Hi Timur,
On 27 February 2016 at 03:27, Timur Tabi <timur@xxxxxxxxxxxxxx> wrote:
> 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.
>
Good point! Thanks for your testing :-)
Will post v14 for this change.
> --
> Qualcomm Innovation Center, Inc.
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora
> Forum, a Linux Foundation collaborative project.
--
Best regards,
Fu Wei
Software Engineer
Red Hat Software (Beijing) Co.,Ltd.Shanghai Branch
Ph: +86 21 61221326(direct)
Ph: +86 186 2020 4684 (mobile)
Room 1512, Regus One Corporate Avenue,Level 15,
One Corporate Avenue,222 Hubin Road,Huangpu District,
Shanghai,China 200021
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