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| author |   Romain Izard <romain.izard.pro@gmail.com> | 2017-12-11 17:55:33 +0100 |
|---|---|---|
| committer |   Stephen Boyd <sboyd@codeaurora.org> | 2017-12-21 16:34:03 -0800 |
| commit | 960e1c4d93be86d3b118fe22d4edc69e401b28b5 (patch) | |
| tree | 5c6ec5df809fc52f291c93394b8fd899868997ea /drivers/clk/at91 | |
| parent | Linux 4.15-rc1 (diff) | |
| download | linux-dev-960e1c4d93be86d3b118fe22d4edc69e401b28b5.tar.xz linux-dev-960e1c4d93be86d3b118fe22d4edc69e401b28b5.zip | |
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>
Diffstat (limited to 'drivers/clk/at91')
| -rw-r--r-- | drivers/clk/at91/pmc.c | 24 |
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 = { |