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tty: serial: msm: Only configure MND registers on hw that has it

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The registers that msm_serial_set_mnd_regs() writes only exist on
the non-uartdm hardware, so let's return early here if this
function is called on uartdm hardware. This also prevents us from
messing up the uartclk variable if the uartclk rate happens to be
19.2 or 4.8 MHz.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen Boyd 2016-05-11 18:02:27 -07:00 committed by Greg Kroah-Hartman
parent 321737416c
commit 2a31f09455
1 changed files with 9 additions and 0 deletions
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9
drivers/tty/serial/msm_serial.c
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@ -232,6 +232,15 @@ static void msm_serial_set_mnd_regs_tcxoby4(struct uart_port *port)
static void msm_serial_set_mnd_regs(struct uart_port *port)
{
struct msm_port *msm_port = UART_TO_MSM(port);
/*
* These registers don't exist so we change the clk input rate
* on uartdm hardware instead
*/
if (msm_port->is_uartdm)
return;
if (port->uartclk == 19200000)
msm_serial_set_mnd_regs_tcxo(port);
else if (port->uartclk == 4800000)