[PATCH v4 1/3] USB: serial: cp210x: Workaround cp2108 Tx queue bug

[Konstantin Shkolnyy]

Occasionally, writing data and immediately closing the port makes cp2108
stop responding. The device has to be unplugged to clear the error.
The failure is induced by shutting down the device while its Tx queue
still has unsent data. This condition is avoided by issuing PURGE command
from the close() callback.

This change is applied to all cp210x devices. Clearing internal queues on
close is generally good.

Signed-off-by: Konstantin Shkolnyy <konstantin.shkolnyy@xxxxxxxxx>
---
 drivers/usb/serial/cp210x.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index eac7cca..8ba1005 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -301,6 +301,14 @@ static struct usb_serial_driver * const serial_drivers[] = {
 #define CONTROL_WRITE_RTS	0x0200
 
 /*
+ * CP210X_PURGE - 16 bits passed in wValue of USB request.
+ * SiLabs app note AN571 gives a strange description of the 4 bits:
+ * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
+ * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
+ */
+#define PURGE_ALL		0x000f
+
+/*
  * cp210x_get_config
  * Reads from the CP210x configuration registers
  * 'size' is specified in bytes.
@@ -475,7 +483,14 @@ static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 
 static void cp210x_close(struct usb_serial_port *port)
 {
+	unsigned int purge_ctl;
+
 	usb_serial_generic_close(port);
+
+	/* Clear both queues; cp2108 needs this to avoid an occasional hang */
+	purge_ctl = PURGE_ALL;
+	cp210x_set_config(port, CP210X_PURGE, &purge_ctl, 2);
+
 	cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
 }
 
-- 
1.8.4.5

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