CONTEXT_RUN
reg_write(ohci, CONTROL_SET(ctx->regs), CONTEXT_RUN | extra);
reg_write(ohci, CONTROL_CLEAR(ctx->regs), CONTEXT_RUN);
if (reg_read(ohci, CONTROL_CLEAR(ctx->regs)) & CONTEXT_RUN) {
reg_write(ohci, CONTROL_CLEAR(ctx->regs), CONTEXT_RUN);
reg_write(ctx->ohci, CONTROL_SET(ctx->regs), CONTEXT_RUN);