In the MMCSD driver, the CMD6 timeout is set to the value read from the GENERIC_CMD6_TIME field of the EXTCSD register

/* Get Generic Switch Command Timeout value */
obj->switchCmdTimeout = (obj->tempDataBuf[MMCSD_GENERIC_CMD6_TIME_INDEX]) * 10; 

This is incorrect as the JEDEC spec mentions that the timeout values could be different for specific operations.

For instance, the partition switch operation has different timeout value

In case the PARTITION_SWITCH_TIME value is greater than the GENERIC_CMD6_TIME, there is a possibility that the driver times out before the partition switch operation is completed resulting in failure.