Messages in this thread | | | Date | Fri, 12 May 2017 15:36:41 +0200 | From | Alexandre Belloni <> | Subject | Re: [PATCH v3] clk: at91: Add sama5d2 suspend/resume |
| |
Hi,
On 11/05/2017 at 09:17:41 +0200, Nicolas Ferre wrote: > Le 10/05/2017 à 19:09, Alexandre Belloni a écrit : > > On sama5d2, VDD core maybe be cut while in suspend. This means registers > > will be lost. Ensure they are saved and restored properly. > > > > Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> > > Very good, thanks! > > Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> >
I've found some issue with this, I'll send v4 soon.
> > --- > > Changes in v3: > > - use regmap_read_poll_timeout to handle the USB PLL > > - fix typo > > > > > > drivers/clk/at91/pmc.c | 104 +++++++++++++++++++++++++++++++++++++++++++++++++ > > 1 file changed, 104 insertions(+) > > > > diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c > > index 526df5ba042d..7fe1dc8d1829 100644 > > --- a/drivers/clk/at91/pmc.c > > +++ b/drivers/clk/at91/pmc.c > > @@ -13,7 +13,9 @@ > > #include <linux/clk/at91_pmc.h> > > #include <linux/of.h> > > #include <linux/mfd/syscon.h> > > +#include <linux/platform_device.h> > > #include <linux/regmap.h> > > +#include <linux/syscore_ops.h> > > > > #include <asm/proc-fns.h> > > > > @@ -41,3 +43,105 @@ int of_at91_get_clk_range(struct device_node *np, const char *propname, > > return 0; > > } > > EXPORT_SYMBOL_GPL(of_at91_get_clk_range); > > + > > +#ifdef CONFIG_PM > > +static struct regmap *pmcreg; > > + > > +static struct > > +{ > > + u32 scsr; > > + u32 pcsr0; > > + u32 uckr; > > + u32 mor; > > + u32 mcfr; > > + u32 pllar; > > + u32 mckr; > > + u32 usb; > > + u32 imr; > > + u32 pcsr1; > > + u32 pcr[64]; > > +} pmc_cache; > > + > > +static int pmc_suspend(void) > > +{ > > + int i; > > + > > + regmap_read(pmcreg, AT91_PMC_IMR, &pmc_cache.scsr); > > + regmap_read(pmcreg, AT91_PMC_PCSR, &pmc_cache.pcsr0); > > + regmap_read(pmcreg, AT91_CKGR_UCKR, &pmc_cache.uckr); > > + regmap_read(pmcreg, AT91_CKGR_MOR, &pmc_cache.mor); > > + regmap_read(pmcreg, AT91_CKGR_MCFR, &pmc_cache.mcfr); > > + regmap_read(pmcreg, AT91_CKGR_PLLAR, &pmc_cache.pllar); > > + regmap_read(pmcreg, AT91_PMC_MCKR, &pmc_cache.mckr); > > + regmap_read(pmcreg, AT91_PMC_USB, &pmc_cache.usb); > > + regmap_read(pmcreg, AT91_PMC_IMR, &pmc_cache.imr); > > + regmap_read(pmcreg, AT91_PMC_PCSR1, &pmc_cache.pcsr1); > > + > > + for (i = 2; i < 64; i++) { > > + regmap_write(pmcreg, AT91_PMC_PCR, (i & AT91_PMC_PCR_PID_MASK)); > > + regmap_read(pmcreg, AT91_PMC_PCR, &pmc_cache.pcr[i]); > > + } > > + > > + return 0; > > +} > > + > > +static void pmc_resume(void) > > +{ > > + int i, ret = 0; > > + u32 tmp; > > + > > + regmap_read(pmcreg, AT91_PMC_MCKR, &tmp); > > + if (pmc_cache.mckr != tmp) > > + pr_warn("MCKR was not configured properly by the firmware\n"); > > + regmap_read(pmcreg, AT91_CKGR_PLLAR, &tmp); > > + if (pmc_cache.pllar != tmp) > > + pr_warn("PLLAR was not configured properly by the firmware\n"); > > + > > + regmap_write(pmcreg, AT91_PMC_IMR, pmc_cache.scsr); > > + regmap_write(pmcreg, AT91_PMC_PCER, pmc_cache.pcsr0); > > + regmap_write(pmcreg, AT91_CKGR_UCKR, pmc_cache.uckr); > > + regmap_write(pmcreg, AT91_CKGR_MOR, pmc_cache.mor); > > + regmap_write(pmcreg, AT91_CKGR_MCFR, pmc_cache.mcfr); > > + regmap_write(pmcreg, AT91_PMC_USB, pmc_cache.usb); > > + regmap_write(pmcreg, AT91_PMC_IMR, pmc_cache.imr); > > + regmap_write(pmcreg, AT91_PMC_PCER1, pmc_cache.pcsr1); > > + > > + for (i = 2; i < 64; i++) { > > + regmap_write(pmcreg, AT91_PMC_PCR, (i & AT91_PMC_PCR_PID_MASK)); > > + regmap_write(pmcreg, AT91_PMC_PCR, pmc_cache.pcr[i]); > > + } > > + > > + 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"); > > + } > > +} > > + > > +static struct syscore_ops pmc_syscore_ops = { > > + .suspend = pmc_suspend, > > + .resume = pmc_resume, > > +}; > > + > > +static const struct of_device_id sama5d2_pmc_dt_ids[] = { > > + { .compatible = "atmel,sama5d2-pmc" }, > > + { /* sentinel */ } > > +}; > > + > > +static int __init pmc_register_ops(void) > > +{ > > + struct device_node *np; > > + > > + np = of_find_matching_node(NULL, sama5d2_pmc_dt_ids); > > + > > + pmcreg = syscon_node_to_regmap(np); > > + if (IS_ERR(pmcreg)) > > + return PTR_ERR(pmcreg); > > + > > + register_syscore_ops(&pmc_syscore_ops); > > + > > + return 0; > > +} > > +/* This has to happen before arch_initcall because of the tcb_clksrc driver */ > > +postcore_initcall(pmc_register_ops); > > +#endif > > > > > -- > Nicolas Ferre
-- Alexandre Belloni, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
| |