Initial revision

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;
+}