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sc16is7xx: Update status lines in single call

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RTS, DTR and LOOP bits can be updated in a single MCR register update.
This reduces the number of (slow) SPI/I2C bus transactions.

Signed-off-by: Lech Perczak <l.perczak@camlintechnologies.com>
Signed-off-by: Tomasz Moń <tomasz.mon@camlingroup.com>
Link: https://lore.kernel.org/r/20220221105618.3503470-3-tomasz.mon@camlingroup.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lech Perczak 2022-02-21 11:56:14 +01:00 committed by Greg Kroah-Hartman
parent c112653b89
commit 6cca8f154a
1 changed files with 15 additions and 10 deletions
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25
drivers/tty/serial/sc16is7xx.c
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@ -784,19 +784,24 @@ static void sc16is7xx_reg_proc(struct kthread_work *ws)
spin_unlock_irqrestore(&one->port.lock, irqflags);
if (config.flags & SC16IS7XX_RECONF_MD) {
u8 mcr = 0;
/* Device ignores RTS setting when hardware flow is enabled */
if (one->port.mctrl & TIOCM_RTS)
mcr |= SC16IS7XX_MCR_RTS_BIT;
if (one->port.mctrl & TIOCM_DTR)
mcr |= SC16IS7XX_MCR_DTR_BIT;
if (one->port.mctrl & TIOCM_LOOP)
mcr |= SC16IS7XX_MCR_LOOP_BIT;
sc16is7xx_port_update(&one->port, SC16IS7XX_MCR_REG,
SC16IS7XX_MCR_RTS_BIT |
SC16IS7XX_MCR_DTR_BIT |
SC16IS7XX_MCR_LOOP_BIT,
(one->port.mctrl & TIOCM_LOOP) ?
SC16IS7XX_MCR_LOOP_BIT : 0);
sc16is7xx_port_update(&one->port, SC16IS7XX_MCR_REG,
SC16IS7XX_MCR_RTS_BIT,
(one->port.mctrl & TIOCM_RTS) ?
SC16IS7XX_MCR_RTS_BIT : 0);
sc16is7xx_port_update(&one->port, SC16IS7XX_MCR_REG,
SC16IS7XX_MCR_DTR_BIT,
(one->port.mctrl & TIOCM_DTR) ?
SC16IS7XX_MCR_DTR_BIT : 0);
mcr);
}
if (config.flags & SC16IS7XX_RECONF_IER)
sc16is7xx_port_update(&one->port, SC16IS7XX_IER_REG,
config.ier_clear, 0);