diff options
| -rw-r--r-- | hw/char/serial.c | 30 |
1 files changed, 19 insertions, 11 deletions
diff --git a/hw/char/serial.c b/hw/char/serial.c index 66b6348867..bd6813e667 100644 --- a/hw/char/serial.c +++ b/hw/char/serial.c @@ -263,8 +263,9 @@ static gboolean serial_xmit(GIOChannel *chan, GIOCondition cond, void *opaque) if (s->tsr_retry <= 0) { if (s->fcr & UART_FCR_FE) { s->tsr = fifo_get(s,XMIT_FIFO); - if (!s->xmit_fifo.count) + if (!s->xmit_fifo.count) { s->lsr |= UART_LSR_THRE; + } } else if ((s->lsr & UART_LSR_THRE)) { return FALSE; } else { @@ -461,10 +462,11 @@ static uint64_t serial_ioport_read(void *opaque, hwaddr addr, unsigned size) } else { if(s->fcr & UART_FCR_FE) { ret = fifo_get(s,RECV_FIFO); - if (s->recv_fifo.count == 0) + if (s->recv_fifo.count == 0) { s->lsr &= ~(UART_LSR_DR | UART_LSR_BI); - else + } else { qemu_mod_timer(s->fifo_timeout_timer, qemu_get_clock_ns (vm_clock) + s->char_transmit_time * 4); + } s->timeout_ipending = 0; } else { ret = s->rbr; @@ -534,15 +536,21 @@ static uint64_t serial_ioport_read(void *opaque, hwaddr addr, unsigned size) static int serial_can_receive(SerialState *s) { if(s->fcr & UART_FCR_FE) { - if(s->recv_fifo.count < UART_FIFO_LENGTH) - /* Advertise (fifo.itl - fifo.count) bytes when count < ITL, and 1 if above. If UART_FIFO_LENGTH - fifo.count is - advertised the effect will be to almost always fill the fifo completely before the guest has a chance to respond, - effectively overriding the ITL that the guest has set. */ - return (s->recv_fifo.count <= s->recv_fifo.itl) ? s->recv_fifo.itl - s->recv_fifo.count : 1; - else - return 0; + if (s->recv_fifo.count < UART_FIFO_LENGTH) { + /* + * Advertise (fifo.itl - fifo.count) bytes when count < ITL, and 1 + * if above. If UART_FIFO_LENGTH - fifo.count is advertised the + * effect will be to almost always fill the fifo completely before + * the guest has a chance to respond, effectively overriding the ITL + * that the guest has set. + */ + return (s->recv_fifo.count <= s->recv_fifo.itl) ? + s->recv_fifo.itl - s->recv_fifo.count : 1; + } else { + return 0; + } } else { - return !(s->lsr & UART_LSR_DR); + return !(s->lsr & UART_LSR_DR); } } |