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path: root/drivers/tty/serial/sc16is7xx.c
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Diffstat (limited to 'drivers/tty/serial/sc16is7xx.c')
-rw-r--r--drivers/tty/serial/sc16is7xx.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index f36e6df2fa90..a9d94f7cf683 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -1205,6 +1205,10 @@ static int sc16is7xx_probe(struct device *dev,
}
#endif
+ /* reset device, purging any pending irq / data */
+ regmap_write(s->regmap, SC16IS7XX_IOCONTROL_REG << SC16IS7XX_REG_SHIFT,
+ SC16IS7XX_IOCONTROL_SRESET_BIT);
+
for (i = 0; i < devtype->nr_uart; ++i) {
s->p[i].line = i;
/* Initialize port data */
@@ -1234,6 +1238,22 @@ static int sc16is7xx_probe(struct device *dev,
init_kthread_work(&s->p[i].reg_work, sc16is7xx_reg_proc);
/* Register port */
uart_add_one_port(&sc16is7xx_uart, &s->p[i].port);
+
+ /* Enable EFR */
+ sc16is7xx_port_write(&s->p[i].port, SC16IS7XX_LCR_REG,
+ SC16IS7XX_LCR_CONF_MODE_B);
+
+ regcache_cache_bypass(s->regmap, true);
+
+ /* Enable write access to enhanced features */
+ sc16is7xx_port_write(&s->p[i].port, SC16IS7XX_EFR_REG,
+ SC16IS7XX_EFR_ENABLE_BIT);
+
+ regcache_cache_bypass(s->regmap, false);
+
+ /* Restore access to general registers */
+ sc16is7xx_port_write(&s->p[i].port, SC16IS7XX_LCR_REG, 0x00);
+
/* Go to suspend mode */
sc16is7xx_power(&s->p[i].port, 0);
}