vga: vgastate fix
1) sets 'palette access disabled' during read from AR10.
This is usually documented as needed for access AR01-AR0F,
but on ARK Logic card it is needed for AR10 (otherwise read
returns some nonsence and save_vga_text() returns before do
anything).
2) do not restore AR10, because it was not changed during
3) remove modification of misc reg:
/* force graphics mode */
vga_w(state->vgabase, VGA_MIS_W, misc | 1);
as comment is misleading - LSB of misc reg does not set/reset graphics
mode, but set color/mono adresses of CRT and some other regs.
but these regs are not used during save/restore fonts.
(it worked even when (misc | 1) was replaced by (misc & ~1) ).
Signed-off-by: Ondrej Zajicek <santiago@crfreenet.org>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/video/vgastate.c b/drivers/video/vgastate.c
index d94efaf..b91c466 100644
--- a/drivers/video/vgastate.c
+++ b/drivers/video/vgastate.c
@@ -50,23 +50,28 @@
struct regstate *saved = (struct regstate *) state->vidstate;
int i;
u8 misc, attr10, gr4, gr5, gr6, seq1, seq2, seq4;
+ unsigned short iobase;
/* if in graphics mode, no need to save */
+ misc = vga_r(state->vgabase, VGA_MIS_R);
+ iobase = (misc & 1) ? 0x3d0 : 0x3b0;
+
+ vga_r(state->vgabase, iobase + 0xa);
+ vga_w(state->vgabase, VGA_ATT_W, 0x00);
attr10 = vga_rattr(state->vgabase, 0x10);
+ vga_r(state->vgabase, iobase + 0xa);
+ vga_w(state->vgabase, VGA_ATT_W, 0x20);
+
if (attr10 & 1)
return;
-
+
/* save regs */
- misc = vga_r(state->vgabase, VGA_MIS_R);
gr4 = vga_rgfx(state->vgabase, VGA_GFX_PLANE_READ);
gr5 = vga_rgfx(state->vgabase, VGA_GFX_MODE);
gr6 = vga_rgfx(state->vgabase, VGA_GFX_MISC);
seq2 = vga_rseq(state->vgabase, VGA_SEQ_PLANE_WRITE);
seq4 = vga_rseq(state->vgabase, VGA_SEQ_MEMORY_MODE);
- /* force graphics mode */
- vga_w(state->vgabase, VGA_MIS_W, misc | 1);
-
/* blank screen */
seq1 = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE);
vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
@@ -115,15 +120,12 @@
}
/* restore regs */
- vga_wattr(state->vgabase, 0x10, attr10);
-
vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, seq2);
vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, seq4);
vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, gr4);
vga_wgfx(state->vgabase, VGA_GFX_MODE, gr5);
vga_wgfx(state->vgabase, VGA_GFX_MISC, gr6);
- vga_w(state->vgabase, VGA_MIS_W, misc);
/* unblank screen */
vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
@@ -137,11 +139,10 @@
{
struct regstate *saved = (struct regstate *) state->vidstate;
int i;
- u8 misc, gr1, gr3, gr4, gr5, gr6, gr8;
+ u8 gr1, gr3, gr4, gr5, gr6, gr8;
u8 seq1, seq2, seq4;
/* save regs */
- misc = vga_r(state->vgabase, VGA_MIS_R);
gr1 = vga_rgfx(state->vgabase, VGA_GFX_SR_ENABLE);
gr3 = vga_rgfx(state->vgabase, VGA_GFX_DATA_ROTATE);
gr4 = vga_rgfx(state->vgabase, VGA_GFX_PLANE_READ);
@@ -151,9 +152,6 @@
seq2 = vga_rseq(state->vgabase, VGA_SEQ_PLANE_WRITE);
seq4 = vga_rseq(state->vgabase, VGA_SEQ_MEMORY_MODE);
- /* force graphics mode */
- vga_w(state->vgabase, VGA_MIS_W, misc | 1);
-
/* blank screen */
seq1 = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE);
vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
@@ -213,8 +211,6 @@
vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3);
/* restore regs */
- vga_w(state->vgabase, VGA_MIS_W, misc);
-
vga_wgfx(state->vgabase, VGA_GFX_SR_ENABLE, gr1);
vga_wgfx(state->vgabase, VGA_GFX_DATA_ROTATE, gr3);
vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, gr4);
