tree 7c310c3dd2e99f75488a9ad5bf93fde4752a13dc
parent 2666c1e12cb2910d16c3785f3c8b4dee017344a9
author Pali Rohár <pali@kernel.org> 1620911466 +0200
committer pali <pali@kernel.org> 1622557930 +0200

fix(plat/marvell/a3720/uart): fix configuring UART clock

When configuring the UART_BAUD_REG register, the function
console_a3700_core_init() currently only changes the baud divisor field,
leaving other fields to their previous value.

This is incorrect, because the baud divisor is computed with the
assumption that the parent clock rate is 25 MHz, and since the other
fields in this register configure the parent clock, which could have
been changed by U-Boot or Linux.

Fix this function to also configure the other fields so that the UART
parent clock is selected to be the xtal clock.

For example without this change TF-A prints only

    ERROR: a3700_system_off needs to be implemented

followed by garbage after plat_crash_console_init() is called.

After applying this change instead of garbage it also print crash info:

    PANIC at PC : 0x0000000004023800

Signed-off-by: Pali Rohár <pali@kernel.org>
Change-Id: I72f338355cc60d939b8bb978d9c7fdd576416b81