Re: [PATCH v2 2/6] firmware: ti_sci: Partial-IO support

Krzysztof Kozlowski
2024-08-06T06:26:54Z

On 29/07/2024 10:00, Markus Schneider-Pargmann wrote:
> +static int tisci_sys_off_handler(struct sys_off_data *data)
> +{
> + struct ti_sci_info *info = data->cb_data;
> + int i;
> + int ret;
> + bool enter_partial_io = false;
> +
> + for (i = 0; i != info->nr_wakeup_sources; ++i) {
> + struct platform_device *pdev =
> + of_find_device_by_node(info->wakeup_source_nodes[i]);
> +
> + if (!pdev)
> + continue;
> +
> + if (device_may_wakeup(&pdev->dev)) {

...

> + dev_dbg(info->dev, "%pOFp identified as wakeup source\n",
> + info->wakeup_source_nodes[i]);
> + enter_partial_io = true;
> + }
> + }
> +
> + if (!enter_partial_io)
> + return NOTIFY_DONE;
> +
> + ret = tisci_enter_partial_io(info);
> +
> + if (ret) {
> + dev_err(info->dev,
> + "Failed to enter Partial-IO %pe, trying to do an emergency restart\n",
> + ERR_PTR(ret));
> + emergency_restart();
> + }
> +
> + while (1);
> +
> + return NOTIFY_DONE;
> +}
> +
> /* Description for K2G */
> static const struct ti_sci_desc ti_sci_pmmc_k2g_desc = {
> .default_host_id = 2,
> @@ -3398,6 +3485,35 @@ static int ti_sci_probe(struct platform_device *pdev)
> goto out;
> }
>
> + if (of_property_read_bool(dev->of_node, "ti,partial-io-wakeup-sources")) {
> + info->nr_wakeup_sources =
> + of_count_phandle_with_args(dev->of_node,
> + "ti,partial-io-wakeup-sources",
> + NULL);

I don't see the point of this. You have quite a static list of devices -
just look at your DTS. Then you don't even do anything useful with the
phandles you got here.

This property looks entirely useless. I already commented on the binding
(which you did not respond to), so let's comment also here:

No, it duplicates wakeup-source and your code shows that it is not even
needed.

Best regards,
Krzysztof