root@colibri-t20:~# stty -F /dev/ttyHS3 57600
[ 2622.443653] tegra_uart tegra_uart.3: Setting clk_src pll_p
[ 2622.455765] tegra_uart tegra_uart.3: Setting clk_src pll_p
[ 2622.463890] tegra_uart tegra_uart.3: Setting clk_src pll_p
root@colibri-t20:~# stty -F /dev/ttyHS3 9600
[ 2635.203443] tegra_uart tegra_uart.3: Setting clk_src pll_p
[ 2635.210187] tegra_uart tegra_uart.3: Setting clk_src pll_p
[ 2635.216972] tegra_uart tegra_uart.3: Setting clk_src pll_p
What actual error do you see, the kernel output you provide are informational messages which by themself do not report an error.
Could you provide the version of the kernel used?
What module do you experiance an error on? The question points to Colibri T30, the command output points to Colibri T20.