vgastate fix
From: Ondrej Zajicek <hidden>
Date: 2007-04-26 07:13:35
Hello This patch do 3 updates to vgastate.c : 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 <redacted> --- diff -uprN -X linux-2.6.21-rc6-base/Documentation/dontdiff linux-2.6.21-rc6-base/drivers/video/vgastate.c linux-2.6.21-rc6/drivers/video/vgastate.c
--- linux-2.6.21-rc6-base/drivers/video/vgastate.c 2007-04-06 04:36:56.000000000 +0200
+++ linux-2.6.21-rc6/drivers/video/vgastate.c 2007-04-26 00:53:58.000000000 +0200@@ -50,23 +50,28 @@ static void save_vga_text(struct vgastat 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 @@ static void save_vga_text(struct vgastat } /* 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 @@ static void restore_vga_text(struct vgas { 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 @@ static void restore_vga_text(struct vgas 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 @@ static void restore_vga_text(struct vgas 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);
--
Elen sila lumenn' omentielvo
Ondrej 'SanTiago' Zajicek (email: santiago@mail.cz, jabber: santiago@njs.netlab.cz)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."
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