drivers/staging/media/atomisp/pci/runtime/ifmtr/src/ifmtr.c

Source file repositories/reference/linux-study-clean/drivers/staging/media/atomisp/pci/runtime/ifmtr/src/ifmtr.c

File Facts

System: Linux kernel
Corpus path: drivers/staging/media/atomisp/pci/runtime/ifmtr/src/ifmtr.c
Extension: .c
Size: 16771 bytes
Lines: 531
Domain: Driver Families
Bucket: drivers/staging
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.

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.
Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

linux/math.h
system_global.h
ia_css_ifmtr.h
math_support.h
sh_css_internal.h
input_formatter.h
assert_support.h
sh_css_sp.h
isp/modes/interface/input_buf.isp.h

Detected Declarations

function ia_css_ifmtr_lines_needed_for_bayer_order
function ia_css_ifmtr_columns_needed_for_bayer_order
function ia_css_ifmtr_configure
function ifmtr_set_if_blocking_mode
function ifmtr_start_column
function ifmtr_input_start_line

Annotated Snippet

if (two_ppc) {
			vmem_increment = 1;
			deinterleaving = 1;
			deinterleaving_b = 1;
			/* half lines */
			width_a = cropped_width * deinterleaving / 2;
			width_b_factor = 2;
			/* full lines */
			width_b = width_a * width_b_factor;
			buffer_width *= deinterleaving * 2;
			/* Patch from bayer to yuv */
			num_vectors *= deinterleaving;
			buf_offset_b = buffer_width / 2 / ISP_VEC_NELEMS;
			vectors_per_line = num_vectors / buffer_height;
			/* Even lines are half size */
			line_width = vectors_per_line *
				     input_formatter_get_alignment(INPUT_FORMATTER0_ID) /
				     2;
			start_column /= 2;
		} else {
			vmem_increment = 1;
			deinterleaving = 3;
			width_a = cropped_width * deinterleaving / 2;
			buffer_width = buffer_width * deinterleaving / 2;
			/* Patch from bayer to yuv */
			num_vectors = num_vectors / 2 * deinterleaving;
			start_column = start_column * deinterleaving / 2;
		}
		break;
	case ATOMISP_INPUT_FORMAT_YUV420_8:
	case ATOMISP_INPUT_FORMAT_YUV420_10:
	case ATOMISP_INPUT_FORMAT_YUV420_16:
		if (two_ppc) {
			vmem_increment = 1;
			deinterleaving = 1;
			width_a = width_b = cropped_width * deinterleaving / 2;
			buffer_width *= deinterleaving * 2;
			num_vectors *= deinterleaving;
			buf_offset_b = buffer_width / 2 / ISP_VEC_NELEMS;
			vectors_per_line = num_vectors / buffer_height;
			/* Even lines are half size */
			line_width = vectors_per_line *
				     input_formatter_get_alignment(INPUT_FORMATTER0_ID) /
				     2;
			start_column *= deinterleaving;
			start_column /= 2;
			start_column_b = start_column;
		} else {
			vmem_increment = 1;
			deinterleaving = 1;
			width_a = cropped_width * deinterleaving;
			buffer_width *= deinterleaving * 2;
			num_vectors *= deinterleaving;
			start_column *= deinterleaving;
		}
		break;
	case ATOMISP_INPUT_FORMAT_YUV422_8:
	case ATOMISP_INPUT_FORMAT_YUV422_10:
	case ATOMISP_INPUT_FORMAT_YUV422_16:
		if (two_ppc) {
			vmem_increment = 1;
			deinterleaving = 1;
			width_a = width_b = cropped_width * deinterleaving;
			buffer_width *= deinterleaving * 2;
			num_vectors *= deinterleaving;
			start_column *= deinterleaving;
			buf_offset_b = buffer_width / 2 / ISP_VEC_NELEMS;
			start_column_b = start_column;
		} else {
			vmem_increment = 1;
			deinterleaving = 2;
			width_a = cropped_width * deinterleaving;
			buffer_width *= deinterleaving;
			num_vectors *= deinterleaving;
			start_column *= deinterleaving;
		}
		break;
	case ATOMISP_INPUT_FORMAT_RGB_444:
	case ATOMISP_INPUT_FORMAT_RGB_555:
	case ATOMISP_INPUT_FORMAT_RGB_565:
	case ATOMISP_INPUT_FORMAT_RGB_666:
	case ATOMISP_INPUT_FORMAT_RGB_888:
		num_vectors *= 2;
		if (two_ppc) {
			deinterleaving = 2;	/* BR in if_a, G in if_b */
			deinterleaving_b = 1;	/* BR in if_a, G in if_b */
			buffers_per_line = 4;
			start_column_b = start_column;
			start_column *= deinterleaving;
			start_column_b *= deinterleaving_b;

Annotation

Immediate include surface: `linux/math.h`, `system_global.h`, `ia_css_ifmtr.h`, `math_support.h`, `sh_css_internal.h`, `input_formatter.h`, `assert_support.h`, `sh_css_sp.h`.
Detected declarations: `function ia_css_ifmtr_lines_needed_for_bayer_order`, `function ia_css_ifmtr_columns_needed_for_bayer_order`, `function ia_css_ifmtr_configure`, `function ifmtr_set_if_blocking_mode`, `function ifmtr_start_column`, `function ifmtr_input_start_line`.
Atlas domain: Driver Families / drivers/staging.
Implementation status: source implementation candidate.

Implementation Notes

This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.