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-rw-r--r--src/atiwonderio.c86
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diff --git a/src/atiwonderio.c b/src/atiwonderio.c
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--- a/src/atiwonderio.c
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-/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/ati/atiwonderio.c,v 1.4 2003/01/01 19:16:35 tsi Exp $ */
-/*
- * Copyright 2000 through 2003 by Marc Aurele La France (TSI @ UQV), tsi@xfree86.org
- *
- * Permission to use, copy, modify, distribute, and sell this software and its
- * documentation for any purpose is hereby granted without fee, provided that
- * the above copyright notice appear in all copies and that both that copyright
- * notice and this permission notice appear in supporting documentation, and
- * that the name of Marc Aurele La France not be used in advertising or
- * publicity pertaining to distribution of the software without specific,
- * written prior permission. Marc Aurele La France makes no representations
- * about the suitability of this software for any purpose. It is provided
- * "as-is" without express or implied warranty.
- *
- * MARC AURELE LA FRANCE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
- * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
- * EVENT SHALL MARC AURELE LA FRANCE BE LIABLE FOR ANY SPECIAL, INDIRECT OR
- * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
- * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
- * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
- * PERFORMANCE OF THIS SOFTWARE.
- */
-
-#include "ati.h"
-#include "atichip.h"
-#include "atiwonderio.h"
-
-#ifndef AVOID_CPIO
-
-/*
- * ATIModifyExtReg --
- *
- * This function is called to modify certain bits in an ATI extended VGA
- * register while preserving its other bits. The function will not write the
- * register if it turns out its value would not change. This helps prevent
- * server hangs on older adapters.
- */
-void
-ATIModifyExtReg
-(
- ATIPtr pATI,
- const CARD8 Index,
- int CurrentValue,
- const CARD8 CurrentMask,
- CARD8 NewValue
-)
-{
- /* Possibly retrieve the current value */
- if (CurrentValue < 0)
- CurrentValue = ATIGetExtReg(Index);
-
- /* Compute new value */
- NewValue &= (CARD8)(~CurrentMask);
- NewValue |= CurrentValue & CurrentMask;
-
- /* Check if value will be changed */
- if (CurrentValue == NewValue)
- return;
-
- /*
- * The following is taken from ATI's VGA Wonder programmer's reference
- * manual which says that this is needed to "ensure the proper state of the
- * 8/16 bit ROM toggle". I suspect a timing glitch appeared in the 18800
- * after its die was cast. 18800-1 and later chips do not exhibit this
- * problem.
- */
- if ((pATI->Chip <= ATI_CHIP_18800) && (Index == 0xB2U) &&
- ((NewValue ^ 0x40U) & CurrentValue & 0x40U))
- {
- CARD8 misc = inb(R_GENMO);
- CARD8 bb = ATIGetExtReg(0xBBU);
-
- outb(GENMO, (misc & 0xF3U) | 0x04U | ((bb & 0x10U) >> 1));
- CurrentValue &= (CARD8)(~0x40U);
- ATIPutExtReg(0xB2U, CurrentValue);
- ATIDelay(5);
- outb(GENMO, misc);
- ATIDelay(5);
- if (CurrentValue != NewValue)
- ATIPutExtReg(0xB2U, NewValue);
- }
- else
- ATIPutExtReg(Index, NewValue);
-}
-
-#endif /* AVOID_CPIO */