clocksource: dbx500-prcmu: use relaxed readl variant (53028227) · Commits · 戴 / test

Modify clksrc_dbx500_prcmu_read to replace readl() with readl_relaxed(). This speeds up calls to the function by about 40%. Signed-off-by:

drivers/clocksource/clksrc-dbx500-prcmu.c

+4 −5

Original line number	Diff line number	Diff line
		@@ -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 */