fu.wei@xxxxxxxxxx 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.
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