tree ee62cae72933e81b5156de00d3e96eccfbd9cc86
parent eb46520c5cd8f03815ba9fc168467558f63024fe
author Prasad Kummari <prasad.kummari@amd.com> 1691421118 +0530
committer Kummari Prasad <prasad.kummari@amd.com> 1694000250 +0200

fix(cadence): update console flush uart driver

The implementation of code changes manages the transmit FIFO (TxFIFO)
in the UART driver. The added code snippet includes a sequence of
instructions that ensures efficient handling of data transmission
and synchronization with the host software.

The code first checks the TxFIFO empty flag to determine whether
there is data available for transmission. If the TxFIFO is not empty,
the code waits until it becomes empty, ensuring that the transmit
operation is synchronized with the availability of data.
Subsequently, the code monitors the transmit operation's activity
status. It waits until the transmit operation becomes inactive,
indicating the completion of the previous transmission.

This synchronization step ensures that new data can be added to the
TxFIFO without causing any loss of transmission time.

Update console_flush() function, the function waits for the
Transmitter FIFO to empty and checks the transmitter's active state.
If the transmitter is in an active state, it means it is currently
shifting out a character.

Signed-off-by: Prasad Kummari <prasad.kummari@amd.com>
Change-Id: I9d6c05bdfb9270924b40bf1f6ecb5fe541a2242e