diff options
| author | Maximilian Schwerin | 2015-11-25 14:08:00 +0100 |
|---|---|---|
| committer | Stefano Babic | 2016-01-03 15:22:11 +0100 |
| commit | 434afa809e91bbf67e003df8daf0e2f39c48ce59 (patch) | |
| tree | 0d101bb518ce760f958de4ae70f7b4a045ee79b5 | |
| parent | f0b5f23f32adfb790293c4f1722042026fa98416 (diff) | |
serial_mxc: Fix setup of UARTx_UFCR register
This patch writes the default values for TXTL and RXTL to UARTx_UFCR.
Without this patch some older kernel versions crash as UARTx_UFCR was
not always correctly initialized.
Signed-off-by: Maximilian Schwerin <maximilian.schwerin@tigris.de>
| -rw-r--r-- | drivers/serial/serial_mxc.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/serial/serial_mxc.c b/drivers/serial/serial_mxc.c index d6cf1d874a6..51485c0d095 100644 --- a/drivers/serial/serial_mxc.c +++ b/drivers/serial/serial_mxc.c @@ -75,6 +75,7 @@ #define UCR4_DREN (1<<0) /* Recv data ready interrupt enable */ #define UFCR_RXTL_SHF 0 /* Receiver trigger level shift */ #define UFCR_RFDIV (7<<7) /* Reference freq divider mask */ +#define UFCR_RFDIV_SHF 7 /* Reference freq divider shift */ #define UFCR_TXTL_SHF 10 /* Transmitter trigger level shift */ #define USR1_PARITYERR (1<<15) /* Parity error interrupt flag */ #define USR1_RTSS (1<<14) /* RTS pin status */ @@ -135,6 +136,10 @@ DECLARE_GLOBAL_DATA_PTR; +#define TXTL 2 /* reset default */ +#define RXTL 1 /* reset default */ +#define RFDIV 4 /* divide input clock by 2 */ + static void mxc_serial_setbrg(void) { u32 clk = imx_get_uartclk(); @@ -142,7 +147,9 @@ static void mxc_serial_setbrg(void) if (!gd->baudrate) gd->baudrate = CONFIG_BAUDRATE; - __REG(UART_PHYS + UFCR) = 4 << 7; /* divide input clock by 2 */ + __REG(UART_PHYS + UFCR) = (RFDIV << UFCR_RFDIV_SHF) + | (TXTL << UFCR_TXTL_SHF) + | (RXTL << UFCR_RXTL_SHF); __REG(UART_PHYS + UBIR) = 0xf; __REG(UART_PHYS + UBMR) = clk / (2 * gd->baudrate); |