Subject: Re: [PATCH v8 05/14] media: rkisp1: add Rockchip ISP1 subdev driver

From: Dafna Hirschfeld <[email-masked]>
Date: Sat, 11 Jul 2020 13:04:31 +0200

Hi Laurent,

On 16.08.19 02:13, Laurent Pinchart wrote:
> Hello Helen,
> 
> Thank you for the patch.
> 
> On Tue, Jul 30, 2019 at 03:42:47PM -0300, Helen Koike wrote:
>> From: Jacob Chen <[email-masked]>
>>
>> Add the subdev driver for rockchip isp1.
>>
>> Signed-off-by: Jacob Chen <[email-masked]>
>> Signed-off-by: Shunqian Zheng <[email-masked]>
>> Signed-off-by: Yichong Zhong <[email-masked]>
>> Signed-off-by: Jacob Chen <[email-masked]>
>> Signed-off-by: Eddie Cai <[email-masked]>
>> Signed-off-by: Jeffy Chen <[email-masked]>
>> Signed-off-by: Allon Huang <[email-masked]>
>> Signed-off-by: Tomasz Figa <[email-masked]>
>> [fixed unknown entity type / switched to PIXEL_RATE]
>> Signed-off-by: Ezequiel Garcia <[email-masked]>
>> [update for upstream]
>> Signed-off-by: Helen Koike <[email-masked]>
>>
>> ---
>>
>> Changes in v8: None
>> Changes in v7:
>> - fixed warning because of unknown entity type
>> - fixed v4l2-compliance errors regarding rkisp1 formats, try formats
>> and default values
>> - fix typo riksp1/rkisp1
>> - redesign: remove mipi/csi subdevice, sensors connect directly to the
>> isp subdevice in the media topology now. As a consequence, remove the
>> hack in mipidphy_g_mbus_config() where information from the sensor was
>> being propagated through the topology.
>> - From the old dphy:
>>          * cache get_remote_sensor() in s_stream
>>          * use V4L2_CID_PIXEL_RATE instead of V4L2_CID_LINK_FREQ
>> - Replace stream state with a boolean
>> - code styling and checkpatch fixes
>> - fix stop_stream (return after calling stop, do not reenable the stream)
>> - fix rkisp1_isp_sd_get_selection when V4L2_SUBDEV_FORMAT_TRY is set
>> - fix get format in output (isp_sd->out_fmt.mbus_code was being ignored)
>> - s/intput/input
>> - remove #define sd_to_isp_sd(_sd), add a static inline as it will be
>> reused by the capture
>>
>>   drivers/media/platform/rockchip/isp1/rkisp1.c | 1286 +++++++++++++++++
>>   drivers/media/platform/rockchip/isp1/rkisp1.h |  111 ++
>>   2 files changed, 1397 insertions(+)
>>   create mode 100644 drivers/media/platform/rockchip/isp1/rkisp1.c
>>   create mode 100644 drivers/media/platform/rockchip/isp1/rkisp1.h
>>
>> diff --git a/drivers/media/platform/rockchip/isp1/rkisp1.c b/drivers/media/platform/rockchip/isp1/rkisp1.c
>> new file mode 100644
>> index 000000000000..6d0c0ffb5e03
>> --- /dev/null
>> +++ b/drivers/media/platform/rockchip/isp1/rkisp1.c
>> @@ -0,0 +1,1286 @@
>> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
>> +/*
>> + * Rockchip isp1 driver
> 
> Shouldn't each file describe what it contains ? Maybe
> 
>   * Rockchip ISP1 Driver - ISP Core
> 
> for this one ? Same for other .c or .h files.
> 
>> + *
>> + * Copyright (C) 2017 Rockchip Electronics Co., Ltd.
>> + */
>> +
>> +#include <linux/iopoll.h>
>> +#include <linux/phy/phy.h>
>> +#include <linux/phy/phy-mipi-dphy.h>
>> +#include <linux/pm_runtime.h>
>> +#include <linux/videodev2.h>
>> +#include <linux/vmalloc.h>
>> +#include <media/v4l2-event.h>
>> +
>> +#include "common.h"
>> +#include "regs.h"
> 
> common.h and regs.h aren't available yet. This won't break bisection as
> this file isn't referenced from the makefile yet, but it makes it a bit
> annoying when reviewing patches in order :-S
> 
>> +
>> +#define CIF_ISP_INPUT_W_MAX		4032
>> +#define CIF_ISP_INPUT_H_MAX		3024
>> +#define CIF_ISP_INPUT_W_MIN		32
>> +#define CIF_ISP_INPUT_H_MIN		32
>> +#define CIF_ISP_OUTPUT_W_MAX		CIF_ISP_INPUT_W_MAX
>> +#define CIF_ISP_OUTPUT_H_MAX		CIF_ISP_INPUT_H_MAX
>> +#define CIF_ISP_OUTPUT_W_MIN		CIF_ISP_INPUT_W_MIN
>> +#define CIF_ISP_OUTPUT_H_MIN		CIF_ISP_INPUT_H_MIN
>> +
>> +/*
>> + * NOTE: MIPI controller and input MUX are also configured in this file,
>> + * because ISP Subdev is not only describe ISP submodule(input size,format,
>> + * output size, format), but also a virtual route device.
>> + */
>> +
>> +/*
>> + * There are many variables named with format/frame in below code,
>> + * please see here for their meaning.
>> + *
>> + * Cropping regions of ISP
>> + *
>> + * +---------------------------------------------------------+
>> + * | Sensor image                                            |
>> + * | +---------------------------------------------------+   |
>> + * | | ISP_ACQ (for black level)                         |   |
>> + * | | in_frm                                            |   |
>> + * | | +--------------------------------------------+    |   |
>> + * | | |    ISP_OUT                                 |    |   |
>> + * | | |    in_crop                                 |    |   |
> 
> in_crop at the ISP output ? That seems a bit weird. I'm guessing that
> this is really the ISP output, while ISP_IS is related to the resizer ?
> 
>> + * | | |    +---------------------------------+     |    |   |
>> + * | | |    |   ISP_IS                        |     |    |   |
>> + * | | |    |   rkisp1_isp_subdev: out_crop   |     |    |   |
>> + * | | |    +---------------------------------+     |    |   |
>> + * | | +--------------------------------------------+    |   |
>> + * | +---------------------------------------------------+   |
>> + * +---------------------------------------------------------+
>> + */
>> +
>> +static inline struct rkisp1_device *sd_to_isp_dev(struct v4l2_subdev *sd)
>> +{
>> +	return container_of(sd->v4l2_dev, struct rkisp1_device, v4l2_dev);
>> +}
>> +
>> +/* Get sensor by enabled media link */
>> +static struct v4l2_subdev *get_remote_sensor(struct v4l2_subdev *sd)
>> +{
>> +	struct media_pad *local, *remote;
>> +	struct media_entity *sensor_me;
>> +
>> +	local = &sd->entity.pads[RKISP1_ISP_PAD_SINK];
>> +	remote = media_entity_remote_pad(local);
>> +	if (!remote) {
>> +		v4l2_warn(sd, "No link between isp and sensor\n");
>> +		return NULL;
>> +	}
>> +
>> +	sensor_me = media_entity_remote_pad(local)->entity;
>> +	return media_entity_to_v4l2_subdev(sensor_me);
>> +}
>> +
>> +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;
>> +}
>> +
>> +/****************  register operations ****************/
>> +
>> +/*
>> + * Image Stabilization.
>> + * This should only be called when configuring CIF
>> + * or at the frame end interrupt
>> + */
>> +static void rkisp1_config_ism(struct rkisp1_device *dev)
>> +{
>> +	void __iomem *base = dev->base_addr;
>> +	struct v4l2_rect *out_crop = &dev->isp_sdev.out_crop;
>> +	u32 val;
>> +
>> +	writel(0, base + CIF_ISP_IS_RECENTER);
> 
> How about read/write wrappers that take a rkisp1_device pointer, a
> register offset and a value (for the write wrapper) and compute
> dev->base_addr + offset internally ? That would make the code easier to
> read.
> 
>> +	writel(0, base + CIF_ISP_IS_MAX_DX);
>> +	writel(0, base + CIF_ISP_IS_MAX_DY);
>> +	writel(0, base + CIF_ISP_IS_DISPLACE);
>> +	writel(out_crop->left, base + CIF_ISP_IS_H_OFFS);
>> +	writel(out_crop->top, base + CIF_ISP_IS_V_OFFS);
>> +	writel(out_crop->width, base + CIF_ISP_IS_H_SIZE);
>> +	writel(out_crop->height, base + CIF_ISP_IS_V_SIZE);
>> +
>> +	/* IS(Image Stabilization) is always on, working as output crop */
>> +	writel(1, base + CIF_ISP_IS_CTRL);
>> +	val = readl(base + CIF_ISP_CTRL);
>> +	val |= CIF_ISP_CTRL_ISP_CFG_UPD;
>> +	writel(val, base + CIF_ISP_CTRL);
>> +}
>> +
>> +/*
>> + * configure isp blocks with input format, size......
>> + */
>> +static int rkisp1_config_isp(struct rkisp1_device *dev)
>> +{
>> +	u32 isp_ctrl = 0, irq_mask = 0, acq_mult = 0, signal = 0;
>> +	struct v4l2_rect *out_crop, *in_crop;
>> +	void __iomem *base = dev->base_addr;
>> +	struct v4l2_mbus_framefmt *in_frm;
>> +	struct ispsd_out_fmt *out_fmt;
>> +	struct rkisp1_sensor *sensor;
>> +	struct ispsd_in_fmt *in_fmt;
>> +
>> +	sensor = dev->active_sensor;
>> +	in_frm = &dev->isp_sdev.in_frm;
>> +	in_fmt = &dev->isp_sdev.in_fmt;
>> +	out_fmt = &dev->isp_sdev.out_fmt;
>> +	out_crop = &dev->isp_sdev.out_crop;
>> +	in_crop = &dev->isp_sdev.in_crop;
>> +
>> +	if (in_fmt->fmt_type == FMT_BAYER) {
>> +		acq_mult = 1;
>> +		if (out_fmt->fmt_type == FMT_BAYER) {
>> +			if (sensor->mbus.type == V4L2_MBUS_BT656)
>> +				isp_ctrl =
>> +					CIF_ISP_CTRL_ISP_MODE_RAW_PICT_ITU656;
>> +			else
>> +				isp_ctrl =
>> +					CIF_ISP_CTRL_ISP_MODE_RAW_PICT;
>> +		} else {
>> +			writel(CIF_ISP_DEMOSAIC_TH(0xc),
>> +			       base + CIF_ISP_DEMOSAIC);
>> +
>> +			if (sensor->mbus.type == V4L2_MBUS_BT656)
>> +				isp_ctrl = CIF_ISP_CTRL_ISP_MODE_BAYER_ITU656;
>> +			else
>> +				isp_ctrl = CIF_ISP_CTRL_ISP_MODE_BAYER_ITU601;
>> +		}
>> +	} else if (in_fmt->fmt_type == FMT_YUV) {
>> +		acq_mult = 2;
>> +		if (sensor->mbus.type == V4L2_MBUS_CSI2_DPHY) {
>> +			isp_ctrl = CIF_ISP_CTRL_ISP_MODE_ITU601;
>> +		} else {
>> +			if (sensor->mbus.type == V4L2_MBUS_BT656)
>> +				isp_ctrl = CIF_ISP_CTRL_ISP_MODE_ITU656;
>> +			else
>> +				isp_ctrl = CIF_ISP_CTRL_ISP_MODE_ITU601;
>> +
>> +		}
>> +
>> +		irq_mask |= CIF_ISP_DATA_LOSS;
>> +	}
>> +
>> +	/* Set up input acquisition properties */
>> +	if (sensor->mbus.type == V4L2_MBUS_BT656 ||
>> +	    sensor->mbus.type == V4L2_MBUS_PARALLEL) {
>> +		if (sensor->mbus.flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
>> +			signal = CIF_ISP_ACQ_PROP_POS_EDGE;
>> +	}
>> +
>> +	if (sensor->mbus.type == V4L2_MBUS_PARALLEL) {
>> +		if (sensor->mbus.flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
>> +			signal |= CIF_ISP_ACQ_PROP_VSYNC_LOW;
>> +
>> +		if (sensor->mbus.flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
>> +			signal |= CIF_ISP_ACQ_PROP_HSYNC_LOW;
>> +	}
>> +
>> +	writel(isp_ctrl, base + CIF_ISP_CTRL);
>> +	writel(signal | in_fmt->yuv_seq |
>> +	       CIF_ISP_ACQ_PROP_BAYER_PAT(in_fmt->bayer_pat) |
>> +	       CIF_ISP_ACQ_PROP_FIELD_SEL_ALL, base + CIF_ISP_ACQ_PROP);
>> +	writel(0, base + CIF_ISP_ACQ_NR_FRAMES);
>> +
>> +	/* Acquisition Size */
>> +	writel(0, base + CIF_ISP_ACQ_H_OFFS);
>> +	writel(0, base + CIF_ISP_ACQ_V_OFFS);
>> +	writel(acq_mult * in_frm->width, base + CIF_ISP_ACQ_H_SIZE);
>> +	writel(in_frm->height, base + CIF_ISP_ACQ_V_SIZE);
>> +
>> +	/* ISP Out Area */
>> +	writel(in_crop->left, base + CIF_ISP_OUT_H_OFFS);
>> +	writel(in_crop->top, base + CIF_ISP_OUT_V_OFFS);
>> +	writel(in_crop->width, base + CIF_ISP_OUT_H_SIZE);
>> +	writel(in_crop->height, base + CIF_ISP_OUT_V_SIZE);
>> +
>> +	/* interrupt mask */
>> +	irq_mask |= CIF_ISP_FRAME | CIF_ISP_V_START | CIF_ISP_PIC_SIZE_ERROR |
>> +		    CIF_ISP_FRAME_IN;
>> +	writel(irq_mask, base + CIF_ISP_IMSC);
>> +
>> +	if (out_fmt->fmt_type == FMT_BAYER)
>> +		rkisp1_params_disable_isp(&dev->params_vdev);
>> +	else
>> +		rkisp1_params_configure_isp(&dev->params_vdev, in_fmt,
>> +					    dev->isp_sdev.quantization);
>> +
>> +	return 0;
>> +}
>> +
>> +static int rkisp1_config_dvp(struct rkisp1_device *dev)
>> +{
>> +	struct ispsd_in_fmt *in_fmt = &dev->isp_sdev.in_fmt;
>> +	void __iomem *base = dev->base_addr;
>> +	u32 val, input_sel;
>> +
>> +	switch (in_fmt->bus_width) {
>> +	case 8:
>> +		input_sel = CIF_ISP_ACQ_PROP_IN_SEL_8B_ZERO;
>> +		break;
>> +	case 10:
>> +		input_sel = CIF_ISP_ACQ_PROP_IN_SEL_10B_ZERO;
>> +		break;
>> +	case 12:
>> +		input_sel = CIF_ISP_ACQ_PROP_IN_SEL_12B;
>> +		break;
>> +	default:
>> +		v4l2_err(&dev->v4l2_dev, "Invalid bus width\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	val = readl(base + CIF_ISP_ACQ_PROP);
>> +	writel(val | input_sel, base + CIF_ISP_ACQ_PROP);
>> +
>> +	return 0;
>> +}
>> +
>> +static int rkisp1_config_mipi(struct rkisp1_device *dev)
>> +{
>> +	struct ispsd_in_fmt *in_fmt = &dev->isp_sdev.in_fmt;
>> +	struct rkisp1_sensor *sensor = dev->active_sensor;
>> +	void __iomem *base = dev->base_addr;
>> +	unsigned int lanes;
>> +	u32 mipi_ctrl;
>> +
>> +	/*
>> +	 * sensor->mbus is set in isp or d-phy notifier_bound function
>> +	 */
>> +	switch (sensor->mbus.flags & V4L2_MBUS_CSI2_LANES) {
>> +	case V4L2_MBUS_CSI2_4_LANE:
>> +		lanes = 4;
>> +		break;
>> +	case V4L2_MBUS_CSI2_3_LANE:
>> +		lanes = 3;
>> +		break;
>> +	case V4L2_MBUS_CSI2_2_LANE:
>> +		lanes = 2;
>> +		break;
>> +	case V4L2_MBUS_CSI2_1_LANE:
>> +		lanes = 1;
>> +		break;
>> +	default:
>> +		return -EINVAL;
>> +	}
>> +
>> +	mipi_ctrl = CIF_MIPI_CTRL_NUM_LANES(lanes - 1) |
>> +		    CIF_MIPI_CTRL_SHUTDOWNLANES(0xf) |
>> +		    CIF_MIPI_CTRL_ERR_SOT_SYNC_HS_SKIP |
>> +		    CIF_MIPI_CTRL_CLOCKLANE_ENA;
>> +
>> +	writel(mipi_ctrl, base + CIF_MIPI_CTRL);
>> +
>> +	/* Configure Data Type and Virtual Channel */
>> +	writel(CIF_MIPI_DATA_SEL_DT(in_fmt->mipi_dt) | CIF_MIPI_DATA_SEL_VC(0),
>> +	       base + CIF_MIPI_IMG_DATA_SEL);
>> +
>> +	/* Clear MIPI interrupts */
>> +	writel(~0, base + CIF_MIPI_ICR);
>> +	/*
>> +	 * Disable CIF_MIPI_ERR_DPHY interrupt here temporary for
>> +	 * isp bus may be dead when switch isp.
>> +	 */
>> +	writel(CIF_MIPI_FRAME_END | CIF_MIPI_ERR_CSI | CIF_MIPI_ERR_DPHY |
>> +	       CIF_MIPI_SYNC_FIFO_OVFLW(0x03) | CIF_MIPI_ADD_DATA_OVFLW,
>> +	       base + CIF_MIPI_IMSC);
>> +
>> +	v4l2_dbg(1, rkisp1_debug, &dev->v4l2_dev, "\n  MIPI_CTRL 0x%08x\n"
>> +		 "  MIPI_IMG_DATA_SEL 0x%08x\n"
>> +		 "  MIPI_STATUS 0x%08x\n"
>> +		 "  MIPI_IMSC 0x%08x\n",
>> +		 readl(base + CIF_MIPI_CTRL),
>> +		 readl(base + CIF_MIPI_IMG_DATA_SEL),
>> +		 readl(base + CIF_MIPI_STATUS),
>> +		 readl(base + CIF_MIPI_IMSC));
>> +
>> +	return 0;
>> +}
>> +
>> +/* Configure MUX */
>> +static int rkisp1_config_path(struct rkisp1_device *dev)
>> +{
>> +	struct rkisp1_sensor *sensor = dev->active_sensor;
>> +	u32 dpcl = readl(dev->base_addr + CIF_VI_DPCL);
>> +	int ret = 0;
>> +
>> +	if (sensor->mbus.type == V4L2_MBUS_BT656 ||
>> +	    sensor->mbus.type == V4L2_MBUS_PARALLEL) {
>> +		ret = rkisp1_config_dvp(dev);
>> +		dpcl |= CIF_VI_DPCL_IF_SEL_PARALLEL;
>> +	} else if (sensor->mbus.type == V4L2_MBUS_CSI2_DPHY) {
>> +		ret = rkisp1_config_mipi(dev);
>> +		dpcl |= CIF_VI_DPCL_IF_SEL_MIPI;
>> +	}
>> +
>> +	writel(dpcl, dev->base_addr + CIF_VI_DPCL);
>> +
>> +	return ret;
>> +}
>> +
>> +/* Hareware configure Entry */
> 
> s/Hareware/Hardware/
> 
>> +static int rkisp1_config_cif(struct rkisp1_device *dev)
>> +{
>> +	u32 cif_id;
>> +	int ret;
>> +
>> +	v4l2_dbg(1, rkisp1_debug, &dev->v4l2_dev,
>> +		 "SP streaming = %d, MP streaming = %d\n",
>> +		 dev->stream[RKISP1_STREAM_SP].streaming,
>> +		 dev->stream[RKISP1_STREAM_MP].streaming);
>> +
>> +	cif_id = readl(dev->base_addr + CIF_VI_ID);
>> +	v4l2_dbg(1, rkisp1_debug, &dev->v4l2_dev, "CIF_ID 0x%08x\n", cif_id);
>> +
>> +	ret = rkisp1_config_isp(dev);
>> +	if (ret < 0)
>> +		return ret;
>> +	ret = rkisp1_config_path(dev);
>> +	if (ret < 0)
>> +		return ret;
>> +	rkisp1_config_ism(dev);
>> +
>> +	return 0;
>> +}
>> +
>> +/* Mess register operations to stop isp */
> 
> Is it such a mess ? :-)
> 
> I would capitalise ISP in all comments.
> 
>> +static int rkisp1_isp_stop(struct rkisp1_device *dev)
>> +{
>> +	void __iomem *base = dev->base_addr;
>> +	u32 val;
>> +
>> +	v4l2_dbg(1, rkisp1_debug, &dev->v4l2_dev,
>> +		 "SP streaming = %d, MP streaming = %d\n",
>> +		 dev->stream[RKISP1_STREAM_SP].streaming,
>> +		 dev->stream[RKISP1_STREAM_MP].streaming);
>> +
>> +	/*
>> +	 * ISP(mi) stop in mi frame end -> Stop ISP(mipi) ->
>> +	 * Stop ISP(isp) ->wait for ISP isp off
>> +	 */
>> +	/* stop and clear MI, MIPI, and ISP interrupts */
>> +	writel(0, base + CIF_MIPI_IMSC);
>> +	writel(~0, base + CIF_MIPI_ICR);
>> +
>> +	writel(0, base + CIF_ISP_IMSC);
>> +	writel(~0, base + CIF_ISP_ICR);
>> +
>> +	writel(0, base + CIF_MI_IMSC);
>> +	writel(~0, base + CIF_MI_ICR);
>> +	val = readl(base + CIF_MIPI_CTRL);
>> +	writel(val & (~CIF_MIPI_CTRL_OUTPUT_ENA), base + CIF_MIPI_CTRL);
>> +	/* stop ISP */
>> +	val = readl(base + CIF_ISP_CTRL);
>> +	val &= ~(CIF_ISP_CTRL_ISP_INFORM_ENABLE | CIF_ISP_CTRL_ISP_ENABLE);
>> +	writel(val, base + CIF_ISP_CTRL);
>> +
>> +	val = readl(base + CIF_ISP_CTRL);
>> +	writel(val | CIF_ISP_CTRL_ISP_CFG_UPD, base + CIF_ISP_CTRL);
>> +
>> +	readx_poll_timeout(readl, base + CIF_ISP_RIS,
>> +			   val, val & CIF_ISP_OFF, 20, 100);
>> +	v4l2_dbg(1, rkisp1_debug, &dev->v4l2_dev,
>> +		"streaming(MP:%d, SP:%d), MI_CTRL:%x, ISP_CTRL:%x, MIPI_CTRL:%x\n",
>> +		 dev->stream[RKISP1_STREAM_SP].streaming,
>> +		 dev->stream[RKISP1_STREAM_MP].streaming,
>> +		 readl(base + CIF_MI_CTRL),
>> +		 readl(base + CIF_ISP_CTRL),
>> +		 readl(base + CIF_MIPI_CTRL));
>> +
>> +	writel(CIF_IRCL_MIPI_SW_RST | CIF_IRCL_ISP_SW_RST, base + CIF_IRCL);
>> +	writel(0x0, base + CIF_IRCL);
>> +
>> +	return 0;
>> +}
>> +
>> +/* Mess register operations to start isp */
>> +static int rkisp1_isp_start(struct rkisp1_device *dev)
>> +{
>> +	struct rkisp1_sensor *sensor = dev->active_sensor;
>> +	void __iomem *base = dev->base_addr;
>> +	u32 val;
>> +
>> +	v4l2_dbg(1, rkisp1_debug, &dev->v4l2_dev,
>> +		 "SP streaming = %d, MP streaming = %d\n",
>> +		 dev->stream[RKISP1_STREAM_SP].streaming,
>> +		 dev->stream[RKISP1_STREAM_MP].streaming);
>> +
>> +	/* Activate MIPI */
>> +	if (sensor->mbus.type == V4L2_MBUS_CSI2_DPHY) {
>> +		val = readl(base + CIF_MIPI_CTRL);
>> +		writel(val | CIF_MIPI_CTRL_OUTPUT_ENA, base + CIF_MIPI_CTRL);
>> +	}
>> +	/* Activate ISP */
>> +	val = readl(base + CIF_ISP_CTRL);
>> +	val |= CIF_ISP_CTRL_ISP_CFG_UPD | CIF_ISP_CTRL_ISP_ENABLE |
>> +	       CIF_ISP_CTRL_ISP_INFORM_ENABLE;
>> +	writel(val, base + CIF_ISP_CTRL);
>> +
>> +	/* XXX: Is the 1000us too long?
>> +	 * CIF spec says to wait for sufficient time after enabling
>> +	 * the MIPI interface and before starting the sensor output.
>> +	 */
>> +	usleep_range(1000, 1200);
>> +
>> +	v4l2_dbg(1, rkisp1_debug, &dev->v4l2_dev,
>> +		 "SP streaming = %d, MP streaming = %d MI_CTRL 0x%08x\n"
>> +		 "  ISP_CTRL 0x%08x MIPI_CTRL 0x%08x\n",
>> +		 dev->stream[RKISP1_STREAM_SP].streaming,
>> +		 dev->stream[RKISP1_STREAM_MP].streaming,
>> +		 readl(base + CIF_MI_CTRL),
>> +		 readl(base + CIF_ISP_CTRL),
>> +		 readl(base + CIF_MIPI_CTRL));
>> +
>> +	return 0;
>> +}
>> +
>> +static void rkisp1_config_clk(struct rkisp1_device *dev)
>> +{
>> +	u32 val = CIF_ICCL_ISP_CLK | CIF_ICCL_CP_CLK | CIF_ICCL_MRSZ_CLK |
>> +		  CIF_ICCL_SRSZ_CLK | CIF_ICCL_JPEG_CLK | CIF_ICCL_MI_CLK |
>> +		  CIF_ICCL_IE_CLK | CIF_ICCL_MIPI_CLK | CIF_ICCL_DCROP_CLK;
>> +
>> +	writel(val, dev->base_addr + CIF_ICCL);
>> +}
>> +
>> +/***************************** isp sub-devs *******************************/
>> +
>> +static const struct ispsd_in_fmt rkisp1_isp_input_formats[] = {
>> +	{
>> +		.mbus_code	= MEDIA_BUS_FMT_SBGGR10_1X10,
>> +		.fmt_type	= FMT_BAYER,
>> +		.mipi_dt	= CIF_CSI2_DT_RAW10,
>> +		.bayer_pat	= RAW_BGGR,
>> +		.bus_width	= 10,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SRGGB10_1X10,
>> +		.fmt_type	= FMT_BAYER,
>> +		.mipi_dt	= CIF_CSI2_DT_RAW10,
>> +		.bayer_pat	= RAW_RGGB,
>> +		.bus_width	= 10,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SGBRG10_1X10,
>> +		.fmt_type	= FMT_BAYER,
>> +		.mipi_dt	= CIF_CSI2_DT_RAW10,
>> +		.bayer_pat	= RAW_GBRG,
>> +		.bus_width	= 10,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SGRBG10_1X10,
>> +		.fmt_type	= FMT_BAYER,
>> +		.mipi_dt	= CIF_CSI2_DT_RAW10,
>> +		.bayer_pat	= RAW_GRBG,
>> +		.bus_width	= 10,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SRGGB12_1X12,
>> +		.fmt_type	= FMT_BAYER,
>> +		.mipi_dt	= CIF_CSI2_DT_RAW12,
>> +		.bayer_pat	= RAW_RGGB,
>> +		.bus_width	= 12,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SBGGR12_1X12,
> 
> Is there a reason why the 10-bit Bayer format start with BGGR while the
> 12-bit formats start with RGGB ? Not a big deal, just OCD kicking in :-)
> 
>> +		.fmt_type	= FMT_BAYER,
>> +		.mipi_dt	= CIF_CSI2_DT_RAW12,
>> +		.bayer_pat	= RAW_BGGR,
>> +		.bus_width	= 12,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SGBRG12_1X12,
>> +		.fmt_type	= FMT_BAYER,
>> +		.mipi_dt	= CIF_CSI2_DT_RAW12,
>> +		.bayer_pat	= RAW_GBRG,
>> +		.bus_width	= 12,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SGRBG12_1X12,
>> +		.fmt_type	= FMT_BAYER,
>> +		.mipi_dt	= CIF_CSI2_DT_RAW12,
>> +		.bayer_pat	= RAW_GRBG,
>> +		.bus_width	= 12,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SRGGB8_1X8,
>> +		.fmt_type	= FMT_BAYER,
>> +		.mipi_dt	= CIF_CSI2_DT_RAW8,
>> +		.bayer_pat	= RAW_RGGB,
>> +		.bus_width	= 8,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SBGGR8_1X8,
>> +		.fmt_type	= FMT_BAYER,
>> +		.mipi_dt	= CIF_CSI2_DT_RAW8,
>> +		.bayer_pat	= RAW_BGGR,
>> +		.bus_width	= 8,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SGBRG8_1X8,
>> +		.fmt_type	= FMT_BAYER,
>> +		.mipi_dt	= CIF_CSI2_DT_RAW8,
>> +		.bayer_pat	= RAW_GBRG,
>> +		.bus_width	= 8,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SGRBG8_1X8,
>> +		.fmt_type	= FMT_BAYER,
>> +		.mipi_dt	= CIF_CSI2_DT_RAW8,
>> +		.bayer_pat	= RAW_GRBG,
>> +		.bus_width	= 8,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_YUYV8_1X16,
>> +		.fmt_type	= FMT_YUV,
>> +		.mipi_dt	= CIF_CSI2_DT_YUV422_8b,
>> +		.yuv_seq	= CIF_ISP_ACQ_PROP_YCBYCR,
>> +		.bus_width	= 16,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_YVYU8_1X16,
>> +		.fmt_type	= FMT_YUV,
>> +		.mipi_dt	= CIF_CSI2_DT_YUV422_8b,
>> +		.yuv_seq	= CIF_ISP_ACQ_PROP_YCRYCB,
>> +		.bus_width	= 16,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_UYVY8_1X16,
>> +		.fmt_type	= FMT_YUV,
>> +		.mipi_dt	= CIF_CSI2_DT_YUV422_8b,
>> +		.yuv_seq	= CIF_ISP_ACQ_PROP_CBYCRY,
>> +		.bus_width	= 16,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_VYUY8_1X16,
>> +		.fmt_type	= FMT_YUV,
>> +		.mipi_dt	= CIF_CSI2_DT_YUV422_8b,
>> +		.yuv_seq	= CIF_ISP_ACQ_PROP_CRYCBY,
>> +		.bus_width	= 16,
>> +	},
>> +};
>> +
>> +static const struct ispsd_out_fmt rkisp1_isp_output_formats[] = {
>> +	{
>> +		.mbus_code	= MEDIA_BUS_FMT_YUYV8_2X8,
>> +		.fmt_type	= FMT_YUV,
>> +	}, {
> 
> This is the only entry not present in the previous table, so I'm
> wondering if it would make sense to merge the two tables and rename
> ispsd_in_fmt to rkisp1_format_info. You would need to add a field that
> tells, for each format, if it's valid as an input format, and output
> format, or both. Hmmmm and also make the enum logic a bit more complex.
> Maybe it's not worth it after all, but it bothers me a bit to have two
> tables :-) I'll let you decide what's best.
> 
>> +		.mbus_code	= MEDIA_BUS_FMT_SRGGB12_1X12,
>> +		.fmt_type	= FMT_BAYER,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SBGGR12_1X12,
>> +		.fmt_type	= FMT_BAYER,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SGBRG12_1X12,
>> +		.fmt_type	= FMT_BAYER,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SGRBG12_1X12,
>> +		.fmt_type	= FMT_BAYER,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SRGGB10_1X10,
>> +		.fmt_type	= FMT_BAYER,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SBGGR10_1X10,
>> +		.fmt_type	= FMT_BAYER,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SGBRG10_1X10,
>> +		.fmt_type	= FMT_BAYER,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SGRBG10_1X10,
>> +		.fmt_type	= FMT_BAYER,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SRGGB8_1X8,
>> +		.fmt_type	= FMT_BAYER,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SBGGR8_1X8,
>> +		.fmt_type	= FMT_BAYER,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SGBRG8_1X8,
>> +		.fmt_type	= FMT_BAYER,
>> +	}, {
>> +		.mbus_code	= MEDIA_BUS_FMT_SGRBG8_1X8,
>> +		.fmt_type	= FMT_BAYER,
>> +	},
>> +};
>> +
>> +static const struct ispsd_in_fmt *find_in_fmt(u32 mbus_code)
>> +{
>> +	unsigned int i, array_size = ARRAY_SIZE(rkisp1_isp_input_formats);
>> +	const struct ispsd_in_fmt *fmt;
> 
> You can move this variable inside the loop.
> 
>> +
>> +	for (i = 0; i < array_size; i++) {
> 
> I would remove the array_size local variable, it doesn't improve
> readability. Same for the next function.
> 
>> +		fmt = &rkisp1_isp_input_formats[i];
>> +		if (fmt->mbus_code == mbus_code)
>> +			return fmt;
>> +	}
>> +
>> +	return NULL;
>> +}
>> +
>> +static const struct ispsd_out_fmt *find_out_fmt(u32 mbus_code)
>> +{
>> +	unsigned int i, array_size = ARRAY_SIZE(rkisp1_isp_output_formats);
>> +	const struct ispsd_out_fmt *fmt;
>> +
>> +	for (i = 0; i < array_size; i++) {
>> +		fmt = &rkisp1_isp_output_formats[i];
>> +		if (fmt->mbus_code == mbus_code)
>> +			return fmt;
>> +	}
>> +
>> +	return NULL;
>> +}
>> +
>> +static int rkisp1_isp_sd_enum_mbus_code(struct v4l2_subdev *sd,
>> +					struct v4l2_subdev_pad_config *cfg,
>> +					struct v4l2_subdev_mbus_code_enum *code)
>> +{
>> +	unsigned int i = code->index;
>> +
>> +	if ((code->pad != RKISP1_ISP_PAD_SINK) &&
>> +	    (code->pad != RKISP1_ISP_PAD_SOURCE_PATH)) {
>> +		if (i > 0)
>> +			return -EINVAL;
>> +		code->code = MEDIA_BUS_FMT_FIXED;
>> +		return 0;
>> +	}
>> +
>> +	if (code->pad == RKISP1_ISP_PAD_SINK) {
>> +		if (i >= ARRAY_SIZE(rkisp1_isp_input_formats))
>> +			return -EINVAL;
>> +		code->code = rkisp1_isp_input_formats[i].mbus_code;
>> +	} else {
>> +		if (i >= ARRAY_SIZE(rkisp1_isp_output_formats))
>> +			return -EINVAL;
>> +		code->code = rkisp1_isp_output_formats[i].mbus_code;
>> +	}
> 
> On the other hand, merging the two tables above into one, you could
> merge the two branches here and only consider formats indicated as valid
> for to the pad you want. Maybe the code would be cleaner in the end.
> 
>> +
>> +	return 0;
>> +}
>> +
>> +static int rkisp1_isp_sd_init_config(struct v4l2_subdev *sd,
>> +				     struct v4l2_subdev_pad_config *cfg)
>> +{
>> +	struct v4l2_rect *mf_in_crop, *mf_out_crop;
>> +	struct v4l2_mbus_framefmt *mf_in, *mf_out;
>> +
>> +	mf_in = v4l2_subdev_get_try_format(sd, cfg, RKISP1_ISP_PAD_SINK);
>> +	mf_in->width = RKISP1_DEFAULT_WIDTH;
>> +	mf_in->height = RKISP1_DEFAULT_HEIGHT;
>> +	mf_in->field = V4L2_FIELD_NONE;
>> +	mf_in->code = rkisp1_isp_input_formats[0].mbus_code;
>> +
>> +	mf_in_crop = v4l2_subdev_get_try_crop(sd, cfg, RKISP1_ISP_PAD_SINK);
>> +	mf_in_crop->width = RKISP1_DEFAULT_WIDTH;
>> +	mf_in_crop->height = RKISP1_DEFAULT_HEIGHT;
>> +	mf_in_crop->left = 0;
>> +	mf_in_crop->top = 0;
>> +
>> +	mf_out = v4l2_subdev_get_try_format(sd, cfg,
>> +					    RKISP1_ISP_PAD_SOURCE_PATH);
>> +	*mf_out = *mf_in;
>> +	mf_out->code = rkisp1_isp_output_formats[0].mbus_code;
>> +	mf_out->quantization = V4L2_QUANTIZATION_FULL_RANGE;
>> +
>> +	mf_out_crop = v4l2_subdev_get_try_crop(sd, cfg,
>> +					       RKISP1_ISP_PAD_SOURCE_PATH);
>> +	*mf_out_crop = *mf_in_crop;
>> +
>> +	return 0;
>> +}
>> +
>> +static int rkisp1_isp_sd_get_fmt(struct v4l2_subdev *sd,
>> +				 struct v4l2_subdev_pad_config *cfg,
>> +				 struct v4l2_subdev_format *fmt)
>> +{
>> +	struct rkisp1_isp_subdev *isp_sd = sd_to_isp_sd(sd);
>> +	struct v4l2_mbus_framefmt *mf = &fmt->format;
>> +
>> +	if ((fmt->pad != RKISP1_ISP_PAD_SINK) &&
>> +	    (fmt->pad != RKISP1_ISP_PAD_SOURCE_PATH)) {
>> +		fmt->format.code = MEDIA_BUS_FMT_FIXED;
>> +		/*
>> +		 * NOTE: setting a format here doesn't make much sense
>> +		 * but v4l2-compliance complains
>> +		 */
> 
> For the params pad I agreed it makes no sense, and I think
> v4l2-compliance is at fault, so I'd set width and height to 0. For the
> stats pad we *could* use the size of the image from which stats are
> computed, but because v4l2_meta_format has no width/height, I think 0
> would also be appropriate.
> 
>> +		fmt->format.width = RKISP1_DEFAULT_WIDTH;
>> +		fmt->format.height = RKISP1_DEFAULT_HEIGHT;
>> +		fmt->format.field = V4L2_FIELD_NONE;
>> +		return 0;
>> +	}
>> +
>> +	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
>> +		mf = v4l2_subdev_get_try_format(sd, cfg, fmt->pad);
>> +		fmt->format = *mf;
>> +		return 0;
>> +	}
>> +
>> +	if (fmt->pad == RKISP1_ISP_PAD_SINK) {
>> +		*mf = isp_sd->in_frm;
>> +	} else if (fmt->pad == RKISP1_ISP_PAD_SOURCE_PATH) {
>> +		/* format of source pad */
>> +		*mf = isp_sd->in_frm;
>> +		mf->code = isp_sd->out_fmt.mbus_code;
>> +		/* window size of source pad */
>> +		mf->width = isp_sd->out_crop.width;
>> +		mf->height = isp_sd->out_crop.height;
>> +		mf->quantization = isp_sd->quantization;
>> +	}
>> +	mf->field = V4L2_FIELD_NONE;
> 
> This can be simplified, please read through, or jump to the review of
> rkisp1_isp_subdev at the end.
> 
>> +
>> +	return 0;
>> +}
>> +
>> +static void rkisp1_isp_sd_try_fmt(struct v4l2_subdev *sd,
>> +				  unsigned int pad,
>> +				  struct v4l2_mbus_framefmt *fmt)
>> +{
>> +	struct rkisp1_device *isp_dev = sd_to_isp_dev(sd);
>> +	struct rkisp1_isp_subdev *isp_sd = &isp_dev->isp_sdev;
>> +	const struct ispsd_out_fmt *out_fmt;
>> +	const struct ispsd_in_fmt *in_fmt;
>> +
>> +	switch (pad) {
>> +	case RKISP1_ISP_PAD_SINK:
>> +		in_fmt = find_in_fmt(fmt->code);
>> +		if (in_fmt)
>> +			fmt->code = in_fmt->mbus_code;
>> +		else
>> +			fmt->code = MEDIA_BUS_FMT_SRGGB10_1X10;
> 
> You write MEDIA_BUS_FMT_SRGGB10_1X10 explicitly here, while you use
> rkisp1_isp_output_formats[0].mbus_code below (and in other places). I
> would standardise on one of the two (explicit formats or array[0]), with
> a preference for the first as that would allow merging the input and
> output arrays more easily. I would then create two #define,
> RKISP1_DEF_INPUT_FORMAT and RKISP2_DEF_OUTPUT_FORMAT (or similar).
> Similar macros for the default width and height could also be useful, to
> make it easier to change them.
> 
>> +		fmt->width  = clamp_t(u32, fmt->width, CIF_ISP_INPUT_W_MIN,
>> +				      CIF_ISP_INPUT_W_MAX);
>> +		fmt->height = clamp_t(u32, fmt->height, CIF_ISP_INPUT_H_MIN,
>> +				      CIF_ISP_INPUT_H_MAX);
>> +		break;
>> +	case RKISP1_ISP_PAD_SOURCE_PATH:
>> +		out_fmt = find_out_fmt(fmt->code);
>> +		if (out_fmt)
>> +			fmt->code = out_fmt->mbus_code;
>> +		else
>> +			fmt->code = rkisp1_isp_output_formats[0].mbus_code;
>> +		/* window size is set in s_selection */
>> +		fmt->width  = isp_sd->out_crop.width;
>> +		fmt->height = isp_sd->out_crop.height;
> 
> This function operates on the TRY configuration too, in which case you
> should use the TRY crop rectangle here, not the ACTIVE one. If you've
> already jumped to the review of rkisp1_isp_subdev you know my proposal
> to simplify this. Otherwise now may be a good time to do so :-)
> 
>> +		/* full range by default */
>> +		if (!fmt->quantization)
>> +			fmt->quantization = V4L2_QUANTIZATION_FULL_RANGE;
>> +		break;
>> +	}
>> +
>> +	fmt->field = V4L2_FIELD_NONE;
>> +}
>> +
>> +static int rkisp1_isp_sd_set_fmt(struct v4l2_subdev *sd,
>> +				 struct v4l2_subdev_pad_config *cfg,
>> +				 struct v4l2_subdev_format *fmt)
>> +{
>> +	struct rkisp1_device *isp_dev = sd_to_isp_dev(sd);
>> +	struct rkisp1_isp_subdev *isp_sd = &isp_dev->isp_sdev;
>> +	struct v4l2_mbus_framefmt *mf = &fmt->format;
>> +
>> +	if ((fmt->pad != RKISP1_ISP_PAD_SINK) &&
>> +	    (fmt->pad != RKISP1_ISP_PAD_SOURCE_PATH))
>> +		return rkisp1_isp_sd_get_fmt(sd, cfg, fmt);
>> +
>> +	rkisp1_isp_sd_try_fmt(sd, fmt->pad, mf);
>> +
>> +	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
>> +		struct v4l2_mbus_framefmt *try_mf;
>> +
>> +		try_mf = v4l2_subdev_get_try_format(sd, cfg, fmt->pad);
>> +		*try_mf = *mf;
>> +		return 0;
> 
> When setting the format on the sink pad the crop rectangles need to be
> reset (here, and for the ACTIVE format below too).
> 
>> +	}
>> +
>> +	if (fmt->pad == RKISP1_ISP_PAD_SINK) {
>> +		const struct ispsd_in_fmt *in_fmt;
>> +
>> +		in_fmt = find_in_fmt(mf->code);
>> +		isp_sd->in_fmt = *in_fmt;
>> +		isp_sd->in_frm = *mf;
>> +	} else if (fmt->pad == RKISP1_ISP_PAD_SOURCE_PATH) {
>> +		const struct ispsd_out_fmt *out_fmt;
>> +
>> +		/* Ignore width/height */
>> +		out_fmt = find_out_fmt(mf->code);
>> +		isp_sd->out_fmt = *out_fmt;
> 
> I would return the in_fmt and out_fmt from rkisp1_isp_sd_try_fmt() as it
> already looks them up. If you merge the input and output tables, you'll
> have a single format info structure type, and rkisp1_isp_sd_try_fmt()
> could return the entry for the pad it operates on.
> 
>> +		/*
>> +		 * It is quantization for output,
>> +		 * isp use bt601 limit-range in internal
>> +		 */
>> +		isp_sd->quantization = mf->quantization;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static void rkisp1_isp_sd_try_crop(struct v4l2_subdev *sd,
>> +				  struct v4l2_subdev_pad_config *cfg,
>> +				  struct v4l2_subdev_selection *sel)
>> +{
>> +	struct rkisp1_isp_subdev *isp_sd = sd_to_isp_sd(sd);
>> +	struct v4l2_mbus_framefmt in_frm = isp_sd->in_frm;
>> +	struct v4l2_rect in_crop = isp_sd->in_crop;
>> +	struct v4l2_rect *input = &sel->r;
>> +
>> +	if (sel->which == V4L2_SUBDEV_FORMAT_TRY) {
>> +		in_frm = *v4l2_subdev_get_try_format(sd, cfg,
>> +						     RKISP1_ISP_PAD_SINK);
>> +		in_crop = *v4l2_subdev_get_try_crop(sd, cfg,
>> +						    RKISP1_ISP_PAD_SINK);
>> +	}
>> +
>> +	input->left = ALIGN(input->left, 2);
>> +	input->width = ALIGN(input->width, 2);
>> +
>> +	if (sel->pad == RKISP1_ISP_PAD_SINK) {
>> +		input->left = clamp_t(u32, input->left, 0, in_frm.width);
>> +		input->top = clamp_t(u32, input->top, 0, in_frm.height);
>> +		input->width = clamp_t(u32, input->width, CIF_ISP_INPUT_W_MIN,
>> +				       in_frm.width - input->left);
>> +		input->height = clamp_t(u32, input->height,
>> +					CIF_ISP_INPUT_H_MIN,
>> +					in_frm.height - input->top);
>> +	} else if (sel->pad == RKISP1_ISP_PAD_SOURCE_PATH) {
>> +		input->left = clamp_t(u32, input->left, 0, in_crop.width);
>> +		input->top = clamp_t(u32, input->top, 0, in_crop.height);
>> +		input->width = clamp_t(u32, input->width, CIF_ISP_OUTPUT_W_MIN,
>> +				       in_crop.width - input->left);
>> +		input->height = clamp_t(u32, input->height,
>> +					CIF_ISP_OUTPUT_H_MIN,
>> +					in_crop.height - input->top);
>> +	}
>> +}
>> +
>> +static int rkisp1_isp_sd_get_selection(struct v4l2_subdev *sd,
>> +				       struct v4l2_subdev_pad_config *cfg,
>> +				       struct v4l2_subdev_selection *sel)
>> +{
>> +	struct rkisp1_isp_subdev *isp_sd = sd_to_isp_sd(sd);
>> +	struct v4l2_mbus_framefmt *frm;
>> +	struct v4l2_rect *rect;
>> +
>> +	if (sel->pad != RKISP1_ISP_PAD_SOURCE_PATH &&
>> +	    sel->pad != RKISP1_ISP_PAD_SINK)
>> +		return -EINVAL;
>> +
>> +	switch (sel->target) {
>> +	case V4L2_SEL_TGT_CROP_BOUNDS:
>> +		if (sel->pad == RKISP1_ISP_PAD_SINK) {
>> +			if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
>> +				frm = v4l2_subdev_get_try_format(sd, cfg,
>> +								 sel->pad);
>> +			else
>> +				frm = &isp_sd->in_frm;
>> +
>> +			sel->r.height = frm->height;
>> +			sel->r.width = frm->width;
>> +			sel->r.left = 0;
>> +			sel->r.top = 0;
>> +		} else {
>> +			if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
>> +				rect = v4l2_subdev_get_try_crop(sd, cfg,
>> +							RKISP1_ISP_PAD_SINK);
>> +			else
>> +				rect = &isp_sd->in_crop;
>> +			sel->r = *rect;
>> +		}
>> +		break;
>> +	case V4L2_SEL_TGT_CROP:
>> +		if (sel->which == V4L2_SUBDEV_FORMAT_TRY)
>> +			rect = v4l2_subdev_get_try_crop(sd, cfg, sel->pad);
>> +		else if (sel->pad == RKISP1_ISP_PAD_SINK)
>> +			rect = &isp_sd->in_crop;
>> +		else
>> +			rect = &isp_sd->out_crop;
>> +		sel->r = *rect;
>> +		break;
>> +	default:
>> +		return -EINVAL;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int rkisp1_isp_sd_set_selection(struct v4l2_subdev *sd,
>> +				       struct v4l2_subdev_pad_config *cfg,
>> +				       struct v4l2_subdev_selection *sel)
>> +{
>> +	struct rkisp1_isp_subdev *isp_sd = sd_to_isp_sd(sd);
>> +	struct rkisp1_device *dev = sd_to_isp_dev(sd);
>> +
>> +	if (sel->pad != RKISP1_ISP_PAD_SOURCE_PATH &&
>> +	    sel->pad != RKISP1_ISP_PAD_SINK)
>> +		return -EINVAL;
>> +	if (sel->target != V4L2_SEL_TGT_CROP)
>> +		return -EINVAL;
>> +
>> +	v4l2_dbg(1, rkisp1_debug, &dev->v4l2_dev,
>> +		 "%s: pad: %d sel(%d,%d)/%dx%d\n", __func__, sel->pad,
>> +		 sel->r.left, sel->r.top, sel->r.width, sel->r.height);
>> +	rkisp1_isp_sd_try_crop(sd, cfg, sel);
>> +
>> +	if (sel->which == V4L2_SUBDEV_FORMAT_TRY) {
>> +		struct v4l2_rect *try_sel =
>> +			v4l2_subdev_get_try_crop(sd, cfg, sel->pad);
>> +
>> +		*try_sel = sel->r;
>> +		return 0;
> 
> When setting the crop rectangle on the sink pad the rectangle on the
> source pad should be reset (and below for the ACTIVE format too).
> 
> The resizer logic, through selection rectangles, seems to be missing. I
> assume it's configured through the video nodes, but that's not correct
> I'm afraid, scaling should be configured on subdevs, see [1]. I'm afraid
> this means that we'll need separate subdevs for the resizers :-S
> 
> [1] https://linuxtv.org/downloads/v4l-dvb-apis/uapi/v4l/dev-subdev.html#order-of-configuration-and-format-propagation
> 
>> +	}
>> +
>> +	if (sel->pad == RKISP1_ISP_PAD_SINK)
>> +		isp_sd->in_crop = sel->r;
>> +	else
>> +		isp_sd->out_crop = sel->r;
>> +
>> +	return 0;
>> +}
>> +
> 
> I'll skip the part related to power on/off below as Sakari requested it
> to be handled through runtime PM.
> 
>> +static int mipi_csi2_s_stream_start(struct rkisp1_isp_subdev *isp_sd,
>> +				    struct rkisp1_sensor *sensor)
>> +{
>> +	union phy_configure_opts opts = { 0 };
>> +	struct phy_configure_opts_mipi_dphy *cfg = &opts.mipi_dphy;
>> +	struct v4l2_ctrl *pixel_rate;
>> +	s64 pixel_clock;
>> +
>> +	pixel_rate = v4l2_ctrl_find(sensor->sd->ctrl_handler,
>> +				    V4L2_CID_PIXEL_RATE);
>> +	if (!pixel_rate) {
>> +		v4l2_warn(sensor->sd, "No pixel rate control in subdev\n");
>> +		return -EPIPE;
>> +	}
> 
> Would it make sense to retrieve (and cache) the control pointer (not its
> value of course) at probe time already ?
> 
>> +
>> +	pixel_clock = v4l2_ctrl_g_ctrl_int64(pixel_rate);
>> +	if (!pixel_clock) {
>> +		v4l2_err(sensor->sd, "Invalid pixel rate value\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	phy_mipi_dphy_get_default_config(pixel_clock, isp_sd->in_fmt.bus_width,
>> +					 sensor->lanes, cfg);
>> +	phy_set_mode(sensor->dphy, PHY_MODE_MIPI_DPHY);
>> +	phy_configure(sensor->dphy, &opts);
>> +	phy_power_on(sensor->dphy);
>> +
>> +	return 0;
>> +}
>> +
>> +static void mipi_csi2_s_stream_stop(struct rkisp1_sensor *sensor)
>> +{
>> +	phy_power_off(sensor->dphy);
>> +}
>> +
>> +static int rkisp1_isp_sd_s_stream(struct v4l2_subdev *sd, int on)
>> +{
>> +	struct rkisp1_device *isp_dev = sd_to_isp_dev(sd);
>> +	struct v4l2_subdev *sensor_sd;
>> +	int ret = 0;
>> +
>> +	if (!on) {
>> +		ret = rkisp1_isp_stop(isp_dev);
>> +		if (ret < 0)
>> +			return ret;
>> +		mipi_csi2_s_stream_stop(isp_dev->active_sensor);
>> +		return 0;
>> +	}
>> +
>> +	sensor_sd = get_remote_sensor(sd);
>> +	if (!sensor_sd)
>> +		return -ENODEV;
>> +
>> +	isp_dev->active_sensor = sd_to_sensor(isp_dev, sensor_sd);
>> +	if (!isp_dev->active_sensor)
>> +		return -ENODEV;
>> +
>> +	atomic_set(&isp_dev->isp_sdev.frm_sync_seq, 0);
>> +	ret = rkisp1_config_cif(isp_dev);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	/* TODO: support other interfaces */
>> +	if (isp_dev->active_sensor->mbus.type != V4L2_MBUS_CSI2_DPHY)
>> +		return -EINVAL;
>> +
>> +	ret = mipi_csi2_s_stream_start(&isp_dev->isp_sdev,
>> +				       isp_dev->active_sensor);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	ret = rkisp1_isp_start(isp_dev);
>> +	if (ret)
>> +		mipi_csi2_s_stream_stop(isp_dev->active_sensor);
>> +
>> +	return ret;
>> +}
>> +
>> +static int rkisp1_isp_sd_s_power(struct v4l2_subdev *sd, int on)
>> +{
>> +	struct rkisp1_device *isp_dev = sd_to_isp_dev(sd);
>> +	int ret;
>> +
>> +	v4l2_dbg(1, rkisp1_debug, &isp_dev->v4l2_dev, "s_power: %d\n", on);
>> +
>> +	if (on) {
>> +		ret = pm_runtime_get_sync(isp_dev->dev);
>> +		if (ret < 0)
>> +			return ret;
>> +
>> +		rkisp1_config_clk(isp_dev);
>> +	} else {
>> +		ret = pm_runtime_put(isp_dev->dev);
>> +		if (ret < 0)
>> +			return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int rkisp1_subdev_link_validate(struct media_link *link)
>> +{
>> +	if (link->source->index == RKISP1_ISP_PAD_SINK_PARAMS)
>> +		return 0;
>> +
>> +	return v4l2_subdev_link_validate(link);
>> +}
>> +
>> +static int rkisp1_subdev_fmt_link_validate(struct v4l2_subdev *sd,
>> +					struct media_link *link,
>> +					struct v4l2_subdev_format *source_fmt,
>> +					struct v4l2_subdev_format *sink_fmt)
>> +{
>> +	if (source_fmt->format.code != sink_fmt->format.code)
>> +		return -EINVAL;
>> +
>> +	/* Crop is available */
>> +	if (source_fmt->format.width < sink_fmt->format.width ||
>> +	    source_fmt->format.height < sink_fmt->format.height)
>> +		return -EINVAL;
> 
> Crop should be handled on pads, not on links. The size at the ends of
> the link should match. This will likely require a bit of a redesign of
> the format and selection rectangles handling, but I think it's also an
> opportunity to simplify the code.
> 
>> +
>> +	return 0;
>> +}
>> +
>> +static void rkisp1_isp_queue_event_sof(struct rkisp1_isp_subdev *isp)
>> +{
>> +	struct v4l2_event event = {
>> +		.type = V4L2_EVENT_FRAME_SYNC,
>> +		.u.frame_sync.frame_sequence =
>> +			atomic_inc_return(&isp->frm_sync_seq) - 1,
> 
> I would move the increment to the caller, hiding it in this function is
> error-prone (and if you look at the caller I'm pointing out one possible
> error :-)).
> 
> In general usage of frm_sync_seq through the driver seems to be very
> race-prone. It's read in various IRQ handling functions, all coming from
> the same IRQ, so that part is fine (and wouldn't require an atomic
> variable), but when read from the buffer queue handlers I really get a
> red light flashing in my head. I'll try to investigate more when
> reviewing the next patches.

I see that the only place were 'frame_sequence' is read outside of the irq
handlers is in the capture in 'rkisp1_vb2_buf_queue':

	/*
          * If there's no next buffer assigned, queue this buffer directly
          * as the next buffer, and update the memory interface.
          */
         if (cap->is_streaming && !cap->buf.next &&
             atomic_read(&cap->rkisp1->isp.frame_sequence) == -1) {
                 cap->buf.next = ispbuf;
                 rkisp1_set_next_buf(cap);
         } else {
                 list_add_tail(&ispbuf->queue, &cap->buf.queue);
         }
This "if" condition seems very specific, a case where we already stream but v-start was not yet received.
I think it is possible to remove the test 'atomic_read(&cap->rkisp1->isp.frame_sequence) == -1'
from the above condition so that the next buffer is updated in case it is null not just before the first
v-start signal.

> 
>> +	};
>> +	v4l2_event_queue(isp->sd.devnode, &event);
>> +}
>> +
>> +static int rkisp1_isp_sd_subs_evt(struct v4l2_subdev *sd, struct v4l2_fh *fh,
>> +				  struct v4l2_event_subscription *sub)
>> +{
>> +	if (sub->type != V4L2_EVENT_FRAME_SYNC)
>> +		return -EINVAL;
>> +
>> +	/* Line number. For now only zero accepted. */
> 
> Is the id a line number for V4L2_EVENT_FRAME_SYNC ? It's not mentioned
> for V4L2_EVENT_FRAME_SYNC in the V4L2 spec, so I think this check is
> correct, but the comment doesn't seem to be.
> 
>> +	if (sub->id != 0)
>> +		return -EINVAL;
>> +
>> +	return v4l2_event_subscribe(fh, sub, 0, NULL);
>> +}
>> +
>> +static const struct v4l2_subdev_pad_ops rkisp1_isp_sd_pad_ops = {
>> +	.enum_mbus_code = rkisp1_isp_sd_enum_mbus_code,
>> +	.get_selection = rkisp1_isp_sd_get_selection,
>> +	.set_selection = rkisp1_isp_sd_set_selection,
>> +	.init_cfg = rkisp1_isp_sd_init_config,
>> +	.get_fmt = rkisp1_isp_sd_get_fmt,
>> +	.set_fmt = rkisp1_isp_sd_set_fmt,
>> +	.link_validate = rkisp1_subdev_fmt_link_validate,
>> +};
>> +
>> +static const struct media_entity_operations rkisp1_isp_sd_media_ops = {
>> +	.link_validate = rkisp1_subdev_link_validate,
>> +};
>> +
>> +static const struct v4l2_subdev_video_ops rkisp1_isp_sd_video_ops = {
>> +	.s_stream = rkisp1_isp_sd_s_stream,
>> +};
>> +
>> +static const struct v4l2_subdev_core_ops rkisp1_isp_core_ops = {
>> +	.subscribe_event = rkisp1_isp_sd_subs_evt,
>> +	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
>> +	.s_power = rkisp1_isp_sd_s_power,
>> +};
>> +
>> +static struct v4l2_subdev_ops rkisp1_isp_sd_ops = {
> 
> static const
> 
>> +	.core = &rkisp1_isp_core_ops,
>> +	.video = &rkisp1_isp_sd_video_ops,
>> +	.pad = &rkisp1_isp_sd_pad_ops,
>> +};
>> +
>> +static void rkisp1_isp_sd_init_default_fmt(struct rkisp1_isp_subdev *isp_sd)
>> +{
>> +	struct v4l2_mbus_framefmt *in_frm = &isp_sd->in_frm;
>> +	struct v4l2_rect *in_crop = &isp_sd->in_crop;
>> +	struct v4l2_rect *out_crop = &isp_sd->out_crop;
>> +	struct ispsd_in_fmt *in_fmt = &isp_sd->in_fmt;
>> +	struct ispsd_out_fmt *out_fmt = &isp_sd->out_fmt;
>> +
>> +	*in_fmt = rkisp1_isp_input_formats[0];
>> +	in_frm->width = RKISP1_DEFAULT_WIDTH;
>> +	in_frm->height = RKISP1_DEFAULT_HEIGHT;
>> +	in_frm->code = in_fmt->mbus_code;
>> +
>> +	in_crop->width = in_frm->width;
>> +	in_crop->height = in_frm->height;
>> +	in_crop->left = 0;
>> +	in_crop->top = 0;
>> +
>> +	/* propagate to source */
>> +	*out_crop = *in_crop;
>> +	*out_fmt = rkisp1_isp_output_formats[0];
>> +	isp_sd->quantization = V4L2_QUANTIZATION_FULL_RANGE;
> 
> I wonder, could this be implemented by sharing code with .init_cfg() if
> you store the active configuration in v4l2_subdev_pad_config instances
> (please see the comments about the rkisp1_isp_subdev structure below) ?
> 
>> +}
>> +
>> +int rkisp1_register_isp_subdev(struct rkisp1_device *isp_dev,
>> +			       struct v4l2_device *v4l2_dev)
>> +{
>> +	struct rkisp1_isp_subdev *isp_sdev = &isp_dev->isp_sdev;
>> +	struct v4l2_subdev *sd = &isp_sdev->sd;
>> +	int ret;
>> +
>> +	v4l2_subdev_init(sd, &rkisp1_isp_sd_ops);
>> +	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
>> +	sd->entity.ops = &rkisp1_isp_sd_media_ops;
>> +	snprintf(sd->name, sizeof(sd->name), "rkisp1-isp-subdev");
>> +
>> +	isp_sdev->pads[RKISP1_ISP_PAD_SINK].flags =
>> +		MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
>> +	isp_sdev->pads[RKISP1_ISP_PAD_SINK_PARAMS].flags = MEDIA_PAD_FL_SINK;
>> +	isp_sdev->pads[RKISP1_ISP_PAD_SOURCE_PATH].flags = MEDIA_PAD_FL_SOURCE;
>> +	isp_sdev->pads[RKISP1_ISP_PAD_SOURCE_STATS].flags = MEDIA_PAD_FL_SOURCE;
>> +	sd->entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER;
>> +	ret = media_entity_pads_init(&sd->entity, RKISP1_ISP_PAD_MAX,
>> +				     isp_sdev->pads);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	sd->owner = THIS_MODULE;
>> +	v4l2_set_subdevdata(sd, isp_dev);
>> +
>> +	sd->grp_id = GRP_ID_ISP;
> 
> I think you can drop this, as well as all the GRP_ID_* macros, they're
> not used.
> 
>> +	ret = v4l2_device_register_subdev(v4l2_dev, sd);
>> +	if (ret < 0) {
>> +		v4l2_err(sd, "Failed to register isp subdev\n");
>> +		goto err_cleanup_media_entity;
>> +	}
>> +
>> +	rkisp1_isp_sd_init_default_fmt(isp_sdev);
>> +
>> +	return 0;
>> +err_cleanup_media_entity:
>> +	media_entity_cleanup(&sd->entity);
>> +	return ret;
>> +}
>> +
>> +void rkisp1_unregister_isp_subdev(struct rkisp1_device *isp_dev)
>> +{
>> +	struct v4l2_subdev *sd = &isp_dev->isp_sdev.sd;
>> +
>> +	v4l2_device_unregister_subdev(sd);
>> +	media_entity_cleanup(&sd->entity);
>> +}
>> +
>> +/****************  Interrupter Handler ****************/
> 
> s/Handler/Handlers/
> 
>> +
>> +void rkisp1_mipi_isr(unsigned int mis, struct rkisp1_device *dev)
> 
> I would make the mis field an u32 as it contains register values. Should
> it also be renamed to status ? Same for rkisp1_isp_isr() below.
> 
>> +{
>> +	struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
>> +	void __iomem *base = dev->base_addr;
>> +	u32 val;
>> +
> 
> How about moving the CIF_MIPI_MIS read here and removing the mis
> argument to the function ? It would be more logical to group all
> register access related to interrupts in a single place. Same for the
> other interrupt handler functions.
> 
>> +	writel(~0, base + CIF_MIPI_ICR);
>> +
>> +	/*
>> +	 * Disable DPHY errctrl interrupt, because this dphy
>> +	 * erctrl signal is asserted until the next changes
>> +	 * of line state. This time is may be too long and cpu
>> +	 * is hold in this interrupt.
>> +	 */
>> +	if (mis & CIF_MIPI_ERR_CTRL(0x0f)) {
>> +		val = readl(base + CIF_MIPI_IMSC);
>> +		writel(val & ~CIF_MIPI_ERR_CTRL(0x0f), base + CIF_MIPI_IMSC);
>> +		dev->isp_sdev.dphy_errctrl_disabled = true;
>> +	}
>> +
>> +	/*
>> +	 * Enable DPHY errctrl interrupt again, if mipi have receive
>> +	 * the whole frame without any error.
>> +	 */
>> +	if (mis == CIF_MIPI_FRAME_END) {
>> +		/*
>> +		 * Enable DPHY errctrl interrupt again, if mipi have receive
>> +		 * the whole frame without any error.
>> +		 */
>> +		if (dev->isp_sdev.dphy_errctrl_disabled) {
>> +			val = readl(base + CIF_MIPI_IMSC);
>> +			val |= CIF_MIPI_ERR_CTRL(0x0f);
>> +			writel(val, base + CIF_MIPI_IMSC);
>> +			dev->isp_sdev.dphy_errctrl_disabled = false;
>> +		}
>> +	} else {
>> +		v4l2_warn(v4l2_dev, "MIPI mis error: 0x%08x\n", mis);
>> +	}
>> +}
>> +
>> +void rkisp1_isp_isr(unsigned int isp_mis, struct rkisp1_device *dev)
>> +{
>> +	void __iomem *base = dev->base_addr;
>> +	unsigned int isp_mis_tmp = 0;
> 
> _tmp are never good names :-S
> 
>> +	unsigned int isp_err = 0;
> 
> Neither of these variable need to be initialised to 0.
> 
>> +
>> +	/* start edge of v_sync */
>> +	if (isp_mis & CIF_ISP_V_START) {
>> +		rkisp1_isp_queue_event_sof(&dev->isp_sdev);
> 
> This will increment the frame sequence number. What if the interrupt is
> slightly delayed and the next frame starts before we get a change to
> copy the sequence number to the buffers (before they will complete
> below) ?

Do you mean that we get two sequental v-start signals and then the next
frame-end signal in MI_MIS belongs to the first v-start signal of the two?
How can this be solved? I wonder if any v-start signal has a later signal
that correspond to the same frame so that we can follow it?

Maybe we should have one counter that is incremented on v-start signal,
and another counter that is incremented uppon some other signal?

> 
>> +
>> +		writel(CIF_ISP_V_START, base + CIF_ISP_ICR);
> 
> Do you need to clear all interrupt bits individually, can't you write
> isp_mis to CIF_ISP_ICR at the beginning of the function to clear them
> all in one go ?
> 
>> +		isp_mis_tmp = readl(base + CIF_ISP_MIS);
>> +		if (isp_mis_tmp & CIF_ISP_V_START)
>> +			v4l2_err(&dev->v4l2_dev, "isp icr v_statr err: 0x%x\n",
>> +				 isp_mis_tmp);
> 
> This require some explanation. It looks like a naive way to protect
> against something, but I think it could trigger under normal
> circumstances if IRQ handling is delayed, and wouldn't do much anyway.
> Same for the similar constructs below.
> 
>> +	}
>> +
>> +	if ((isp_mis & CIF_ISP_PIC_SIZE_ERROR)) {
>> +		/* Clear pic_size_error */
>> +		writel(CIF_ISP_PIC_SIZE_ERROR, base + CIF_ISP_ICR);
>> +		isp_err = readl(base + CIF_ISP_ERR);
>> +		v4l2_err(&dev->v4l2_dev,
>> +			 "CIF_ISP_PIC_SIZE_ERROR (0x%08x)", isp_err);
> 
> What does this mean ?
> 
>> +		writel(isp_err, base + CIF_ISP_ERR_CLR);
>> +	} else if ((isp_mis & CIF_ISP_DATA_LOSS)) {
> 
> Are CIF_ISP_PIC_SIZE_ERROR and CIF_ISP_DATA_LOSS mutually exclusive ?
> 
>> +		/* Clear data_loss */
>> +		writel(CIF_ISP_DATA_LOSS, base + CIF_ISP_ICR);
>> +		v4l2_err(&dev->v4l2_dev, "CIF_ISP_DATA_LOSS\n");
>> +		writel(CIF_ISP_DATA_LOSS, base + CIF_ISP_ICR);
>> +	}
>> +
>> +	/* sampled input frame is complete */
>> +	if (isp_mis & CIF_ISP_FRAME_IN) {
>> +		writel(CIF_ISP_FRAME_IN, base + CIF_ISP_ICR);
>> +		isp_mis_tmp = readl(base + CIF_ISP_MIS);
>> +		if (isp_mis_tmp & CIF_ISP_FRAME_IN)
>> +			v4l2_err(&dev->v4l2_dev, "isp icr frame_in err: 0x%x\n",
>> +				 isp_mis_tmp);
>> +	}
>> +
>> +	/* frame was completely put out */
> 
> "put out" ? :-) What's the difference between ISP_FRAME_IN and ISP_FRAME
> ? The two comments could do with a bit of brush up, and I think the
> ISP_FRAME_IN interrupt could be disabled as it doesn't perform any
> action.

Those two oneline comments are just copy-paste from the datasheet.

""
5 MIS_FRAME_IN sampled input frame is complete
1 MIS_FRAME frame was completely put out
""

Unfrotunately, the datasheet does not add any further explanation about those signals.

> 
>> +	if (isp_mis & CIF_ISP_FRAME) {
>> +		u32 isp_ris = 0;
> 
> No need to initialise this to 0.
> 
>> +		/* Clear Frame In (ISP) */
>> +		writel(CIF_ISP_FRAME, base + CIF_ISP_ICR);
>> +		isp_mis_tmp = readl(base + CIF_ISP_MIS);
>> +		if (isp_mis_tmp & CIF_ISP_FRAME)
>> +			v4l2_err(&dev->v4l2_dev,
>> +				 "isp icr frame end err: 0x%x\n", isp_mis_tmp);
>> +
>> +		isp_ris = readl(base + CIF_ISP_RIS);
>> +		if (isp_ris & (CIF_ISP_AWB_DONE | CIF_ISP_AFM_FIN |
>> +			       CIF_ISP_EXP_END | CIF_ISP_HIST_MEASURE_RDY))
>> +			rkisp1_stats_isr(&dev->stats_vdev, isp_ris);
> 
> Is there a guarantee that the statistics will be fully written out
> before the video frame itself ? And doesn't this test if any of the
> statistics is complete, not all of them ? I think the logic is wrong, it

The datasheet does not add any explanation of what is expected to come first.
Should we wait until all statistics measurements are done? In the struct
sent to userspace there is a bitmaks for which of the statistics are read.
I think that if only part of the statistics are ready, we can already send the once
that are ready to userspace.

> seems it should be moved out of the CIF_ISP_FRAME test, to a test of its
> own. It's hard to tell for sure without extra information though (for
> instance why are the stats-related bits read from CIF_ISP_RIS, when
> they seem to be documented as valid in CIF_ISP_ISR), but this should be
> validated, and most probably fixed. Care should be taken to keep
> synchronisation of sequence number between the different queues.

I see that the capture buffers are done before incrementing the frame_sequence with
the following explanation:

	/*
          * Call rkisp1_capture_isr() first to handle the frame that
          * potentially completed using the current frame_sequence number before
          * it is potentially incremented by rkisp1_isp_isr() in the vertical
          * sync.
          */

I think reading the stats/params should also be done before calling rkisp1_capture_isr
for the same reason. (so to match the correct frame_sequence)

Thanks,
Dafna

> 
>> +	}
>> +
>> +	/*
>> +	 * Then update changed configs. Some of them involve
>> +	 * lot of register writes. Do those only one per frame.
>> +	 * Do the updates in the order of the processing flow.
>> +	 */
>> +	rkisp1_params_isr(&dev->params_vdev, isp_mis);
> 
> You should pass dev to this function, and use it internally for the I/O
> accessors instead of going through the vdev.
> 
>> +}
>> diff --git a/drivers/media/platform/rockchip/isp1/rkisp1.h b/drivers/media/platform/rockchip/isp1/rkisp1.h
>> new file mode 100644
>> index 000000000000..b0366e354ec2
>> --- /dev/null
>> +++ b/drivers/media/platform/rockchip/isp1/rkisp1.h
>> @@ -0,0 +1,111 @@
>> +/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
>> +/*
>> + * Rockchip isp1 driver
>> + *
>> + * Copyright (C) 2017 Rockchip Electronics Co., Ltd.
>> + */
>> +
>> +#ifndef _RKISP1_H
>> +#define _RKISP1_H
>> +
>> +#include <linux/platform_device.h>
>> +#include <media/v4l2-fwnode.h>
> 
> I don't think you need these headers. You however need
> 
> #include <media/v4l2-ctrls.h>
> #include <media/v4l2-subdev.h>
> 
> to make this header self-contained. Other headers could be added too
> (videodev2.h, v4l2-mediabus.h and media-entity.h), they're included
> through the above two headers at the moment.
> 
>> +
>> +#include "common.h"
>> +
>> +struct rkisp1_stream;
>> +
>> +/*
>> + * struct ispsd_in_fmt - ISP intput-pad format
>> + *
>> + * Translate mbus_code to hardware format values
>> + *
>> + * @bus_width: used for parallel
>> + */
>> +struct ispsd_in_fmt {
>> +	u32 mbus_code;
>> +	u8 fmt_type;
>> +	u32 mipi_dt;
>> +	u32 yuv_seq;
>> +	enum rkisp1_fmt_raw_pat_type bayer_pat;
>> +	u8 bus_width;
>> +};
> 
> Some of the structures are prefixed with ispsd_, some with rkisp1_. I
> think we should standardise on a single prefix.
> 
>> +
>> +struct ispsd_out_fmt {
>> +	u32 mbus_code;
>> +	u8 fmt_type;
>> +};
>> +
>> +struct rkisp1_ie_config {
>> +	unsigned int effect;
>> +};
> 
> This structure isn't used.
> 
>> +
>> +enum rkisp1_isp_pad {
>> +	RKISP1_ISP_PAD_SINK,
> 
> Should this be named SINK_VIDEO to match SINK_PARAMS ?
> 
>> +	RKISP1_ISP_PAD_SINK_PARAMS,
>> +	RKISP1_ISP_PAD_SOURCE_PATH,
> 
> And SOURCE_VIDEO ?
> 
>> +	RKISP1_ISP_PAD_SOURCE_STATS,
>> +	RKISP1_ISP_PAD_MAX
>> +};
>> +
>> +/*
>> + * struct rkisp1_isp_subdev - ISP sub-device
>> + *
>> + * See Cropping regions of ISP in rkisp1.c for details
> 
> Could you please document all fields from the structure ?
> 
>> + * @in_frm: input size, don't have to be equal to sensor size
>> + * @in_fmt: input format
>> + * @in_crop: crop for sink pad
>> + * @out_fmt: output format
>> + * @out_crop: output size
>> + *
>> + * @dphy_errctrl_disabled: if dphy errctrl is disabled(avoid endless interrupt)
> 
> s/disabled/disabled /
> 
>> + * @frm_sync_seq: frame sequence, to sync frame_id between video devices.
>> + * @quantization: output quantization
>> + */
>> +struct rkisp1_isp_subdev {
>> +	struct v4l2_subdev sd;
>> +	struct media_pad pads[RKISP1_ISP_PAD_MAX];
>> +	struct v4l2_ctrl_handler ctrl_handler;
>> +	struct v4l2_mbus_framefmt in_frm;
>> +	struct ispsd_in_fmt in_fmt;
> 
> I think this (and out_fmt) could be stored as pointers.
> 
>> +	struct v4l2_rect in_crop;
>> +	struct ispsd_out_fmt out_fmt;
>> +	struct v4l2_rect out_crop;
> 
> I think this could be greatly simplified if you stored all the data as
> v4l2_subdev_pad_config instances for both the sink and source video pads
> instead of using ad-hoc structures. In particular your get and set
> format handlers would become much simpler. I recommend looking at the
> mt9p031 sensor driver for an example. In a nutshell, the get handler
> would retrieve the format from the v4l2_subdev_pad_config instance
> either from rkisp1_isp_subdev (for V4L2_SUBDEV_FORMAT_ACTIVE) or from
> the passed cfg argument (for V4L2_SUBDEV_FORMAT_TRY). The set handler
> would operate similarly, with just a test one ACTIVE/TRY at the
> beginning, followed by common code that only operates on the cfg, and
> finally storing the format in rkisp1_isp_subdev for
> V4L2_SUBDEV_FORMAT_ACTIVE.
> 
>> +	bool dphy_errctrl_disabled;
>> +	atomic_t frm_sync_seq;
>> +	enum v4l2_quantization quantization;
> 
> The quantization would then be stored in the v4l2_subdev_pad_config too.
> 
>> +};
>> +
>> +int rkisp1_register_isp_subdev(struct rkisp1_device *isp_dev,
>> +			       struct v4l2_device *v4l2_dev);
>> +
>> +void rkisp1_unregister_isp_subdev(struct rkisp1_device *isp_dev);
>> +
>> +void rkisp1_mipi_isr(unsigned int mipi_mis, struct rkisp1_device *dev);
>> +
>> +void rkisp1_isp_isr(unsigned int isp_mis, struct rkisp1_device *dev);
>> +
>> +static inline
>> +struct ispsd_out_fmt *rkisp1_get_ispsd_out_fmt(struct rkisp1_isp_subdev *isp_sdev)
>> +{
>> +	return &isp_sdev->out_fmt;
>> +}
>> +
>> +static inline
>> +struct ispsd_in_fmt *rkisp1_get_ispsd_in_fmt(struct rkisp1_isp_subdev *isp_sdev)
>> +{
>> +	return &isp_sdev->in_fmt;
>> +}
>> +
>> +static inline
>> +struct v4l2_rect *rkisp1_get_isp_sd_win(struct rkisp1_isp_subdev *isp_sdev)
>> +{
>> +	return &isp_sdev->out_crop;
>> +}
> 
> I agree with Sakari that accessing fields directly would be more
> readable.
> 
>> +
>> +static inline struct rkisp1_isp_subdev *sd_to_isp_sd(struct v4l2_subdev *sd)
>> +{
>> +	return container_of(sd, struct rkisp1_isp_subdev, sd);
>> +}
>> +
>> +#endif /* _RKISP1_H */
> 

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