drivers/media/platform/qcom/camss/camss-vfe-gen1.c

Source file repositories/reference/linux-study-clean/drivers/media/platform/qcom/camss/camss-vfe-gen1.c

File Facts

System
Linux kernel
Corpus path
drivers/media/platform/qcom/camss/camss-vfe-gen1.c
Extension
.c
Size
18692 bytes
Lines
744
Domain
Driver Families
Bucket
drivers/media
Inferred role
Driver Families: implementation source
Status
source 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

if (wm_idx < 0) {
			dev_err(vfe->camss->dev, "Can not reserve wm\n");
			goto error_get_wm;
		}
		output->wm_idx[i] = wm_idx;
	}

	output->drop_update_idx = 0;

	spin_unlock_irqrestore(&vfe->output_lock, flags);

	return 0;

error_get_wm:
	for (i--; i >= 0; i--)
		vfe_release_wm(vfe, output->wm_idx[i]);
	output->state = VFE_OUTPUT_OFF;
error:
	spin_unlock_irqrestore(&vfe->output_lock, flags);

	return -EINVAL;
}

int vfe_gen1_enable(struct vfe_line *line)
{
	struct vfe_device *vfe = to_vfe(line);
	int ret;

	mutex_lock(&vfe->stream_lock);

	if (!vfe->stream_count) {
		vfe->ops_gen1->enable_irq_common(vfe);
		vfe->ops_gen1->bus_enable_wr_if(vfe, 1);
		vfe->ops_gen1->set_qos(vfe);
		vfe->ops_gen1->set_ds(vfe);
	}

	vfe->stream_count++;

	mutex_unlock(&vfe->stream_lock);

	ret = vfe_get_output(line);
	if (ret < 0)
		goto error_get_output;

	ret = vfe_enable_output(line);
	if (ret < 0)
		goto error_enable_output;

	vfe->was_streaming = 1;

	return 0;

error_enable_output:
	vfe_put_output(line);

error_get_output:
	mutex_lock(&vfe->stream_lock);

	if (vfe->stream_count == 1)
		vfe->ops_gen1->bus_enable_wr_if(vfe, 0);

	vfe->stream_count--;

	mutex_unlock(&vfe->stream_lock);

	return ret;
}

static void vfe_output_update_ping_addr(struct vfe_device *vfe,
					struct vfe_output *output, u8 sync,
					struct vfe_line *line)
{
	u32 addr;
	unsigned int i;

	for (i = 0; i < output->wm_num; i++) {
		if (output->buf[0])
			addr = output->buf[0]->addr[i];
		else
			addr = 0;

		vfe->ops_gen1->wm_set_ping_addr(vfe, output->wm_idx[i], addr);
		if (sync)
			vfe->ops_gen1->bus_reload_wm(vfe, output->wm_idx[i]);
	}
}

static void vfe_output_update_pong_addr(struct vfe_device *vfe,
					struct vfe_output *output, u8 sync,

Annotation

Implementation Notes