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hub: always power on

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Matheus
2026-07-29 00:49:18 -03:00
parent 8a72152c21
commit 4176581366
1 changed files with 8 additions and 17 deletions
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kernel-src/io/usb/class/hub.c
+8 -17
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@@ -9,8 +9,7 @@
#define USB_HUB_REQUEST_CLEAR_FEATURE 1
#define USB_HUB_REQUEST_SET_FEATURE 3
#define USB_HUB_POWER_SWITCHING_MODE_MASK 0x0003
#define USB_HUB_POWER_SWITCHING_MODE_NONE (1 << 1)
#define USB_HUB_MIN_POWER_GOOD_US 100000
typedef struct {
uint64_t in_buffer;
@@ -281,8 +280,10 @@ static void power_on_callback(usb_device_t *dev, void *ctx, usb_status_t status,
if (++data->ports_powered == data->usb_hub->port_count) {
usb_hub_desc_t *desc = (usb_hub_desc_t *)dev->hub_desc;
size_t power_good_us = (size_t)desc->bPwrOn2PwrGood * 2000;
if (power_good_us)
sched_sleep_us(power_good_us);
// External hubs need at least 100 ms for port power to stabilize.
if (power_good_us < USB_HUB_MIN_POWER_GOOD_US)
power_good_us = USB_HUB_MIN_POWER_GOOD_US;
sched_sleep_us(power_good_us);
initial_status_scan(dev, data);
} else if (power_port(dev, data->ports_powered, data)) {
printf("hub: power_port() failed\n");
@@ -293,13 +294,6 @@ static int power_port(usb_device_t *dev, int port, hub_driver_data_t *data) {
return hub_port_control_xfer(data->usb_hub->device, USB_HUB_REQUEST_SET_FEATURE, USB_HUB_FEATURE_PORT_POWER, port, NULL, 0, power_on_callback, data);
}
static bool hub_advertises_port_power_switching(usb_device_t *dev) {
usb_hub_desc_t *desc = (usb_hub_desc_t *)dev->hub_desc;
uint16_t power_mode = desc->wHubCharacteristics & USB_HUB_POWER_SWITCHING_MODE_MASK;
return (power_mode & USB_HUB_POWER_SWITCHING_MODE_NONE) == 0;
}
static void get_hub_name(usb_device_t *dev, char *buffer, size_t buffer_size) {
uint8_t major = (dev->desc.bcdUSB >> 8) & 0x0f;
uint8_t minor_tens = (dev->desc.bcdUSB >> 4) & 0x0f;
@@ -386,12 +380,9 @@ static int hub_attach(usb_device_t *dev, usb_interface_t *interface) {
return error;
}
if (hub_advertises_port_power_switching(dev)) {
if (power_port(dev, 0, hub_driver_data))
printf("hub: failed to power first port\n");
} else {
initial_status_scan(dev, hub_driver_data);
}
// Some hubs emulate power switching but still require PORT_POWER requests.
if (power_port(dev, 0, hub_driver_data))
printf("hub: failed to power first port\n");
return 0;
}