projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | [This file is cloned from VesaFB/matroxfb] |
| 2 | ||
| 3 | What is sa1100fb? | |
| 4 | ================= | |
| 5 | ||
| 6 | This is a driver for a graphic framebuffer for the SA-1100 LCD | |
| 7 | controller. | |
| 8 | ||
| 9 | Configuration | |
| 10 | ============== | |
| 11 | ||
| 12 | For most common passive displays, giving the option | |
| 13 | ||
| 14 | video=sa1100fb:bpp:<value>,lccr0:<value>,lccr1:<value>,lccr2:<value>,lccr3:<value> | |
| 15 | ||
| 16 | on the kernel command line should be enough to configure the | |
| 17 | controller. The bits per pixel (bpp) value should be 4, 8, 12, or | |
| 18 | 16. LCCR values are display-specific and should be computed as | |
| 19 | documented in the SA-1100 Developer's Manual, Section 11.7. Dual-panel | |
| 20 | displays are supported as long as the SDS bit is set in LCCR0; GPIO<9:2> | |
| 21 | are used for the lower panel. | |
| 22 | ||
| 23 | For active displays or displays requiring additional configuration | |
| 24 | (controlling backlights, powering on the LCD, etc.), the command line | |
| 25 | options may not be enough to configure the display. Adding sections to | |
| 26 | sa1100fb_init_fbinfo(), sa1100fb_activate_var(), | |
| 27 | sa1100fb_disable_lcd_controller(), and sa1100fb_enable_lcd_controller() | |
| 28 | will probably be necessary. | |
| 29 | ||
| 30 | Accepted options: | |
| 31 | ||
| 32 | bpp:<value> Configure for <value> bits per pixel | |
| 33 | lccr0:<value> Configure LCD control register 0 (11.7.3) | |
| 34 | lccr1:<value> Configure LCD control register 1 (11.7.4) | |
| 35 | lccr2:<value> Configure LCD control register 2 (11.7.5) | |
| 36 | lccr3:<value> Configure LCD control register 3 (11.7.6) | |
| 37 | ||
| 38 | -- | |
| 39 | Mark Huang <mhuang@livetoy.com> |