drivers/video/fbdev/via/dvi.c

Source file repositories/reference/linux-study-clean/drivers/video/fbdev/via/dvi.c

File Facts

System
Linux kernel
Corpus path
drivers/video/fbdev/via/dvi.c
Extension
.c
Size
12629 bytes
Lines
465
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.

Dependency Surface

Detected Declarations

Annotated Snippet

if (check_tmds_chip(VT1632_DEVICE_ID_REG, VT1632_DEVICE_ID)) {
			tmds_register_write(0x08, 0x3b);
			DEBUG_MSG(KERN_INFO "\n VT1632 TMDS ! \n");
			DEBUG_MSG(KERN_INFO "\n %2d",
				  viaparinfo->chip_info->
				  tmds_chip_info.tmds_chip_name);
			DEBUG_MSG(KERN_INFO "\n %2d",
				  viaparinfo->chip_info->
				  tmds_chip_info.i2c_port);
			return true;
		}
	}

	viaparinfo->chip_info->tmds_chip_info.tmds_chip_name = INTEGRATED_TMDS;

	if ((viaparinfo->chip_info->gfx_chip_name == UNICHROME_CX700) &&
	    ((viafb_display_hardware_layout == HW_LAYOUT_DVI_ONLY) ||
	     (viafb_display_hardware_layout == HW_LAYOUT_LCD_DVI))) {
		DEBUG_MSG(KERN_INFO "\n Integrated TMDS ! \n");
		return true;
	}

	switch (viaparinfo->chip_info->gfx_chip_name) {
	case UNICHROME_K8M890:
		viafb_write_reg(SR2A, VIASR, sr2a);
		break;

	case UNICHROME_P4M900:
	case UNICHROME_P4M890:
		viafb_write_reg(SR2A, VIASR, sr2a);
		viafb_write_reg(SR1E, VIASR, sr1e);
		break;

	default:
		viafb_write_reg(SR1E, VIASR, sr1e);
		viafb_write_reg(SR3E, VIASR, sr3e);
		break;
	}

	viaparinfo->chip_info->
		tmds_chip_info.tmds_chip_name = NON_TMDS_TRANSMITTER;
	viaparinfo->chip_info->tmds_chip_info.
		tmds_chip_target_addr = VT1632_TMDS_I2C_ADDR;
	return false;
}

static void tmds_register_write(int index, u8 data)
{
	viafb_i2c_writebyte(viaparinfo->chip_info->tmds_chip_info.i2c_port,
			    viaparinfo->chip_info->tmds_chip_info.tmds_chip_target_addr,
			    index, data);
}

static int tmds_register_read(int index)
{
	u8 data;

	viafb_i2c_readbyte(viaparinfo->chip_info->tmds_chip_info.i2c_port,
			   (u8) viaparinfo->chip_info->tmds_chip_info.tmds_chip_target_addr,
			   (u8) index, &data);
	return data;
}

static int tmds_register_read_bytes(int index, u8 *buff, int buff_len)
{
	viafb_i2c_readbytes(viaparinfo->chip_info->tmds_chip_info.i2c_port,
			    (u8) viaparinfo->chip_info->tmds_chip_info.tmds_chip_target_addr,
			    (u8) index, buff, buff_len);
	return 0;
}

/* DVI Set Mode */
void viafb_dvi_set_mode(const struct fb_var_screeninfo *var,
	u16 cxres, u16 cyres, int iga)
{
	struct fb_var_screeninfo dvi_var = *var;
	const struct fb_videomode *rb_mode;
	int maxPixelClock;

	maxPixelClock = viaparinfo->shared->tmds_setting_info.max_pixel_clock;
	if (maxPixelClock && PICOS2KHZ(var->pixclock) / 1000 > maxPixelClock) {
		rb_mode = viafb_get_best_rb_mode(var->xres, var->yres, 60);
		if (rb_mode)
			viafb_fill_var_timing_info(&dvi_var, rb_mode);
	}

	viafb_fill_crtc_timing(&dvi_var, cxres, cyres, iga);
}

/* Sense DVI Connector */

Annotation

Implementation Notes