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SubjectRe: [PATCH 6/9] [media] s5p-jpeg: Add support for resolution change event
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Hi Thierry,

On 06/02/2017 06:02 PM, Thierry Escande wrote:
> From: henryhsu <henryhsu@chromium.org>
>
> This patch adds support for resolution change event to notify clients so
> they can prepare correct output buffer. When resolution change happened,
> G_FMT for CAPTURE should return old resolution and format before CAPTURE
> queues streamoff.

Do you have a use case for that?

>
> Signed-off-by: Henry-Ruey Hsu <henryhsu@chromium.org>
> Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
> ---
> drivers/media/platform/s5p-jpeg/jpeg-core.c | 121 ++++++++++++++++++++--------
> drivers/media/platform/s5p-jpeg/jpeg-core.h | 7 ++
> 2 files changed, 95 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/media/platform/s5p-jpeg/jpeg-core.c b/drivers/media/platform/s5p-jpeg/jpeg-core.c
> index 5569b99..7a7acbc 100644
> --- a/drivers/media/platform/s5p-jpeg/jpeg-core.c
> +++ b/drivers/media/platform/s5p-jpeg/jpeg-core.c
> @@ -24,6 +24,7 @@
> #include <linux/slab.h>
> #include <linux/spinlock.h>
> #include <linux/string.h>
> +#include <media/v4l2-event.h>
> #include <media/v4l2-mem2mem.h>
> #include <media/v4l2-ioctl.h>
> #include <media/videobuf2-v4l2.h>
> @@ -1416,8 +1417,17 @@ static int s5p_jpeg_g_fmt(struct file *file, void *priv, struct v4l2_format *f)
> q_data = get_q_data(ct, f->type);
> BUG_ON(q_data == NULL);
>
> - pix->width = q_data->w;
> - pix->height = q_data->h;
> + if ((f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE &&
> + ct->mode == S5P_JPEG_ENCODE) ||
> + (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT &&
> + ct->mode == S5P_JPEG_DECODE)) {
> + pix->width = 0;
> + pix->height = 0;
> + } else {
> + pix->width = q_data->w;
> + pix->height = q_data->h;
> + }
> +

Is this change related to the patch subject?

> pix->field = V4L2_FIELD_NONE;
> pix->pixelformat = q_data->fmt->fourcc;
> pix->bytesperline = 0;
> @@ -1677,8 +1687,6 @@ static int s5p_jpeg_s_fmt(struct s5p_jpeg_ctx *ct, struct v4l2_format *f)
> FMT_TYPE_OUTPUT : FMT_TYPE_CAPTURE;
>
> q_data->fmt = s5p_jpeg_find_format(ct, pix->pixelformat, f_type);
> - q_data->w = pix->width;
> - q_data->h = pix->height;
> if (q_data->fmt->fourcc != V4L2_PIX_FMT_JPEG) {
> /*
> * During encoding Exynos4x12 SoCs access wider memory area
> @@ -1686,6 +1694,8 @@ static int s5p_jpeg_s_fmt(struct s5p_jpeg_ctx *ct, struct v4l2_format *f)
> * the JPEG_IMAGE_SIZE register. In order to avoid sysmmu
> * page fault calculate proper buffer size in such a case.
> */
> + q_data->w = pix->width;
> + q_data->h = pix->height;
> if (ct->jpeg->variant->hw_ex4_compat &&
> f_type == FMT_TYPE_OUTPUT && ct->mode == S5P_JPEG_ENCODE)
> q_data->size = exynos4_jpeg_get_output_buffer_size(ct,
> @@ -1761,6 +1771,15 @@ static int s5p_jpeg_s_fmt_vid_out(struct file *file, void *priv,
> return s5p_jpeg_s_fmt(fh_to_ctx(priv), f);
> }
>
> +static int s5p_jpeg_subscribe_event(struct v4l2_fh *fh,
> + const struct v4l2_event_subscription *sub)
> +{
> + if (sub->type == V4L2_EVENT_SOURCE_CHANGE)
> + return v4l2_src_change_event_subscribe(fh, sub);
> +
> + return -EINVAL;
> +}
> +
> static int exynos3250_jpeg_try_downscale(struct s5p_jpeg_ctx *ctx,
> struct v4l2_rect *r)
> {
> @@ -2086,6 +2105,9 @@ static const struct v4l2_ioctl_ops s5p_jpeg_ioctl_ops = {
>
> .vidioc_g_selection = s5p_jpeg_g_selection,
> .vidioc_s_selection = s5p_jpeg_s_selection,
> +
> + .vidioc_subscribe_event = s5p_jpeg_subscribe_event,
> + .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> };
>
> /*
> @@ -2478,8 +2500,17 @@ static int s5p_jpeg_job_ready(void *priv)
> {
> struct s5p_jpeg_ctx *ctx = priv;
>
> - if (ctx->mode == S5P_JPEG_DECODE)
> + if (ctx->mode == S5P_JPEG_DECODE) {
> + /*
> + * We have only one input buffer and one output buffer. If there
> + * is a resolution change event, no need to continue decoding.
> + */
> + if (ctx->state == JPEGCTX_RESOLUTION_CHANGE)
> + return 0;
> +
> return ctx->hdr_parsed;
> + }
> +
> return 1;
> }
>
> @@ -2558,6 +2589,21 @@ static int s5p_jpeg_buf_prepare(struct vb2_buffer *vb)
> return 0;
> }
>
> +static void s5p_jpeg_set_capture_queue_data(struct s5p_jpeg_ctx *ctx)
> +{
> + struct s5p_jpeg_q_data *q_data = &ctx->cap_q;
> +
> + q_data->w = ctx->out_q.w;
> + q_data->h = ctx->out_q.h;
> +
> + jpeg_bound_align_image(ctx, &q_data->w, S5P_JPEG_MIN_WIDTH,
> + S5P_JPEG_MAX_WIDTH, q_data->fmt->h_align,
> + &q_data->h, S5P_JPEG_MIN_HEIGHT,
> + S5P_JPEG_MAX_HEIGHT, q_data->fmt->v_align);
> +
> + q_data->size = q_data->w * q_data->h * q_data->fmt->depth >> 3;
> +}
> +
> static void s5p_jpeg_buf_queue(struct vb2_buffer *vb)
> {
> struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> @@ -2565,9 +2611,20 @@ static void s5p_jpeg_buf_queue(struct vb2_buffer *vb)
>
> if (ctx->mode == S5P_JPEG_DECODE &&
> vb->vb2_queue->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) {
> - struct s5p_jpeg_q_data tmp, *q_data;
> -
> - ctx->hdr_parsed = s5p_jpeg_parse_hdr(&tmp,
> + static const struct v4l2_event ev_src_ch = {
> + .type = V4L2_EVENT_SOURCE_CHANGE,
> + .u.src_change.changes = V4L2_EVENT_SRC_CH_RESOLUTION,
> + };
> + struct vb2_queue *dst_vq;
> + u32 ori_w;
> + u32 ori_h;
> +
> + dst_vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx,
> + V4L2_BUF_TYPE_VIDEO_CAPTURE);
> + ori_w = ctx->out_q.w;
> + ori_h = ctx->out_q.h;
> +
> + ctx->hdr_parsed = s5p_jpeg_parse_hdr(&ctx->out_q,
> (unsigned long)vb2_plane_vaddr(vb, 0),
> min((unsigned long)ctx->out_q.size,
> vb2_get_plane_payload(vb, 0)), ctx);
> @@ -2576,31 +2633,18 @@ static void s5p_jpeg_buf_queue(struct vb2_buffer *vb)
> return;
> }
>
> - q_data = &ctx->out_q;
> - q_data->w = tmp.w;
> - q_data->h = tmp.h;
> - q_data->sos = tmp.sos;
> - memcpy(q_data->dht.marker, tmp.dht.marker,
> - sizeof(tmp.dht.marker));
> - memcpy(q_data->dht.len, tmp.dht.len, sizeof(tmp.dht.len));
> - q_data->dht.n = tmp.dht.n;
> - memcpy(q_data->dqt.marker, tmp.dqt.marker,
> - sizeof(tmp.dqt.marker));
> - memcpy(q_data->dqt.len, tmp.dqt.len, sizeof(tmp.dqt.len));
> - q_data->dqt.n = tmp.dqt.n;
> - q_data->sof = tmp.sof;
> - q_data->sof_len = tmp.sof_len;

You're removing here quantization and Huffman table info, is it
intentional?

> -
> - q_data = &ctx->cap_q;
> - q_data->w = tmp.w;
> - q_data->h = tmp.h;
> -
> - jpeg_bound_align_image(ctx, &q_data->w, S5P_JPEG_MIN_WIDTH,
> - S5P_JPEG_MAX_WIDTH, q_data->fmt->h_align,
> - &q_data->h, S5P_JPEG_MIN_HEIGHT,
> - S5P_JPEG_MAX_HEIGHT, q_data->fmt->v_align
> - );
> - q_data->size = q_data->w * q_data->h * q_data->fmt->depth >> 3;
> + /*
> + * If there is a resolution change event, only update capture
> + * queue when it is not streaming. Otherwise, update it in
> + * STREAMOFF. See s5p_jpeg_stop_streaming for detail.
> + */
> + if (ctx->out_q.w != ori_w || ctx->out_q.h != ori_h) {
> + v4l2_event_queue_fh(&ctx->fh, &ev_src_ch);
> + if (vb2_is_streaming(dst_vq))
> + ctx->state = JPEGCTX_RESOLUTION_CHANGE;
> + else
> + s5p_jpeg_set_capture_queue_data(ctx);
> + }
> }
>
> v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
> @@ -2620,6 +2664,17 @@ static void s5p_jpeg_stop_streaming(struct vb2_queue *q)
> {
> struct s5p_jpeg_ctx *ctx = vb2_get_drv_priv(q);
>
> + /*
> + * STREAMOFF is an acknowledgment for resolution change event.
> + * Before STREAMOFF, we still have to return the old resolution and
> + * subsampling. Update capture queue when the stream is off.
> + */
> + if (ctx->state == JPEGCTX_RESOLUTION_CHANGE &&
> + q->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
> + s5p_jpeg_set_capture_queue_data(ctx);
> + ctx->state = JPEGCTX_RUNNING;
> + }
> +
> pm_runtime_put(ctx->jpeg->dev);
> }
>
> diff --git a/drivers/media/platform/s5p-jpeg/jpeg-core.h b/drivers/media/platform/s5p-jpeg/jpeg-core.h
> index 4492a35..9aa26bd 100644
> --- a/drivers/media/platform/s5p-jpeg/jpeg-core.h
> +++ b/drivers/media/platform/s5p-jpeg/jpeg-core.h
> @@ -98,6 +98,11 @@ enum exynos4_jpeg_img_quality_level {
> QUALITY_LEVEL_4, /* low */
> };
>
> +enum s5p_jpeg_ctx_state {
> + JPEGCTX_RUNNING = 0,
> + JPEGCTX_RESOLUTION_CHANGE,
> +};
> +
> /**
> * struct s5p_jpeg - JPEG IP abstraction
> * @lock: the mutex protecting this structure
> @@ -220,6 +225,7 @@ struct s5p_jpeg_q_data {
> * @hdr_parsed: set if header has been parsed during decompression
> * @crop_altered: set if crop rectangle has been altered by the user space
> * @ctrl_handler: controls handler
> + * @state: state of the context
> */
> struct s5p_jpeg_ctx {
> struct s5p_jpeg *jpeg;
> @@ -235,6 +241,7 @@ struct s5p_jpeg_ctx {
> bool hdr_parsed;
> bool crop_altered;
> struct v4l2_ctrl_handler ctrl_handler;
> + enum s5p_jpeg_ctx_state state;
> };
>
> /**
>

--
Best regards,
Jacek Anaszewski

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