clocksource/drivers/dw_apb_timers_of: Fix IO endianness causing time jumps

The dw_apb_timer_of timer is using __raw_readl() to access the
timer register, which is causing issues when the system is
running in big endian mode. Fix this by using readl_relaxed()
which should account for the endian settings.

This fixes issues where the time jumps around in the dmesg
output due to returnling __le32 values.

For an example, these two console lines show time running
backwards:

[   49.882572] CPU1: failed to come online
[   43.282457] Brought up 1 CPUs

Signed-off-by: Ben Dooks <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
Acked-by: Nicolas Ferre <[email protected]>
Cc: Dinh Nguyen <[email protected]>
Cc: Linux ARM Kernel <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

diff --git a/drivers/clocksource/dw_apb_timer_of.c b/drivers/clocksource/dw_apb_timer_of.c
index d305fb089767c1b1c51d05f33c1e84e064f728a7..a19a3f619cc755d3a9a04dbdcde24b230cb30d6d 100644 (file)
--- a/drivers/clocksource/dw_apb_timer_of.c
+++ b/drivers/clocksource/dw_apb_timer_of.c
@@ -108,7 +108,7 @@ static void __init add_clocksource(struct device_node *source_timer)
 
 static u64 notrace read_sched_clock(void)
 {
-       return ~__raw_readl(sched_io_base);
+       return ~readl_relaxed(sched_io_base);
 }
 
 static const struct of_device_id sptimer_ids[] __initconst = {