added fix (not yet completely tested) for NV40/NV45 artifacts on heavy acc engine use. Bumped driverversion to 0.37.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@11419 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/accelerants/nvidia/engine/nv_acc_dma.c

@@ -443,7 +443,6 @@ status_t nv_acc_init_dma()
 				ACCW(NV40_WHAT1, 0x000000a0);
 				ACCW(NV40_WHAT2, 0x0078e366);
 				ACCW(NV40_WHAT3, 0x0000014c);
-//				NV_REG32(NV32_PFB_CLS_PAGE2) &= 0xffff7fff; //clear b15 (unknown)
 				break;
 			case NV41:
 				ACCW(NV40P_WHAT0, 0x83280eff);

src/add-ons/accelerants/nvidia/engine/nv_general.c

@@ -90,7 +90,7 @@ status_t nv_general_powerup()
 {
 	status_t status;
 
-	LOG(1,("POWERUP: Haiku nVidia Accelerant 0.36 running.\n"));
+	LOG(1,("POWERUP: Haiku nVidia Accelerant 0.37 running.\n"));
 
 	/* preset no laptop */
 	si->ps.laptop = false;
@@ -1260,6 +1260,16 @@ static status_t nv_general_bios_to_powergraphics()
 	 * (NOTE: testsignal function block resides in DAC1 only (!)) */
 	if (si->ps.secondary_head) DAC2W(TSTCTRL, (DAC2R(TSTCTRL) & 0xfffeefff));
 
+	/* NV40 and NV45 need a 'tweak' to make sure the CRTC FIFO's/shiftregisters get
+	 * their data in time (otherwise momentarily ghost images of windows or such
+	 * may appear on heavy acceleration engine use for instance, especially in 32-bit
+	 * colordepth) */
+	if ((si->ps.card_type == NV40) || (si->ps.card_type == NV45))
+	{
+		/* clear b15: some framebuffer config item (unknown) */
+		NV_REG32(NV32_PFB_CLS_PAGE2) &= 0xffff7fff;
+	}
+
 	/* setup AGP:
 	 * Note:
 	 * This may only be done when no transfers are in progress on the bus, so now