On Wed, 22 Aug 2018 22:08:42 +0800 Liang Yang <liang.y...@amlogic.com> wrote:
> > You have to wait tWB, that's for sure. > > > we have a maximum 32 commands fifo. when command is written into > NFC_REG_CMD, it doesn't mean that command is executing right now, maybe > it is buffering on the queue.Assume one ERASE operation, when 2nd > command(0xd0) is written into NFC_REG_CMD and then come into > NAND_OP_WAITRDY_INSTR, if I read the RB status by register, it may be > wrong because 0xd0 may not being executed. it is unusual unless > buffering two many command. You should flush the queue and wait for it to empty at the end of ->exec_op(). > so it seems that i still need to use nand_soft_waitrdy or wait cmd is > executed somewhere. Don't you have a WAIT_FOR_RB instruction? What is NFC_CMD_RB for? Also, NFC_CMD_IDLE seems to allow you to add an arbitrary delay, and that's probably what you should use for tWB.
