Commit-ID: 95c19a06ec1cf9530ebb8f2c7eeda1d7398b43f1
Gitweb: http://git.kernel.org/tip/95c19a06ec1cf9530ebb8f2c7eeda1d7398b43f1
Author: Xiubo Li <Li.Xiubo@xxxxxxxxxxxxx>
AuthorDate: Wed, 23 Apr 2014 10:12:00 +0800
Committer: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
CommitDate: Fri, 23 May 2014 09:19:40 +0200
clocksource: Fix clocksource_mmio_readX_down
For some clocksource devices, for example, the registers are 32-bit, while
the lower 16-bit is used for timer counting(And reading the upper 16-bit
will return 0).
For example, when the counter value is 0x00001111, and then the
~readl_relaxed(to_mmio_clksrc(c)->reg) will return the value of 0xFFFFEEEE,
but it should be 0x0000EEEE.
So just using the c->mask to mask the unused bits.
Signed-off-by: Xiubo Li <Li.Xiubo@xxxxxxxxxxxxx>
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
---
drivers/clocksource/mmio.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/clocksource/mmio.c b/drivers/clocksource/mmio.c
index 19a6b3f..1593ade 100644
--- a/drivers/clocksource/mmio.c
+++ b/drivers/clocksource/mmio.c
@@ -27,7 +27,7 @@ cycle_t clocksource_mmio_readl_up(struct clocksource *c)
cycle_t clocksource_mmio_readl_down(struct clocksource *c)
{
- return ~(cycle_t)readl_relaxed(to_mmio_clksrc(c)->reg);
+ return ~(cycle_t)readl_relaxed(to_mmio_clksrc(c)->reg) & c->mask;
}
cycle_t clocksource_mmio_readw_up(struct clocksource *c)
@@ -37,7 +37,7 @@ cycle_t clocksource_mmio_readw_up(struct clocksource *c)
cycle_t clocksource_mmio_readw_down(struct clocksource *c)
{
- return ~(cycle_t)readw_relaxed(to_mmio_clksrc(c)->reg);
+ return ~(cycle_t)readw_relaxed(to_mmio_clksrc(c)->reg) & c->mask;
}
/**
--
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