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serial_mxc: Fix setup of UARTx_UFCR register

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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>
This commit is contained in:
Maximilian Schwerin 2015-11-25 14:08:00 +01:00 committed by Stefano Babic
parent f0b5f23f32
commit 434afa809e
1 changed files with 8 additions and 1 deletions
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9
drivers/serial/serial_mxc.c
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@ -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);