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serial: 8250: factor out serial8250_{set,clear}_THRI() helpers 

Factor out similar code pieces that set or clear UART_IER_THRI bit to
serial8250_{set,clear}_THRI() helpers.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2019-06-17 16:53:20 +03:00 committed by Greg Kroah-Hartman
parent 099f79c019
commit 7e267b2956
4 changed files with 26 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/tty/serial/8250/8250.h
View File

@ -128,6 +128,24 @@ static inline void serial_dl_write(struct uart_8250_port *up, int value)
up->dl_write(up, value);
}
static inline bool serial8250_set_THRI(struct uart_8250_port *up)
{
if (up->ier & UART_IER_THRI)
return false;
up->ier |= UART_IER_THRI;
serial_out(up, UART_IER, up->ier);
return true;
}
static inline bool serial8250_clear_THRI(struct uart_8250_port *up)
{
if (!(up->ier & UART_IER_THRI))
return false;
up->ier &= ~UART_IER_THRI;
serial_out(up, UART_IER, up->ier);
return true;
}
struct uart_8250_port *serial8250_get_port(int line);
void serial8250_rpm_get(struct uart_8250_port *p);

11
drivers/tty/serial/8250/8250_dma.c
View File

@ -34,10 +34,8 @@ static void __dma_tx_complete(void *param)
uart_write_wakeup(&p->port);
ret = serial8250_tx_dma(p);
if (ret) {
p->ier |= UART_IER_THRI;
serial_port_out(&p->port, UART_IER, p->ier);
}
if (ret)
serial8250_set_THRI(p);
spin_unlock_irqrestore(&p->port.lock, flags);
}
@ -100,10 +98,7 @@ int serial8250_tx_dma(struct uart_8250_port *p)
dma_async_issue_pending(dma->txchan);
if (dma->tx_err) {
dma->tx_err = 0;
if (p->ier & UART_IER_THRI) {
p->ier &= ~UART_IER_THRI;
serial_out(p, UART_IER, p->ier);
}
serial8250_clear_THRI(p);
}
return 0;
err:

14
drivers/tty/serial/8250/8250_omap.c
View File

@ -923,15 +923,13 @@ static void omap_8250_dma_tx_complete(void *param)
ret = omap_8250_tx_dma(p);
if (ret)
en_thri = true;
} else if (p->capabilities & UART_CAP_RPM) {
en_thri = true;
}
if (en_thri) {
dma->tx_err = 1;
p->ier |= UART_IER_THRI;
serial_port_out(&p->port, UART_IER, p->ier);
serial8250_set_THRI(p);
}
spin_unlock_irqrestore(&p->port.lock, flags);
@ -959,10 +957,7 @@ static int omap_8250_tx_dma(struct uart_8250_port *p)
ret = -EBUSY;
goto err;
}
if (p->ier & UART_IER_THRI) {
p->ier &= ~UART_IER_THRI;
serial_out(p, UART_IER, p->ier);
}
serial8250_clear_THRI(p);
return 0;
}
@ -1020,10 +1015,7 @@ static int omap_8250_tx_dma(struct uart_8250_port *p)
if (dma->tx_err)
dma->tx_err = 0;
if (p->ier & UART_IER_THRI) {
p->ier &= ~UART_IER_THRI;
serial_out(p, UART_IER, p->ier);
}
serial8250_clear_THRI(p);
if (skip_byte)
serial_out(p, UART_TX, xmit->buf[xmit->tail]);
return 0;

10
drivers/tty/serial/8250/8250_port.c
View File

@ -1502,11 +1502,8 @@ static void __stop_tx_rs485(struct uart_8250_port *p)
static inline void __do_stop_tx(struct uart_8250_port *p)
{
if (p->ier & UART_IER_THRI) {
p->ier &= ~UART_IER_THRI;
serial_out(p, UART_IER, p->ier);
if (serial8250_clear_THRI(p))
serial8250_rpm_put_tx(p);
}
}
static inline void __stop_tx(struct uart_8250_port *p)
@ -1555,10 +1552,7 @@ static inline void __start_tx(struct uart_port *port)
if (up->dma && !up->dma->tx_dma(up))
return;
if (!(up->ier & UART_IER_THRI)) {
up->ier |= UART_IER_THRI;
serial_port_out(port, UART_IER, up->ier);
if (serial8250_set_THRI(up)) {
if (up->bugs & UART_BUG_TXEN) {
unsigned char lsr;