diff options
Diffstat (limited to 'drivers/video/geode/display_gx.c')
| -rw-r--r-- | drivers/video/geode/display_gx.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/drivers/video/geode/display_gx.c b/drivers/video/geode/display_gx.c index 825c3405f5c2..0f16e4bffc6c 100644 --- a/drivers/video/geode/display_gx.c +++ b/drivers/video/geode/display_gx.c @@ -21,11 +21,27 @@ #include "geodefb.h" #include "display_gx.h" -int gx_frame_buffer_size(void) +#ifdef CONFIG_FB_GEODE_GX_SET_FBSIZE +unsigned int gx_frame_buffer_size(void) { - /* Assuming 16 MiB. */ - return 16*1024*1024; + return CONFIG_FB_GEODE_GX_FBSIZE; } +#else +unsigned int gx_frame_buffer_size(void) +{ + unsigned int val; + + /* FB size is reported by a virtual register */ + /* Virtual register class = 0x02 */ + /* VG_MEM_SIZE(512Kb units) = 0x00 */ + + outw(0xFC53, 0xAC1C); + outw(0x0200, 0xAC1C); + + val = (unsigned int)(inw(0xAC1E)) & 0xFFl; + return (val << 19); +} +#endif int gx_line_delta(int xres, int bpp) { @@ -81,6 +97,7 @@ static void gx_set_mode(struct fb_info *info) writel(((info->var.xres * info->var.bits_per_pixel/8) >> 3) + 2, par->dc_regs + DC_LINE_SIZE); + /* Enable graphics and video data and unmask address lines. */ dcfg |= DC_DCFG_GDEN | DC_DCFG_VDEN | DC_DCFG_A20M | DC_DCFG_A18M; |