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Diffstat (limited to 'src/ativalid.c')
| -rw-r--r-- | src/ativalid.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/src/ativalid.c b/src/ativalid.c new file mode 100644 index 0000000..adc8734 --- /dev/null +++ b/src/ativalid.c @@ -0,0 +1,235 @@ +/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/ati/ativalid.c,v 1.15 2003/01/01 19:16:34 tsi Exp $ */ +/* + * Copyright 1997 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 "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. + */ +int +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->OptionSync || (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; +} |