diff options
Diffstat (limited to 'drivers/tty/serial/sc16is7xx.c')
| -rw-r--r-- | drivers/tty/serial/sc16is7xx.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index edb5305b9..13f8d5f70 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -389,6 +389,13 @@ static void sc16is7xx_fifo_write(struct uart_port *port, u8 to_send) const u8 line = sc16is7xx_line(port); u8 addr = (SC16IS7XX_THR_REG << SC16IS7XX_REG_SHIFT) | line; + /* + * Don't send zero-length data, at least on SPI it confuses the chip + * delivering wrong TXLVL data. + */ + if (unlikely(!to_send)) + return; + regcache_cache_bypass(s->regmap, true); regmap_raw_write(s->regmap, addr, s->buf, to_send); regcache_cache_bypass(s->regmap, false); @@ -630,6 +637,12 @@ static void sc16is7xx_handle_tx(struct uart_port *port) if (likely(to_send)) { /* Limit to size of TX FIFO */ txlen = sc16is7xx_port_read(port, SC16IS7XX_TXLVL_REG); + if (txlen > SC16IS7XX_FIFO_SIZE) { + dev_err_ratelimited(port->dev, + "chip reports %d free bytes in TX fifo, but it only has %d", + txlen, SC16IS7XX_FIFO_SIZE); + txlen = 0; + } to_send = (to_send > txlen) ? txlen : to_send; /* Add data to send */ @@ -1180,7 +1193,7 @@ static int sc16is7xx_probe(struct device *dev, if (devtype->nr_gpio) { /* Setup GPIO cotroller */ s->gpio.owner = THIS_MODULE; - s->gpio.dev = dev; + s->gpio.parent = dev; s->gpio.label = dev_name(dev); s->gpio.direction_input = sc16is7xx_gpio_direction_input; s->gpio.get = sc16is7xx_gpio_get; |