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authorRabin Vincent <rabin.vincent@stericsson.com>2013-01-21 16:09:31 +0400
committerLinus Walleij <linus.walleij@linaro.org>2013-05-27 16:05:54 +0400
commit530282278bc8ceca122f75c2f1c7f77f28aecc89 (patch)
tree0edbb9fe4b1a3d0559b3cbe0270924913c28c9df /drivers/clocksource/clksrc-dbx500-prcmu.c
parente4aa937ec75df0eea0bee03bffa3303ad36c986b (diff)
downloadlinux-530282278bc8ceca122f75c2f1c7f77f28aecc89.tar.xz
clocksource: dbx500-prcmu: use relaxed readl variant
Modify clksrc_dbx500_prcmu_read to replace readl() with readl_relaxed(). This speeds up calls to the function by about 40%. Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/clocksource/clksrc-dbx500-prcmu.c')
-rw-r--r--drivers/clocksource/clksrc-dbx500-prcmu.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/clocksource/clksrc-dbx500-prcmu.c b/drivers/clocksource/clksrc-dbx500-prcmu.c
index 54f3d119d99c..138c5a579550 100644
--- a/drivers/clocksource/clksrc-dbx500-prcmu.c
+++ b/drivers/clocksource/clksrc-dbx500-prcmu.c
@@ -30,15 +30,14 @@
static void __iomem *clksrc_dbx500_timer_base;
-static cycle_t clksrc_dbx500_prcmu_read(struct clocksource *cs)
+static cycle_t notrace clksrc_dbx500_prcmu_read(struct clocksource *cs)
{
+ void __iomem *base = clksrc_dbx500_timer_base;
u32 count, count2;
do {
- count = readl(clksrc_dbx500_timer_base +
- PRCMU_TIMER_DOWNCOUNT);
- count2 = readl(clksrc_dbx500_timer_base +
- PRCMU_TIMER_DOWNCOUNT);
+ count = readl_relaxed(base + PRCMU_TIMER_DOWNCOUNT);
+ count2 = readl_relaxed(base + PRCMU_TIMER_DOWNCOUNT);
} while (count2 != count);
/* Negate because the timer is a decrementing counter */