diff -ur orig/src/smi_video.c mod/src/smi_video.c
--- xf86-video-siliconmotion-1.7.3.orig/src/smi_video.c	2009-07-27 05:42:44.000000000 +0200
+++ xf86-video-siliconmotion-1.7.3/src/smi_video.c	2010-06-03 16:55:59.169793245 +0200
@@ -276,6 +276,7 @@ static XF86ImageRec SMI_VideoImages[] =
     XVIMAGE_YUY2,
     XVIMAGE_YV12,
     XVIMAGE_I420,
+    XVIMAGE_UYVY,
     {
 	FOURCC_RV15,			/* id				*/
 	XvRGB,				/* type				*/
@@ -1103,7 +1104,7 @@ SMI_PutVideo(
 	vpr00 |= 0x0010000E;
     } else {
 	/*
-	  Bit 21     = 10: Vertical Interpolation                   = enabled
+	  Bit 21     = 1: Vertical Interpolation                   = enabled
 	  Bit 24     = 1: Select Video Window I Source Addr        = 1
 	  1= Video window I source addr = capture port buffer ?
 	*/
@@ -1464,6 +1465,117 @@ SMI_QueryBestSize(
     LEAVE();
 }
 
+static void myXVCopyYUV12ToPacked(const unsigned char *srcy, const unsigned char *srcv, const unsigned char *srcu,
+		unsigned char *dst, int srcPitchy, int srcPitchuv, int dstPitch, int h, int w)
+{
+	int i, j;
+	unsigned char const *y, *u, *v;
+	int dstinc, yinc, uinc, vinc;
+
+	y = srcy;
+	u = srcu;
+	v = srcv;
+
+	dstinc = dstPitch - 2*w;
+	yinc = srcPitchy - w;
+	uinc = srcPitchuv - w/2;
+	vinc = srcPitchuv - w/2;
+
+	for (i = 0; i < h; i++) {
+		asm (
+//			".set arch=loongson2f\n\t"
+			".set noreorder\n\t"
+			"move $8, %8 \n\t"
+			"1: \n\t"
+			"beqz $8, 2f \n\t"
+			"xor $f0, $f0, $f0 \n\t"
+			"ldc1 $f4, (%0) \n\t"
+			"punpcklbh $f2, $f4, $f0 \n\t"
+			"punpckhbh $f4, $f4, $f0 \n\t"
+			"ldc1 $f16, 8(%0) \n\t"
+			"punpcklbh $f14, $f16, $f0 \n\t"
+			"punpckhbh $f16, $f16, $f0 \n\t"
+			
+			"lwc1 $f8, (%1) \n\t"
+			"lwc1 $f12, (%2) \n\t"
+			"punpcklbh $f8, $f8, $f12 \n\t"
+			"punpcklbh $f6, $f0, $f8 \n\t"
+			"punpckhbh $f8, $f0, $f8 \n\t"
+			"lwc1 $f18, 4(%1) \n\t"
+			"lwc1 $f12, 4(%2) \n\t"
+			"punpcklbh $f18, $f18, $f12 \n\t"
+			"punpcklbh $f10, $f0, $f18 \n\t"
+			"punpckhbh $f12, $f0, $f18 \n\t"
+
+			"or $f2, $f2, $f6 \n\t"
+			"or $f4, $f4, $f8 \n\t"
+			"or $f14, $f14, $f10 \n\t"
+			"or $f16, $f16, $f12 \n\t"
+
+			"sdc1 $f2, (%3) \n\t"
+			"sdc1 $f4, 8(%3) \n\t"
+			"add %0, 16 \n\t"
+			"add %1, 8 \n\t"
+			"add %2, 8 \n\t"
+			"sdc1 $f14, 0x10(%3) \n\t"
+			"sdc1 $f16, 0x18(%3) \n\t"
+			"add $8, -1 \n\t"
+			"b 1b \n\t"
+			"add %3, 32 \n\t"
+			"2: \n\t"
+			".set reorder\n\t"
+			: "=r" (y), "=r" (u), "=r" (v), "=r" (dst)
+			: "0" (y), "1" (u), "2" (v), "3" (dst), "r" (w>>4)
+			: "memory","$8"
+		);
+
+		asm (
+//			".set arch=loongson2f\n\t"
+			".set noreorder\n\t"
+			"move $8, %8 \n\t"
+			"1: \n\t"
+			"beqz $8, 2f \n\t"
+			"xor $f0, $f0, $f0 \n\t"
+			"ldc1 $f4, (%0) \n\t"
+			"punpcklbh $f2, $f4, $f0 \n\t"
+			"punpckhbh $f4, $f4, $f0 \n\t"
+			
+			"lwc1 $f8, (%1) \n\t"
+			"lwc1 $f12, (%2) \n\t"
+			"punpcklbh $f8, $f8, $f12 \n\t"
+			"punpcklbh $f6, $f0, $f8 \n\t"
+			"punpckhbh $f8, $f0, $f8 \n\t"
+
+			"or $f2, $f2, $f6 \n\t"
+			"or $f4, $f4, $f8 \n\t"
+
+			"sdc1 $f2, (%3) \n\t"
+			"sdc1 $f4, 8(%3) \n\t"
+			"add %0, 8 \n\t"
+			"add %1, 4 \n\t"
+			"add %2, 4 \n\t"
+			"add $8, -1 \n\t"
+			"b 1b \n\t"
+			"add %3, 16 \n\t"
+			"2:\n\t"
+			".set reorder\n\t"
+			: "=r" (y), "=r" (u), "=r" (v), "=r" (dst)
+			: "0" (y), "1" (u), "2" (v), "3" (dst), "r" ((w&0xf)/8)
+			: "memory","$8"
+		);
+
+		for (j = (w&7)/2; j; j--) {
+			*dst++ = *y++;
+			*dst++ = *u++;
+			*dst++ = *y++;
+			*dst++ = *v++;
+		}
+		y += yinc;
+		u = (i%2) ? (u + uinc): (u - w/2);
+		v = (i%2) ? (v + vinc): (v - w/2);
+		dst += dstinc;
+	}
+}
 
 static int
 SMI_PutImage(
@@ -1592,7 +1704,7 @@ SMI_PutImage(
 		offset3 = tmp;
 	    }
 	    nLines = ((((y2 + 0xffff) >> 16) + 1) & ~1) - top;
-	    xf86XVCopyYUV12ToPacked(buf + (top * srcPitch) + (left >> 1), 
+	    myXVCopyYUV12ToPacked(buf + (top * srcPitch) + (left >> 1), 
 				    buf + offset2, buf + offset3, dstStart,
 				    srcPitch, srcPitch2, dstPitch, nLines,
 				    nPixels);
@@ -1747,7 +1859,7 @@ SMI_DisplayVideo(
 {
     SMIPtr pSmi = SMIPTR(pScrn);
     CARD32 vpr00;
-    int hstretch, vstretch;
+    uint_least32_t hstretch, vstretch;
 
     ENTER();
 
@@ -1774,13 +1886,13 @@ SMI_DisplayVideo(
     }
 
     if (drw_w > vid_w) {
-	hstretch = (2560 * vid_w / drw_w + 5) / 10;
+	hstretch = ((uint_least32_t)(vid_w - 1) << 16) / (drw_w - 1);
     } else {
 	hstretch = 0;
     }
 
     if (drw_h > vid_h) {
-	vstretch = (2560 * vid_h / drw_h + 5) / 10;
+	vstretch = ((uint_least32_t)(vid_h - 1) << 16) / (drw_h - 1);
 	vpr00 |= 1 << 21;
     } else {
 	vstretch = 0;
@@ -1791,7 +1903,8 @@ SMI_DisplayVideo(
     WRITE_VPR(pSmi, 0x18, (dstBox->x2) | (dstBox->y2 << 16));
     WRITE_VPR(pSmi, 0x1C, offset >> 3);
     WRITE_VPR(pSmi, 0x20, (pitch >> 3) | ((pitch >> 3) << 16));
-    WRITE_VPR(pSmi, 0x24, (hstretch << 8) | vstretch);
+    WRITE_VPR(pSmi, 0x24, (hstretch & 0xff00) | ((vstretch & 0xff00) >> 8));
+    WRITE_VPR(pSmi, 0x68, ((hstretch & 0xff) << 8) | (vstretch & 0xff));
 
     LEAVE();
 }