Revert "[nrf fromlist] drivers: serial: nrfx_uarte: Workaround for spurious RXTO during restart"

This reverts commit b70dea6.

Signed-off-by: Krzysztof Chruściński <[email protected]>

Author: nordic-krch

drivers/serial/Kconfig.nrfx

@@ -63,11 +63,6 @@ config UART_ASYNC_TX_CACHE_SIZE
 	  in RAM, because EasyDMA in UARTE peripherals can only transfer data
 	  from RAM.
 
-config UART_NRFX_UARTE_SPURIOUS_RXTO_WORKAROUND
-	bool
-	help
-	  Apply workaround for spurious RXTO during restart.
-
 if HAS_HW_NRF_UART0 || HAS_HW_NRF_UARTE0
 nrfx_uart_num = 0
 rsource "Kconfig.nrfx_uart_instance"

drivers/serial/uart_nrfx_uarte.c

@@ -266,9 +266,6 @@ struct uarte_nrfx_data {
 /* If enabled then UARTE peripheral is using memory which is cacheable. */
 #define UARTE_CFG_FLAG_CACHEABLE BIT(3)
 
-/* Indicates that workaround for spurious RXTO during restart shall be applied. */
-#define UARTE_CFG_FLAG_SPURIOUS_RXTO BIT(3)
-
 /* Formula for getting the baudrate settings is following:
  * 2^12 * (2^20 / (f_PCLK / desired_baudrate)) where f_PCLK is a frequency that
  * drives the UARTE.
@@ -1549,17 +1546,6 @@ static void endrx_isr(const struct device *dev)
 		unsigned int key = irq_lock();
 
 		if (async_rx->buf) {
-
-#if CONFIG_UART_NRFX_UARTE_SPURIOUS_RXTO_WORKAROUND
-			/* Check for spurious RXTO event. */
-			const struct uarte_nrfx_config *config = dev->config;
-
-			if ((config->flags & UARTE_CFG_FLAG_SPURIOUS_RXTO) &&
-			    nrf_uarte_event_check(uarte, NRF_UARTE_EVENT_RXTO)) {
-				nrf_uarte_event_clear(uarte, NRF_UARTE_EVENT_RXTO);
-			}
-#endif
-
 			/* Check is based on assumption that ISR handler handles
 			 * ENDRX before RXSTARTED so if short was set on time, RXSTARTED
 			 * event will be set.
@@ -2581,9 +2567,6 @@ static int uarte_instance_init(const struct device *dev,
 			(!IS_ENABLED(CONFIG_HAS_NORDIC_DMM) ? 0 :	       \
 			  (UARTE_IS_CACHEABLE(idx) ?			       \
 				UARTE_CFG_FLAG_CACHEABLE : 0)) |	       \
-			(IS_ENABLED(CONFIG_UART_NRFX_UARTE_SPURIOUS_RXTO_WORKAROUND) && \
-			 INSTANCE_IS_HIGH_SPEED(_, /*empty*/, idx, _) ?	       \
-			 UARTE_CFG_FLAG_SPURIOUS_RXTO : 0) |		       \
 			USE_LOW_POWER(idx),				       \
 		UARTE_DISABLE_RX_INIT(UARTE(idx)),			       \
 		.poll_out_byte = &uarte##idx##_poll_out_byte,		       \