fu.wei@linaro.org wrote:
- if (action) {
irq = platform_get_irq(pdev, 0);if (irq < 0) {action = 0;dev_warn(dev, "unable to get ws0 interrupt.\n");} else {if (devm_request_irq(dev, irq, sbsa_gwdt_interrupt, 0,pdev->name, gwdt)) {action = 0;dev_warn(dev, "unable to request IRQ %d.\n",irq);}}if (!action)dev_warn(dev, "falling back to signle stage mode.\n");- }
- /*
* Get the frequency of system counter from the cp15 interface of ARM* Generic timer. We don't need to check it, because if it returns "0",* system would panic in very early stage.*/- gwdt->clk = arch_timer_get_cntfrq();
- gwdt->refresh_base = rf_base;
- gwdt->control_base = cf_base;
I think you need to ping the watchdog before enabling the interrupt, in case there is a pending interrupt. This just happened to me in testing, so I recommend this:
/* * Get the frequency of system counter from the cp15 interface of ARM * Generic timer. We don't need to check it, because if it returns "0", * system would panic in very early stage. */ gwdt->clk = arch_timer_get_cntfrq(); gwdt->refresh_base = rf_base; gwdt->control_base = cf_base;
if (action) { irq = platform_get_irq(pdev, 0); if (irq < 0) { action = 0; dev_warn(dev, "unable to get ws0 interrupt.\n"); } else { sbsa_gwdt_keepalive(&gwdt->wdd); if (devm_request_irq(dev, irq, sbsa_gwdt_interrupt, 0, pdev->name, gwdt)) { action = 0; dev_warn(dev, "unable to request IRQ %d.\n", irq); } } if (!action) dev_warn(dev, "falling back to single stage mode.\n"); }
In fact, I think you need to move the "if (action) {" block near the end of sbsa_gwdt_probe(). We don't want to enable the interrupt until the watchdog is fully initialized.