Messages in this thread Patch in this message | | | From | "Jordan Crouse" <> | Subject | [PATCH 1/4] FB: Get the Geode GX frambuffer size from the BIOS | Date | Mon, 24 Jul 2006 10:56:00 -0600 |
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From: Jordan Crouse <jordan.crouse@amd.com>
Use the Geode GX BIOS virtual registers to get the actual size of the framebuffer.
Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> ---
drivers/video/geode/display_gx.c | 15 ++++++++++++--- drivers/video/geode/display_gx.h | 2 +- 2 files changed, 13 insertions(+), 4 deletions(-)
diff --git a/drivers/video/geode/display_gx.c b/drivers/video/geode/display_gx.c index 825c340..0245169 100644 --- a/drivers/video/geode/display_gx.c +++ b/drivers/video/geode/display_gx.c @@ -21,10 +21,19 @@ #include <asm/delay.h> #include "geodefb.h" #include "display_gx.h" -int gx_frame_buffer_size(void) +unsigned int gx_frame_buffer_size(void) { - /* Assuming 16 MiB. */ - return 16*1024*1024; + 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); } int gx_line_delta(int xres, int bpp) diff --git a/drivers/video/geode/display_gx.h b/drivers/video/geode/display_gx.h index 86c6233..41e79f4 100644 --- a/drivers/video/geode/display_gx.h +++ b/drivers/video/geode/display_gx.h @@ -11,7 +11,7 @@ #ifndef __DISPLAY_GX_H__ #define __DISPLAY_GX_H__ -int gx_frame_buffer_size(void); +unsigned int gx_frame_buffer_size(void); int gx_line_delta(int xres, int bpp); extern struct geode_dc_ops gx_dc_ops;
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