HPS QSPI flash programming

Yep, I can. I run Altera-SoCFPGA-HardwareLib-QSPI-CV-GNU example as well. The problem arises when execution reaches alt_qspi_enable()->alt_qspi_device_rdid()->alt_qspi_stig_rd_cmd()->alt_qspi_stig_cmd_helper() function (the last one). There is a piece of code:

    do
    {
        reg_value = alt_read_word(ALT_QSPI_FLSHCMD_ADDR);
        if (!(reg_value & ALT_QSPI_FLSHCMD_CMDEXECSTAT_SET_MSK))
        {
            break;
        }
    } while (timeout-- || infinite);
    if (timeout == (uint32_t)-1 && !infinite)
    {
        status = ALT_E_TMO;
    }

where the execution hangs till timeout. It seems the code fails to read something from flash via QSPI. In the time of polling flash via QSPI there is no activity on the bus, I checked it with oscilloscope.