From 7e4d2fa2ed2ddf80121372db0282315dc9850a1b Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Tue, 11 Aug 2015 00:54:12 +0200 Subject: arm: socfpga: Fix delay in clock manager This code claims it needs to wait 7us, yet it uses get_timer() function which operates with millisecond granularity. Use timer_get_us() instead, which operates with microsecond granularity. Signed-off-by: Marek Vasut --- arch/arm/mach-socfpga/clock_manager.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) (limited to 'arch/arm/mach-socfpga') diff --git a/arch/arm/mach-socfpga/clock_manager.c b/arch/arm/mach-socfpga/clock_manager.c index 1341df4361..aa716366ea 100644 --- a/arch/arm/mach-socfpga/clock_manager.c +++ b/arch/arm/mach-socfpga/clock_manager.c @@ -90,7 +90,7 @@ static void cm_write_with_phase(uint32_t value, void cm_basic_init(const struct cm_config * const cfg) { - uint32_t start, timeout; + unsigned long end; /* Start by being paranoid and gate all sw managed clocks */ @@ -159,12 +159,10 @@ void cm_basic_init(const struct cm_config * const cfg) writel(cfg->sdram_vco_base, &clock_manager_base->sdr_pll.vco); /* - * Time starts here - * must wait 7 us from BGPWRDN_SET(0) to VCO_ENABLE_SET(1) + * Time starts here. Must wait 7 us from + * BGPWRDN_SET(0) to VCO_ENABLE_SET(1). */ - start = get_timer(0); - /* timeout in unit of us as CONFIG_SYS_HZ = 1000*1000 */ - timeout = 7; + end = timer_get_us() + 7; /* main mpu */ writel(cfg->mpuclk, &clock_manager_base->main_pll.mpuclk); @@ -204,7 +202,7 @@ void cm_basic_init(const struct cm_config * const cfg) writel(cfg->s2fuser1clk, &clock_manager_base->per_pll.s2fuser1clk); /* 7 us must have elapsed before we can enable the VCO */ - while (get_timer(start) < timeout) + while (timer_get_us() < end) ; /* Enable vco */ -- cgit v1.2.1