drivers/video/fbdev/via/hw.c

File Facts

System

Linux kernel

Corpus path

drivers/video/fbdev/via/hw.c

Extension

.c

Size

59334 bytes

Lines

2120

Domain

Driver Families

Bucket

drivers/video

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/via-core.h
• global.h
• via_clock.h

Detected Declarations

• function viafb_lock_crt
• function viafb_unlock_crt
• function write_dac_reg
• function get_dvi_devices
• function get_lcd_devices
• function viafb_set_iga_path
• function set_color_register
• function viafb_set_primary_color_register
• function viafb_set_secondary_color_register
• function set_source_common
• function set_crt_source
• function set_ldvp0_source
• function set_ldvp1_source
• function set_dvp0_source
• function set_dvp1_source
• function set_lvds1_source
• function set_lvds2_source
• function via_set_source
• function set_crt_state
• function set_dvp0_state
• function set_dvp1_state
• function set_lvds1_state
• function set_lvds2_state
• function via_set_state
• function via_set_sync_polarity
• function via_parse_odev
• function via_odev_to_seq
• function load_fix_bit_crtc_reg
• function viafb_load_reg
• function viafb_write_regx
• function viafb_load_fetch_count_reg
• function viafb_load_FIFO_reg
• function get_pll_config
• function get_best_pll_config
• function viafb_set_vclock
• function var_to_timing
• function viafb_fill_crtc_timing
• function viafb_init_chip_info
• function viafb_update_device_setting
• function init_gfx_chip_info
• function init_tmds_chip_info
• function init_lvds_chip_info
• function viafb_init_dac
• function device_screen_off
• function device_screen_on
• function set_display_channel
• function get_sync
• function hw_init

Annotated Snippet

if (viafb_CRT_ON) {
			if (viafb_primary_dev == CRT_Device)
				crt_iga_path = IGA1;
			else
				crt_iga_path = IGA2;
		}

		if (viafb_DVI_ON) {
			if (viafb_primary_dev == DVI_Device)
				viaparinfo->tmds_setting_info->iga_path = IGA1;
			else
				viaparinfo->tmds_setting_info->iga_path = IGA2;
		}

		if (viafb_LCD_ON) {
			if (viafb_primary_dev == LCD_Device) {
				if (viafb_dual_fb &&
					(viaparinfo->chip_info->gfx_chip_name ==
					UNICHROME_CLE266)) {
					viaparinfo->
					lvds_setting_info->iga_path = IGA2;
					crt_iga_path = IGA1;
					viaparinfo->
					tmds_setting_info->iga_path = IGA1;
				} else
					viaparinfo->
					lvds_setting_info->iga_path = IGA1;
			} else {
				viaparinfo->lvds_setting_info->iga_path = IGA2;
			}
		}
		if (viafb_LCD2_ON) {
			if (LCD2_Device == viafb_primary_dev)
				viaparinfo->lvds_setting_info2->iga_path = IGA1;
			else
				viaparinfo->lvds_setting_info2->iga_path = IGA2;
		}
	} else {
		viafb_SAMM_ON = 0;

		if (viafb_CRT_ON && viafb_LCD_ON) {
			crt_iga_path = IGA1;
			viaparinfo->lvds_setting_info->iga_path = IGA2;
		} else if (viafb_CRT_ON && viafb_DVI_ON) {
			crt_iga_path = IGA1;
			viaparinfo->tmds_setting_info->iga_path = IGA2;
		} else if (viafb_LCD_ON && viafb_DVI_ON) {
			viaparinfo->tmds_setting_info->iga_path = IGA1;
			viaparinfo->lvds_setting_info->iga_path = IGA2;
		} else if (viafb_LCD_ON && viafb_LCD2_ON) {
			viaparinfo->lvds_setting_info->iga_path = IGA2;
			viaparinfo->lvds_setting_info2->iga_path = IGA2;
		} else if (viafb_CRT_ON) {
			crt_iga_path = IGA1;
		} else if (viafb_LCD_ON) {
			viaparinfo->lvds_setting_info->iga_path = IGA2;
		} else if (viafb_DVI_ON) {
			viaparinfo->tmds_setting_info->iga_path = IGA1;
		}
	}

	viaparinfo->shared->iga1_devices = 0;
	viaparinfo->shared->iga2_devices = 0;
	if (viafb_CRT_ON) {
		if (crt_iga_path == IGA1)
			viaparinfo->shared->iga1_devices |= VIA_CRT;
		else
			viaparinfo->shared->iga2_devices |= VIA_CRT;
	}

	if (viafb_DVI_ON) {
		if (viaparinfo->tmds_setting_info->iga_path == IGA1)
			viaparinfo->shared->iga1_devices |= get_dvi_devices(
				viaparinfo->chip_info->
				tmds_chip_info.output_interface);
		else
			viaparinfo->shared->iga2_devices |= get_dvi_devices(
				viaparinfo->chip_info->
				tmds_chip_info.output_interface);
	}

	if (viafb_LCD_ON) {
		if (viaparinfo->lvds_setting_info->iga_path == IGA1)
			viaparinfo->shared->iga1_devices |= get_lcd_devices(
				viaparinfo->chip_info->
				lvds_chip_info.output_interface);
		else
			viaparinfo->shared->iga2_devices |= get_lcd_devices(
				viaparinfo->chip_info->
				lvds_chip_info.output_interface);

Annotation

• Immediate include surface: `linux/via-core.h`, `global.h`, `via_clock.h`.
• Detected declarations: `function viafb_lock_crt`, `function viafb_unlock_crt`, `function write_dac_reg`, `function get_dvi_devices`, `function get_lcd_devices`, `function viafb_set_iga_path`, `function set_color_register`, `function viafb_set_primary_color_register`, `function viafb_set_secondary_color_register`, `function set_source_common`.
• Atlas domain: Driver Families / drivers/video.
• 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.