK_PARAMS, flags);
> >> +	if (ret < 0)
> >> +		return ret;
> >> +
> >> +	/* create isp internal links */
> >> +	/* SP links */
> >> +	source = &dev->isp_sdev.sd.entity;
> >> +	sink = &dev->stream[RKISP1_STREAM_SP].vnode.vdev.entity;
> >> +	ret = media_create_pad_link(source, RKISP1_ISP_PAD_SOURCE_PATH,
> >> +				       sink, 0, flags);
> >> +	if (ret < 0)
> >> +		return ret;
> >> +
> >> +	/* MP links */
> >> +	source = &dev->isp_sdev.sd.entity;
> >> +	sink = &dev->stream[RKISP1_STREAM_MP].vnode.vdev.entity;
> >> +	ret = media_create_pad_link(source, RKISP1_ISP_PAD_SOURCE_PATH,
> >> +				       sink, 0, flags);
> >> +	if (ret < 0)
> >> +		return ret;
> >> +
> >> +	/* 3A stats links */
> >> +	source = &dev->isp_sdev.sd.entity;
> >> +	sink = &dev->stats_vdev.vnode.vdev.entity;
> >> +	return media_create_pad_link(source, RKISP1_ISP_PAD_SOURCE_STATS,
> >> +					sink, 0, flags);
> > 
> > Indentation. Same for the calls to the same function above.
> 
> ack
> 
> > 
> >> +}
> >> +
> >> +static int subdev_notifier_bound(struct v4l2_async_notifier *notifier,
> >> +				 struct v4l2_subdev *sd,
> >> +				 struct v4l2_async_subdev *asd)
> >> +{
> >> +	struct rkisp1_device *isp_dev = container_of(notifier,
> >> +						     struct rkisp1_device,
> >> +						     notifier);
> >> +	struct sensor_async_subdev *s_asd = container_of(asd,
> >> +					struct sensor_async_subdev, asd);
> >> +	struct rkisp1_sensor *sensor;
> >> +
> >> +	sensor = devm_kzalloc(isp_dev->dev, sizeof(*sensor), GFP_KERNEL);
> >> +	if (!sensor)
> >> +		return -ENOMEM;
> >> +
> >> +	sensor->lanes = s_asd->lanes;
> >> +	sensor->mbus = s_asd->mbus;
> >> +	sensor->sd = sd;
> >> +	sensor->dphy = devm_phy_get(isp_dev->dev, "dphy");
> >> +	if (IS_ERR(sensor->dphy)) {
> >> +		if (PTR_ERR(sensor->dphy) != -EPROBE_DEFER)
> >> +			dev_err(isp_dev->dev, "Couldn't get the MIPI D-PHY\n");
> >> +		return PTR_ERR(sensor->dphy);
> >> +	}
> >> +	phy_init(sensor->dphy);
> >> +
> >> +	list_add(&sensor->list, &isp_dev->sensors);
> > 
> > In general, maintaining the information on the external subdevs on your own
> > adds complexity to the driver. You can get the information when you need it
> > from the data structures maintained by MC (see e.g. the omap3isp driver for
> > examples).
> > 
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +static struct rkisp1_sensor *sd_to_sensor(struct rkisp1_device *dev,
> >> +					  struct v4l2_subdev *sd)
> >> +{
> >> +	struct rkisp1_sensor *sensor;
> >> +
> >> +	list_for_each_entry(sensor, &dev->sensors, list)
> >> +		if (sensor->sd == sd)
> >> +			return sensor;
> >> +
> >> +	return NULL;
> >> +}
> >> +
> >> +static void subdev_notifier_unbind(struct v4l2_async_notifier *notifier,
> >> +				   struct v4l2_subdev *sd,
> >> +				   struct v4l2_async_subdev *asd)
> >> +{
> >> +	struct rkisp1_device *isp_dev = container_of(notifier,
> >> +						     struct rkisp1_device,
> >> +						     notifier);
> >> +	struct rkisp1_sensor *sensor = sd_to_sensor(isp_dev, sd);
> >> +
> >> +	/* TODO: check if a lock is required here */
> >> +	list_del(&sensor->list);
> >> +
> >> +	phy_exit(sensor->dphy);
> >> +}
> >> +
> >> +static int subdev_notifier_complete(struct v4l2_async_notifier *notifier)
> >> +{
> >> +	struct rkisp1_device *dev = container_of(notifier, struct rkisp1_device,
> >> +						 notifier);
> >> +	int ret;
> >> +
> >> +	mutex_lock(&dev->media_dev.graph_mutex);
> >> +	ret = rkisp1_create_links(dev);
> >> +	if (ret < 0)
> >> +		goto unlock;
> >> +	ret = v4l2_device_register_subdev_nodes(&dev->v4l2_dev);
> >> +	if (ret < 0)
> >> +		goto unlock;
> >> +
> >> +	v4l2_info(&dev->v4l2_dev, "Async subdev notifier completed\n");
> >> +
> >> +unlock:
> >> +	mutex_unlock(&dev->media_dev.graph_mutex);
> >> +	return ret;
> >> +}
> >> +
> >> +static int rkisp1_fwnode_parse(struct device *dev,
> >> +			       struct v4l2_fwnode_endpoint *vep,
> >> +			       struct v4l2_async_subdev *asd)
> >> +{
> >> +	struct sensor_async_subdev *s_asd =
> >> +			container_of(asd, struct sensor_async_subdev, asd);
> >> +
> >> +	if (vep->bus_type != V4L2_MBUS_CSI2_DPHY) {
> >> +		dev_err(dev, "Only CSI2 bus type is currently supported\n");
> >> +		return -EINVAL;
> >> +	}
> >> +
> >> +	if (vep->base.port != 0) {
> >> +		dev_err(dev, "The ISP has only port 0\n");
> >> +		return -EINVAL;
> >> +	}
> >> +
> >> +	s_asd->mbus.type = vep->bus_type;
> >> +	s_asd->mbus.flags = vep->bus.mipi_csi2.flags;
> >> +	s_asd->lanes = vep->bus.mipi_csi2.num_data_lanes;
> >> +
> >> +	switch (vep->bus.mipi_csi2.num_data_lanes) {
> >> +	case 1:
> >> +		s_asd->mbus.flags |= V4L2_MBUS_CSI2_1_LANE;
> >> +		break;
> >> +	case 2:
> >> +		s_asd->mbus.flags |= V4L2_MBUS_CSI2_2_LANE;
> >> +		break;
> >> +	case 3:
> >> +		s_asd->mbus.flags |= V4L2_MBUS_CSI2_3_LANE;
> >> +		break;
> >> +	case 4:
> >> +		s_asd->mbus.flags |= V4L2_MBUS_CSI2_4_LANE;
> >> +		break;
> >> +	default:
> >> +		return -EINVAL;
> >> +	}
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +static const struct v4l2_async_notifier_operations subdev_notifier_ops = {
> >> +	.bound = subdev_notifier_bound,
> >> +	.unbind = subdev_notifier_unbind,
> >> +	.complete = subdev_notifier_complete,
> >> +};
> >> +
> >> +static int isp_subdev_notifier(struct rkisp1_device *isp_dev)
> >> +{
> >> +	struct v4l2_async_notifier *ntf = &isp_dev->notifier;
> >> +	struct device *dev = isp_dev->dev;
> >> +	int ret;
> >> +
> >> +	v4l2_async_notifier_init(ntf);
> >> +
> >> +	ret = v4l2_async_notifier_parse_fwnode_endpoints_by_port(
> >> +		dev, ntf, sizeof(struct sensor_async_subdev), 0,
> >> +		rkisp1_fwnode_parse);
> >> +	if (ret < 0)
> >> +		return ret;
> >> +
> >> +	if (list_empty(&ntf->asd_list))
> >> +		return -ENODEV;	/* no endpoint */
> >> +
> >> +	ntf->ops = &subdev_notifier_ops;
> >> +
> >> +	return v4l2_async_notifier_register(&isp_dev->v4l2_dev, ntf);
> >> +}
> >> +
> >> +/***************************** platform device *******************************/
> >> +
> >> +static int rkisp1_register_platform_subdevs(struct rkisp1_device *dev)
> >> +{
> >> +	int ret;
> >> +
> >> +	ret = rkisp1_register_isp_subdev(dev, &dev->v4l2_dev);
> >> +	if (ret < 0)
> >> +		return ret;
> >> +
> >> +	ret = rkisp1_register_stream_vdevs(dev);
> >> +	if (ret < 0)
> >> +		goto err_unreg_isp_subdev;
> >> +
> >> +	ret = rkisp1_register_stats_vdev(&dev->stats_vdev, &dev->v4l2_dev, dev);
> >> +	if (ret < 0)
> >> +		goto err_unreg_stream_vdev;
> >> +
> >> +	ret = rkisp1_register_params_vdev(&dev->params_vdev, &dev->v4l2_dev,
> >> +					  dev);
> >> +	if (ret < 0)
> >> +		goto err_unreg_stats_vdev;
> >> +
> >> +	ret = isp_subdev_notifier(dev);
> >> +	if (ret < 0) {
> >> +		v4l2_err(&dev->v4l2_dev,
> >> +			 "Failed to register subdev notifier(%d)\n", ret);
> >> +		goto err_unreg_params_vdev;
> >> +	}
> >> +
> >> +	return 0;
> >> +err_unreg_params_vdev:
> >> +	rkisp1_unregister_params_vdev(&dev->params_vdev);
> >> +err_unreg_stats_vdev:
> >> +	rkisp1_unregister_stats_vdev(&dev->stats_vdev);
> >> +err_unreg_stream_vdev:
> >> +	rkisp1_unregister_stream_vdevs(dev);
> >> +err_unreg_isp_subdev:
> >> +	rkisp1_unregister_isp_subdev(dev);
> >> +	return ret;
> >> +}
> >> +
> >> +static const char * const rk3399_isp_clks[] = {
> >> +	"clk_isp",
> >> +	"aclk_isp",
> >> +	"hclk_isp",
> >> +	"aclk_isp_wrap",
> >> +	"hclk_isp_wrap",
> >> +};
> >> +
> >> +static const char * const rk3288_isp_clks[] = {
> >> +	"clk_isp",
> >> +	"aclk_isp",
> >> +	"hclk_isp",
> >> +	"pclk_isp_in",
> >> +	"sclk_isp_jpe",
> >> +};
> >> +
> >> +static const struct isp_match_data rk3288_isp_clk_data = {
> >> +	.clks = rk3288_isp_clks,
> >> +	.size = ARRAY_SIZE(rk3288_isp_clks),
> >> +};
> >> +
> >> +static const struct isp_match_data rk3399_isp_clk_data = {
> >> +	.clks = rk3399_isp_clks,
> >> +	.size = ARRAY_SIZE(rk3399_isp_clks),
> >> +};
> >> +
> >> +static const struct of_device_id rkisp1_plat_of_match[] = {
> >> +	{
> >> +		.compatible = "rockchip,rk3288-cif-isp",
> >> +		.data = &rk3288_isp_clk_data,
> >> +	}, {
> >> +		.compatible = "rockchip,rk3399-cif-isp",
> >> +		.data = &rk3399_isp_clk_data,
> >> +	},
> >> +	{},
> >> +};
> >> +MODULE_DEVICE_TABLE(of, rkisp1_plat_of_match);
> >> +
> >> +static irqreturn_t rkisp1_irq_handler(int irq, void *ctx)
> >> +{
> >> +	struct device *dev = ctx;
> >> +	struct rkisp1_device *rkisp1_dev = dev_get_drvdata(dev);
> >> +	unsigned int mis_val;
> >> +
> >> +	mis_val = readl(rkisp1_dev->base_addr + CIF_ISP_MIS);
> >> +	if (mis_val)
> >> +		rkisp1_isp_isr(mis_val, rkisp1_dev);
> >> +
> >> +	mis_val = readl(rkisp1_dev->base_addr + CIF_MIPI_MIS);
> >> +	if (mis_val)
> >> +		rkisp1_mipi_isr(mis_val, rkisp1_dev);
> >> +
> >> +	mis_val = readl(rkisp1_dev->base_addr + CIF_MI_MIS);
> >> +	if (mis_val)
> >> +		rkisp1_mi_isr(mis_val, rkisp1_dev);
> >> +
> >> +	return IRQ_HANDLED;
> >> +}
> >> +
> >> +static int rkisp1_plat_probe(struct platform_device *pdev)
> >> +{
> >> +	struct device_node *node = pdev->dev.of_node;
> >> +	const struct isp_match_data *clk_data;
> >> +	const struct of_device_id *match;
> >> +	struct device *dev = &pdev->dev;
> >> +	struct rkisp1_device *isp_dev;
> >> +	struct v4l2_device *v4l2_dev;
> >> +	unsigned int i;
> >> +	int ret, irq;
> >> +
> >> +	match = of_match_node(rkisp1_plat_of_match, node);
> >> +	isp_dev = devm_kzalloc(dev, sizeof(*isp_dev), GFP_KERNEL);
> >> +	if (!isp_dev)
> >> +		return -ENOMEM;
> >> +
> >> +	INIT_LIST_HEAD(&isp_dev->sensors);
> >> +
> >> +	dev_set_drvdata(dev, isp_dev);
> >> +	isp_dev->dev = dev;
> >> +
> >> +	isp_dev->base_addr = devm_platform_ioremap_resource(pdev, 0);
> >> +	if (IS_ERR(isp_dev->base_addr))
> >> +		return PTR_ERR(isp_dev->base_addr);
> >> +
> >> +	irq = platform_get_irq(pdev, 0);
> >> +	if (irq < 0)
> >> +		return irq;
> >> +
> >> +	ret = devm_request_irq(dev, irq, rkisp1_irq_handler, IRQF_SHARED,
> >> +			       dev_driver_string(dev), dev);
> >> +	if (ret < 0) {
> >> +		dev_err(dev, "request irq failed: %d\n", ret);
> >> +		return ret;
> >> +	}
> >> +
> >> +	isp_dev->irq = irq;
> >> +	clk_data = match->data;
> >> +
> >> +	for (i = 0; i < clk_data->size; i++)
> >> +		isp_dev->clks[i].id = clk_data->clks[i];
> >> +	ret = devm_clk_bulk_get(dev, clk_data->size, isp_dev->clks);
> >> +	if (ret)
> >> +		return ret;
> >> +	isp_dev->clk_size = clk_data->size;
> >> +
> >> +	atomic_set(&isp_dev->pipe.power_cnt, 0);
> >> +	atomic_set(&isp_dev->pipe.stream_cnt, 0);
> >> +	isp_dev->pipe.open = rkisp1_pipeline_open;
> >> +	isp_dev->pipe.close = rkisp1_pipeline_close;
> >> +	isp_dev->pipe.set_stream = rkisp1_pipeline_set_stream;
> >> +
> >> +	rkisp1_stream_init(isp_dev, RKISP1_STREAM_SP);
> >> +	rkisp1_stream_init(isp_dev, RKISP1_STREAM_MP);
> >> +
> >> +	strscpy(isp_dev->media_dev.model, "rkisp1",
> >> +		sizeof(isp_dev->media_dev.model));
> >> +	isp_dev->media_dev.dev = &pdev->dev;
> >> +	strscpy(isp_dev->media_dev.bus_info,
> >> +		"platform: " DRIVER_NAME, sizeof(isp_dev->media_dev.bus_info));
> >> +	media_device_init(&isp_dev->media_dev);
> >> +
> >> +	v4l2_dev = &isp_dev->v4l2_dev;
> >> +	v4l2_dev->mdev = &isp_dev->media_dev;
> >> +	strscpy(v4l2_dev->name, "rkisp1", sizeof(v4l2_dev->name));
> >> +	v4l2_ctrl_handler_init(&isp_dev->ctrl_handler, 5);
> >> +	v4l2_dev->ctrl_handler = &isp_dev->ctrl_handler;
> >> +
> >> +	ret = v4l2_device_register(isp_dev->dev, &isp_dev->v4l2_dev);
> >> +	if (ret < 0)
> > 
> > Once you've initialised the control handler, you'll need to free it in case
> > of an error. I.e. add one more label for that purpose near the end.
> 
> control handler is not required, I'll remove it for the next version.
> 
> > 
> >> +		return ret;
> >> +
> >> +	ret = media_device_register(&isp_dev->media_dev);
> >> +	if (ret < 0) {
> >> +		v4l2_err(v4l2_dev, "Failed to register media device: %d\n",
> >> +			 ret);
> >> +		goto err_unreg_v4l2_dev;
> >> +	}
> >> +
> >> +	/* create & register platefom subdev (from of_node) */
> >> +	ret = rkisp1_register_platform_subdevs(isp_dev);
> >> +	if (ret < 0)
> >> +		goto err_unreg_media_dev;
> >> +
> >> +	pm_runtime_enable(&pdev->dev);
> >> +
> >> +	return 0;
> >> +
> >> +err_unreg_media_dev:
> >> +	media_device_unregister(&isp_dev->media_dev);
> >> +err_unreg_v4l2_dev:
> >> +	v4l2_device_unregister(&isp_dev->v4l2_dev);
> >> +	return ret;
> >> +}
> >> +
> >> +static int rkisp1_plat_remove(struct platform_device *pdev)
> >> +{
> >> +	struct rkisp1_device *isp_dev = platform_get_drvdata(pdev);
> >> +
> >> +	pm_runtime_disable(&pdev->dev);
> >> +	media_device_unregister(&isp_dev->media_dev);
> >> +	v4l2_async_notifier_unregister(&isp_dev->notifier);
> >> +	v4l2_async_notifier_cleanup(&isp_dev->notifier);
> >> +	v4l2_device_unregister(&isp_dev->v4l2_dev);
> >> +	rkisp1_unregister_params_vdev(&isp_dev->params_vdev);
> >> +	rkisp1_unregister_stats_vdev(&isp_dev->stats_vdev);
> >> +	rkisp1_unregister_stream_vdevs(isp_dev);
> >> +	rkisp1_unregister_isp_subdev(isp_dev);
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +static int __maybe_unused rkisp1_runtime_suspend(struct device *dev)
> >> +{
> >> +	struct rkisp1_device *isp_dev = dev_get_drvdata(dev);
> >> +
> >> +	clk_bulk_disable_unprepare(isp_dev->clk_size, isp_dev->clks);
> >> +	return pinctrl_pm_select_sleep_state(dev);
> >> +}
> >> +
> >> +static int __maybe_unused rkisp1_runtime_resume(struct device *dev)
> >> +{
> >> +	struct rkisp1_device *isp_dev = dev_get_drvdata(dev);
> >> +	int ret;
> >> +
> >> +	ret = pinctrl_pm_select_default_state(dev);
> >> +	if (ret < 0)
> >> +		return ret;
> >> +	ret = clk_bulk_prepare_enable(isp_dev->clk_size, isp_dev->clks);
> >> +	if (ret < 0)
> >> +		return ret;
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +static const struct dev_pm_ops rkisp1_plat_pm_ops = {
> >> +	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> >> +				pm_runtime_force_resume)
> >> +	SET_RUNTIME_PM_OPS(rkisp1_runtime_suspend, rkisp1_runtime_resume, NULL)
> >> +};
> >> +
> >> +static struct platform_driver rkisp1_plat_drv = {
> >> +	.driver = {
> >> +		.name = DRIVER_NAME,
> >> +		.of_match_table = of_match_ptr(rkisp1_plat_of_match),
> >> +		.pm = &rkisp1_plat_pm_ops,
> >> +	},
> >> +	.probe = rkisp1_plat_probe,
> >> +	.remove = rkisp1_plat_remove,
> >> +};
> >> +
> >> +module_platform_driver(rkisp1_plat_drv);
> >> +MODULE_AUTHOR("Rockchip Camera/ISP team");
> >> +MODULE_DESCRIPTION("Rockchip ISP1 platform driver");
> >> +MODULE_LICENSE("Dual BSD/GPL");
> > 
> > BSD or MIT?
> 
> Thanks for spotting this, I'll verify.

I think this was the only place where the BSD license was present. The file
header has MIT.

> 
> > 
> >> diff --git a/drivers/media/platform/rockchip/isp1/dev.h b/drivers/media/platform/rockchip/isp1/dev.h
> >> new file mode 100644
> >> index 000000000000..f7cbee316523
> >> --- /dev/null
> >> +++ b/drivers/media/platform/rockchip/isp1/dev.h
> >> @@ -0,0 +1,97 @@
> >> +/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
> >> +/*
> >> + * Rockchip isp1 driver
> >> + *
> >> + * Copyright (C) 2017 Rockchip Electronics Co., Ltd.
> >> + */
> >> +
> >> +#ifndef _RKISP1_DEV_H
> >> +#define _RKISP1_DEV_H
> >> +
> >> +#include <linux/clk.h>
> >> +
> >> +#include "capture.h"
> >> +#include "rkisp1.h"
> >> +#include "isp_params.h"
> >> +#include "isp_stats.h"
> >> +
> >> +#define DRIVER_NAME "rkisp1"
> >> +#define ISP_VDEV_NAME DRIVER_NAME  "_ispdev"
> >> +#define SP_VDEV_NAME DRIVER_NAME   "_selfpath"
> >> +#define MP_VDEV_NAME DRIVER_NAME   "_mainpath"
> >> +#define DMA_VDEV_NAME DRIVER_NAME  "_dmapath"
> >> +
> >> +#define GRP_ID_SENSOR			BIT(0)
> >> +#define GRP_ID_MIPIPHY			BIT(1)
> >> +#define GRP_ID_ISP			BIT(2)
> >> +#define GRP_ID_ISP_MP			BIT(3)
> >> +#define GRP_ID_ISP_SP			BIT(4)
> >> +
> >> +#define RKISP1_MAX_BUS_CLK	8
> >> +#define RKISP1_MAX_SENSOR	2
> >> +#define RKISP1_MAX_PIPELINE	4
> >> +
> >> +/*
> >> + * struct rkisp1_pipeline - An ISP hardware pipeline
> >> + *
> >> + * Capture device call other devices via pipeline
> >> + *
> >> + * @num_subdevs: number of linked subdevs
> >> + * @power_cnt: pipeline power count
> >> + * @stream_cnt: stream power count
> >> + */
> >> +struct rkisp1_pipeline {
> >> +	struct media_pipeline pipe;
> >> +	int num_subdevs;
> >> +	atomic_t power_cnt;
> >> +	atomic_t stream_cnt;
> >> +	struct v4l2_subdev *subdevs[RKISP1_MAX_PIPELINE];
> >> +	int (*open)(struct rkisp1_pipeline *p,
> >> +		    struct media_entity *me, bool prepare);
> >> +	int (*close)(struct rkisp1_pipeline *p);
> >> +	int (*set_stream)(struct rkisp1_pipeline *p, bool on);
> >> +};
> >> +
> >> +/*
> >> + * struct rkisp1_sensor - Sensor information
> >> + * @mbus: media bus configuration
> >> + */
> >> +struct rkisp1_sensor {
> >> +	struct v4l2_subdev *sd;
> >> +	struct v4l2_mbus_config mbus;
> >> +	unsigned int lanes;
> >> +	struct phy *dphy;
> >> +	struct list_head list;
> >> +};
> > 
> > You seem to also have struct sensor_async_subdev that appears to contain
> > similar information. Would it be possible to unify the two?
> > 
> > This would appear to allow you getting rid of functions such as
> > sd_to_sensor, for instance.
> 
> ack, I managed to get rid of this, and I don't even need to keep them
> on a list, I'll submit in the next version.

Nice!

> 
> Thanks a lot for your review

You're welcome!

-- 
Kind regards,

Sakari Ailus
sakari.ailus@linux.intel.com