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serial: 8250: enable programmable transmit interrupt mode

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Enable programmable transmit interrupt mode in order to increase
system performance.

Change-Id: Ic1ef9ecae0c6feb00170ad97ee3c6245ca3bf068
Signed-off-by: Huibin Hong <huibin.hong@rock-chips.com>
This commit is contained in:
Huibin Hong
2019-01-25 17:25:35 +08:00
committed by Tao Huang
parent 2a083e031d
commit 44b8b0f5f2
3 changed files with 18 additions and 11 deletions
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3
drivers/tty/serial/8250/8250.h
View File

@@ -139,6 +139,9 @@ static inline bool serial8250_set_THRI(struct uart_8250_port *up)
if (up->ier & UART_IER_THRI)
return false;
up->ier |= UART_IER_THRI;
#if defined(CONFIG_ARCH_ROCKCHIP) && defined(CONFIG_NO_GKI)
up->ier |= UART_IER_PTIME;
#endif
serial_out(up, UART_IER, up->ier);
return true;
}

25
drivers/tty/serial/8250/8250_port.c
View File

@@ -1911,8 +1911,9 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
unsigned char status;
unsigned long flags;
struct uart_8250_port *up = up_to_u8250p(port);
#ifndef CONFIG_ARCH_ROCKCHIP
bool skip_rx = false;
int dma_err = -1;
#endif
if (iir & UART_IIR_NO_INT)
return 0;
@@ -1921,6 +1922,17 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
status = serial_port_in(port, UART_LSR);
#ifdef CONFIG_ARCH_ROCKCHIP
if (status & (UART_LSR_DR | UART_LSR_BI)) {
int dma_err = -1;
if (up->dma && up->dma->rxchan)
dma_err = handle_rx_dma(up, iir);
if (!up->dma || dma_err)
status = serial8250_rx_chars(up, status);
}
#else
/*
* If port is stopped and there are no error conditions in the
* FIFO, then don't drain the FIFO, as this may lead to TTY buffer
@@ -1934,15 +1946,6 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
!(port->read_status_mask & UART_LSR_DR))
skip_rx = true;
#ifdef CONFIG_ARCH_ROCKCHIP
if (status & (UART_LSR_DR | UART_LSR_BI)) {
if (up->dma && up->dma->rxchan)
dma_err = handle_rx_dma(up, iir);
if (!up->dma || dma_err)
status = serial8250_rx_chars(up, status);
}
#else
if (status & (UART_LSR_DR | UART_LSR_BI) && !skip_rx) {
if (!up->dma || handle_rx_dma(up, iir))
status = serial8250_rx_chars(up, status);
@@ -1951,7 +1954,7 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
serial8250_modem_status(up);
#ifdef CONFIG_ARCH_ROCKCHIP
if ((!up->dma || (up->dma && (!up->dma->txchan || up->dma->tx_err))) &&
(status & UART_LSR_THRE))
((iir & 0xf) == UART_IIR_THRI))
serial8250_tx_chars(up);
#else
if ((!up->dma || (up->dma && up->dma->tx_err)) &&

1
include/uapi/linux/serial_reg.h
View File

@@ -30,6 +30,7 @@
* Sleep mode for ST16650 and TI16750. For the ST16650, EFR[4]=1
*/
#define UART_IERX_SLEEP 0x10 /* Enable sleep mode */
#define UART_IER_PTIME 0x80 /* Enable programmable transmit interrupt mode */
#define UART_IIR 2 /* In: Interrupt ID Register */
#define UART_IIR_NO_INT 0x01 /* No interrupts pending */