Thanks, explicit termios(with flags) structure usage helped(log below), however, the dependent Bluetooth uart driver switches the uart baud rates between 115K(during initialization), 9600(during low power) and 4+M(data tfr), in this juncture I need to handle termios structure switching accordingly else I see c_cflags getting messed up effecting next baud switch change. ================================ [ 9.070648] alloc_set_baud_rate_cmd Setting arbitrary baudrate using BOTHER baudrate:89 c_cflag:020000016260 [ 9.164581] tty_termios_encode_baud_rate c_ispeed:4050000 c_ospeed:4050000 c_cflag:020000016260 [ 9.173278] tty_termios_encode_baud_rate checking precise weird baudrate c_cflag:020000006260 oclose:0 iclose:81000 ibinput:0 [ 9.187103] tty_termios_encode_baud_rate did we find close match? i:31 n_baud_table31 ifound:30 ofound:-1 [ 9.197570] tty_termios_encode_baud_rate BOTHER, c_cflag:022003616260 [ 9.214630] tty_termios_baud_rate:(Arb'ry baud set) c_cflag:022003616260 cbaud:010000 [ 9.222503] pl011_set_termios i_speed:4050000 o_speed:4050000 [ 9.231384] tty_termios_baud_rate:(Arb'ry baud set) c_cflag:022003616260 cbaud:010000 [ 9.246643] pl011_set_termios baud:4050000 uart_clk:38400000 port:0 IBRD:1 FBRD:12 [ 9.254730] XXXXXX-uart XXXXXX-uart.0: Baud rate changed to 4050000 baud ================================ Thanks, Rajanikanth > 4.05M Arbitrary Baud Setting Sequence: > [ 9.664703] alloc_set_baud_rate_cmd Setting arbitrary baudrate using BOTHER baudrate:89 c_cflag:020000016262 > [ 9.774658] XXXXXX_hci_uart_set_baudrate c_cflag:020000016262 baud:4050000 4050000 seems a bit odd - you want cflag&CBAUD == BOTHER so I'd expect the low bits to end rather different things to 6262 ? So something like struct ktermios new = *tty->termios; new.c_cflag &= ~(CBAUD|CIBAUD); new.c_cflag |= BOTHER; new.c_ispeed = 4050000; new.c_ospeed = 4050000; tty_set_termios(tty, &new); /* Can sleep */ /* Returned new will now hold actual values selected */ should do the trick providing the low level driver supports the rate. Alan -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
