MCLK_CNTL__R300_DISABLE_MC_MCLKB
(tmp & MCLK_CNTL__R300_DISABLE_MC_MCLKB)) {
tmp &= ~MCLK_CNTL__R300_DISABLE_MC_MCLKB;
MCLK_CNTL__R300_DISABLE_MC_MCLKB);