drivers/staging/media/meson/vdec/vdec_helpers.c

Source file repositories/reference/linux-study-clean/drivers/staging/media/meson/vdec/vdec_helpers.c

File Facts

System
Linux kernel
Corpus path
drivers/staging/media/meson/vdec/vdec_helpers.c
Extension
.c
Size
12656 bytes
Lines
481
Domain
Driver Families
Bucket
drivers/staging
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

switch (pixfmt) {
		case V4L2_PIX_FMT_NV12M:
			ret = set_canvas_nv12m(sess, &buf->vb.vb2_buf, width,
					       height, reg_cur);
			if (ret)
				return ret;
			break;
		case V4L2_PIX_FMT_YUV420M:
			ret = set_canvas_yuv420m(sess, &buf->vb.vb2_buf, width,
						 height, reg_cur);
			if (ret)
				return ret;
			break;
		default:
			dev_err(sess->core->dev, "Unsupported pixfmt %08X\n",
				pixfmt);
			return -EINVAL;
		}

		reg_num_cur++;
		if (reg_num_cur >= reg_num[reg_base_cur]) {
			reg_base_cur++;
			reg_num_cur = 0;
		}

		sess->fw_idx_to_vb2_idx[i++] = buf->vb.vb2_buf.index;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(amvdec_set_canvases);

int amvdec_add_ts(struct amvdec_session *sess, u64 ts,
		  struct v4l2_timecode tc, u32 offset, u32 vbuf_flags)
{
	struct amvdec_timestamp *new_ts;
	unsigned long flags;

	new_ts = kzalloc_obj(*new_ts);
	if (!new_ts)
		return -ENOMEM;

	new_ts->ts = ts;
	new_ts->tc = tc;
	new_ts->offset = offset;
	new_ts->flags = vbuf_flags;

	spin_lock_irqsave(&sess->ts_spinlock, flags);
	list_add_tail(&new_ts->list, &sess->timestamps);
	spin_unlock_irqrestore(&sess->ts_spinlock, flags);
	return 0;
}
EXPORT_SYMBOL_GPL(amvdec_add_ts);

void amvdec_remove_ts(struct amvdec_session *sess, u64 ts)
{
	struct amvdec_timestamp *tmp;
	unsigned long flags;

	spin_lock_irqsave(&sess->ts_spinlock, flags);
	list_for_each_entry(tmp, &sess->timestamps, list) {
		if (tmp->ts == ts) {
			list_del(&tmp->list);
			kfree(tmp);
			goto unlock;
		}
	}
	dev_warn(sess->core->dev_dec,
		 "Couldn't remove buffer with timestamp %llu from list\n", ts);

unlock:
	spin_unlock_irqrestore(&sess->ts_spinlock, flags);
}
EXPORT_SYMBOL_GPL(amvdec_remove_ts);

static void dst_buf_done(struct amvdec_session *sess,
			 struct vb2_v4l2_buffer *vbuf,
			 u32 field, u64 timestamp,
			 struct v4l2_timecode timecode, u32 flags)
{
	struct device *dev = sess->core->dev_dec;
	u32 output_size = amvdec_get_output_size(sess);

	switch (sess->pixfmt_cap) {
	case V4L2_PIX_FMT_NV12M:
		vb2_set_plane_payload(&vbuf->vb2_buf, 0, output_size);
		vb2_set_plane_payload(&vbuf->vb2_buf, 1, output_size / 2);
		break;
	case V4L2_PIX_FMT_YUV420M:
		vb2_set_plane_payload(&vbuf->vb2_buf, 0, output_size);

Annotation

Implementation Notes