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[U-Boot,4/6] serial: stm32f7: disable overrun

Message ID 1495133369-15382-5-git-send-email-vikas.manocha@st.com
State Accepted
Commit 6c0c3ce8aa794e972ef173694e148ddc9b7d6bcb
Delegated to: Tom Rini
Headers show

Commit Message

Vikas MANOCHA May 18, 2017, 6:49 p.m. UTC 
With overrun enabled, serial port console freezes & stops receiving data with
overun error if we keep sending data.

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
---
 drivers/serial/serial_stm32x7.c | 3 +++
 drivers/serial/serial_stm32x7.h | 2 ++
 2 files changed, 5 insertions(+)
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Patch

diff --git a/drivers/serial/serial_stm32x7.c b/drivers/serial/serial_stm32x7.c
index 1907cef..2b305cd 100644
--- a/drivers/serial/serial_stm32x7.c
+++ b/drivers/serial/serial_stm32x7.c
@@ -93,6 +93,9 @@  static int stm32_serial_probe(struct udevice *dev)
 	}
 #endif
 
+	/* Disable usart-> disable overrun-> enable usart */
+	clrbits_le32(&usart->cr1, USART_CR1_RE | USART_CR1_TE | USART_CR1_UE);
+	setbits_le32(&usart->cr3, USART_CR3_OVRDIS);
 	setbits_le32(&usart->cr1, USART_CR1_RE | USART_CR1_TE | USART_CR1_UE);
 
 	return 0;
diff --git a/drivers/serial/serial_stm32x7.h b/drivers/serial/serial_stm32x7.h
index 6190d67..8c02548 100644
--- a/drivers/serial/serial_stm32x7.h
+++ b/drivers/serial/serial_stm32x7.h
@@ -27,6 +27,8 @@  struct stm32_usart {
 #define USART_CR1_TE			(1 << 3)
 #define USART_CR1_UE			(1 << 0)
 
+#define USART_CR3_OVRDIS		(1 << 12)
+
 #define USART_SR_FLAG_RXNE		(1 << 5)
 #define USART_SR_FLAG_TXE		(1 << 7)