MSDC_PB1_BUSY_CHECK_SEL
pb1_val |= MSDC_PB1_BUSY_CHECK_SEL;
sdr_set_bits(host->base + MSDC_PATCH_BIT1, MSDC_PB1_BUSY_CHECK_SEL);
sdr_clr_bits(host->base + MSDC_PATCH_BIT1, MSDC_PB1_BUSY_CHECK_SEL);