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 <[email protected]>
Signed-off-by: Ji-Ze Hong (Peter Hong) <[email protected]>
---
v5:
1: Source code base revert to v3 and remove all v4 changes.
2: Add serial->suspending check in f81232_process_read_urb()
before schedule_work(&priv->lsr_work) to avoid race condition.
v4:
1: Add serial->suspending check in f81232_lsr_worker() to avoid
re-trigger
2: Add port_priv-lsr_work_resched to re-trigger LSR worker
v3:
1: Add flush_work(&port_priv->lsr_work) in f81232_suspend().
v2:
1: Add flush_work(&port_priv->lsr_work) in f81232_close().
drivers/usb/serial/f81232.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 0dcdcb4b2cde..d8a0bb7a41f0 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 +284,8 @@ static void f81232_read_int_callback(struct urb *urb)
static void f81232_process_read_urb(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
+ struct usb_serial *serial = port->serial;
+ struct f81232_private *priv = usb_get_serial_port_data(port);
unsigned char *data = urb->transfer_buffer;
char tty_flag;
unsigned int i;
@@ -315,6 +319,9 @@ static void f81232_process_read_urb(struct urb *urb)
if (lsr & UART_LSR_OE) {
port->icount.overrun++;
+
+ if (!serial->suspending)
+ schedule_work(&priv->lsr_work);
tty_insert_flip_char(&port->port, 0,
TTY_OVERRUN);
}
@@ -556,9 +563,12 @@ static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
static void f81232_close(struct usb_serial_port *port)
{
+ struct f81232_private *port_priv = usb_get_serial_port_data(port);
+
f81232_port_disable(port);
usb_serial_generic_close(port);
usb_kill_urb(port->interrupt_in_urb);
+ flush_work(&port_priv->lsr_work);
}
static void f81232_dtr_rts(struct usb_serial_port *port, int on)
@@ -603,6 +613,21 @@ 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;
@@ -613,6 +638,7 @@ 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);
@@ -632,6 +658,16 @@ static int f81232_port_remove(struct usb_serial_port *port)
return 0;
}
+static int f81232_suspend(struct usb_serial *serial, pm_message_t message)
+{
+ struct f81232_private *port_priv;
+
+ port_priv = usb_get_serial_port_data(serial->port[0]);
+ flush_work(&port_priv->lsr_work);
+
+ return 0;
+}
+
static struct usb_serial_driver f81232_device = {
.driver = {
.owner = THIS_MODULE,
@@ -655,6 +691,7 @@ static struct usb_serial_driver f81232_device = {
.read_int_callback = f81232_read_int_callback,
.port_probe = f81232_port_probe,
.port_remove = f81232_port_remove,
+ .suspend = f81232_suspend,
};
static struct usb_serial_driver * const serial_drivers[] = {
--
2.7.4
The F81232 had 4 clocksource 1.846/18.46/14.77/24MHz and baud rates
can be up to 1.5Mbits with 24MHz.
F81232 Clock registers (106h)
Bit1-0: Clock source selector
00: 1.846MHz.
01: 18.46MHz.
10: 24MHz.
11: 14.77MHz.
Signed-off-by: Ji-Ze Hong (Peter Hong) <[email protected]>
---
v5:
1: no change
v4:
1: no change
v3:
1: change the baud_base in f81232_get_serial_info()
drivers/usb/serial/f81232.c | 105 +++++++++++++++++++++++++++++++++++++++-----
1 file changed, 94 insertions(+), 11 deletions(-)
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index d8a0bb7a41f0..32eff8fad56a 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -28,7 +28,8 @@ static const struct usb_device_id id_table[] = {
MODULE_DEVICE_TABLE(usb, id_table);
/* Maximum baudrate for F81232 */
-#define F81232_MAX_BAUDRATE 115200
+#define F81232_MAX_BAUDRATE 1500000
+#define F81232_DEF_BAUDRATE 9600
/* USB Control EP parameter */
#define F81232_REGISTER_REQUEST 0xa0
@@ -44,18 +45,42 @@ MODULE_DEVICE_TABLE(usb, id_table);
#define LINE_STATUS_REGISTER (0x05 + SERIAL_BASE_ADDRESS)
#define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
+/*
+ * F81232 Clock registers (106h)
+ *
+ * Bit1-0: Clock source selector
+ * 00: 1.846MHz.
+ * 01: 18.46MHz.
+ * 10: 24MHz.
+ * 11: 14.77MHz.
+ */
+#define F81232_CLK_REGISTER 0x106
+#define F81232_CLK_1_846_MHZ 0
+#define F81232_CLK_18_46_MHZ BIT(0)
+#define F81232_CLK_24_MHZ BIT(1)
+#define F81232_CLK_14_77_MHZ (BIT(1) | BIT(0))
+#define F81232_CLK_MASK GENMASK(1, 0)
+
struct f81232_private {
struct mutex lock;
u8 modem_control;
u8 modem_status;
+ speed_t baud_base;
struct work_struct lsr_work;
struct work_struct interrupt_work;
struct usb_serial_port *port;
};
-static int calc_baud_divisor(speed_t baudrate)
+static u32 const baudrate_table[] = { 115200, 921600, 1152000, 1500000 };
+static u8 const clock_table[] = { F81232_CLK_1_846_MHZ, F81232_CLK_14_77_MHZ,
+ F81232_CLK_18_46_MHZ, F81232_CLK_24_MHZ };
+
+static int calc_baud_divisor(speed_t baudrate, speed_t clockrate)
{
- return DIV_ROUND_CLOSEST(F81232_MAX_BAUDRATE, baudrate);
+ if (!baudrate)
+ return 0;
+
+ return DIV_ROUND_CLOSEST(clockrate, baudrate);
}
static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val)
@@ -129,6 +154,21 @@ static int f81232_set_register(struct usb_serial_port *port, u16 reg, u8 val)
return status;
}
+static int f81232_set_mask_register(struct usb_serial_port *port, u16 reg,
+ u8 mask, u8 val)
+{
+ int status;
+ u8 tmp;
+
+ status = f81232_get_register(port, reg, &tmp);
+ if (status)
+ return status;
+
+ tmp = (tmp & ~mask) | (val & mask);
+
+ return f81232_set_register(port, reg, tmp);
+}
+
static void f81232_read_msr(struct usb_serial_port *port)
{
int status;
@@ -349,13 +389,53 @@ static void f81232_break_ctl(struct tty_struct *tty, int break_state)
*/
}
-static void f81232_set_baudrate(struct usb_serial_port *port, speed_t baudrate)
+static int f81232_find_clk(speed_t baudrate)
+{
+ int idx;
+
+ for (idx = 0; idx < ARRAY_SIZE(baudrate_table); ++idx) {
+ if (baudrate <= baudrate_table[idx] &&
+ baudrate_table[idx] % baudrate == 0)
+ return idx;
+ }
+
+ return -EINVAL;
+}
+
+static void f81232_set_baudrate(struct tty_struct *tty,
+ struct usb_serial_port *port, speed_t baudrate,
+ speed_t old_baudrate)
{
+ struct f81232_private *priv = usb_get_serial_port_data(port);
u8 lcr;
int divisor;
int status = 0;
+ int i;
+ int idx;
+ speed_t baud_list[] = {baudrate, old_baudrate, F81232_DEF_BAUDRATE};
+
+ for (i = 0; i < ARRAY_SIZE(baud_list); ++i) {
+ idx = f81232_find_clk(baud_list[i]);
+ if (idx >= 0) {
+ baudrate = baud_list[i];
+ tty_encode_baud_rate(tty, baudrate, baudrate);
+ break;
+ }
+ }
- divisor = calc_baud_divisor(baudrate);
+ if (idx < 0)
+ return;
+
+ priv->baud_base = baudrate_table[idx];
+ divisor = calc_baud_divisor(baudrate, priv->baud_base);
+
+ status = f81232_set_mask_register(port, F81232_CLK_REGISTER,
+ F81232_CLK_MASK, clock_table[idx]);
+ if (status) {
+ dev_err(&port->dev, "%s failed to set CLK_REG: %d\n",
+ __func__, status);
+ return;
+ }
status = f81232_get_register(port, LINE_CONTROL_REGISTER,
&lcr); /* get LCR */
@@ -445,6 +525,7 @@ static void f81232_set_termios(struct tty_struct *tty,
u8 new_lcr = 0;
int status = 0;
speed_t baudrate;
+ speed_t old_baud;
/* Don't change anything if nothing has changed */
if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
@@ -457,11 +538,12 @@ static void f81232_set_termios(struct tty_struct *tty,
baudrate = tty_get_baud_rate(tty);
if (baudrate > 0) {
- if (baudrate > F81232_MAX_BAUDRATE) {
- baudrate = F81232_MAX_BAUDRATE;
- tty_encode_baud_rate(tty, baudrate, baudrate);
- }
- f81232_set_baudrate(port, baudrate);
+ if (old_termios)
+ old_baud = tty_termios_baud_rate(old_termios);
+ else
+ old_baud = F81232_DEF_BAUDRATE;
+
+ f81232_set_baudrate(tty, port, baudrate, old_baud);
}
if (C_PARENB(tty)) {
@@ -597,11 +679,12 @@ static int f81232_get_serial_info(struct tty_struct *tty,
struct serial_struct *ss)
{
struct usb_serial_port *port = tty->driver_data;
+ struct f81232_private *priv = usb_get_serial_port_data(port);
ss->type = PORT_16550A;
ss->line = port->minor;
ss->port = port->port_number;
- ss->baud_base = F81232_MAX_BAUDRATE;
+ ss->baud_base = priv->baud_base;
return 0;
}
--
2.7.4
Implement Fintek F81232 break on/off with LCR register.
It's the same with 16550A LCR register layout.
Signed-off-by: Ji-Ze Hong (Peter Hong) <[email protected]>
---
v5:
1: no change
v4:
1: no change
v3:
1: using shadow_lcr to save LCR in f81232_break_ctl()
drivers/usb/serial/f81232.c | 29 +++++++++++++++++++++++------
1 file changed, 23 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 32eff8fad56a..fe28657b4064 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -65,6 +65,7 @@ struct f81232_private {
struct mutex lock;
u8 modem_control;
u8 modem_status;
+ u8 shadow_lcr;
speed_t baud_base;
struct work_struct lsr_work;
struct work_struct interrupt_work;
@@ -380,13 +381,23 @@ static void f81232_process_read_urb(struct urb *urb)
static void f81232_break_ctl(struct tty_struct *tty, int break_state)
{
- /* FIXME - Stubbed out for now */
+ struct usb_serial_port *port = tty->driver_data;
+ struct f81232_private *priv = usb_get_serial_port_data(port);
+ int status;
- /*
- * break_state = -1 to turn on break, and 0 to turn off break
- * see drivers/char/tty_io.c to see it used.
- * last_set_data_urb_value NEVER has the break bit set in it.
- */
+ mutex_lock(&priv->lock);
+
+ if (break_state)
+ priv->shadow_lcr |= UART_LCR_SBC;
+ else
+ priv->shadow_lcr &= ~UART_LCR_SBC;
+
+ status = f81232_set_register(port, LINE_CONTROL_REGISTER,
+ priv->shadow_lcr);
+ if (status)
+ dev_err(&port->dev, "set break failed: %d\n", status);
+
+ mutex_unlock(&priv->lock);
}
static int f81232_find_clk(speed_t baudrate)
@@ -522,6 +533,7 @@ static int f81232_port_disable(struct usb_serial_port *port)
static void f81232_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
+ struct f81232_private *priv = usb_get_serial_port_data(port);
u8 new_lcr = 0;
int status = 0;
speed_t baudrate;
@@ -575,11 +587,16 @@ static void f81232_set_termios(struct tty_struct *tty,
break;
}
+ mutex_lock(&priv->lock);
+
+ new_lcr |= (priv->shadow_lcr & UART_LCR_SBC);
status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr);
if (status) {
dev_err(&port->dev, "%s failed to set LCR: %d\n",
__func__, status);
}
+
+ mutex_unlock(&priv->lock);
}
static int f81232_tiocmget(struct tty_struct *tty)
--
2.7.4
On Mi, 2019-04-03 at 14:26 +0800, Ji-Ze Hong (Peter Hong) wrote:
> 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().
Hi,
I am most sorry to complain again. Please forgive me for being less
clear than necessary.
>
> Cc: Oliver Neukum <[email protected]>
> Signed-off-by: Ji-Ze Hong (Peter Hong) <[email protected]>
> ---
> v5:
> 1: Source code base revert to v3 and remove all v4 changes.
> 2: Add serial->suspending check in f81232_process_read_urb()
> before schedule_work(&priv->lsr_work) to avoid race condition.
>
> v4:
> 1: Add serial->suspending check in f81232_lsr_worker() to avoid
> re-trigger
> 2: Add port_priv-lsr_work_resched to re-trigger LSR worker
>
> v3:
> 1: Add flush_work(&port_priv->lsr_work) in f81232_suspend().
>
> v2:
> 1: Add flush_work(&port_priv->lsr_work) in f81232_close().
>
> drivers/usb/serial/f81232.c | 37 +++++++++++++++++++++++++++++++++++++
> 1 file changed, 37 insertions(+)
>
> diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
> index 0dcdcb4b2cde..d8a0bb7a41f0 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;
Here you need a flag
bool deferred_lsr_work_needed;
> + struct work_struct lsr_work;
> struct work_struct interrupt_work;
> struct usb_serial_port *port;
> };
> @@ -282,6 +284,8 @@ static void f81232_read_int_callback(struct urb *urb)
> static void f81232_process_read_urb(struct urb *urb)
> {
> struct usb_serial_port *port = urb->context;
> + struct usb_serial *serial = port->serial;
> + struct f81232_private *priv = usb_get_serial_port_data(port);
> unsigned char *data = urb->transfer_buffer;
> char tty_flag;
> unsigned int i;
> @@ -315,6 +319,9 @@ static void f81232_process_read_urb(struct urb *urb)
>
> if (lsr & UART_LSR_OE) {
> port->icount.overrun++;
> +
> + if (!serial->suspending)
> + schedule_work(&priv->lsr_work);
Yes, but you cannot just drop it. You also need
else
priv->deferred_lsr_work_needed = true;
> tty_insert_flip_char(&port->port, 0,
> TTY_OVERRUN);
> }
> @@ -556,9 +563,12 @@ static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
>
> static void f81232_close(struct usb_serial_port *port)
> {
> + struct f81232_private *port_priv = usb_get_serial_port_data(port);
> +
> f81232_port_disable(port);
> usb_serial_generic_close(port);
> usb_kill_urb(port->interrupt_in_urb);
> + flush_work(&port_priv->lsr_work);
> }
>
> static void f81232_dtr_rts(struct usb_serial_port *port, int on)
> @@ -603,6 +613,21 @@ 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;
> @@ -613,6 +638,7 @@ 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);
>
> @@ -632,6 +658,16 @@ static int f81232_port_remove(struct usb_serial_port *port)
> return 0;
> }
>
> +static int f81232_suspend(struct usb_serial *serial, pm_message_t message)
> +{
> + struct f81232_private *port_priv;
> +
> + port_priv = usb_get_serial_port_data(serial->port[0]);
> + flush_work(&port_priv->lsr_work);
> +
> + return 0;
> +}
And you do need a resume, which you had in version v4 to check
the deferred_lsr_work_needed flag and schedule the work if it is
set.
Most sorry
Oliver