From: Jordan Crouse <[email protected]>
Use the Geode GX BIOS virtual registers to get the actual size of the
framebuffer.
Signed-off-by: Jordan Crouse <[email protected]>
---
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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