diff options
| author | Ji-Ze Hong (Peter Hong) <hpeter@gmail.com> | 2019-04-30 09:22:30 +0800 |
|---|---|---|
| committer | Johan Hovold <johan@kernel.org> | 2019-05-03 09:19:54 +0200 |
| commit | 1c6b7ab2dd0763657fc7cac562976fa01772d040 (patch) | |
| tree | f34149358c77b0305ee7421432f896d4182d91dd /drivers/usb/serial | |
| parent | 804dbee1e49774918339c1e5a87400988c0819e8 (diff) | |
| download | linux-1c6b7ab2dd0763657fc7cac562976fa01772d040.tar.bz2 | |
USB: serial: f81232: clear overrun flag
The F81232 will report data and LSR with bulk like following format:
bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]...
LSR will auto clear frame/parity/break error flag when reading by H/W,
but overrrun will only cleared when reading LSR. So this patch add a
worker to read LSR when overrun and flush the worker on close() &
suspend().
Cc: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Diffstat (limited to 'drivers/usb/serial')
| -rw-r--r-- | drivers/usb/serial/f81232.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c index dee6f2caf9b5..840694bf57c1 100644 --- a/drivers/usb/serial/f81232.c +++ b/drivers/usb/serial/f81232.c @@ -41,12 +41,14 @@ MODULE_DEVICE_TABLE(usb, id_table); #define FIFO_CONTROL_REGISTER (0x02 + SERIAL_BASE_ADDRESS) #define LINE_CONTROL_REGISTER (0x03 + SERIAL_BASE_ADDRESS) #define MODEM_CONTROL_REGISTER (0x04 + SERIAL_BASE_ADDRESS) +#define LINE_STATUS_REGISTER (0x05 + SERIAL_BASE_ADDRESS) #define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS) struct f81232_private { struct mutex lock; u8 modem_control; u8 modem_status; + struct work_struct lsr_work; struct work_struct interrupt_work; struct usb_serial_port *port; }; @@ -282,6 +284,7 @@ exit: static void f81232_process_read_urb(struct urb *urb) { struct usb_serial_port *port = urb->context; + struct f81232_private *priv = usb_get_serial_port_data(port); unsigned char *data = urb->transfer_buffer; char tty_flag; unsigned int i; @@ -315,6 +318,7 @@ static void f81232_process_read_urb(struct urb *urb) if (lsr & UART_LSR_OE) { port->icount.overrun++; + schedule_work(&priv->lsr_work); tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); } @@ -562,6 +566,7 @@ static void f81232_close(struct usb_serial_port *port) usb_serial_generic_close(port); usb_kill_urb(port->interrupt_in_urb); flush_work(&port_priv->interrupt_work); + flush_work(&port_priv->lsr_work); } static void f81232_dtr_rts(struct usb_serial_port *port, int on) @@ -606,6 +611,21 @@ static void f81232_interrupt_work(struct work_struct *work) f81232_read_msr(priv->port); } +static void f81232_lsr_worker(struct work_struct *work) +{ + struct f81232_private *priv; + struct usb_serial_port *port; + int status; + u8 tmp; + + priv = container_of(work, struct f81232_private, lsr_work); + port = priv->port; + + status = f81232_get_register(port, LINE_STATUS_REGISTER, &tmp); + if (status) + dev_warn(&port->dev, "read LSR failed: %d\n", status); +} + static int f81232_port_probe(struct usb_serial_port *port) { struct f81232_private *priv; @@ -616,6 +636,7 @@ static int f81232_port_probe(struct usb_serial_port *port) mutex_init(&priv->lock); INIT_WORK(&priv->interrupt_work, f81232_interrupt_work); + INIT_WORK(&priv->lsr_work, f81232_lsr_worker); usb_set_serial_port_data(port, priv); @@ -646,8 +667,10 @@ static int f81232_suspend(struct usb_serial *serial, pm_message_t message) usb_kill_urb(port->interrupt_in_urb); - if (port_priv) + if (port_priv) { flush_work(&port_priv->interrupt_work); + flush_work(&port_priv->lsr_work); + } return 0; } |