Date:   Mon, 19 Sep 2016 12:04:51 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Andy Gross <andy.gross@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 3/8] media: vidc: decoder: add video decoder files

On 09/07/2016 01:37 PM, Stanimir Varbanov wrote:
> This consists of video decoder implementation plus decoder
> controls.
> 
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
> ---
>  drivers/media/platform/qcom/vidc/vdec.c       | 1091 +++++++++++++++++++++++++
>  drivers/media/platform/qcom/vidc/vdec.h       |   29 +
>  drivers/media/platform/qcom/vidc/vdec_ctrls.c |  200 +++++
>  drivers/media/platform/qcom/vidc/vdec_ctrls.h |   21 +
>  4 files changed, 1341 insertions(+)
>  create mode 100644 drivers/media/platform/qcom/vidc/vdec.c
>  create mode 100644 drivers/media/platform/qcom/vidc/vdec.h
>  create mode 100644 drivers/media/platform/qcom/vidc/vdec_ctrls.c
>  create mode 100644 drivers/media/platform/qcom/vidc/vdec_ctrls.h
> 
> diff --git a/drivers/media/platform/qcom/vidc/vdec.c b/drivers/media/platform/qcom/vidc/vdec.c
> new file mode 100644
> index 000000000000..433fe4f697d1
> --- /dev/null
> +++ b/drivers/media/platform/qcom/vidc/vdec.c
> @@ -0,0 +1,1091 @@
> +/*
> + * Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
> + * Copyright (C) 2016 Linaro Ltd.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + */
> +#include <linux/slab.h>
> +#include <linux/pm_runtime.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/videobuf2-dma-sg.h>
> +
> +#include "core.h"
> +#include "helpers.h"
> +#include "vdec_ctrls.h"
> +
> +#define MACROBLOCKS_PER_PIXEL	(16 * 16)
> +
> +static u32 get_framesize_nv12(int plane, u32 height, u32 width)
> +{
> +	u32 y_stride, uv_stride, y_plane;
> +	u32 y_sclines, uv_sclines, uv_plane;
> +	u32 size;
> +
> +	y_stride = ALIGN(width, 128);
> +	uv_stride = ALIGN(width, 128);
> +	y_sclines = ALIGN(height, 32);
> +	uv_sclines = ALIGN(((height + 1) >> 1), 16);
> +
> +	y_plane = y_stride * y_sclines;
> +	uv_plane = uv_stride * uv_sclines + SZ_4K;
> +	size = y_plane + uv_plane + SZ_8K;
> +
> +	return ALIGN(size, SZ_4K);
> +}
> +
> +static u32 get_framesize_compressed(u32 mbs_per_frame)
> +{
> +	return ((mbs_per_frame * MACROBLOCKS_PER_PIXEL * 3 / 2) / 2) + 128;
> +}
> +
> +static const struct vidc_format vdec_formats[] = {
> +	{
> +		.pixfmt = V4L2_PIX_FMT_NV12,
> +		.num_planes = 1,
> +		.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE,
> +	}, {
> +		.pixfmt = V4L2_PIX_FMT_MPEG4,
> +		.num_planes = 1,
> +		.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE,
> +	}, {
> +		.pixfmt = V4L2_PIX_FMT_MPEG2,
> +		.num_planes = 1,
> +		.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE,
> +	}, {
> +		.pixfmt = V4L2_PIX_FMT_H263,
> +		.num_planes = 1,
> +		.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE,
> +	}, {
> +		.pixfmt = V4L2_PIX_FMT_VC1_ANNEX_G,
> +		.num_planes = 1,
> +		.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE,
> +	}, {
> +		.pixfmt = V4L2_PIX_FMT_VC1_ANNEX_L,
> +		.num_planes = 1,
> +		.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE,
> +	}, {
> +		.pixfmt = V4L2_PIX_FMT_H264,
> +		.num_planes = 1,
> +		.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE,
> +	}, {
> +		.pixfmt = V4L2_PIX_FMT_VP8,
> +		.num_planes = 1,
> +		.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE,
> +	}, {
> +		.pixfmt = V4L2_PIX_FMT_XVID,
> +		.num_planes = 1,
> +		.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE,
> +	},
> +};
> +
> +static const struct vidc_format *find_format(u32 pixfmt, u32 type)
> +{
> +	const struct vidc_format *fmt = vdec_formats;
> +	unsigned int size = ARRAY_SIZE(vdec_formats);
> +	unsigned int i;
> +
> +	for (i = 0; i < size; i++) {
> +		if (fmt[i].pixfmt == pixfmt)
> +			break;
> +	}
> +
> +	if (i == size || fmt[i].type != type)
> +		return NULL;
> +
> +	return &fmt[i];
> +}
> +
> +static const struct vidc_format *find_format_by_index(int index, u32 type)
> +{
> +	const struct vidc_format *fmt = vdec_formats;
> +	unsigned int size = ARRAY_SIZE(vdec_formats);
> +	int i, k = 0;
> +
> +	if (index < 0 || index > size)
> +		return NULL;
> +
> +	for (i = 0; i < size; i++) {
> +		if (fmt[i].type != type)
> +			continue;
> +		if (k == index)
> +			break;
> +		k++;
> +	}
> +
> +	if (i == size)
> +		return NULL;
> +
> +	return &fmt[i];
> +}
> +
> +static int vdec_set_properties(struct vidc_inst *inst)
> +{
> +	struct vdec_controls *ctr = &inst->controls.dec;
> +	struct hfi_core *hfi = &inst->core->hfi;
> +	struct hfi_enable en = { .enable = 1 };
> +	struct hfi_framerate frate;
> +	u32 ptype;
> +	int ret;
> +
> +	ptype = HFI_PROPERTY_PARAM_VDEC_CONTINUE_DATA_TRANSFER;
> +	ret = vidc_hfi_session_set_property(hfi, inst->hfi_inst, ptype, &en);
> +	if (ret)
> +		return ret;
> +
> +	ptype = HFI_PROPERTY_CONFIG_FRAME_RATE;
> +	frate.buffer_type = HFI_BUFFER_INPUT;
> +	frate.framerate = inst->fps * (1 << 16);
> +
> +	ret = vidc_hfi_session_set_property(hfi, inst->hfi_inst, ptype, &frate);
> +	if (ret)
> +		return ret;
> +
> +	if (ctr->post_loop_deb_mode) {
> +		ptype = HFI_PROPERTY_CONFIG_VDEC_POST_LOOP_DEBLOCKER;
> +		en.enable = 1;
> +		ret = vidc_hfi_session_set_property(hfi, inst->hfi_inst, ptype,
> +						    &en);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct vidc_format *
> +vdec_try_fmt_common(struct vidc_inst *inst, struct v4l2_format *f)
> +{
> +	struct v4l2_pix_format_mplane *pixmp = &f->fmt.pix_mp;
> +	struct v4l2_plane_pix_format *pfmt = pixmp->plane_fmt;
> +	struct hfi_inst *hfi_inst = inst->hfi_inst;
> +	const struct vidc_format *fmt;
> +	unsigned int p;
> +
> +	memset(pfmt[0].reserved, 0, sizeof(pfmt[0].reserved));
> +	memset(pixmp->reserved, 0, sizeof(pixmp->reserved));
> +
> +	fmt = find_format(pixmp->pixelformat, f->type);
> +	if (!fmt) {
> +		if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> +			pixmp->pixelformat = V4L2_PIX_FMT_NV12;
> +		else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
> +			pixmp->pixelformat = V4L2_PIX_FMT_H264;
> +		else
> +			return NULL;

This can't happen.

> +		fmt = find_format(pixmp->pixelformat, f->type);
> +		pixmp->width = 1280;
> +		pixmp->height = 720;

Why would you update the width/height as well?

> +	}
> +
> +	if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> +		pixmp->height = ALIGN(pixmp->height, 32);
> +
> +	pixmp->width = clamp(pixmp->width, hfi_inst->width.min,
> +			     hfi_inst->width.max);
> +	pixmp->height = clamp(pixmp->height, hfi_inst->height.min,
> +			      hfi_inst->height.max);
> +	if (pixmp->field == V4L2_FIELD_ANY)
> +		pixmp->field = V4L2_FIELD_NONE;
> +	pixmp->num_planes = fmt->num_planes;
> +	pixmp->flags = 0;
> +
> +	if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
> +		for (p = 0; p < pixmp->num_planes; p++) {
> +			pfmt[p].sizeimage = get_framesize_nv12(p, pixmp->height,
> +							       pixmp->width);
> +
> +			pfmt[p].bytesperline = ALIGN(pixmp->width, 128);
> +		}
> +	} else {
> +		u32 mbs = pixmp->width * pixmp->height / MACROBLOCKS_PER_PIXEL;
> +
> +		pfmt[0].sizeimage = get_framesize_compressed(mbs);
> +		pfmt[0].bytesperline = 0;
> +	}
> +
> +	return fmt;
> +}
> +
> +static int vdec_try_fmt(struct file *file, void *fh, struct v4l2_format *f)
> +{
> +	struct vidc_inst *inst = to_inst(file);
> +	const struct vidc_format *fmt;
> +
> +	fmt = vdec_try_fmt_common(inst, f);
> +	if (!fmt)
> +		return -EINVAL;
> +
> +	return 0;
> +}
> +
> +static int vdec_g_fmt(struct file *file, void *fh, struct v4l2_format *f)
> +{
> +	struct vidc_inst *inst = to_inst(file);
> +	const struct vidc_format *fmt = NULL;
> +	struct v4l2_pix_format_mplane *pixmp = &f->fmt.pix_mp;
> +
> +	if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> +		fmt = inst->fmt_cap;
> +	else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
> +		fmt = inst->fmt_out;
> +
> +	if (inst->in_reconfig) {
> +		inst->height = inst->reconfig_height;
> +		inst->width = inst->reconfig_width;
> +		inst->in_reconfig = false;
> +	}
> +
> +	pixmp->pixelformat = fmt->pixfmt;
> +
> +	if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
> +		pixmp->width = inst->width;
> +		pixmp->height = inst->height;
> +		pixmp->colorspace = inst->colorspace;
> +		pixmp->ycbcr_enc = inst->ycbcr_enc;
> +		pixmp->quantization = inst->quantization;
> +		pixmp->xfer_func = inst->xfer_func;
> +	} else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> +		pixmp->width = inst->out_width;
> +		pixmp->height = inst->out_height;
> +	}
> +
> +	vdec_try_fmt_common(inst, f);
> +
> +	return 0;
> +}
> +
> +static int vdec_s_fmt(struct file *file, void *fh, struct v4l2_format *f)
> +{
> +	struct vidc_inst *inst = to_inst(file);
> +	struct v4l2_pix_format_mplane *pixmp = &f->fmt.pix_mp;
> +	struct v4l2_pix_format_mplane orig_pixmp;
> +	const struct vidc_format *fmt;
> +	struct v4l2_format format;
> +	u32 pixfmt_out = 0, pixfmt_cap = 0;
> +
> +	orig_pixmp = *pixmp;
> +
> +	fmt = vdec_try_fmt_common(inst, f);
> +	if (!fmt)
> +		return -EINVAL;
> +
> +	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> +		pixfmt_out = pixmp->pixelformat;
> +		pixfmt_cap = inst->fmt_cap->pixfmt;
> +	} else if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
> +		pixfmt_cap = pixmp->pixelformat;
> +		pixfmt_out = inst->fmt_out->pixfmt;
> +	}
> +
> +	memset(&format, 0, sizeof(format));
> +
> +	format.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
> +	format.fmt.pix_mp.pixelformat = pixfmt_out;
> +	format.fmt.pix_mp.width = orig_pixmp.width;
> +	format.fmt.pix_mp.height = orig_pixmp.height;
> +	vdec_try_fmt_common(inst, &format);
> +	inst->out_width = format.fmt.pix_mp.width;
> +	inst->out_height = format.fmt.pix_mp.height;
> +	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> +		inst->colorspace = pixmp->colorspace;
> +		inst->ycbcr_enc = pixmp->ycbcr_enc;
> +		inst->quantization = pixmp->quantization;
> +		inst->xfer_func = pixmp->xfer_func;
> +	}
> +
> +	memset(&format, 0, sizeof(format));
> +
> +	format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> +	format.fmt.pix_mp.pixelformat = pixfmt_cap;
> +	format.fmt.pix_mp.width = orig_pixmp.width;
> +	format.fmt.pix_mp.height = orig_pixmp.height;
> +	vdec_try_fmt_common(inst, &format);
> +	inst->width = format.fmt.pix_mp.width;
> +	inst->height = format.fmt.pix_mp.height;
> +
> +	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
> +		inst->fmt_out = fmt;
> +	else if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> +		inst->fmt_cap = fmt;
> +
> +	return 0;
> +}
> +
> +static int
> +vdec_g_selection(struct file *file, void *priv, struct v4l2_selection *s)
> +{
> +	struct vidc_inst *inst = to_inst(file);
> +
> +	if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> +		return -EINVAL;
> +
> +	switch (s->target) {
> +	case V4L2_SEL_TGT_CROP_DEFAULT:
> +	case V4L2_SEL_TGT_CROP_BOUNDS:
> +	case V4L2_SEL_TGT_CROP:
> +	case V4L2_SEL_TGT_COMPOSE_DEFAULT:
> +	case V4L2_SEL_TGT_COMPOSE_BOUNDS:
> +	case V4L2_SEL_TGT_COMPOSE:

This is almost certainly wrong.

For capture I would expect that you can do compose, but not crop.

This would likely explain that v4l2-compliance thinks that the driver can
scale:

                test Scaling: OK

> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	s->r.top = 0;
> +	s->r.left = 0;
> +	s->r.width = inst->out_width;
> +	s->r.height = inst->out_height;
> +
> +	return 0;
> +}
> +
> +static int
> +vdec_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *b)
> +{
> +	struct vb2_queue *queue = vidc_to_vb2q(file, b->type);
> +
> +	if (!queue)
> +		return -EINVAL;
> +
> +	if (!b->count)
> +		vb2_core_queue_release(queue);

Drop this, it's handled by vb2_reqbufs.

> +
> +	return vb2_reqbufs(queue, b);
> +}
> +
> +static int
> +vdec_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
> +{
> +	strlcpy(cap->driver, VIDC_DRV_NAME, sizeof(cap->driver));
> +	strlcpy(cap->card, "video decoder", sizeof(cap->card));

"video decoder" is *very* generic, I recommend putting Qualcomm in the card description.

> +	strlcpy(cap->bus_info, "platform:vidc", sizeof(cap->bus_info));

Same really for vidc: I strongly recommend something like "qcom-vidc".
Ditto for VIDC_DRV_NAME.

> +
> +	return 0;
> +}
> +
> +static int vdec_enum_fmt(struct file *file, void *fh, struct v4l2_fmtdesc *f)
> +{
> +	const struct vidc_format *fmt;
> +
> +	memset(f->reserved, 0, sizeof(f->reserved));
> +
> +	fmt = find_format_by_index(f->index, f->type);
> +	if (!fmt)
> +		return -EINVAL;
> +
> +	f->pixelformat = fmt->pixfmt;
> +
> +	return 0;
> +}
> +
> +static int vdec_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
> +{
> +	struct vb2_queue *queue = vidc_to_vb2q(file, b->type);
> +	unsigned int p;
> +	int ret;
> +
> +	if (!queue)
> +		return -EINVAL;
> +
> +	ret = vb2_querybuf(queue, b);
> +	if (ret)
> +		return ret;
> +
> +	if (b->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE &&
> +	    b->memory == V4L2_MEMORY_MMAP) {
> +		for (p = 0; p < b->length; p++)
> +			b->m.planes[p].m.mem_offset += DST_QUEUE_OFF_BASE;
> +	}
> +
> +	return 0;
> +}
> +
> +static int
> +vdec_create_bufs(struct file *file, void *fh, struct v4l2_create_buffers *b)
> +{
> +	struct vb2_queue *queue = vidc_to_vb2q(file, b->format.type);
> +
> +	if (!queue)
> +		return -EINVAL;

Can queue ever be NULL?

> +
> +	return vb2_create_bufs(queue, b);
> +}
> +
> +static int vdec_prepare_buf(struct file *file, void *fh, struct v4l2_buffer *b)
> +{
> +	struct vb2_queue *queue = vidc_to_vb2q(file, b->type);
> +
> +	if (!queue)
> +		return -EINVAL;
> +
> +	return vb2_prepare_buf(queue, b);
> +}
> +
> +static int vdec_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
> +{
> +	struct vb2_queue *queue = vidc_to_vb2q(file, b->type);
> +
> +	if (!queue)
> +		return -EINVAL;
> +
> +	return vb2_qbuf(queue, b);
> +}
> +
> +static int
> +vdec_exportbuf(struct file *file, void *fh, struct v4l2_exportbuffer *b)
> +{
> +	struct vb2_queue *queue = vidc_to_vb2q(file, b->type);
> +
> +	if (!queue)
> +		return -EINVAL;
> +
> +	return vb2_expbuf(queue, b);
> +}
> +
> +static int vdec_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
> +{
> +	struct vb2_queue *queue = vidc_to_vb2q(file, b->type);
> +
> +	if (!queue)
> +		return -EINVAL;
> +
> +	return vb2_dqbuf(queue, b, file->f_flags & O_NONBLOCK);
> +}
> +
> +static int vdec_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
> +{
> +	struct vb2_queue *queue = vidc_to_vb2q(file, type);
> +
> +	if (!queue)
> +		return -EINVAL;
> +
> +	return vb2_streamon(queue, type);
> +}
> +
> +static int vdec_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
> +{
> +	struct vb2_queue *queue = vidc_to_vb2q(file, type);
> +
> +	if (!queue)
> +		return -EINVAL;
> +
> +	return vb2_streamoff(queue, type);
> +}
> +
> +static int vdec_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
> +{
> +	struct vidc_inst *inst = to_inst(file);
> +	struct v4l2_captureparm *cap = &a->parm.capture;
> +	struct v4l2_fract *timeperframe = &cap->timeperframe;
> +	u64 us_per_frame, fps;
> +
> +	if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE &&
> +	    a->type != V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
> +		return -EINVAL;
> +
> +	memset(cap->reserved, 0, sizeof(cap->reserved));
> +	if (!timeperframe->denominator)
> +		timeperframe->denominator = inst->timeperframe.denominator;
> +	if (!timeperframe->numerator)
> +		timeperframe->numerator = inst->timeperframe.numerator;
> +	cap->readbuffers = 0;
> +	cap->extendedmode = 0;
> +	cap->capability = V4L2_CAP_TIMEPERFRAME;
> +	us_per_frame = timeperframe->numerator * (u64)USEC_PER_SEC;
> +	do_div(us_per_frame, timeperframe->denominator);
> +
> +	if (!us_per_frame)
> +		return -EINVAL;
> +
> +	fps = (u64)USEC_PER_SEC;
> +	do_div(fps, us_per_frame);
> +
> +	inst->fps = fps;
> +	inst->timeperframe = *timeperframe;
> +
> +	return 0;
> +}
> +
> +static int vdec_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
> +{
> +	struct vidc_inst *inst = to_inst(file);
> +
> +	if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE &&
> +	    a->type != V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
> +		return -EINVAL;
> +
> +	a->parm.capture.capability |= V4L2_CAP_TIMEPERFRAME;
> +	a->parm.capture.timeperframe = inst->timeperframe;
> +
> +	return 0;
> +}
> +
> +static int vdec_enum_framesizes(struct file *file, void *fh,
> +				struct v4l2_frmsizeenum *fsize)
> +{
> +	struct hfi_inst *hfi_inst = to_hfi_inst(file);
> +	const struct vidc_format *fmt;
> +
> +	fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
> +
> +	fmt = find_format(fsize->pixel_format,
> +			  V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
> +	if (!fmt) {
> +		fmt = find_format(fsize->pixel_format,
> +				  V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
> +		if (!fmt)
> +			return -EINVAL;
> +	}
> +
> +	if (fsize->index)
> +		return -EINVAL;
> +
> +	fsize->stepwise.min_width = hfi_inst->width.min;
> +	fsize->stepwise.max_width = hfi_inst->width.max;
> +	fsize->stepwise.step_width = hfi_inst->width.step_size;
> +	fsize->stepwise.min_height = hfi_inst->height.min;
> +	fsize->stepwise.max_height = hfi_inst->height.max;
> +	fsize->stepwise.step_height = hfi_inst->height.step_size;
> +
> +	return 0;
> +}
> +
> +static int vdec_enum_frameintervals(struct file *file, void *fh,
> +				    struct v4l2_frmivalenum *fival)
> +{
> +	struct hfi_inst *hfi_inst = to_hfi_inst(file);
> +	const struct vidc_format *fmt;
> +
> +	fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
> +
> +	fmt = find_format(fival->pixel_format,
> +			  V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
> +	if (!fmt)
> +		return -EINVAL;
> +
> +	if (fival->index)
> +		return -EINVAL;
> +
> +	if (!fival->width || !fival->height)
> +		return -EINVAL;
> +
> +	if (fival->width > hfi_inst->width.max ||
> +	    fival->width < hfi_inst->width.min ||
> +	    fival->height > hfi_inst->height.max ||
> +	    fival->height < hfi_inst->height.min)
> +		return -EINVAL;
> +
> +	fival->stepwise.min.numerator = hfi_inst->framerate.min;
> +	fival->stepwise.min.denominator = 1;
> +	fival->stepwise.max.numerator = hfi_inst->framerate.max;
> +	fival->stepwise.max.denominator = 1;
> +	fival->stepwise.step.numerator = hfi_inst->framerate.step_size;
> +	fival->stepwise.step.denominator = 1;
> +
> +	return 0;
> +}
> +
> +static int vdec_subscribe_event(struct v4l2_fh *fh,
> +				const struct v4l2_event_subscription *sub)
> +{
> +	switch (sub->type) {
> +	case V4L2_EVENT_EOS:
> +		return v4l2_event_subscribe(fh, sub, 2, NULL);
> +	case V4L2_EVENT_SOURCE_CHANGE:
> +		return v4l2_src_change_event_subscribe(fh, sub);
> +	case V4L2_EVENT_CTRL:
> +		return v4l2_ctrl_subscribe_event(fh, sub);
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static const struct v4l2_ioctl_ops vdec_ioctl_ops = {
> +	.vidioc_querycap = vdec_querycap,
> +	.vidioc_enum_fmt_vid_cap_mplane = vdec_enum_fmt,
> +	.vidioc_enum_fmt_vid_out_mplane = vdec_enum_fmt,
> +	.vidioc_s_fmt_vid_cap_mplane = vdec_s_fmt,
> +	.vidioc_s_fmt_vid_out_mplane = vdec_s_fmt,
> +	.vidioc_g_fmt_vid_cap_mplane = vdec_g_fmt,
> +	.vidioc_g_fmt_vid_out_mplane = vdec_g_fmt,
> +	.vidioc_try_fmt_vid_cap_mplane = vdec_try_fmt,
> +	.vidioc_try_fmt_vid_out_mplane = vdec_try_fmt,
> +	.vidioc_g_selection = vdec_g_selection,
> +	.vidioc_reqbufs = vdec_reqbufs,
> +	.vidioc_querybuf = vdec_querybuf,
> +	.vidioc_create_bufs = vdec_create_bufs,
> +	.vidioc_prepare_buf = vdec_prepare_buf,
> +	.vidioc_qbuf = vdec_qbuf,
> +	.vidioc_expbuf = vdec_exportbuf,
> +	.vidioc_dqbuf = vdec_dqbuf,
> +	.vidioc_streamon = vdec_streamon,
> +	.vidioc_streamoff = vdec_streamoff,
> +	.vidioc_s_parm = vdec_s_parm,
> +	.vidioc_g_parm = vdec_g_parm,
> +	.vidioc_enum_framesizes = vdec_enum_framesizes,
> +	.vidioc_enum_frameintervals = vdec_enum_frameintervals,
> +	.vidioc_subscribe_event = vdec_subscribe_event,
> +	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> +};
> +
> +static int vdec_init_session(struct vidc_inst *inst)
> +{
> +	struct hfi_core *hfi = &inst->core->hfi;
> +	u32 pixfmt = inst->fmt_out->pixfmt;
> +	struct hfi_framesize fs;
> +	u32 ptype;
> +	int ret;
> +
> +	ret = vidc_hfi_session_init(hfi, inst->hfi_inst, pixfmt,
> +				    VIDC_SESSION_TYPE_DEC);
> +	if (ret)
> +		return ret;
> +
> +	ptype = HFI_PROPERTY_PARAM_FRAME_SIZE;
> +	fs.buffer_type = HFI_BUFFER_INPUT;
> +	fs.width = inst->out_width;
> +	fs.height = inst->out_height;
> +
> +	ret = vidc_hfi_session_set_property(hfi, inst->hfi_inst, ptype, &fs);
> +	if (ret)
> +		goto err;
> +
> +	fs.buffer_type = HFI_BUFFER_OUTPUT;
> +	fs.width = inst->width;
> +	fs.height = inst->height;
> +
> +	ret = vidc_hfi_session_set_property(hfi, inst->hfi_inst, ptype, &fs);
> +	if (ret)
> +		goto err;
> +
> +	pixfmt = inst->fmt_cap->pixfmt;
> +
> +	ret = vidc_set_color_format(inst, HFI_BUFFER_OUTPUT, pixfmt);
> +	if (ret)
> +		goto err;
> +
> +	return 0;
> +err:
> +	vidc_hfi_session_deinit(hfi, inst->hfi_inst);
> +	return ret;
> +}
> +
> +static int vdec_cap_num_buffers(struct vidc_inst *inst,
> +				struct hfi_buffer_requirements *bufreq)
> +{
> +	struct hfi_core *hfi = &inst->core->hfi;
> +	struct device *dev = inst->core->dev;
> +	int ret, ret2;
> +
> +	ret = pm_runtime_get_sync(dev);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = vdec_init_session(inst);
> +	if (ret)
> +		goto put_sync;
> +
> +	ret = vidc_get_bufreq(inst, HFI_BUFFER_OUTPUT, bufreq);
> +
> +	vidc_hfi_session_deinit(hfi, inst->hfi_inst);
> +
> +put_sync:
> +	ret2 = pm_runtime_put_sync(dev);
> +
> +	return ret ? ret : ret2;
> +}
> +
> +static int vdec_queue_setup(struct vb2_queue *q,
> +			    unsigned int *num_buffers, unsigned int *num_planes,
> +			    unsigned int sizes[], struct device *alloc_devs[])
> +{
> +	struct vidc_inst *inst = vb2_get_drv_priv(q);
> +	struct hfi_buffer_requirements bufreq;
> +	unsigned int p;
> +	int ret = 0;
> +	u32 mbs;
> +
> +	switch (q->type) {
> +	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
> +		*num_planes = inst->fmt_out->num_planes;
> +
> +		*num_buffers = clamp_val(*num_buffers, 4, VIDEO_MAX_FRAME);
> +
> +		mbs = inst->out_width * inst->out_height /
> +				MACROBLOCKS_PER_PIXEL;
> +		for (p = 0; p < *num_planes; p++)
> +			sizes[p] = get_framesize_compressed(mbs);
> +
> +		inst->num_input_bufs = *num_buffers;
> +		break;
> +	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
> +		*num_planes = inst->fmt_cap->num_planes;
> +
> +		ret = vdec_cap_num_buffers(inst, &bufreq);
> +		if (ret)
> +			break;
> +
> +		*num_buffers = max(*num_buffers, bufreq.count_actual);
> +
> +		for (p = 0; p < *num_planes; p++)
> +			sizes[p] = get_framesize_nv12(p, inst->height,
> +						      inst->width);
> +
> +		inst->num_output_bufs = *num_buffers;
> +		break;
> +	default:
> +		ret = -EINVAL;
> +		break;
> +	}
> +
> +	return ret;
> +}
> +
> +static int vdec_check_configuration(struct vidc_inst *inst)
> +{
> +	struct hfi_buffer_requirements bufreq;
> +	int ret;
> +
> +	ret = vidc_get_bufreq(inst, HFI_BUFFER_OUTPUT, &bufreq);
> +	if (ret)
> +		return ret;
> +
> +	if (inst->num_output_bufs < bufreq.count_actual ||
> +	    inst->num_output_bufs < bufreq.count_min)
> +		return -EINVAL;
> +
> +	ret = vidc_get_bufreq(inst, HFI_BUFFER_INPUT, &bufreq);
> +	if (ret)
> +		return ret;
> +
> +	if (inst->num_input_bufs < bufreq.count_min)
> +		return -EINVAL;
> +
> +	return 0;
> +}
> +
> +static int vdec_start_streaming(struct vb2_queue *q, unsigned int count)
> +{
> +	struct vidc_inst *inst = vb2_get_drv_priv(q);
> +	struct hfi_core *hfi = &inst->core->hfi;
> +	struct device *dev = inst->core->dev;
> +	struct hfi_buffer_requirements bufreq;
> +	struct hfi_buffer_count_actual buf_count;
> +	struct vb2_queue *other_queue;
> +	u32 ptype;
> +	int ret;
> +
> +	if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
> +		other_queue = &inst->bufq_cap;
> +	else
> +		other_queue = &inst->bufq_out;
> +
> +	if (!vb2_is_streaming(other_queue))
> +		return 0;
> +
> +	inst->in_reconfig = false;
> +	inst->sequence = 0;
> +
> +	ret = pm_runtime_get_sync(dev);
> +	if (ret < 0)
> +		return ret;

On error start_streaming should call vb2_buffer_done with state VB2_BUF_STATE_QUEUED
for all buffers that are queued in the driver.

Basically the same what happens in stop_streaming, just with a different state.

This ensures that the buffers are given back to vb2 on start_streaming failure.

> +
> +	ret = vdec_init_session(inst);
> +	if (ret)
> +		goto put_sync;
> +
> +	ret = vdec_set_properties(inst);
> +	if (ret)
> +		goto deinit_sess;
> +
> +	ret = vdec_check_configuration(inst);
> +	if (ret)
> +		goto deinit_sess;
> +
> +	ptype = HFI_PROPERTY_PARAM_BUFFER_COUNT_ACTUAL;
> +	buf_count.type = HFI_BUFFER_INPUT;
> +	buf_count.count_actual = inst->num_input_bufs;
> +
> +	ret = vidc_hfi_session_set_property(hfi, inst->hfi_inst,
> +					    ptype, &buf_count);
> +	if (ret)
> +		goto deinit_sess;
> +
> +	ret = vidc_get_bufreq(inst, HFI_BUFFER_OUTPUT, &bufreq);
> +	if (ret)
> +		goto deinit_sess;
> +
> +	ptype = HFI_PROPERTY_PARAM_BUFFER_COUNT_ACTUAL;
> +	buf_count.type = HFI_BUFFER_OUTPUT;
> +	buf_count.count_actual = inst->num_output_bufs;
> +
> +	ret = vidc_hfi_session_set_property(hfi, inst->hfi_inst,
> +					    ptype, &buf_count);
> +	if (ret)
> +		goto deinit_sess;
> +
> +	if (inst->num_output_bufs != bufreq.count_actual) {
> +		struct hfi_buffer_display_hold_count_actual display;
> +
> +		ptype = HFI_PROPERTY_PARAM_BUFFER_DISPLAY_HOLD_COUNT_ACTUAL;
> +		display.type = HFI_BUFFER_OUTPUT;
> +		display.hold_count = inst->num_output_bufs -
> +				     bufreq.count_actual;
> +
> +		ret = vidc_hfi_session_set_property(hfi, inst->hfi_inst,
> +						    ptype, &display);
> +		if (ret)
> +			goto deinit_sess;
> +	}
> +
> +	ret = vidc_vb2_start_streaming(inst);
> +	if (ret)
> +		goto deinit_sess;
> +
> +	return 0;
> +
> +deinit_sess:
> +	vidc_hfi_session_deinit(hfi, inst->hfi_inst);
> +put_sync:
> +	pm_runtime_put_sync(dev);
> +	return ret;
> +}
> +
> +static const struct vb2_ops vdec_vb2_ops = {
> +	.queue_setup = vdec_queue_setup,
> +	.buf_init = vidc_vb2_buf_init,
> +	.buf_prepare = vidc_vb2_buf_prepare,
> +	.start_streaming = vdec_start_streaming,
> +	.stop_streaming = vidc_vb2_stop_streaming,
> +	.buf_queue = vidc_vb2_buf_queue,
> +};
> +
> +static int vdec_empty_buf_done(struct hfi_inst *hfi_inst, u32 addr,
> +			       u32 bytesused, u32 data_offset, u32 flags)
> +{
> +	struct vidc_inst *inst = hfi_inst->ops_priv;
> +	struct vb2_v4l2_buffer *vbuf;
> +	struct vb2_buffer *vb;
> +
> +	vbuf = vidc_vb2_find_buf(inst, addr);
> +	if (!vbuf)
> +		return -EINVAL;
> +
> +	vb = &vbuf->vb2_buf;
> +	vbuf->flags = flags;

Shouldn't timestamp and sequence be filled in here?

> +
> +	vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
> +
> +	return 0;
> +}
> +
> +static int vdec_fill_buf_done(struct hfi_inst *hfi_inst, u32 addr,
> +			      u32 bytesused, u32 data_offset, u32 flags,
> +			      struct timeval *timestamp)
> +{
> +	struct vidc_inst *inst = hfi_inst->ops_priv;
> +	struct vb2_v4l2_buffer *vbuf;
> +	struct vb2_buffer *vb;
> +
> +	vbuf = vidc_vb2_find_buf(inst, addr);
> +	if (!vbuf)
> +		return -EINVAL;
> +
> +	vb = &vbuf->vb2_buf;
> +	vb->planes[0].bytesused = bytesused;
> +	vb->planes[0].data_offset = data_offset;
> +	vb->timestamp = timeval_to_ns(timestamp);
> +	vbuf->flags = flags;
> +	vbuf->sequence = inst->sequence++;
> +
> +	vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
> +
> +	if (vbuf->flags & V4L2_BUF_FLAG_LAST) {
> +		const struct v4l2_event ev = {
> +			.type = V4L2_EVENT_EOS
> +		};
> +
> +		v4l2_event_queue_fh(&inst->fh, &ev);
> +	}
> +
> +	return 0;
> +}
> +
> +static int vdec_event_notify(struct hfi_inst *hfi_inst, u32 event,
> +			     struct hfi_event_data *data)
> +{
> +	struct vidc_inst *inst = hfi_inst->ops_priv;
> +	struct device *dev = inst->core->dev;
> +	const struct v4l2_event ev = { .type = V4L2_EVENT_SOURCE_CHANGE };
> +
> +	switch (event) {
> +	case EVT_SESSION_ERROR:
> +		if (hfi_inst) {
> +			mutex_lock(&hfi_inst->lock);
> +			inst->hfi_inst->state = INST_INVALID;
> +			mutex_unlock(&hfi_inst->lock);
> +		}
> +		dev_err(dev, "dec: event session error (inst:%p)\n", hfi_inst);
> +		break;
> +	case EVT_SYS_EVENT_CHANGE:
> +		switch (data->event_type) {
> +		case HFI_EVENT_DATA_SEQUENCE_CHANGED_SUFFICIENT_BUF_RESOURCES:
> +			dev_dbg(dev, "event sufficient resources\n");
> +			break;
> +		case HFI_EVENT_DATA_SEQUENCE_CHANGED_INSUFFICIENT_BUF_RESOURCES:
> +			inst->reconfig_height = data->height;
> +			inst->reconfig_width = data->width;
> +			inst->in_reconfig = true;
> +
> +			v4l2_event_queue_fh(&inst->fh, &ev);
> +
> +			dev_dbg(dev, "event not sufficient resources (%ux%u)\n",
> +				data->width, data->height);
> +			break;
> +		default:
> +			break;
> +		}
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct hfi_inst_ops vdec_hfi_ops = {
> +	.empty_buf_done = vdec_empty_buf_done,
> +	.fill_buf_done = vdec_fill_buf_done,
> +	.event_notify = vdec_event_notify,
> +};
> +
> +static void vdec_inst_init(struct vidc_inst *inst)
> +{
> +	struct hfi_inst *hfi_inst = inst->hfi_inst;
> +
> +	inst->fmt_out = &vdec_formats[6];
> +	inst->fmt_cap = &vdec_formats[0];
> +	inst->width = 1280;
> +	inst->height = ALIGN(720, 32);
> +	inst->out_width = 1280;
> +	inst->out_height = 720;
> +	inst->fps = 30;
> +	inst->timeperframe.numerator = 1;
> +	inst->timeperframe.denominator = 30;
> +
> +	hfi_inst->width.min = 64;
> +	hfi_inst->width.max = 1920;
> +	hfi_inst->width.step_size = 1;
> +	hfi_inst->height.min = 64;
> +	hfi_inst->height.max = ALIGN(1080, 32);
> +	hfi_inst->height.step_size = 1;
> +	hfi_inst->framerate.min = 1;
> +	hfi_inst->framerate.max = 30;
> +	hfi_inst->framerate.step_size = 1;
> +	hfi_inst->mbs_per_frame.min = 16;
> +	hfi_inst->mbs_per_frame.max = 8160;
> +}
> +
> +int vdec_init(struct vidc_core *core, struct video_device *dec,
> +	      const struct v4l2_file_operations *fops)
> +{
> +	int ret;
> +
> +	dec->release = video_device_release_empty;

I think this is wrong. Since you're using video_device_alloc, this should point to
video_device_release. Otherwise the struct is never freed.

> +	dec->fops = fops;
> +	dec->ioctl_ops = &vdec_ioctl_ops;
> +	dec->vfl_dir = VFL_DIR_M2M;
> +	dec->v4l2_dev = &core->v4l2_dev;
> +	dec->device_caps = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING;
> +
> +	ret = video_register_device(dec, VFL_TYPE_GRABBER, -1);
> +	if (ret)
> +		return ret;
> +
> +	video_set_drvdata(dec, core);
> +
> +	return 0;
> +}
> +
> +void vdec_deinit(struct vidc_core *core, struct video_device *dec)
> +{
> +	video_unregister_device(dec);
> +}
> +
> +int vdec_open(struct vidc_inst *inst)
> +{
> +	struct hfi_core *hfi = &inst->core->hfi;
> +	struct vb2_queue *q;
> +	int ret;
> +
> +	ret = vdec_ctrl_init(inst);
> +	if (ret)
> +		return ret;
> +
> +	inst->hfi_inst = vidc_hfi_session_create(hfi, &vdec_hfi_ops, inst);
> +	if (IS_ERR(inst->hfi_inst)) {
> +		ret = PTR_ERR(inst->hfi_inst);
> +		goto err_ctrl_deinit;
> +	}
> +
> +	vdec_inst_init(inst);
> +
> +	q = &inst->bufq_cap;
> +	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> +	q->io_modes = VB2_MMAP | VB2_DMABUF;
> +	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> +	q->ops = &vdec_vb2_ops;
> +	q->mem_ops = &vb2_dma_sg_memops;
> +	q->drv_priv = inst;
> +	q->buf_struct_size = sizeof(struct vidc_buffer);
> +	q->allow_zero_bytesused = 1;
> +	q->dev = inst->core->dev;
> +	ret = vb2_queue_init(q);
> +	if (ret)
> +		goto err_session_destroy;
> +
> +	q = &inst->bufq_out;
> +	q->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
> +	q->io_modes = VB2_MMAP | VB2_DMABUF;
> +	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> +	q->ops = &vdec_vb2_ops;
> +	q->mem_ops = &vb2_dma_sg_memops;
> +	q->drv_priv = inst;
> +	q->buf_struct_size = sizeof(struct vidc_buffer);
> +	q->allow_zero_bytesused = 1;
> +	q->dev = inst->core->dev;
> +	ret = vb2_queue_init(q);
> +	if (ret)
> +		goto err_cap_queue_release;
> +
> +	return 0;
> +
> +err_cap_queue_release:
> +	vb2_queue_release(&inst->bufq_cap);
> +err_session_destroy:
> +	vidc_hfi_session_destroy(hfi, inst->hfi_inst);
> +	inst->hfi_inst = NULL;
> +err_ctrl_deinit:
> +	vdec_ctrl_deinit(inst);
> +	return ret;
> +}
> +
> +void vdec_close(struct vidc_inst *inst)
> +{
> +	struct hfi_core *hfi = &inst->core->hfi;
> +
> +	vb2_queue_release(&inst->bufq_out);
> +	vb2_queue_release(&inst->bufq_cap);
> +	vdec_ctrl_deinit(inst);
> +	vidc_hfi_session_destroy(hfi, inst->hfi_inst);
> +}

Regards,

	Hans

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