drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20.c

File Facts

System: Linux kernel
Corpus path: drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20.c
Extension: .c
Size: 195098 bytes
Lines: 5118
Domain: Driver Families
Bucket: drivers/gpu
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

../display_mode_lib.h
display_mode_vba_20.h
../dml_inline_defs.h

Detected Declarations

function dml20_recalculate
function adjust_ReturnBW
function dscceComputeDelay
function dscComputeDelay
function CalculatePrefetchSchedule
function RoundToDFSGranularityUp
function RoundToDFSGranularityDown
function CalculatePrefetchSourceLines
function CalculateVMAndRowBytes
function dml20_DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation
function dml20_DisplayPipeConfiguration
function CalculateTWait
function CalculateRemoteSurfaceFlipDelay
function CalculateWriteBackDelay
function CalculateActiveRowBandwidth
function CalculateFlipSchedule
function TruncToValidBPP
function dml20_ModeSupportAndSystemConfigurationFull

Annotated Snippet

if (GPUVMEnable) {
			TimeForFetchingMetaPTE =
					dml_max(
							*Tno_bw
									+ (double) PDEAndMetaPTEBytesFrame
											/ *PrefetchBandwidth,
							dml_max(
									UrgentExtraLatency
											+ UrgentLatencyPixelDataOnly
													* (PageTableLevels
															- 1),
									LineTime / 4));
		} else {
			if (NumberOfCursors > 0 || XFCEnabled)
				TimeForFetchingMetaPTE = LineTime / 4;
			else
				TimeForFetchingMetaPTE = 0.0;
		}

		if ((GPUVMEnable == true || DCCEnable == true)) {
			TimeForFetchingRowInVBlank =
					dml_max(
							(MetaRowByte + PixelPTEBytesPerRow)
									/ *PrefetchBandwidth,
							dml_max(
									UrgentLatencyPixelDataOnly,
									dml_max(
											LineTime
													- TimeForFetchingMetaPTE,
											LineTime
													/ 4.0)));
		} else {
			if (NumberOfCursors > 0 || XFCEnabled)
				TimeForFetchingRowInVBlank = LineTime - TimeForFetchingMetaPTE;
			else
				TimeForFetchingRowInVBlank = 0.0;
		}

		*DestinationLinesToRequestVMInVBlank = dml_floor(
				4.0 * (TimeForFetchingMetaPTE / LineTime + 0.125),
				1) / 4.0;

		*DestinationLinesToRequestRowInVBlank = dml_floor(
				4.0 * (TimeForFetchingRowInVBlank / LineTime + 0.125),
				1) / 4.0;

		LinesToRequestPrefetchPixelData =
				*DestinationLinesForPrefetch
						- ((NumberOfCursors > 0 || GPUVMEnable
								|| DCCEnable) ?
								(*DestinationLinesToRequestVMInVBlank
										+ *DestinationLinesToRequestRowInVBlank) :
								0.0);

		if (LinesToRequestPrefetchPixelData > 0) {

			*VRatioPrefetchY = (double) PrefetchSourceLinesY
					/ LinesToRequestPrefetchPixelData;
			*VRatioPrefetchY = dml_max(*VRatioPrefetchY, 1.0);
			if ((SwathHeightY > 4) && (VInitPreFillY > 3)) {
				if (LinesToRequestPrefetchPixelData > (VInitPreFillY - 3.0) / 2.0) {
					*VRatioPrefetchY =
							dml_max(
									(double) PrefetchSourceLinesY
											/ LinesToRequestPrefetchPixelData,
									(double) MaxNumSwathY
											* SwathHeightY
											/ (LinesToRequestPrefetchPixelData
													- (VInitPreFillY
															- 3.0)
															/ 2.0));
					*VRatioPrefetchY = dml_max(*VRatioPrefetchY, 1.0);
				} else {
					MyError = true;
					*VRatioPrefetchY = 0;
				}
			}

			*VRatioPrefetchC = (double) PrefetchSourceLinesC
					/ LinesToRequestPrefetchPixelData;
			*VRatioPrefetchC = dml_max(*VRatioPrefetchC, 1.0);

			if ((SwathHeightC > 4)) {
				if (LinesToRequestPrefetchPixelData > (VInitPreFillC - 3.0) / 2.0) {
					*VRatioPrefetchC =
							dml_max(
									*VRatioPrefetchC,
									(double) MaxNumSwathC
											* SwathHeightC
											/ (LinesToRequestPrefetchPixelData

Annotation

Immediate include surface: `../display_mode_lib.h`, `display_mode_vba_20.h`, `../dml_inline_defs.h`.
Detected declarations: `function dml20_recalculate`, `function adjust_ReturnBW`, `function dscceComputeDelay`, `function dscComputeDelay`, `function CalculatePrefetchSchedule`, `function RoundToDFSGranularityUp`, `function RoundToDFSGranularityDown`, `function CalculatePrefetchSourceLines`, `function CalculateVMAndRowBytes`, `function dml20_DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation`.
Atlas domain: Driver Families / drivers/gpu.
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.