[ Upstream commit
b83b957c91f68e53f0dc596e129e8305761f2a32 ]
Disables the tx irq when the transmission is ended and updates stop_tx
conditions for code cleanup.
Fixes:
48a6092fb41f ("serial: stm32-usart: Add STM32 USART Driver")
Signed-off-by: Erwan Le Ray <erwan.leray@st.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
- if (uart_tx_stopped(port)) {
- stm32_stop_tx(port);
- return;
- }
-
- if (uart_circ_empty(xmit)) {
- stm32_stop_tx(port);
+ if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+ stm32_clr_bits(port, ofs->cr1, USART_CR1_TXEIE);
uart_write_wakeup(port);
if (uart_circ_empty(xmit))
uart_write_wakeup(port);
if (uart_circ_empty(xmit))
+ stm32_clr_bits(port, ofs->cr1, USART_CR1_TXEIE);
}
static irqreturn_t stm32_interrupt(int irq, void *ptr)
}
static irqreturn_t stm32_interrupt(int irq, void *ptr)