clk: at91: pmc: Wait for clocks when resuming

Wait for the syncronization of all clocks when resuming, not only the
UPLL clock. Do not use regmap_read_poll_timeout, as it will call BUG()
when interrupts are masked, which is the case in here.

Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

1 files changed, 16 insertions, 8 deletions

diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
index 775af473fe11..5c2b26de303e 100644
--- a/drivers/clk/at91/pmc.c
+++ b/drivers/clk/at91/pmc.c
@@ -107,10 +107,20 @@ static int pmc_suspend(void)
         return 0;
 }
 
+static bool pmc_ready(unsigned int mask)
+{
+        unsigned int status;
+
+        regmap_read(pmcreg, AT91_PMC_SR, &status);
+
+        return ((status & mask) == mask) ? 1 : 0;
+}
+
 static void pmc_resume(void)
 {
-        int i, ret = 0;
+        int i;
         u32 tmp;
+        u32 mask = AT91_PMC_MCKRDY | AT91_PMC_LOCKA;
 
         regmap_read(pmcreg, AT91_PMC_MCKR, &tmp);
         if (pmc_cache.mckr != tmp)
@@ -134,13 +144,11 @@ static void pmc_resume(void)
                              AT91_PMC_PCR_CMD);
         }
 
-        if (pmc_cache.uckr & AT91_PMC_UPLLEN) {
-                ret = regmap_read_poll_timeout(pmcreg, AT91_PMC_SR, tmp,
-                                               !(tmp & AT91_PMC_LOCKU),
-                                               10, 5000);
-                if (ret)
-                        pr_crit("USB PLL didn't lock when resuming\n");
-        }
+        if (pmc_cache.uckr & AT91_PMC_UPLLEN)
+                mask |= AT91_PMC_LOCKU;
+
+        while (!pmc_ready(mask))
+                cpu_relax();
 }
 
 static struct syscore_ops pmc_syscore_ops = {