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/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/ati/ativalid.c,v 1.17 2003/10/30 17:36:58 tsi Exp $ */
/*
* Copyright 1997 through 2004 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 "atiadapter.h"
#include "atichip.h"
#include "aticrtc.h"
#include "atistruct.h"
#include "ativalid.h"
#include "xf86.h"
/*
* ATIValidMode --
*
* This checks for hardware-related limits on mode timings.
*/
_X_EXPORT ModeStatus
ATIValidMode
(
int iScreen,
DisplayModePtr pMode,
Bool Verbose,
int flags
)
{
ScrnInfoPtr pScreenInfo = xf86Screens[iScreen];
ATIPtr pATI = ATIPTR(pScreenInfo);
Bool InterlacedSeen;
int HBlankWidth, HAdjust, VScan, VInterlace;
#ifndef AVOID_CPIO
int VDisplay, VTotal;
#endif /* AVOID_CPIO */
if (flags & MODECHECK_FINAL)
{
/*
* This is the final check before the common layer accepts a mode.
* pScreenInfo->displayWidth is set to the proposed virtual pitch
* should the mode be accepted. The only check needed here is for
* 18800's and 28800's, which don't support interlaced modes if the
* pitch is over half the chipset's maximum pitch.
*/
if (pATI->MaximumInterlacedPitch)
{
/*
* Ensure no interlaced modes have a scanline pitch larger than the
* limit.
*/
if (pMode->Flags & V_INTERLACE)
InterlacedSeen = TRUE;
else
InterlacedSeen = pATI->InterlacedSeen;
if (InterlacedSeen &&
(pScreenInfo->displayWidth > pATI->MaximumInterlacedPitch))
return MODE_INTERLACE_WIDTH;
pATI->InterlacedSeen = InterlacedSeen;
}
return MODE_OK;
}
/*
* The following is done for every mode in the monitor section that
* survives the common layer's basic checks.
*/
if (pMode->VScan <= 1)
VScan = 1;
else
VScan = pMode->VScan;
if (pMode->Flags & V_DBLSCAN)
VScan <<= 1;
if (pATI->OptionPanelDisplay && (pATI->LCDPanelID >= 0))
{
if ((pMode->CrtcHDisplay > pATI->LCDHorizontal) ||
(pMode->CrtcVDisplay > pATI->LCDVertical))
return MODE_PANEL;
if (!pATI->OptionLCDSync || (pMode->type & M_T_BUILTIN))
{
if ((pMode->HDisplay > pATI->LCDHorizontal) ||
(pMode->VDisplay > pATI->LCDVertical))
return MODE_PANEL;
return MODE_OK;
}
/*
* Adjust effective timings for monitor checks. Here the modeline
* clock is ignored. Horizontal timings are scaled by the stretch
* ratio used for the displayed area. The vertical porch is scaled by
* the native resolution's aspect ratio. This seems rather arbitrary,
* and it is, but it does make all applicable VESA modes sync on a
* panel after stretching. This has the unfortunate, but necessary,
* side-effect of changing the mode's horizontal sync and vertical
* refresh rates. With some exceptions, this tends to increase the
* mode's horizontal sync rate, and decrease its vertical refresh rate.
*/
pMode->SynthClock = pATI->LCDClock;
pMode->CrtcHTotal = pMode->CrtcHBlankEnd =
ATIDivide(pMode->CrtcHTotal * pATI->LCDHorizontal,
pMode->CrtcHDisplay, -3, 1) << 3;
pMode->CrtcHSyncEnd =
ATIDivide(pMode->CrtcHSyncEnd * pATI->LCDHorizontal,
pMode->CrtcHDisplay, -3, 1) << 3;
pMode->CrtcHSyncStart =
ATIDivide(pMode->CrtcHSyncStart * pATI->LCDHorizontal,
pMode->CrtcHDisplay, -3, -1) << 3;
pMode->CrtcHDisplay = pMode->CrtcHBlankStart = pATI->LCDHorizontal;
pMode->CrtcVTotal = pMode->CrtcVBlankEnd =
ATIDivide((pMode->CrtcVTotal - pMode->CrtcVDisplay) *
pATI->LCDVertical, pATI->LCDHorizontal, 0, 1) +
pATI->LCDVertical;
pMode->CrtcVSyncEnd =
ATIDivide((pMode->CrtcVSyncEnd - pMode->CrtcVDisplay) *
pATI->LCDVertical, pATI->LCDHorizontal, 0, 1) +
pATI->LCDVertical;
pMode->CrtcVSyncStart =
ATIDivide((pMode->CrtcVSyncStart - pMode->CrtcVDisplay) *
pATI->LCDVertical, pATI->LCDHorizontal, 0, -1) +
pATI->LCDVertical;
pMode->CrtcVDisplay = pMode->CrtcVBlankStart = pATI->LCDVertical;
/*
* The CRTC only stretches the mode's displayed area, not its porches.
* Reverse-engineer the mode's timings back into the user specified
* values so that the stretched mode is produced when the CRTC is
* eventually programmed. The reverse-engineered mode is then checked
* against CRTC limits below.
*/
pMode->Clock = pATI->LCDClock;
HAdjust = pATI->LCDHorizontal - pMode->HDisplay;
# define ATIReverseHorizontal(_x) \
(pMode->_x - HAdjust)
pMode->HSyncStart = ATIReverseHorizontal(CrtcHSyncStart);
pMode->HSyncEnd = ATIReverseHorizontal(CrtcHSyncEnd);
pMode->HTotal = ATIReverseHorizontal(CrtcHTotal);
VInterlace = GetBits(pMode->Flags, V_INTERLACE) + 1;
# define ATIReverseVertical(_y) \
((((pMode->_y - pATI->LCDVertical) * VInterlace) / VScan) + \
pMode->VDisplay)
pMode->VSyncStart = ATIReverseVertical(CrtcVSyncStart);
pMode->VSyncEnd = ATIReverseVertical(CrtcVSyncEnd);
pMode->VTotal = ATIReverseVertical(CrtcVTotal);
# undef ATIReverseHorizontal
# undef ATIReverseVertical
}
HBlankWidth = (pMode->HTotal >> 3) - (pMode->HDisplay >> 3);
if (!HBlankWidth)
return MODE_HBLANK_NARROW;
switch (pATI->NewHW.crtc)
{
#ifndef AVOID_CPIO
case ATI_CRTC_VGA:
/* Prevent overscans */
if (HBlankWidth > 63)
return MODE_HBLANK_WIDE;
if (pMode->HDisplay > 2048)
return MODE_BAD_HVALUE;
if (VScan > 64)
return MODE_BAD_VSCAN;
VDisplay = pMode->VDisplay * VScan;
VTotal = pMode->VTotal * VScan;
if ((pMode->Flags & V_INTERLACE) && (pATI->Chip < ATI_CHIP_264CT))
{
VDisplay >>= 1;
VTotal >>= 1;
}
if ((VDisplay > 2048) || (VTotal > 2050))
return MODE_BAD_VVALUE;
if (pATI->Adapter != ATI_ADAPTER_VGA)
break;
if ((VDisplay > 1024) || (VTotal > 1025))
return MODE_BAD_VVALUE;
break;
#endif /* AVOID_CPIO */
case ATI_CRTC_MACH64:
if (VScan > 2)
return MODE_NO_VSCAN;
break;
default:
break;
}
return MODE_OK;
}
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