From 24c92f975cb212547c473d544cc93ec189238241 Mon Sep 17 00:00:00 2001 From: Romain Izard Date: Mon, 11 Dec 2017 17:55:33 +0100 Subject: [PATCH] clk: at91: pmc: Wait for clocks when resuming [ Upstream commit 960e1c4d93be86d3b118fe22d4edc69e401b28b5 ] 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 Acked-by: Ludovic Desroches Acked-by: Nicolas Ferre Acked-by: Alexandre Belloni Signed-off-by: Stephen Boyd Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/clk/at91/pmc.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c index 775af47..5c2b26d 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 = { -- 2.7.4