The firmware can notify us when new input data is available, so
let's make sure we wakeup the HVC thread in that case.
Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
---
drivers/tty/hvc/hvc_opal.c | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/hvc/hvc_opal.c b/drivers/tty/hvc/hvc_opal.c
index 6496872..e4f92c1 100644
--- a/drivers/tty/hvc/hvc_opal.c
+++ b/drivers/tty/hvc/hvc_opal.c
@@ -61,6 +61,7 @@ static struct hvc_opal_priv
*hvc_opal_privs[MAX_NR_HVC_CONSOLES];
/* For early boot console */
static struct hvc_opal_priv hvc_opal_boot_priv;
static u32 hvc_opal_boot_termno;
+static bool hvc_opal_event_registered;
static const struct hv_ops hvc_opal_raw_ops = {
.get_chars = opal_get_chars,
@@ -161,6 +162,18 @@ static const struct hv_ops hvc_opal_hvsi_ops = {
.tiocmset = hvc_opal_hvsi_tiocmset,
};
+static int hvc_opal_console_event(struct notifier_block *nb,
+ unsigned long events, void *change)
+{
+ if (events & OPAL_EVENT_CONSOLE_INPUT)
+ hvc_kick();
+ return 0;
+}
+
+static struct notifier_block hvc_opal_console_nb = {
+ .notifier_call = hvc_opal_console_event,
+};
+
static int hvc_opal_probe(struct platform_device *dev)
{
const struct hv_ops *ops;
@@ -170,6 +183,7 @@ static int hvc_opal_probe(struct platform_device *dev)
unsigned int termno, boot = 0;
const __be32 *reg;
+
if (of_device_is_compatible(dev->dev.of_node, "ibm,opal-console-raw")) {
proto = HV_PROTOCOL_RAW;
ops = &hvc_opal_raw_ops;
@@ -213,12 +227,18 @@ static int hvc_opal_probe(struct platform_device *dev)
dev->dev.of_node->full_name,
boot ? " (boot console)" : "");
- /* We don't do IRQ yet */
+ /* We don't do IRQ ... */
hp = hvc_alloc(termno, 0, ops, MAX_VIO_PUT_CHARS);
if (IS_ERR(hp))
return PTR_ERR(hp);
dev_set_drvdata(&dev->dev, hp);
+ /* ... but we use OPAL event to kick the console */
+ if (!hvc_opal_event_registered) {
+ opal_notifier_register(&hvc_opal_console_nb);
+ hvc_opal_event_registered = true;
+ }
+
return 0;
}
@@ -259,6 +279,10 @@ module_init(hvc_opal_init);
static void __exit hvc_opal_exit(void)
{
+ if (hvc_opal_event_registered)
+ opal_notifier_unregister(&hvc_opal_console_nb);
+ hvc_opal_event_registered = false;
+
platform_driver_unregister(&hvc_opal_driver);
}
module_exit(hvc_opal_exit);
--
1.8.3.2
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