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[59.120.186.245]) by smtp.gmail.com with ESMTPSA id c1sm3363317pgq.33.2019.04.18.19.45.41 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 18 Apr 2019 19:45:41 -0700 (PDT) From: "Ji-Ze Hong (Peter Hong)" X-Google-Original-From: "Ji-Ze Hong (Peter Hong)" To: peter_hong@fintek.com.tw, johan@kernel.org, gregkh@linuxfoundation.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, "Ji-Ze Hong (Peter Hong)" , Oliver Neukum Subject: [PATCH V8 1/4] USB: serial: f81232: clear overrun flag Date: Fri, 19 Apr 2019 10:45:30 +0800 Message-Id: <1555641933-19336-1-git-send-email-hpeter+linux_kernel@gmail.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Signed-off-by: Ji-Ze Hong (Peter Hong) --- v8: 1: Fix usb_submit_urb() in f81232_resume() with GFP_NOIO, not GFP_KERNEL. v7: 1: Remove serial->suspending check 2: Add port priv is_port_open to save port open state. We'll register interrupt-in urb in f81232_resume() when port is opened. 3: Using usb_kill_urb for read/interrupt urb to ensure urb stopped. v6: 1: Add deferred_lsr_work_needed to re-trigger when f81232_resume() 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 | 97 +++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 89 insertions(+), 8 deletions(-) diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c index 0dcdcb4b2cde..1f0dd4087d79 100644 --- a/drivers/usb/serial/f81232.c +++ b/drivers/usb/serial/f81232.c @@ -41,12 +41,15 @@ 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; + bool is_port_open; + struct work_struct lsr_work; struct work_struct interrupt_work; struct usb_serial_port *port; }; @@ -282,6 +285,7 @@ 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 f81232_private *priv = usb_get_serial_port_data(port); unsigned char *data = urb->transfer_buffer; char tty_flag; unsigned int i; @@ -315,6 +319,7 @@ 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); } @@ -528,37 +533,52 @@ static int f81232_tiocmset(struct tty_struct *tty, static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port) { - int result; - - result = f81232_port_enable(port); - if (result) - return result; + struct f81232_private *port_priv = usb_get_serial_port_data(port); + int result = 0; /* Setup termios */ if (tty) f81232_set_termios(tty, port, NULL); + mutex_lock(&port_priv->lock); + + result = f81232_port_enable(port); + if (result) + goto end; + result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); if (result) { dev_err(&port->dev, "%s - failed submitting interrupt urb," " error %d\n", __func__, result); - return result; + goto end; } result = usb_serial_generic_open(tty, port); if (result) { usb_kill_urb(port->interrupt_in_urb); - return result; + goto end; } - return 0; + port_priv->is_port_open = true; +end: + mutex_unlock(&port_priv->lock); + + return result; } static void f81232_close(struct usb_serial_port *port) { + struct f81232_private *port_priv = usb_get_serial_port_data(port); + + mutex_lock(&port_priv->lock); + f81232_port_disable(port); usb_serial_generic_close(port); usb_kill_urb(port->interrupt_in_urb); + flush_work(&port_priv->lsr_work); + port_priv->is_port_open = false; + + mutex_unlock(&port_priv->lock); } static void f81232_dtr_rts(struct usb_serial_port *port, int on) @@ -603,6 +623,21 @@ 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 +648,7 @@ 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 +668,49 @@ 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 usb_serial_port *port = serial->port[0]; + struct f81232_private *port_priv = usb_get_serial_port_data(port); + int i; + + for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) + usb_kill_urb(port->read_urbs[i]); + + usb_kill_urb(port->interrupt_in_urb); + + if (port_priv) + flush_work(&port_priv->lsr_work); + + return 0; +} + +static int f81232_resume(struct usb_serial *serial) +{ + struct usb_serial_port *port = serial->port[0]; + struct f81232_private *port_priv = usb_get_serial_port_data(port); + int result = 0; + + mutex_lock(&port_priv->lock); + + if (port_priv && port_priv->is_port_open) { + result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO); + if (result) { + dev_err(&port->dev, + "%s: submit interrupt urb failed: %d", + __func__, result); + goto end; + } + } + + result = usb_serial_generic_resume(serial); + +end: + mutex_unlock(&port_priv->lock); + + return result; +} + static struct usb_serial_driver f81232_device = { .driver = { .owner = THIS_MODULE, @@ -655,6 +734,8 @@ 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, + .resume = f81232_resume, }; static struct usb_serial_driver * const serial_drivers[] = { -- 2.7.4