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 <marex@denx.de>

diff --git a/arch/arm/mach-socfpga/clock_manager.c b/arch/arm/mach-socfpga/clock_manager.c
index 1341df4..aa71636 100644 (file)
--- 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 */