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authorSebastian Reichel <sre@kernel.org>2017-03-28 18:59:31 +0300
committerMarcel Holtmann <marcel@holtmann.org>2017-04-12 23:12:16 +0300
commitb3f80c8f75efb2e6a817a0e48bf36cd30685a138 (patch)
tree0c87449d8c01772ebb9ec801b0de332a51c90331 /drivers/tty/serdev
parent2f09276769a1f9c515e7767284fb188198ddfed7 (diff)
downloadlinux-b3f80c8f75efb2e6a817a0e48bf36cd30685a138.tar.xz
serdev: add serdev_device_wait_until_sent
Add method, which waits until the transmission buffer has been sent. Note, that the change in ttyport_write_wakeup is related, since tty_wait_until_sent will hang without that change. Acked-by: Rob Herring <robh@kernel.org> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Sebastian Reichel <sre@kernel.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'drivers/tty/serdev')
-rw-r--r--drivers/tty/serdev/core.c11
-rw-r--r--drivers/tty/serdev/serdev-ttyport.c18
2 files changed, 25 insertions, 4 deletions
diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
index f4c6c90add78..a63b74031e22 100644
--- a/drivers/tty/serdev/core.c
+++ b/drivers/tty/serdev/core.c
@@ -173,6 +173,17 @@ void serdev_device_set_flow_control(struct serdev_device *serdev, bool enable)
}
EXPORT_SYMBOL_GPL(serdev_device_set_flow_control);
+void serdev_device_wait_until_sent(struct serdev_device *serdev, long timeout)
+{
+ struct serdev_controller *ctrl = serdev->ctrl;
+
+ if (!ctrl || !ctrl->ops->wait_until_sent)
+ return;
+
+ ctrl->ops->wait_until_sent(ctrl, timeout);
+}
+EXPORT_SYMBOL_GPL(serdev_device_wait_until_sent);
+
static int serdev_drv_probe(struct device *dev)
{
const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c
index d05393594f15..50dc75c4d204 100644
--- a/drivers/tty/serdev/serdev-ttyport.c
+++ b/drivers/tty/serdev/serdev-ttyport.c
@@ -14,6 +14,7 @@
#include <linux/serdev.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
+#include <linux/poll.h>
#define SERPORT_ACTIVE 1
@@ -46,11 +47,11 @@ static void ttyport_write_wakeup(struct tty_port *port)
struct serdev_controller *ctrl = port->client_data;
struct serport *serport = serdev_controller_get_drvdata(ctrl);
- if (!test_and_clear_bit(TTY_DO_WRITE_WAKEUP, &port->tty->flags))
- return;
-
- if (test_bit(SERPORT_ACTIVE, &serport->flags))
+ if (test_and_clear_bit(TTY_DO_WRITE_WAKEUP, &port->tty->flags) &&
+ test_bit(SERPORT_ACTIVE, &serport->flags))
serdev_controller_write_wakeup(ctrl);
+
+ wake_up_interruptible_poll(&port->tty->write_wait, POLLOUT);
}
static const struct tty_port_client_operations client_ops = {
@@ -167,6 +168,14 @@ static void ttyport_set_flow_control(struct serdev_controller *ctrl, bool enable
tty_set_termios(tty, &ktermios);
}
+static void ttyport_wait_until_sent(struct serdev_controller *ctrl, long timeout)
+{
+ struct serport *serport = serdev_controller_get_drvdata(ctrl);
+ struct tty_struct *tty = serport->tty;
+
+ tty_wait_until_sent(tty, timeout);
+}
+
static const struct serdev_controller_ops ctrl_ops = {
.write_buf = ttyport_write_buf,
.write_flush = ttyport_write_flush,
@@ -175,6 +184,7 @@ static const struct serdev_controller_ops ctrl_ops = {
.close = ttyport_close,
.set_flow_control = ttyport_set_flow_control,
.set_baudrate = ttyport_set_baudrate,
+ .wait_until_sent = ttyport_wait_until_sent,
};
struct device *serdev_tty_port_register(struct tty_port *port,