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DM: Mark thre_int_pending as true when THR is empty

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This patch marks thre_int_pending as true when THR is empty.

Tracked-On: #2713
Signed-off-by: Eddie Dong <eddie.dong@intel.com>
Signed-off-by: Kaige Fu <kaige.fu@intel.com>
This commit is contained in:
Kaige Fu 2019-03-14 15:14:18 +00:00 committed by Eddie Dong
parent 9b1e2f4cb4
commit b147c5c649
1 changed files with 29 additions and 15 deletions
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44
devicemodel/hw/uart_core.c
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@ -368,19 +368,6 @@ uart_intr_reason(struct uart_vdev *uart)
return IIR_NOPEND;
}
static void
uart_reset(struct uart_vdev *uart)
{
uint16_t divisor;
divisor = DEFAULT_RCLK / DEFAULT_BAUD / 16;
uart->dll = divisor;
uart->dlh = divisor >> 16;
uart->msr = modem_status(uart->mcr);
rxfifo_reset(uart, 1); /* no fifo until enabled by software */
}
/*
* Toggle the COM port's intr pin depending on whether or not we have an
* interrupt condition to report to the processor.
@ -398,6 +385,24 @@ uart_toggle_intr(struct uart_vdev *uart)
(*uart->intr_assert)(uart->arg);
}
static void
uart_reset(struct uart_vdev *uart)
{
uint16_t divisor;
divisor = DEFAULT_RCLK / DEFAULT_BAUD / 16;
uart->dll = divisor;
uart->dlh = divisor >> 16;
uart->msr = modem_status(uart->mcr);
rxfifo_reset(uart, 1); /* no fifo until enabled by software */
/* set the right reset state here */
uart->ier = 0;
uart->thre_int_pending = true;
uart_toggle_intr(uart);
}
static void
uart_drain(int fd, enum ev_type ev, void *arg)
{
@ -454,12 +459,17 @@ uart_write(struct uart_vdev *uart, int offset, uint8_t value)
switch (offset) {
case REG_DATA:
/* THRE INT is cleared after writing data into THR register */
uart->thre_int_pending = false;
uart_toggle_intr(uart);
if (uart->mcr & MCR_LOOPBACK) {
if (rxfifo_putchar(uart, value) != 0)
uart->lsr |= LSR_OE;
} else if (uart->tty.opened) {
ttywrite(&uart->tty, value);
} /* else drop on floor */
/* We view the transmission is completed immediately */
uart->thre_int_pending = true;
break;
case REG_IER:
@ -580,10 +590,14 @@ uart_read(struct uart_vdev *uart, int offset)
intr_reason = uart_intr_reason(uart);
/*
* Deal with side effects of reading the IIR register
* Reading the IIR register clears the THRE INT.
*/
if (intr_reason == IIR_TXRDY)
if (intr_reason == IIR_TXRDY) {
uart->thre_int_pending = false;
uart_toggle_intr(uart);
}
/* THRE INT is re-generated since the THR register is always empty in here */
uart->thre_int_pending = true;
iir |= intr_reason;