Messages in this thread Patch in this message | | | From | Boris Brezillon <> | Subject | [PATCH 2/5] clk: at91: implement suspend/resume for the PMC irqchip | Date | Mon, 15 Dec 2014 17:15:49 +0100 |
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The irq line used by the PMC block is shared with several peripherals including the init timer which is registering the irq with IRQF_NO_SUSPEND.
To prevent the PMC irq handler from being called while suspended request the irq with the IRQF_SUSPEND_NOACTION flag and implement proper suspend resume functions to save and restore the active PMC IRQs.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> --- drivers/clk/at91/pmc.c | 20 +++++++++++++++++++- drivers/clk/at91/pmc.h | 1 + 2 files changed, 20 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c index 386999b..59753e7 100644 --- a/drivers/clk/at91/pmc.c +++ b/drivers/clk/at91/pmc.c @@ -80,12 +80,29 @@ static int pmc_irq_set_type(struct irq_data *d, unsigned type) return 0; } +static void pmc_irq_suspend(struct irq_data *d) +{ + struct at91_pmc *pmc = irq_data_get_irq_chip_data(d); + + pmc->imr = pmc_read(pmc, AT91_PMC_IMR); + pmc_write(pmc, AT91_PMC_IDR, pmc->imr); +} + +static void pmc_irq_resume(struct irq_data *d) +{ + struct at91_pmc *pmc = irq_data_get_irq_chip_data(d); + + pmc_write(pmc, AT91_PMC_IER, pmc->imr); +} + static struct irq_chip pmc_irq = { .name = "PMC", .irq_disable = pmc_irq_mask, .irq_mask = pmc_irq_mask, .irq_unmask = pmc_irq_unmask, .irq_set_type = pmc_irq_set_type, + .irq_suspend = pmc_irq_suspend, + .irq_resume = pmc_irq_resume, }; static struct lock_class_key pmc_lock_class; @@ -215,7 +232,8 @@ static struct at91_pmc *__init at91_pmc_init(struct device_node *np, goto out_free_pmc; pmc_write(pmc, AT91_PMC_IDR, 0xffffffff); - if (request_irq(pmc->virq, pmc_irq_handler, IRQF_SHARED, "pmc", pmc)) + if (request_irq(pmc->virq, pmc_irq_handler, + IRQF_SHARED | IRQF_SUSPEND_NOACTION, "pmc", pmc)) goto out_remove_irqdomain; return pmc; diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h index 52d2041..69abb08 100644 --- a/drivers/clk/at91/pmc.h +++ b/drivers/clk/at91/pmc.h @@ -33,6 +33,7 @@ struct at91_pmc { spinlock_t lock; const struct at91_pmc_caps *caps; struct irq_domain *irqdomain; + u32 imr; }; static inline void pmc_lock(struct at91_pmc *pmc) -- 1.9.1
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