Thread (6 messages) 6 messages, 2 authors, 2016-08-30

[PATCH 1/3] clocksource/drivers/timer-atmel-pit: Enable mck clock

From: mark.rutland@arm.com (Mark Rutland)
Date: 2016-08-30 09:56:09
Also in: lkml
Subsystem: clocksource, clockevent drivers, the rest · Maintainers: Daniel Lezcano, Thomas Gleixner, Linus Torvalds

Hi,

On Fri, Aug 26, 2016 at 04:20:43PM +0200, Daniel Lezcano wrote:
quoted hunk ↗ jump to hunk
From: Alexandre Belloni <redacted>

mck is needed to get the PIT working. Explicitly prepare_enable it instead
of assuming it is enabled.

This solves an issue where the system is freezing when the ETM/ETB drivers
are enabled.

Reported-by: Olivier Schonken <redacted>
Reviewed-by: Boris Brezillon <redacted>
Acked-by: Nicolas Ferre <redacted>
Signed-off-by: Alexandre Belloni <redacted>
Signed-off-by: Daniel Lezcano <redacted>
---
 drivers/clocksource/timer-atmel-pit.c | 6 ++++++
 1 file changed, 6 insertions(+)
diff --git a/drivers/clocksource/timer-atmel-pit.c b/drivers/clocksource/timer-atmel-pit.c
index 1ffac0c..3494bc5 100644
--- a/drivers/clocksource/timer-atmel-pit.c
+++ b/drivers/clocksource/timer-atmel-pit.c
@@ -261,6 +261,12 @@ static int __init at91sam926x_pit_dt_init(struct device_node *node)
 		return PTR_ERR(data->mck);
 	}
 
+	ret = clk_prepare_enable(data->mck);
+	if (ret) {
+		pr_err("Unable to enable mck\n");
+		return ret;
+	}
+
Apologies if the below is a duplicate report.

When building v4.8-rc4 multi_v7_defconfig, I get:

[mark at leverpostej:~/src/linux]% uselinaro 15.08 make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j10 -s
drivers/clocksource/timer-atmel-pit.c: In function 'at91sam926x_pit_dt_init':
drivers/clocksource/timer-atmel-pit.c:264:2: error: 'ret' undeclared (first use in this function)
  ret = clk_prepare_enable(data->mck);
  ^
drivers/clocksource/timer-atmel-pit.c:264:2: note: each undeclared identifier is reported only once for each function it appears in
make[2]: *** [drivers/clocksource/timer-atmel-pit.o] Error 1
make[1]: *** [drivers/clocksource] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [drivers] Error 2

As far as I can see, there's no local 'ret' variable. Locally I've fixed this
up with:

----8----
diff --git a/drivers/clocksource/timer-atmel-pit.c b/drivers/clocksource/timer-atmel-pit.c
index 3494bc5..7f0f5b2 100644
--- a/drivers/clocksource/timer-atmel-pit.c
+++ b/drivers/clocksource/timer-atmel-pit.c
@@ -240,6 +240,7 @@ static int __init at91sam926x_pit_common_init(struct pit_data *data)
 static int __init at91sam926x_pit_dt_init(struct device_node *node)
 {
        struct pit_data *data;
+       int ret;
 
        data = kzalloc(sizeof(*data), GFP_KERNEL);
        if (!data)
---->8----
Thanks,
Mark.
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