* [U-Boot] [LVDS dual channel] TCON0_LVDS_IF_REG seem have undocumented bit 30 ?
@ 2017-03-24 13:45 far5893
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From: far5893 @ 2017-03-24 13:45 UTC (permalink / raw)
To: u-boot
I try to read BSP code for enabling dual channel LVDS (for more than 768 Vertical lines),in BSP code :
<https://github.com/WigWagCo/wwrelay-bsp/blob/40ae1e9a5ebcbc22ee221fdce806b577b6606983/sunxi-bsp/linux-sunxi/drivers/video/sunxi/disp/de_lcdc.c>
#define LCDC_LVDS_OFF (0x084) /* LVDS registers offset */
LCDC_WUINT32(sel, LCDC_LVDS_OFF,(info->lcd_lvds_ch << 30)
| (0 << 29) | (0 << 28)
| (info->lcd_lvds_mode << 27)
|(info->lcd_lvds_bitwidth << 26) | (0 << 23));
there is a lcd_lvds_ch parameter from fex file that set bit30
but in documentation only bit 31 28 27 26 23 of TCON0_LVDS_IF_REG(0x084) are documented,
i'm reading wrong documentation or is really undocumented ?
I'm trying to enable lvds dual channel on A10/A20 SOC.
Thanks
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2017-03-24 13:45 [U-Boot] [LVDS dual channel] TCON0_LVDS_IF_REG seem have undocumented bit 30 ? far5893
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