AGPSTAT2_1X
*bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
*bridge_agpstat |= AGPSTAT2_1X;
*requested_mode |= AGPSTAT2_1X;
*requested_mode &= ~(AGPSTAT2_1X); /* rate=2 */
*requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
*bridge_agpstat &= ~AGPSTAT2_1X;
*bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X); /* 4X */
*bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X); /* 2X */
if (*bridge_agpstat & AGPSTAT2_1X)
*bridge_agpstat |= AGPSTAT2_1X;
if (*bridge_agpstat & AGPSTAT2_1X)
*requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
*bridge_agpstat |= AGPSTAT2_1X;