In tpm2_i2c_infineon, iic_tpm_read() is expected to retry up to 3 times in case of underlying i2c bus issues (such as NAKs). However, in 9635, if the 1st attempt is rejected by the bus driver due to the size of the chunk being bigger than adapter limit, that will eat the attempt. And in case of subsequent bus issues, the transaction will only be retried twice.

Possible example from real life: http://b/33758106#comment131