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sc16is7xx: use kworker for RS-485 configuration

Browse source 
RS-485 configuration is also done under the spinlock
so no blocking I/O allowed.

Signed-off-by: Jakub Kicinski <kubakici@wp.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jakub Kicinski 2015-05-29 21:20:33 +02:00 committed by Greg Kroah-Hartman
parent 059d581530
commit 478d1051a0
1 changed files with 29 additions and 12 deletions
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41
drivers/tty/serial/sc16is7xx.c
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@ -303,6 +303,7 @@ struct sc16is7xx_devtype {
#define SC16IS7XX_RECONF_MD (1 << 0)
#define SC16IS7XX_RECONF_IER (1 << 1)
#define SC16IS7XX_RECONF_RS485 (1 << 2)
struct sc16is7xx_one_config {
unsigned int flags;
@ -668,6 +669,26 @@ static void sc16is7xx_tx_proc(struct kthread_work *ws)
sc16is7xx_handle_tx(port);
}
static void sc16is7xx_reconf_rs485(struct uart_port *port)
{
const u32 mask = SC16IS7XX_EFCR_AUTO_RS485_BIT |
SC16IS7XX_EFCR_RTS_INVERT_BIT;
u32 efcr = 0;
struct serial_rs485 *rs485 = &port->rs485;
unsigned long irqflags;
spin_lock_irqsave(&port->lock, irqflags);
if (rs485->flags & SER_RS485_ENABLED) {
efcr |= SC16IS7XX_EFCR_AUTO_RS485_BIT;
if (rs485->flags & SER_RS485_RTS_AFTER_SEND)
efcr |= SC16IS7XX_EFCR_RTS_INVERT_BIT;
}
spin_unlock_irqrestore(&port->lock, irqflags);
sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG, mask, efcr);
}
static void sc16is7xx_reg_proc(struct kthread_work *ws)
{
struct sc16is7xx_one *one = to_sc16is7xx_one(ws, reg_work);
@ -688,6 +709,9 @@ static void sc16is7xx_reg_proc(struct kthread_work *ws)
if (config.flags & SC16IS7XX_RECONF_IER)
sc16is7xx_port_update(&one->port, SC16IS7XX_IER_REG,
config.ier_clear, 0);
if (config.flags & SC16IS7XX_RECONF_RS485)
sc16is7xx_reconf_rs485(&one->port);
}
static void sc16is7xx_ier_clear(struct uart_port *port, u8 bit)
@ -845,9 +869,8 @@ static void sc16is7xx_set_termios(struct uart_port *port,
static int sc16is7xx_config_rs485(struct uart_port *port,
struct serial_rs485 *rs485)
{
const u32 mask = SC16IS7XX_EFCR_AUTO_RS485_BIT |
SC16IS7XX_EFCR_RTS_INVERT_BIT;
u32 efcr = 0;
struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
if (rs485->flags & SER_RS485_ENABLED) {
bool rts_during_rx, rts_during_tx;
@ -855,13 +878,7 @@ static int sc16is7xx_config_rs485(struct uart_port *port,
rts_during_rx = rs485->flags & SER_RS485_RTS_AFTER_SEND;
rts_during_tx = rs485->flags & SER_RS485_RTS_ON_SEND;
efcr |= SC16IS7XX_EFCR_AUTO_RS485_BIT;
if (!rts_during_rx && rts_during_tx)
/* default */;
else if (rts_during_rx && !rts_during_tx)
efcr |= SC16IS7XX_EFCR_RTS_INVERT_BIT;
else
if (rts_during_rx == rts_during_tx)
dev_err(port->dev,
"unsupported RTS signalling on_send:%d after_send:%d - exactly one of RS485 RTS flags should be set\n",
rts_during_tx, rts_during_rx);
@ -875,9 +892,9 @@ static int sc16is7xx_config_rs485(struct uart_port *port,
return -EINVAL;
}
sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG, mask, efcr);
port->rs485 = *rs485;
one->config.flags |= SC16IS7XX_RECONF_RS485;
queue_kthread_work(&s->kworker, &one->reg_work);
return 0;
}