| Message ID | 20170915140411.31716-2-romain.izard.pro@gmail.com |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | Various patches for SAMA5D2 backup mode | expand |
On Fri, Sep 15, 2017 at 04:04:03PM +0200, Romain Izard wrote: > 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> I faced the same issue because of the use of regmap_read_poll_timeout when timekeeping is not ready. Ludovic > --- > 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 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 = { > -- > 2.11.0 >
On 15/09/2017 at 16:04, Romain Izard wrote: > 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> And here is my: Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> > --- > 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 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 = { >
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 = {
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> --- drivers/clk/at91/pmc.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-)