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wch/usbhs: report resume when the SUSPEND interrupt fires on bus resume #4493

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Merged
HiFiPhile merged 1 commit into from
Nov 12, 2026
Merged

wch/usbhs: report resume when the SUSPEND interrupt fires on bus resume #4493

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6 changes: 5 additions & 1 deletion src/portable/wch/dcd_ch32_usbhs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -473,7 +473,11 @@ void dcd_int_handler(uint8_t rhport) {

USBHSD->INT_FG = USBHS_SETUP_FLAG; /* Clear flag */
} else if (int_flag & USBHS_SUSPEND_FLAG) {
dcd_event_t event = {.rhport = rhport, .event_id = DCD_EVENT_SUSPEND};
// The SUSPEND interrupt fires on both suspend and resume; MIS_ST's suspend bit tells them apart
// (set while suspended, clear once resumed). Reporting both as suspend leaves usbd suspended for
// good: SOF interrupts are off after reset, so nothing else clears it and tud_ready() stays false.
dcd_event_t event = {.rhport = rhport,
.event_id = (USBHSD->MIS_ST & USBHS_SUSPEND) ? DCD_EVENT_SUSPEND : DCD_EVENT_RESUME};
dcd_event_handler(&event, true);

USBHSD->INT_FG = USBHS_SUSPEND_FLAG; /* Clear flag */
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