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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>
This commit is contained in:
Rabin Vincent 2013-01-21 13:09:31 +01:00 committed by Linus Walleij
parent e4aa937ec7
commit 530282278b
1 changed files with 4 additions and 5 deletions
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9
drivers/clocksource/clksrc-dbx500-prcmu.c
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@ -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 */