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authorH. Peter Anvin <hpa@linux.intel.com>2009-04-07 10:59:25 -0700
committerH. Peter Anvin <hpa@linux.intel.com>2009-04-07 10:59:25 -0700
commit1e274a582710e95d93b86e8d47e9fcce4ca09d01 (patch)
treed91aa694ed60fe170baa613826f8e8d74eddc229 /arch/x86/boot
parentf7d7f866baacc283967ce82ebdfe5d2801059a11 (diff)
x86, setup: un-resequence mode setting for VGA 80x34 and 80x60 modes
Impact: Fixes these modes on at least one system The rewrite of the setup code into C resequenced the font setting and register reprogramming phases of configuring nonstandard VGA modes which use 480 scan lines in text mode. However, there exists at least one board (Micro-Star MS-7383 version 2.0) on which this resequencing causes an unusable display. Revert to the original sequencing: set up 480-line mode, install the font, and then adjust the vertical end register appropriately. This failure was masked by the fact that the 480-line setup was broken until checkin 5f641356127712fbdce0eee120e5ce115860c17f (therefore this is not a -stable candidate bug fix.) Reported-by: Andi Kleen <andi@firstfloor.org> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/boot')
-rw-r--r--arch/x86/boot/video-vga.c33
1 files changed, 23 insertions, 10 deletions
diff --git a/arch/x86/boot/video-vga.c b/arch/x86/boot/video-vga.c
index 95d86ce0421..9e0587a3776 100644
--- a/arch/x86/boot/video-vga.c
+++ b/arch/x86/boot/video-vga.c
@@ -129,22 +129,18 @@ u16 vga_crtc(void)
return (inb(0x3cc) & 1) ? 0x3d4 : 0x3b4;
}
-static void vga_set_480_scanlines(int lines)
+static void vga_set_480_scanlines(void)
{
u16 crtc; /* CRTC base address */
u8 csel; /* CRTC miscellaneous output register */
- u8 ovfw; /* CRTC overflow register */
- int end = lines-1;
crtc = vga_crtc();
- ovfw = 0x3c | ((end >> (8-1)) & 0x02) | ((end >> (9-6)) & 0x40);
-
out_idx(0x0c, crtc, 0x11); /* Vertical sync end, unlock CR0-7 */
out_idx(0x0b, crtc, 0x06); /* Vertical total */
- out_idx(ovfw, crtc, 0x07); /* Vertical overflow */
+ out_idx(0x3e, crtc, 0x07); /* Vertical overflow */
out_idx(0xea, crtc, 0x10); /* Vertical sync start */
- out_idx(end, crtc, 0x12); /* Vertical display end */
+ out_idx(0xdf, crtc, 0x12); /* Vertical display end */
out_idx(0xe7, crtc, 0x15); /* Vertical blank start */
out_idx(0x04, crtc, 0x16); /* Vertical blank end */
csel = inb(0x3cc);
@@ -153,21 +149,38 @@ static void vga_set_480_scanlines(int lines)
outb(csel, 0x3c2);
}
+static void vga_set_vertical_end(int lines)
+{
+ u16 crtc; /* CRTC base address */
+ u8 ovfw; /* CRTC overflow register */
+ int end = lines-1;
+
+ crtc = vga_crtc();
+
+ ovfw = 0x3c | ((end >> (8-1)) & 0x02) | ((end >> (9-6)) & 0x40);
+
+ out_idx(ovfw, crtc, 0x07); /* Vertical overflow */
+ out_idx(end, crtc, 0x12); /* Vertical display end */
+}
+
static void vga_set_80x30(void)
{
- vga_set_480_scanlines(30*16);
+ vga_set_480_scanlines();
+ vga_set_vertical_end(30*16);
}
static void vga_set_80x34(void)
{
+ vga_set_480_scanlines();
vga_set_14font();
- vga_set_480_scanlines(34*14);
+ vga_set_vertical_end(34*14);
}
static void vga_set_80x60(void)
{
+ vga_set_480_scanlines();
vga_set_8font();
- vga_set_480_scanlines(60*8);
+ vga_set_vertical_end(60*8);
}
static int vga_set_mode(struct mode_info *mode)