drivers/gpu/drm/amd/display/dc/dml/dml1_frl_cap_chk.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/amd/display/dc/dml/dml1_frl_cap_chk.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/amd/display/dc/dml/dml1_frl_cap_chk.c
Extension
.c
Size
28281 bytes
Lines
791
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.

Dependency Surface

Detected Declarations

Annotated Snippet

if (params->pixel_encoding == HDMI_FRL_PIXEL_ENCODING_444) {
			for (i = 0; i < table_size_444 ; i++) {
				if (prim_format_444[i].vic == params->vic) {
					params->borrow_params.hc_active_target = prim_format_444[i].hc_active;
					params->borrow_params.hc_blank_target  = prim_format_444[i].hc_blank;
					hc_active_blank_predefined = true;
					break;
				}
			}
		} else if (params->pixel_encoding == HDMI_FRL_PIXEL_ENCODING_422) {
			for (i = 0; i < table_size_422 ; i++) {
				if (prim_format_422[i].vic == params->vic) {
					params->borrow_params.hc_active_target = prim_format_422[i].hc_active;
					params->borrow_params.hc_blank_target  = prim_format_422[i].hc_blank;
					hc_active_blank_predefined = true;
					break;
				}
			}
		} else if (params->pixel_encoding == HDMI_FRL_PIXEL_ENCODING_420) {
			for (i = 0; i < table_size_420 ; i++) {
				if (prim_format_420[i].vic == params->vic) {
					params->borrow_params.hc_active_target = prim_format_420[i].hc_active;
					params->borrow_params.hc_blank_target  = prim_format_420[i].hc_blank;
					hc_active_blank_predefined = true;
					break;
				}
			}
		}

		if (hc_active_blank_predefined) {
			hc_active_target = params->borrow_params.hc_active_target;
			hc_blank_target = params->borrow_params.hc_blank_target;
		}
	}

	hc_blank_target_est1 = (int)dml_ceil(hc_active_target * ((double)params->h_blank / params->h_active), 1);
	hc_blank_target_est2 = (int)dml_max(hc_blank_target_est1, inter->blank_audio_min);

	if (!hc_active_blank_predefined) {
		if (!params->bypass_hc_target_calc) {
			hc_blank_target = (int)(4 * dml_floor(dml_min(hc_blank_target_est2, c_frl_available - 3.0 / 2.0 * hc_active_target) / 4.0, 1));

			params->borrow_params.hc_active_target = hc_active_target;
			params->borrow_params.hc_blank_target  = hc_blank_target;
		} else {
			hc_blank_target  = params->borrow_params.hc_blank_target;
		}
	}

#ifdef DEBUG_FRL_CAP_CHK
	{
		frl_dump_var("%i", c_frl_available);
		frl_dump_var("%i", c_frl_active_available);
		frl_dump_var("%i", c_frl_blank_available);
		frl_dump_var("%i", bytes_target);
		frl_dump_var("%i", hc_active_target);
		frl_dump_var("%i", hc_blank_target_est1);
		frl_dump_var("%i", hc_blank_target_est2);
		frl_dump_var("%i", hc_blank_target);
	}
#endif

	if (!(inter->blank_audio_min <= hc_blank_target)) {
		frl_dump_var("%i", inter->blank_audio_min);
		frl_dump_var("%i", hc_blank_target);
		return FRL_CAP_CHK_ERROR_AUDIO_BW;
	}

	f_tb_average    = inter->f_pixel_clock_max / (params->h_active + params->h_blank) * (hc_active_target + hc_blank_target);
	t_active_ref    = inter->t_line * ((double)params->h_active / (params->h_active + params->h_blank));
	t_blank_ref     = inter->t_line - t_active_ref; // * ((double) params->h_blank / (params->h_active + params->h_blank));
	t_active_target = dml_max((hc_active_target / f_tb_average),
				  (3.0 / 2.0 * hc_active_target) /
				  (params->lanes * inter->r_frl_char_min * (1.0 - inter->overhead_max)));
	t_blank_target  = inter->t_line - t_active_target;

	tb_borrowed     = t_active_target * f_tb_average - hc_active_target;
#ifdef DEBUG_FRL_CAP_CHK
	tb_delta        = dcn_bw_fabs(t_active_target - t_active_ref) * (hc_active_target + hc_blank_target_est1) / inter->t_line;

	{
		frl_dump_var("%le", f_tb_average);
		frl_dump_var("%le", t_active_ref);
		frl_dump_var("%le", t_blank_ref);
		frl_dump_var("%le", t_active_target);
		frl_dump_var("%le", t_blank_target);
		frl_dump_var("%le", tb_delta);
	}
#endif

Annotation

Implementation Notes