If we have stdout-path specified for earlycon, we must prevent
the debug console from idling until runtime PM kicks in.
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
---
drivers/bus/ti-sysc.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 46 insertions(+)
diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -206,6 +206,50 @@ static int sysc_parse_and_check_child_range(struct sysc *ddata)
return 0;
}
+static struct device_node *stdout_path;
+
+static void sysc_init_stdout_path(struct sysc *ddata)
+{
+ struct device_node *np = NULL;
+ const char *uart;
+
+ if (IS_ERR(stdout_path))
+ return;
+
+ if (stdout_path)
+ return;
+
+ np = of_find_node_by_path("/chosen");
+ if (!np)
+ goto err;
+
+ uart = of_get_property(np, "stdout-path", NULL);
+ if (!uart)
+ goto err;
+
+ np = of_find_node_by_path(uart);
+ if (!np)
+ goto err;
+
+ stdout_path = np;
+
+ return;
+
+err:
+ stdout_path = ERR_PTR(-ENODEV);
+}
+
+static void sysc_check_quirk_stdout(struct sysc *ddata,
+ struct device_node *np)
+{
+ sysc_init_stdout_path(ddata);
+ if (np != stdout_path)
+ return;
+
+ ddata->cfg.quirks |= SYSC_QUIRK_NO_IDLE_ON_INIT |
+ SYSC_QUIRK_NO_RESET_ON_INIT;
+}
+
/**
* sysc_check_one_child - check child configuration
* @ddata: device driver data
@@ -224,6 +268,8 @@ static int sysc_check_one_child(struct sysc *ddata,
if (name)
dev_warn(ddata->dev, "really a child ti,hwmods property?");
+ sysc_check_quirk_stdout(ddata, np);
+
return 0;
}
--
2.16.2
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
