]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commitdiff
tty/hvc_opal: Kick the HVC thread on OPAL console events
authorBenjamin Herrenschmidt <benh@kernel.crashing.org>
Fri, 28 Mar 2014 02:36:32 +0000 (13:36 +1100)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Mon, 7 Apr 2014 00:34:27 +0000 (10:34 +1000)
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 <benh@kernel.crashing.org>
drivers/tty/hvc/hvc_opal.c

index b01659bd4f7c2163803d64f3fe83cfe063720bf7..a585079b4b38822a03770b6d3c6ab8fd0bbea036 100644 (file)
@@ -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;
 }