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serial: stm32: add Framing error support

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Add management of Bit 1 of USART_ISR = FE: Framing error
This bit is set by hardware when a de-synchronization, excessive noise
or a break character is detected. It is cleared by software, writing 1
to the FECF bit in the USART_ICR register (for stm32 after f4).

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
This commit is contained in:
Patrick Delaunay 2019-07-30 19:16:46 +02:00 committed by Patrice Chotard
parent 48ac723a6f
commit 132518f36b
2 changed files with 5 additions and 2 deletions
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5
drivers/serial/serial_stm32.c
View File

@ -106,10 +106,11 @@ static int stm32_serial_getc(struct udevice *dev)
if ((isr & USART_ISR_RXNE) == 0)
return -EAGAIN;
if (isr & (USART_ISR_PE | USART_ISR_ORE)) {
if (isr & (USART_ISR_PE | USART_ISR_ORE | USART_ISR_FE)) {
if (!stm32f4)
setbits_le32(base + ICR_OFFSET,
USART_ICR_PCECF | USART_ICR_ORECF);
USART_ICR_PCECF | USART_ICR_ORECF |
USART_ICR_FECF);
else
readl(base + RDR_OFFSET(stm32f4));
return -EIO;

2
drivers/serial/serial_stm32.h
View File

@ -67,6 +67,7 @@ struct stm32x7_serial_platdata {
#define USART_ISR_TXE BIT(7)
#define USART_ISR_RXNE BIT(5)
#define USART_ISR_ORE BIT(3)
#define USART_ISR_FE BIT(1)
#define USART_ISR_PE BIT(0)
#define USART_BRR_F_MASK GENMASK(7, 0)
@ -74,6 +75,7 @@ struct stm32x7_serial_platdata {
#define USART_BRR_M_MASK GENMASK(15, 4)
#define USART_ICR_ORECF BIT(3)
#define USART_ICR_FECF BIT(1)
#define USART_ICR_PCECF BIT(0)
#endif