Author: imp
Date: Sun Jan 26 04:57:58 2014
New Revision: 261180
URL: http://svnweb.freebsd.org/changeset/base/261180
Log:
Before resetting the USART, delay a bit to allow the transmitter to
finish the current character to drain to avoid glitching. Also,
simplify the code a smidge.
Modified:
head/sys/arm/at91/uart_dev_at91usart.c
Modified: head/sys/arm/at91/uart_dev_at91usart.c
==============================================================================
--- head/sys/arm/at91/uart_dev_at91usart.c Sun Jan 26 02:41:00 2014
(r261179)
+++ head/sys/arm/at91/uart_dev_at91usart.c Sun Jan 26 04:57:58 2014
(r261180)
@@ -421,7 +421,6 @@ at91_usart_bus_attach(struct uart_softc
{
int err;
int i;
- uint32_t cr;
struct at91_usart_softc *atsc;
atsc = (struct at91_usart_softc *)sc;
@@ -490,8 +489,8 @@ at91_usart_bus_attach(struct uart_softc
}
/* Turn on rx and tx */
- cr = USART_CR_RSTSTA | USART_CR_RSTRX | USART_CR_RSTTX;
- WR4(&sc->sc_bas, USART_CR, cr);
+ DELAY(1000); /* Give pending character a chance to drain. */
+ WR4(&sc->sc_bas, USART_CR, USART_CR_RSTSTA | USART_CR_RSTRX |
USART_CR_RSTTX);
WR4(&sc->sc_bas, USART_CR, USART_CR_RXEN | USART_CR_TXEN);
/*
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