[lvc-project] [PATCH v2] serial: 8250_mtk: correct max baud rate in set_termios() method

[Sergey Shtylyov]

On 10/18/25 3:57 PM, Fedor Pchelkin wrote:
[...]

>> Mediatek MT798x datasheets (that I was able to get my hands on) claim
>> the maximum supported baud rate to be 3 Mbps, while commit 81bb549fdf14
>> ("serial: 8250_mtk: support big baud rate.") claimed it to be 4 Mbps --
>> however, it then passed undivided port->uartclk to uart_get_baud_rate()
>> for the maximum baud rate, while the datasheets do mention up to 52 MHz
>> as the baud clock's frequency.  This means that an integer overflow will
>> happen (when multiplying the baud variable by 256) if a baud rate higher
>> than 16777215 bps is passed via termios->c_ospeed. Pass the correct max
>> baud rate of 3 Mbps or port->uartclk, whichever happens to be less...
> 
> Кажется, на эту проблему уже ушло больше времени, чем она того заслуживает.
> Добавлю патч с корректировкой на 4 Mbps в описании и diff'е.

   К сожалению, староый patch description больше не подойдёт. Я надеюсь
отправить v3 сегодня...

[...]

MBR, Sergey