mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 17:56:39 +07:00
SERIAL: omap: don't read back LCR/MCR/EFR
There's really no reason to read back these registers while setting the termios modes, provided we keep our cached copies up to date. Remove these readbacks. This has the benefit that we know that the EFR_ECB and MCR_TCRTLR bits will always be clear, so we don't need to keep masking these bits throughout the code. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
parent
01d70bb37c
commit
1fe8aa8803
@ -912,8 +912,11 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
|
||||
/* Enable AUTORTS and AUTOCTS */
|
||||
up->efr |= UART_EFR_CTS | UART_EFR_RTS;
|
||||
|
||||
/* Ensure MCR RTS is asserted */
|
||||
up->mcr |= UART_MCR_RTS;
|
||||
|
||||
/* Disable access to TCR/TLR */
|
||||
serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS);
|
||||
serial_out(up, UART_MCR, up->mcr);
|
||||
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
|
||||
serial_out(up, UART_EFR, up->efr);
|
||||
serial_out(up, UART_LCR, cval);
|
||||
@ -928,10 +931,8 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
|
||||
|
||||
/* Software Flow Control Configuration */
|
||||
if (up->port.flags & UPF_SOFT_FLOW) {
|
||||
up->lcr = serial_in(up, UART_LCR);
|
||||
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
|
||||
up->efr = serial_in(up, UART_EFR);
|
||||
serial_out(up, UART_EFR, up->efr & ~UART_EFR_ECB);
|
||||
serial_out(up, UART_EFR, up->efr);
|
||||
|
||||
serial_out(up, UART_XON1, termios->c_cc[VSTART]);
|
||||
serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]);
|
||||
@ -958,8 +959,6 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
|
||||
serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
|
||||
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
|
||||
|
||||
up->mcr = serial_in(up, UART_MCR);
|
||||
|
||||
/*
|
||||
* IXANY Flag:
|
||||
* Enable any character to restart output.
|
||||
@ -975,7 +974,7 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
|
||||
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
|
||||
serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
|
||||
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
|
||||
serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR);
|
||||
serial_out(up, UART_MCR, up->mcr);
|
||||
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
|
||||
serial_out(up, UART_EFR, up->efr);
|
||||
serial_out(up, UART_LCR, up->lcr);
|
||||
|
Loading…
Reference in New Issue
Block a user