Message-ID: 
 <OSZPR01MB9427AA10698873917CD3A76892C62@OSZPR01MB9427.jpnprd01.prod.outlook.com>
Date: Mon, 10 Jun 2024 23:54:58 +0000
From: <yuji2.ishikawa@...hiba.co.jp>
To: <hverkuil@...all.nl>, <laurent.pinchart@...asonboard.com>,
        <mchehab@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <rafael.j.wysocki@...el.com>,
        <nobuhiro1.iwamatsu@...hiba.co.jp>
CC: <linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v10 4/6] media: platform: visconti: add streaming
 interface for ISP parameters and status

Hello Hans,

Thank you for your review.

> -----Original Message-----
> From: Hans Verkuil <hverkuil@...all.nl>
> Sent: Friday, May 31, 2024 8:00 PM
> To: ishikawa yuji(石川 悠司 ○ＲＤＣ□ＡＩＴＣ○ＥＡ開)
> <yuji2.ishikawa@...hiba.co.jp>; Laurent Pinchart
> <laurent.pinchart@...asonboard.com>; Mauro Carvalho Chehab
> <mchehab@...nel.org>; Rob Herring <robh@...nel.org>; Krzysztof Kozlowski
> <krzk+dt@...nel.org>; Conor Dooley <conor+dt@...nel.org>; Rafael J .
> Wysocki <rafael.j.wysocki@...el.com>; iwamatsu nobuhiro(岩松 信洋 ○ＤＩ
> ＴＣ□ＤＩＴ○ＯＳＴ) <nobuhiro1.iwamatsu@...hiba.co.jp>
> Cc: linux-media@...r.kernel.org; devicetree@...r.kernel.org;
> linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v10 4/6] media: platform: visconti: add streaming
> interface for ISP parameters and status
> 
> Hi Yuji,
> 
> Some small comments:
> 
> On 24/04/2024 04:42, Yuji Ishikawa wrote:
> > Add support to Image Signal Processors of Visconti's Video Input Interface.
> > This patch adds two streaming interfaces; one for passing parameters
> > to the signal processor, the other for receiving status.
> >
> > Signed-off-by: Yuji Ishikawa <yuji2.ishikawa@...hiba.co.jp>
> > ---
> > Changelog v2:
> > - Resend v1 because a patch exceeds size limit.
> >
> > Changelog v3:
> > - Adapted to media control framework
> > - Introduced ISP subdevice, capture device
> > - Remove private IOCTLs and add vendor specific V4L2 controls
> > - Change function name avoiding camelcase and uppercase letters
> >
> > Changelog v4:
> > - Split patches because the v3 patch exceeds size limit
> > - Stop using ID number to identify driver instance:
> >   - Use dynamically allocated structure to hold HW specific context,
> >     instead of static one.
> >   - Call HW layer functions with the context structure instead of ID
> > number
> >
> > Changelog v5:
> > - no change
> >
> > Changelog v6:
> > - remove unused macros
> > - removed hwd_ and HWD_ prefix
> > - update source code documentation
> > - Suggestion from Hans Verkuil
> >   - pointer to userland memory is removed from uAPI arguments
> >     - style of structure is now "nested" instead of "chained by pointer";
> >   - use div64_u64 for 64bit division
> >   - vendor specific controls support TRY_EXT_CTRLS
> >   - add READ_ONLY flag to GET_CALIBRATION_STATUS control and similar
> ones
> >   - human friendry control names for vendor specific controls
> >   - add initial value to each vendor specific control
> >   - GET_LAST_CAPTURE_STATUS control is updated asyncnously from
> workqueue
> >   - remove EXECUTE_ON_WRITE flag of vendor specific control
> >   - uAPI: return value of GET_CALIBRATION_STATUS follows common rules
> of error codes
> >   - applied v4l2-compliance
> > - Suggestion from Sakari Ailus
> >   - use div64_u64 for 64bit division
> >   - update copyright's year
> >   - remove redandunt cast
> >   - use bool instead of HWD_VIIF_ENABLE/DISABLE
> >   - simplify comparison to 0
> >   - simplify statements with trigram operator
> >   - remove redundant local variables
> >   - use general integer types instead of u32/s32
> > - Suggestion from Laurent Pinchart
> >   - moved VIIF driver to driver/platform/toshiba/visconti
> >   - change register access: struct-style to macro-style
> >   - remove unused type definitions
> >   - define enums instead of successive macro constants
> >   - remove redundant parenthesis of macro constant
> >   - embed struct hwd_res into struct viif_device
> >   - use xxx_dma instead of xxx_paddr for variable names of IOVA
> >   - literal value: just 0 instead of 0x0
> >   - use literal 1 or 0 instead of HWD_VIIF_ENABLE, DISABLE for register
> access
> >   - use true or false instead of HWD_VIIF_ENABLE, DISABLE for function
> calls
> >   - uAPI: return value of GET_CALIBRATION_STATUS follows common rules
> > of error codes
> >
> > Changelog v7:
> > - remove unused variables
> > - split long statements which have multiple logical-OR and trigram
> > operators
> >
> > Changelog v8:
> > - define constant V4L2_CTRL_TYPE_VISCONTI_ISP for datatype
> >   of Visconti specific controls
> > - Suggestion from Hans Verkuil
> >   - remove pr_info()
> >   - use pm_runtime_get_if_in_use() to get power status
> >
> > Changelog v9:
> > - fix warning for cast between ptr and dma_addr_t
> >
> > Changelog v10:
> > - use parameter buffer instead of vendor specific compound controls
> >   - add viif_params interface for passing ISP parameters
> >   - add viif_stats interface for passing ISP status
> > - remove parameter validation routine; moved to userland library
> >
> >  .../media/platform/toshiba/visconti/Makefile  |    2 +-
> >  .../media/platform/toshiba/visconti/viif.c    |   28 +-
> >  .../platform/toshiba/visconti/viif_isp.c      |    7 +
> >  .../platform/toshiba/visconti/viif_params.c   | 2026
> +++++++++++++++++
> >  .../platform/toshiba/visconti/viif_params.h   |   19 +
> >  .../platform/toshiba/visconti/viif_stats.c    |  334 +++
> >  .../platform/toshiba/visconti/viif_stats.h    |   14 +
> >  7 files changed, 2427 insertions(+), 3 deletions(-)  create mode
> > 100644 drivers/media/platform/toshiba/visconti/viif_params.c
> >  create mode 100644
> > drivers/media/platform/toshiba/visconti/viif_params.h
> >  create mode 100644
> > drivers/media/platform/toshiba/visconti/viif_stats.c
> >  create mode 100644
> > drivers/media/platform/toshiba/visconti/viif_stats.h
> >
> 
> <snip>
> 
> > diff --git a/drivers/media/platform/toshiba/visconti/viif_params.c
> > b/drivers/media/platform/toshiba/visconti/viif_params.c
> > new file mode 100644
> > index 0000000000..5170d371c2
> > --- /dev/null
> > +++ b/drivers/media/platform/toshiba/visconti/viif_params.c
> > @@ -0,0 +1,2026 @@
> 
> <snip>
> 
> > +static const struct viif_l1_hdrc_config
> > +	defval_l1_set_hdrc = { .enable = 1,
> > +			       .param = {
> > +				       .hdrc_ratio = 0x0E +
> VIIF_L1_HDRC_RATIO_OFFSET,
> > +				       .hdrc_pt_ratio = 7,
> > +				       .hdrc_pt_sat = 0xFFC0,
> > +				       .hdrc_tn_type = 1,
> > +			       } };
> 
> Strange layout, can you write this like almost all other structs?
> 
> static const struct viif_l1_hdrc_config defval_l1_set_hdrc = {
> 	.enable = 1,
>         .param = {
> 	       .hdrc_ratio = 0x0E + VIIF_L1_HDRC_RATIO_OFFSET,
> 	       .hdrc_pt_ratio = 7,
> 	       .hdrc_pt_sat = 0xFFC0,
> 	       .hdrc_tn_type = 1,
> 	}
> };
> 

I'll fix this strange layout as well as others.
Also I'll check settings of clang-format.

> > +
> > +static const struct viif_l1_hdrc_ltm_config defval_l1_set_hdrc_ltm = {
> > +	.tnp_max = 0x3FFFFF,
> > +	.tnp_mag = 0x40,
> > +	.tnp_fil = { 0x88, 0x84, 0x7A, 0x6A, 0x54 }, };
> > +
> > +static const struct viif_l1_gamma_config defval_l1_set_gamma = {
> > +	.enable = 1,
> > +	.param = {
> > +		.gam_p = {
> > +			0x02F, 0x01B, 0x02A, 0x023, 0x020, 0x037, 0x031,
> 0x057, 0x04D, 0x088,
> > +			0x078, 0x0D6, 0x0BD, 0x14F, 0x12A, 0x20D, 0x1D3,
> 0x1AB, 0x18D, 0x2DC,
> > +			0x29E, 0x271, 0x47C, 0x41B, 0x3D4, 0x70A, 0x672,
> 0x601, 0xB0C, 0xA1D,
> > +			0x96C, 0x8E2, 0x874, 0xFDD, 0xEC9, 0xDF2, 0xD42,
> 0xCB1, 0xC35, 0xBC9,
> > +			0xB6A, 0xB16, 0xACB, 0xA86},
> > +		.blkadj = 0x1000,
> > +	},
> > +};
> > +
> > +static const struct viif_l1_img_quality_adjustment_config
> defval_l1_set_img_quality_adjustment = {
> > +	.enable = 0,
> > +	.coef_cb = 0x9078,
> > +	.coef_cr = 0xB699,
> > +	.brightness = 0,
> > +	.linear_contrast = 128,
> > +};
> > +
> > +static const struct viif_l1_avg_lum_generation_config
> defval_l1_set_avg_lum_generation = {
> > +	.enable = 0
> > +};
> > +
> > +static const struct viif_l2_undist_config defval_l2_set_undist = { .param = {
> > +
> 	   .through_mode = 1,
> > +
> 	   .roi_mode = { 0, 0 },
> > +
> 	   .grid_node_num_h = 0x10,
> > +
> 	   .grid_node_num_v = 0x10,
> > +								   } };
> 
> Another weird layout.
> 

I'll fix the layout.

> > +
> > +static const struct viif_l2_roi_config defval_l2_set_roi = {
> > +	.roi_num = 1,
> > +	.roi_scale = { 65536, 65536 },
> > +	.roi_scale_inv = { 65536, 65536 },
> > +	.corrected_wo_scale_hsize = { 0x80, 0x80 },
> > +	.corrected_hsize = { 0x80, 0x80 },
> > +	.corrected_wo_scale_vsize = { 0x80, 0x80 },
> > +	.corrected_vsize = { 0x80, 0x80 },
> > +};
> > +
> > +static const struct viif_l2_gamma_config defval_l2_set_gamma = { 0 };
> > +
> > +static void viif_apply_default_parameter(struct viif_device
> > +*viif_dev) {
> > +	viif_l1_set_input_mode(viif_dev, &defval_l1_set_input_mode);
> > +	viif_l1_set_rgb_to_y_coef(viif_dev, &defval_l1_set_rgb_to_y_coef);
> > +	viif_l1_set_ag_mode(viif_dev, &defval_l1_set_ag_mode);
> > +	viif_l1_set_ag(viif_dev, &defval_l1_set_ag);
> > +	viif_l1_set_hdre(viif_dev, &defval_l1_set_hdre);
> > +	viif_l1_set_img_extraction(viif_dev, &defval_l1_set_img_extraction);
> > +	viif_l1_set_dpc(viif_dev, &defval_l1_set_dpc);
> > +	viif_l1_set_preset_white_balance(viif_dev,
> &defval_l1_set_preset_white_balance);
> > +	viif_l1_set_raw_color_noise_reduction(viif_dev,
> &defval_l1_set_raw_color_noise_reduction);
> > +	viif_l1_set_hdrs(viif_dev, &defval_l1_set_hdrs);
> > +	viif_l1_set_black_level_correction(viif_dev,
> &defval_l1_set_black_level_correction);
> > +	viif_l1_set_lsc(viif_dev, &defval_l1_set_lsc);
> > +	viif_l1_set_main_process(viif_dev, &defval_l1_set_main_process);
> > +	viif_l1_set_awb(viif_dev, &defval_l1_set_awb);
> > +	viif_l1_lock_awb_gain(viif_dev, &defval_l1_lock_awb_gain);
> > +	viif_l1_set_hdrc(viif_dev, &defval_l1_set_hdrc);
> > +	viif_l1_set_hdrc_ltm(viif_dev, &defval_l1_set_hdrc_ltm);
> > +	viif_l1_set_gamma(viif_dev, &defval_l1_set_gamma);
> > +	viif_l1_set_img_quality_adjustment(viif_dev,
> &defval_l1_set_img_quality_adjustment);
> > +	viif_l1_set_avg_lum_generation(viif_dev,
> &defval_l1_set_avg_lum_generation);
> > +	viif_l2_set_undist(viif_dev, &defval_l2_set_undist);
> > +	viif_l2_set_roi_wrap(viif_dev, &defval_l2_set_roi);
> > +	viif_l2_set_gamma(viif_dev, CAPTURE_PATH_MAIN_POST0,
> &defval_l2_set_gamma);
> > +	viif_l2_set_gamma(viif_dev, CAPTURE_PATH_MAIN_POST1,
> > +&defval_l2_set_gamma); }
> > +
> >
> +/*===============================================
> ====================
> > +====*/
> > +/* parameter buffer streaming interface */
> >
> +/*===============================================
> ====================
> > +====*/
> > +struct viif_buffer {
> > +	struct vb2_v4l2_buffer vb;
> > +	struct list_head queue;
> > +};
> > +
> > +static bool viif_params_get_buffer(struct params_dev *params_dev, struct
> viif_buffer **buf,
> > +				   struct visconti_viif_isp_config **cfg) {
> > +	if (list_empty(&params_dev->params_queue))
> > +		return false;
> > +
> > +	*buf = list_first_entry(&params_dev->params_queue, struct
> viif_buffer, queue);
> > +	*cfg = vb2_plane_vaddr(&(*buf)->vb.vb2_buf, 0);
> > +
> > +	return true;
> > +}
> > +
> > +static int viif_apply_queued_parameter(struct viif_device *viif_dev,
> > +bool initial_cfg) {
> > +	struct params_dev *params_dev = &viif_dev->params_dev;
> > +	struct visconti_viif_isp_config *new_params;
> > +	struct viif_buffer *cur_buf;
> > +	int ret = 0;
> > +
> > +	spin_lock(&params_dev->params_lock);
> > +
> > +	if (!viif_params_get_buffer(params_dev, &cur_buf, &new_params)) {
> > +		ret = 1;
> > +		goto unlock;
> > +	}
> > +
> > +	/* evaluate new_params */
> > +	if (initial_cfg) {
> > +		if (new_params->update_cfg &
> VISCONTI_VIIF_CFG_ISP_L1_INPUT_MODE)
> > +			viif_l1_set_input_mode(viif_dev,
> &new_params->l1_input_mode);
> > +	}
> > +	if (new_params->update_cfg &
> VISCONTI_VIIF_CFG_ISP_L1_RGB_TO_Y_COEF)
> > +		viif_l1_set_rgb_to_y_coef(viif_dev,
> &new_params->l1_rgb_to_y_coef);
> > +	if (new_params->update_cfg &
> VISCONTI_VIIF_CFG_ISP_L1_AG_MODE)
> > +		viif_l1_set_ag_mode(viif_dev, &new_params->l1_ag_mode);
> > +	if (new_params->update_cfg & VISCONTI_VIIF_CFG_ISP_L1_AG)
> > +		viif_l1_set_ag(viif_dev, &new_params->l1_ag);
> > +	if (new_params->update_cfg & VISCONTI_VIIF_CFG_ISP_L1_HDRE)
> > +		viif_l1_set_hdre(viif_dev, &new_params->l1_hdre);
> > +	if (new_params->update_cfg &
> VISCONTI_VIIF_CFG_ISP_L1_IMG_EXTRACTION)
> > +		viif_l1_set_img_extraction(viif_dev,
> &new_params->l1_img_extraction);
> > +	if (new_params->update_cfg & VISCONTI_VIIF_CFG_ISP_L1_DPC)
> > +		viif_l1_set_dpc(viif_dev, &new_params->l1_dpc);
> > +	if (new_params->update_cfg &
> VISCONTI_VIIF_CFG_ISP_L1_PRESET_WHITE_BALANCE)
> > +		viif_l1_set_preset_white_balance(viif_dev,
> &new_params->l1_preset_white_balance);
> > +	if (new_params->update_cfg &
> VISCONTI_VIIF_CFG_ISP_L1_RAW_COLOR_NOISE_REDUCTION)
> > +		viif_l1_set_raw_color_noise_reduction(viif_dev,
> > +
> &new_params->l1_raw_color_noise_reduction);
> > +	if (new_params->update_cfg & VISCONTI_VIIF_CFG_ISP_L1_HDRS)
> > +		viif_l1_set_hdrs(viif_dev, &new_params->l1_hdrs);
> > +	if (new_params->update_cfg &
> VISCONTI_VIIF_CFG_ISP_L1_BLACK_LEVEL_CORRECTION)
> > +		viif_l1_set_black_level_correction(viif_dev,
> > +
> &new_params->l1_black_level_correction);
> > +	if (new_params->update_cfg & VISCONTI_VIIF_CFG_ISP_L1_LSC)
> > +		viif_l1_set_lsc(viif_dev, &new_params->l1_lsc);
> > +	if (new_params->update_cfg &
> VISCONTI_VIIF_CFG_ISP_L1_MAIN_PROCESS)
> > +		viif_l1_set_main_process(viif_dev,
> &new_params->l1_main_process);
> > +	if (new_params->update_cfg & VISCONTI_VIIF_CFG_ISP_L1_AWB)
> > +		viif_l1_set_awb(viif_dev, &new_params->l1_awb);
> > +	if (new_params->update_cfg &
> VISCONTI_VIIF_CFG_ISP_L1_LOCK_AWB_GAIN)
> > +		viif_l1_lock_awb_gain(viif_dev,
> &new_params->lock_awb_gain);
> > +	if (new_params->update_cfg & VISCONTI_VIIF_CFG_ISP_L1_HDRC)
> > +		viif_l1_set_hdrc(viif_dev, &new_params->l1_hdrc);
> > +	if (new_params->update_cfg &
> VISCONTI_VIIF_CFG_ISP_L1_HDRC_LTM)
> > +		viif_l1_set_hdrc_ltm(viif_dev, &new_params->l1_hdrc_ltm);
> > +	if (new_params->update_cfg & VISCONTI_VIIF_CFG_ISP_L1_GAMMA)
> > +		viif_l1_set_gamma(viif_dev, &new_params->l1_gamma);
> > +	if (new_params->update_cfg &
> VISCONTI_VIIF_CFG_ISP_L1_IMG_QUALITY_ADJUSTMENT)
> > +		viif_l1_set_img_quality_adjustment(viif_dev,
> > +
> &new_params->l1_img_quality_adjustment);
> > +	if (new_params->update_cfg &
> VISCONTI_VIIF_CFG_ISP_L1_AVG_LUM_GENERATION)
> > +		viif_l1_set_avg_lum_generation(viif_dev,
> &new_params->l1_avg_lum_generation);
> > +	if (new_params->update_cfg & VISCONTI_VIIF_CFG_ISP_L2_UNDIST)
> > +		viif_l2_set_undist(viif_dev, &new_params->l2_undist);
> > +	if (new_params->update_cfg & VISCONTI_VIIF_CFG_ISP_L2_ROI)
> > +		viif_l2_set_roi_wrap(viif_dev, &new_params->l2_roi);
> > +	if (new_params->update_cfg &
> VISCONTI_VIIF_CFG_ISP_L2_GAMMA_POST0)
> > +		viif_l2_set_gamma(viif_dev, CAPTURE_PATH_MAIN_POST0,
> &new_params->l2_gamma_post0);
> > +	if (new_params->update_cfg &
> VISCONTI_VIIF_CFG_ISP_L2_GAMMA_POST1)
> > +		viif_l2_set_gamma(viif_dev, CAPTURE_PATH_MAIN_POST1,
> > +&new_params->l2_gamma_post1);
> > +
> > +	/* release buffer */
> > +	list_del(&cur_buf->queue);
> > +	cur_buf->vb.sequence = 0;
> > +	vb2_buffer_done(&cur_buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
> > +
> > +unlock:
> > +	spin_unlock(&params_dev->params_lock);
> > +	return ret;
> > +}
> > +
> > +void visconti_viif_params_isr(struct viif_device *viif_dev) {
> > +	viif_apply_queued_parameter(viif_dev, false); }
> > +
> > +void visconti_viif_params_eval_queue(struct viif_device *viif_dev) {
> > +	if (viif_apply_queued_parameter(viif_dev, true))
> > +		viif_apply_default_parameter(viif_dev);
> > +}
> > +
> > +static int viif_params_enum_fmt_meta_out(struct file *file, void
> > +*priv, struct v4l2_fmtdesc *f) {
> > +	struct video_device *vdev = video_devdata(file);
> > +
> > +	if (f->index > 0 || f->type != vdev->queue->type)
> > +		return -EINVAL;
> > +
> > +	f->pixelformat = V4L2_META_FMT_VISCONTI_VIIF_PARAMS;
> > +
> > +	return 0;
> > +}
> > +
> > +static int viif_params_g_fmt_meta_out(struct file *file, void *fh,
> > +struct v4l2_format *f) {
> > +	struct video_device *vdev = video_devdata(file);
> > +	struct v4l2_meta_format *meta = &f->fmt.meta;
> > +
> > +	if (f->type != vdev->queue->type)
> > +		return -EINVAL;
> > +
> > +	memset(meta, 0, sizeof(*meta));
> > +	meta->dataformat = V4L2_META_FMT_VISCONTI_VIIF_PARAMS;
> > +	meta->buffersize = sizeof(struct visconti_viif_isp_config);
> > +
> > +	return 0;
> > +}
> > +
> > +static int viif_params_querycap(struct file *file, void *priv, struct
> > +v4l2_capability *cap) {
> > +	struct video_device *vdev = video_devdata(file);
> > +
> > +	strscpy(cap->driver, VIIF_DRIVER_NAME, sizeof(cap->driver));
> > +	strscpy(cap->card, vdev->name, sizeof(cap->card));
> > +	strscpy(cap->bus_info, VIIF_BUS_INFO_BASE "-0",
> > +sizeof(cap->bus_info));
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct v4l2_ioctl_ops viif_params_ioctl = {
> > +	.vidioc_reqbufs = vb2_ioctl_reqbufs,
> > +	.vidioc_querybuf = vb2_ioctl_querybuf,
> > +	.vidioc_create_bufs = vb2_ioctl_create_bufs,
> > +	.vidioc_qbuf = vb2_ioctl_qbuf,
> > +	.vidioc_dqbuf = vb2_ioctl_dqbuf,
> > +	.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
> > +	.vidioc_expbuf = vb2_ioctl_expbuf,
> > +	.vidioc_streamon = vb2_ioctl_streamon,
> > +	.vidioc_streamoff = vb2_ioctl_streamoff,
> > +	.vidioc_enum_fmt_meta_out = viif_params_enum_fmt_meta_out,
> > +	.vidioc_g_fmt_meta_out = viif_params_g_fmt_meta_out,
> > +	.vidioc_s_fmt_meta_out = viif_params_g_fmt_meta_out,
> > +	.vidioc_try_fmt_meta_out = viif_params_g_fmt_meta_out,
> > +	.vidioc_querycap = viif_params_querycap,
> > +	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
> > +	.vidioc_unsubscribe_event = v4l2_event_unsubscribe, };
> > +
> > +static const struct v4l2_file_operations viif_params_fops = { .mmap =
> vb2_fop_mmap,
> > +
> 	      .unlocked_ioctl = video_ioctl2,
> > +							      .poll =
> vb2_fop_poll,
> > +							      .open =
> v4l2_fh_open,
> > +							      .release =
> vb2_fop_release };
> 
> Weird layout.
> 

I'll fix the layout.

> > +
> > +static int viif_params_vb2_queue_setup(struct vb2_queue *q, unsigned int
> *num_buffers,
> > +				       unsigned int *num_planes, unsigned
> int sizes[],
> > +				       struct device *alloc_devs[]) {
> > +	*num_buffers = clamp_t(u32, *num_buffers, 2, 8);
> > +	*num_planes = 1;
> > +	sizes[0] = sizeof(struct visconti_viif_isp_config);
> > +	return 0;
> > +}
> > +
> > +static inline struct viif_buffer *vb2_to_viif(struct vb2_v4l2_buffer
> > +*vbuf) {
> > +	return container_of(vbuf, struct viif_buffer, vb); }
> > +
> > +static inline struct params_dev *vb2queue_to_paramsdev(struct
> > +vb2_queue *vq) {
> > +	return (struct params_dev *)vb2_get_drv_priv(vq); }
> > +
> > +static void viif_params_vb2_buf_queue(struct vb2_buffer *vb) {
> > +	struct params_dev *params_dev =
> vb2queue_to_paramsdev(vb->vb2_queue);
> > +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> > +	struct viif_buffer *buf = vb2_to_viif(vbuf);
> > +
> > +	spin_lock_irq(&params_dev->params_lock);
> > +	list_add_tail(&buf->queue, &params_dev->params_queue);
> > +	spin_unlock_irq(&params_dev->params_lock);
> > +}
> > +
> > +static int viif_params_vb2_buf_prepare(struct vb2_buffer *vb) {
> > +	if (vb2_plane_size(vb, 0) < sizeof(struct visconti_viif_isp_config))
> > +		return -EINVAL;
> > +
> > +	vb2_set_plane_payload(vb, 0, sizeof(struct visconti_viif_isp_config));
> > +	return 0;
> > +}
> > +
> > +static int viif_params_vb2_start_streaming(struct vb2_queue *q,
> > +unsigned int arg) {
> > +	return 0;
> > +}
> > +
> > +static void viif_params_vb2_stop_streaming(struct vb2_queue *q) {
> > +	struct params_dev *params_dev = vb2queue_to_paramsdev(q);
> > +	struct viif_buffer *buf;
> > +	LIST_HEAD(tmp_list);
> > +
> > +	spin_lock_irq(&params_dev->params_lock);
> > +	list_splice_init(&params_dev->params_queue, &tmp_list);
> > +	spin_unlock_irq(&params_dev->params_lock);
> > +
> > +	list_for_each_entry(buf, &tmp_list, queue)
> > +		vb2_buffer_done(&buf->vb.vb2_buf,
> VB2_BUF_STATE_ERROR); }
> > +
> > +static const struct vb2_ops viif_params_vb2_ops = {
> > +	.queue_setup = viif_params_vb2_queue_setup,
> > +	.wait_prepare = vb2_ops_wait_prepare,
> > +	.wait_finish = vb2_ops_wait_finish,
> > +	.buf_queue = viif_params_vb2_buf_queue,
> > +	.buf_prepare = viif_params_vb2_buf_prepare,
> > +	.start_streaming = viif_params_vb2_start_streaming,
> > +	.stop_streaming = viif_params_vb2_stop_streaming, };
> > +
> > +int visconti_viif_params_register(struct viif_device *viif_dev) {
> > +	struct params_dev *params_dev = &viif_dev->params_dev;
> > +	struct video_device *vdev = &params_dev->vdev;
> > +	struct vb2_queue *q = &params_dev->vb2_vq;
> > +	int ret;
> > +
> > +	mutex_init(&params_dev->vlock);
> > +	INIT_LIST_HEAD(&params_dev->params_queue);
> > +	spin_lock_init(&params_dev->params_lock);
> > +
> > +	strscpy(vdev->name, "viif_params", sizeof(vdev->name));
> > +
> > +	/* Register the video device */
> > +	video_set_drvdata(vdev, params_dev);
> > +	vdev->ioctl_ops = &viif_params_ioctl;
> > +	vdev->fops = &viif_params_fops;
> > +	vdev->release = video_device_release_empty;
> > +	vdev->lock = &params_dev->vlock;
> > +	vdev->v4l2_dev = &viif_dev->v4l2_dev;
> > +	vdev->queue = &params_dev->vb2_vq;
> > +	vdev->device_caps = V4L2_CAP_STREAMING |
> V4L2_CAP_META_OUTPUT;
> > +	vdev->vfl_dir = VFL_DIR_TX;
> > +
> > +	/* Initialize vb2 queue */
> > +	q->type = V4L2_BUF_TYPE_META_OUTPUT;
> > +	q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
> 
> Why do you want to support VB2_USERPTR? While not officially deprecated,
> we do discourage it for new drivers.
> 

I'll remove VB2_USERPTR.
We do not have specific usecase of this flag for our driver.

> > +	q->drv_priv = params_dev;
> > +	q->ops = &viif_params_vb2_ops;
> > +	q->mem_ops = &vb2_vmalloc_memops;
> > +	q->buf_struct_size = sizeof(struct viif_buffer);
> > +	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
> > +	q->lock = &params_dev->vlock;
> > +	q->dev = viif_dev->v4l2_dev.dev;
> > +
> > +	ret = vb2_queue_init(q);
> > +	if (ret)
> > +		return ret;
> > +
> > +	params_dev->params_pad.flags = MEDIA_PAD_FL_SOURCE;
> > +	ret = media_entity_pads_init(&vdev->entity, VIIF_PARAMS_PAD_NUM,
> &params_dev->params_pad);
> > +	if (ret)
> > +		goto error;
> > +
> > +	ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
> > +	if (ret) {
> > +		dev_err(viif_dev->v4l2_dev.dev, "video_register_device
> failed: %d\n", ret);
> > +		goto error;
> > +	}
> > +
> > +	return 0;
> > +
> > +error:
> > +	media_entity_cleanup(&vdev->entity);
> > +	mutex_destroy(&params_dev->vlock);
> > +
> > +	return ret;
> > +}
> > +
> > +void visconti_viif_params_unregister(struct viif_device *viif_dev) {
> > +	struct params_dev *params = &viif_dev->params_dev;
> > +	struct video_device *vdev = &params->vdev;
> > +
> > +	if (!video_is_registered(vdev))
> > +		return;
> > +
> > +	vb2_video_unregister_device(vdev);
> > +	media_entity_cleanup(&vdev->entity);
> > +	mutex_destroy(&params->vlock);
> > +}
> 
> <snip>
> 
> > diff --git a/drivers/media/platform/toshiba/visconti/viif_stats.c
> > b/drivers/media/platform/toshiba/visconti/viif_stats.c
> > new file mode 100644
> > index 0000000000..28cd879b5f
> > --- /dev/null
> > +++ b/drivers/media/platform/toshiba/visconti/viif_stats.c
> > @@ -0,0 +1,334 @@
> > +// SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
> > +/* Toshiba Visconti Video Capture Support
> > + *
> > + * (C) Copyright 2023 TOSHIBA CORPORATION
> > + * (C) Copyright 2023 Toshiba Electronic Devices & Storage
> > +Corporation  */
> > +
> > +#include <linux/delay.h>
> > +#include <linux/pm_runtime.h>
> > +#include <media/v4l2-common.h>
> > +#include <media/v4l2-subdev.h>
> > +#include <media/videobuf2-vmalloc.h>
> > +
> > +#include "viif.h"
> > +#include "viif_csi2rx.h"
> > +#include "viif_isp.h"
> > +#include "viif_common.h"
> > +#include "viif_regs.h"
> > +#include "viif_stats.h"
> > +
> > +struct viif_buffer {
> > +	struct vb2_v4l2_buffer vb;
> > +	struct list_head queue;
> > +};
> > +
> > +static void read_isp_capture_regs(struct viif_l1_info *l1_info,
> > +struct viif_device *viif_dev) {
> > +	unsigned long irqflags;
> > +	int i, j;
> > +	u32 val;
> > +
> > +	spin_lock_irqsave(&viif_dev->regbuf_lock, irqflags);
> > +	hwd_viif_isp_guard_start(viif_dev);
> > +
> > +	/* change register buffer to regbuf0 where driver gets information */
> > +	viif_capture_write(viif_dev, REG_L1_CRGBF_ACC_CONF,
> > +VAL_L1_CRGBF_ACC_CONF_MODE_BUFFER0);
> > +
> > +	/* get AWB info */
> > +	l1_info->awb_ave_u = viif_capture_read(viif_dev,
> REG_L1_AWHB_AVE_USIG);
> > +	l1_info->awb_ave_v = viif_capture_read(viif_dev,
> REG_L1_AWHB_AVE_VSIG);
> > +	l1_info->awb_accumulated_pixel = viif_capture_read(viif_dev,
> REG_L1_AWHB_NUM_UVON);
> > +	l1_info->awb_gain_r = viif_capture_read(viif_dev,
> REG_L1_AWHB_AWBGAINR);
> > +	l1_info->awb_gain_g = viif_capture_read(viif_dev,
> REG_L1_AWHB_AWBGAING);
> > +	l1_info->awb_gain_b = viif_capture_read(viif_dev,
> REG_L1_AWHB_AWBGAINB);
> > +	val = viif_capture_read(viif_dev, REG_L1_AWHB_R_CTR_STOP);
> > +	l1_info->awb_status_u = (FIELD_GET(BIT(1), val) != 0);
> > +	l1_info->awb_status_v = (FIELD_GET(BIT(0), val) != 0);
> > +
> > +	/* get average luminance info */
> > +	l1_info->avg_lum_weight = viif_capture_read(viif_dev,
> REG_L1_AEXP_RESULT_AVE);
> > +	val = viif_capture_read(viif_dev,
> REG_L1_AEXP_SATUR_BLACK_PIXNUM);
> > +	l1_info->avg_satur_pixnum = FIELD_GET(GENMASK(31, 16), val);
> > +	l1_info->avg_black_pixnum = FIELD_GET(GENMASK(15, 0), val);
> > +	for (i = 0; i < 8; i++) {
> > +		for (j = 0; j < 8; j++) {
> > +			l1_info->avg_lum_block[i][j] =
> > +				viif_capture_read(viif_dev,
> REG_L1_AEXP_AVE(i, j));
> > +		}
> > +	}
> > +	l1_info->avg_lum_four_line_lum[0] = viif_capture_read(viif_dev,
> REG_L1_AEXP_AVE4LINES0);
> > +	l1_info->avg_lum_four_line_lum[1] = viif_capture_read(viif_dev,
> REG_L1_AEXP_AVE4LINES1);
> > +	l1_info->avg_lum_four_line_lum[2] = viif_capture_read(viif_dev,
> REG_L1_AEXP_AVE4LINES2);
> > +	l1_info->avg_lum_four_line_lum[3] = viif_capture_read(viif_dev,
> > +REG_L1_AEXP_AVE4LINES3);
> > +
> > +	/* revert to register access from register buffer access */
> > +	viif_capture_write(viif_dev, REG_L1_CRGBF_ACC_CONF,
> > +VAL_L1_CRGBF_ACC_CONF_MODE_BYPASS);
> > +
> > +	hwd_viif_isp_guard_end(viif_dev);
> > +	spin_unlock_irqrestore(&viif_dev->regbuf_lock, irqflags); }
> > +
> > +static const struct viif_csi2rx_dphy_calibration_status
> calib_status_not_streaming = {
> > +	.term_cal_with_rext = -EAGAIN,
> > +	.clock_lane_offset_cal = -EAGAIN,
> > +	.data_lane0_offset_cal = -EAGAIN,
> > +	.data_lane1_offset_cal = -EAGAIN,
> > +	.data_lane2_offset_cal = -EAGAIN,
> > +	.data_lane3_offset_cal = -EAGAIN,
> > +	.data_lane0_ddl_tuning_cal = -EAGAIN,
> > +	.data_lane1_ddl_tuning_cal = -EAGAIN,
> > +	.data_lane2_ddl_tuning_cal = -EAGAIN,
> > +	.data_lane3_ddl_tuning_cal = -EAGAIN, };
> > +
> > +static const struct viif_csi2rx_err_status csi_err_not_streaming;
> > +
> > +void visconti_viif_stats_isr(struct viif_device *viif_dev, unsigned
> > +int sequence, u64 timestamp) {
> > +	struct visconti_viif_isp_stat *cur_stat_buf;
> > +	struct stats_dev *stats_dev = &viif_dev->stats_dev;
> > +	struct viif_buffer *cur_buf;
> > +
> > +	spin_lock(&stats_dev->stats_lock);
> > +
> > +	if (list_empty(&stats_dev->stats_queue))
> > +		goto done;
> > +
> > +	cur_buf = list_first_entry(&stats_dev->stats_queue, struct viif_buffer,
> queue);
> > +	list_del(&cur_buf->queue);
> > +	cur_stat_buf = (struct visconti_viif_isp_stat
> > +*)vb2_plane_vaddr(&cur_buf->vb.vb2_buf, 0);
> > +
> > +	if (!vb2_start_streaming_called(&viif_dev->cap_dev0.vb2_vq)) {
> > +		cur_stat_buf->csi2rx_dphy_calibration =
> calib_status_not_streaming;
> > +	} else {
> > +		visconti_viif_csi2rx_get_calibration_status(viif_dev,
> > +
> &cur_stat_buf->csi2rx_dphy_calibration);
> > +	}
> > +
> > +	if (!vb2_is_streaming(&viif_dev->cap_dev0.vb2_vq))
> > +		cur_stat_buf->csi2rx_err = csi_err_not_streaming;
> > +	else
> > +		visconti_viif_csi2rx_get_err_status(viif_dev,
> > +&cur_stat_buf->csi2rx_err);
> > +
> > +	read_isp_capture_regs(&cur_stat_buf->isp_capture.l1_info, viif_dev);
> > +
> > +	cur_stat_buf->errors.main = viif_dev->reported_err_main;
> > +	cur_stat_buf->errors.sub = viif_dev->reported_err_sub;
> > +	cur_stat_buf->errors.csi2rx = viif_dev->reported_err_csi2rx;
> > +	viif_dev->reported_err_main = 0;
> > +	viif_dev->reported_err_sub = 0;
> > +	viif_dev->reported_err_csi2rx = 0;
> > +
> > +	vb2_set_plane_payload(&cur_buf->vb.vb2_buf, 0, sizeof(struct
> > +visconti_viif_isp_stat));
> > +
> > +	cur_buf->vb.sequence = sequence;
> > +	cur_buf->vb.vb2_buf.timestamp = timestamp;
> > +	vb2_buffer_done(&cur_buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
> > +
> > +done:
> > +	spin_unlock(&stats_dev->stats_lock);
> > +}
> > +
> > +static int viif_stats_enum_fmt_meta_cap(struct file *file, void
> > +*priv, struct v4l2_fmtdesc *f) {
> > +	struct video_device *vdev = video_devdata(file);
> > +
> > +	if (f->index > 0 || f->type != vdev->queue->type)
> > +		return -EINVAL;
> > +
> > +	f->pixelformat = V4L2_META_FMT_VISCONTI_VIIF_STATS;
> > +
> > +	return 0;
> > +}
> > +
> > +static int viif_stats_g_fmt_meta_cap(struct file *file, void *priv,
> > +struct v4l2_format *f) {
> > +	struct video_device *vdev = video_devdata(file);
> > +	struct v4l2_meta_format *meta = &f->fmt.meta;
> > +
> > +	if (f->type != vdev->queue->type)
> > +		return -EINVAL;
> > +
> > +	memset(meta, 0, sizeof(*meta));
> > +	meta->dataformat = V4L2_META_FMT_VISCONTI_VIIF_STATS;
> > +	meta->buffersize = sizeof(struct visconti_viif_isp_stat);
> > +
> > +	return 0;
> > +}
> > +
> > +static int viif_stats_querycap(struct file *file, void *priv, struct
> > +v4l2_capability *cap) {
> > +	struct video_device *vdev = video_devdata(file);
> > +
> > +	strscpy(cap->driver, VIIF_DRIVER_NAME, sizeof(cap->driver));
> > +	strscpy(cap->card, vdev->name, sizeof(cap->card));
> > +	strscpy(cap->bus_info, VIIF_BUS_INFO_BASE "-0",
> > +sizeof(cap->bus_info));
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct v4l2_ioctl_ops viif_stats_ioctl = {
> > +	.vidioc_reqbufs = vb2_ioctl_reqbufs,
> > +	.vidioc_querybuf = vb2_ioctl_querybuf,
> > +	.vidioc_create_bufs = vb2_ioctl_create_bufs,
> > +	.vidioc_qbuf = vb2_ioctl_qbuf,
> > +	.vidioc_dqbuf = vb2_ioctl_dqbuf,
> > +	.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
> > +	.vidioc_expbuf = vb2_ioctl_expbuf,
> > +	.vidioc_streamon = vb2_ioctl_streamon,
> > +	.vidioc_streamoff = vb2_ioctl_streamoff,
> > +	.vidioc_enum_fmt_meta_cap = viif_stats_enum_fmt_meta_cap,
> > +	.vidioc_g_fmt_meta_cap = viif_stats_g_fmt_meta_cap,
> > +	.vidioc_s_fmt_meta_cap = viif_stats_g_fmt_meta_cap,
> > +	.vidioc_try_fmt_meta_cap = viif_stats_g_fmt_meta_cap,
> > +	.vidioc_querycap = viif_stats_querycap,
> > +	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
> > +	.vidioc_unsubscribe_event = v4l2_event_unsubscribe, };
> > +
> > +static const struct v4l2_file_operations viif_stats_fops = { .mmap =
> vb2_fop_mmap,
> > +							     .unlocked_ioctl
> = video_ioctl2,
> > +							     .poll =
> vb2_fop_poll,
> > +							     .open =
> v4l2_fh_open,
> > +							     .release =
> vb2_fop_release };
> 
> Weird layout.
> 

I'll fix the layout.

> > +
> > +static int viif_stats_vb2_queue_setup(struct vb2_queue *vq, unsigned int
> *num_buffers,
> > +				      unsigned int *num_planes, unsigned
> int sizes[],
> > +				      struct device *alloc_devs[]) {
> > +	*num_planes = 1;
> > +	*num_buffers = clamp_t(u32, *num_buffers, 2, 8);
> > +	sizes[0] = sizeof(struct visconti_viif_isp_stat);
> > +
> > +	return 0;
> > +}
> > +
> > +static inline struct viif_buffer *vb2_to_viif(struct vb2_v4l2_buffer
> > +*vbuf) {
> > +	return container_of(vbuf, struct viif_buffer, vb); }
> > +
> > +static inline struct stats_dev *vb2queue_to_statsdev(struct vb2_queue
> > +*q) {
> > +	return (struct stats_dev *)vb2_get_drv_priv(q); }
> > +
> > +static void viif_stats_vb2_buf_queue(struct vb2_buffer *vb) {
> > +	struct stats_dev *stats_dev = vb2queue_to_statsdev(vb->vb2_queue);
> > +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> > +	struct viif_buffer *buf = vb2_to_viif(vbuf);
> > +
> > +	spin_lock_irq(&stats_dev->stats_lock);
> > +	list_add_tail(&buf->queue, &stats_dev->stats_queue);
> > +	spin_unlock_irq(&stats_dev->stats_lock);
> > +}
> > +
> > +static int viif_stats_vb2_buf_prepare(struct vb2_buffer *vb) {
> > +	if (vb2_plane_size(vb, 0) < sizeof(struct visconti_viif_isp_stat))
> > +		return -EINVAL;
> > +
> > +	vb2_set_plane_payload(vb, 0, sizeof(struct visconti_viif_isp_stat));
> > +
> > +	return 0;
> > +}
> > +
> > +static void viif_stats_vb2_stop_streaming(struct vb2_queue *q) {
> > +	struct stats_dev *stats_dev = vb2queue_to_statsdev(q);
> > +	struct viif_buffer *buf;
> > +	unsigned int i;
> > +
> > +	spin_lock_irq(&stats_dev->stats_lock);
> > +	for (i = 0; i < 8; i++) {
> > +		if (list_empty(&stats_dev->stats_queue))
> > +			break;
> > +		buf = list_first_entry(&stats_dev->stats_queue, struct
> viif_buffer, queue);
> > +		list_del(&buf->queue);
> > +		vb2_buffer_done(&buf->vb.vb2_buf,
> VB2_BUF_STATE_ERROR);
> > +	}
> > +	spin_unlock_irq(&stats_dev->stats_lock);
> > +}
> > +
> > +static const struct vb2_ops viif_stats_vb2_ops = {
> > +	.queue_setup = viif_stats_vb2_queue_setup,
> > +	.wait_prepare = vb2_ops_wait_prepare,
> > +	.wait_finish = vb2_ops_wait_finish,
> > +	.buf_queue = viif_stats_vb2_buf_queue,
> > +	.buf_prepare = viif_stats_vb2_buf_prepare,
> > +	.stop_streaming = viif_stats_vb2_stop_streaming, };
> > +
> > +int visconti_viif_stats_register(struct viif_device *viif_dev) {
> > +	struct stats_dev *stats_dev = &viif_dev->stats_dev;
> > +	struct video_device *vdev = &stats_dev->vdev;
> > +	struct vb2_queue *q = &stats_dev->vb2_vq;
> > +	int ret;
> > +
> > +	mutex_init(&stats_dev->vlock);
> > +	INIT_LIST_HEAD(&stats_dev->stats_queue);
> > +	spin_lock_init(&stats_dev->stats_lock);
> > +
> > +	strscpy(vdev->name, "viif_stats", sizeof(vdev->name));
> > +
> > +	/* Register the video device */
> > +	video_set_drvdata(vdev, stats_dev);
> > +	vdev->ioctl_ops = &viif_stats_ioctl;
> > +	vdev->fops = &viif_stats_fops;
> > +	vdev->release = video_device_release_empty;
> > +	vdev->lock = &stats_dev->vlock;
> > +	vdev->v4l2_dev = &viif_dev->v4l2_dev;
> > +	vdev->queue = &stats_dev->vb2_vq;
> > +	vdev->device_caps = V4L2_CAP_META_CAPTURE |
> V4L2_CAP_STREAMING;
> > +	vdev->vfl_dir = VFL_DIR_RX;
> > +
> > +	/* Initialize vb2 queue */
> > +	q->type = V4L2_BUF_TYPE_META_CAPTURE;
> > +	q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
> 
> Same question regarding VB2_USERPTR: do you really need this?
> 

I'll remove VB2_USERPTR.

> > +	q->drv_priv = stats_dev;
> > +	q->ops = &viif_stats_vb2_ops;
> > +	q->mem_ops = &vb2_vmalloc_memops;
> > +	q->buf_struct_size = sizeof(struct viif_buffer);
> > +	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
> > +	q->lock = &stats_dev->vlock;
> > +	q->dev = viif_dev->v4l2_dev.dev;
> > +
> > +	ret = vb2_queue_init(q);
> > +	if (ret)
> > +		return ret;
> > +
> > +	stats_dev->stats_pad.flags = MEDIA_PAD_FL_SINK;
> > +	ret = media_entity_pads_init(&vdev->entity, VIIF_STATS_PAD_NUM,
> &stats_dev->stats_pad);
> > +	if (ret)
> > +		goto error;
> > +
> > +	ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
> > +	if (ret) {
> > +		dev_err(viif_dev->v4l2_dev.dev, "video_register_device
> failed: %d\n", ret);
> > +		goto error;
> > +	}
> > +
> > +	return 0;
> > +
> > +error:
> > +	media_entity_cleanup(&vdev->entity);
> > +	mutex_destroy(&stats_dev->vlock);
> > +
> > +	return ret;
> > +}
> > +
> > +void visconti_viif_stats_unregister(struct viif_device *viif_dev) {
> > +	struct stats_dev *stats_dev = &viif_dev->stats_dev;
> > +	struct video_device *vdev = &stats_dev->vdev;
> > +
> > +	if (!video_is_registered(vdev))
> > +		return;
> > +
> > +	vb2_video_unregister_device(vdev);
> > +	media_entity_cleanup(&vdev->entity);
> > +	mutex_destroy(&stats_dev->vlock);
> > +}
> > diff --git a/drivers/media/platform/toshiba/visconti/viif_stats.h
> > b/drivers/media/platform/toshiba/visconti/viif_stats.h
> > new file mode 100644
> > index 0000000000..3f778c58ef
> > --- /dev/null
> > +++ b/drivers/media/platform/toshiba/visconti/viif_stats.h
> > @@ -0,0 +1,14 @@
> > +/* SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause */
> > +/* Toshiba Visconti Video Capture Support
> > + *
> > + * (C) Copyright 2023 TOSHIBA CORPORATION
> > + * (C) Copyright 2023 Toshiba Electronic Devices & Storage
> > +Corporation  */
> > +
> > +#ifndef VIIF_STATS_H
> > +#define VIIF_STATS_H
> > +
> > +void visconti_viif_stats_isr(struct viif_device *viif_dev, unsigned
> > +int sequence, u64 timestamp); int visconti_viif_stats_register(struct
> > +viif_device *viif_dev); void visconti_viif_stats_unregister(struct
> > +viif_device *viif_dev); #endif /* VIIF_STATS_H */
> 
> Regards,
> 
> 	Hans

Best Regards,
Yuji

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