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dcd_pic: handle bus resume correctly

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This commit is contained in:
Reimu NotMoe
2024-12-27 00:50:32 +08:00
parent 99e6b32a7d
commit 8907a817a2
1 changed files with 49 additions and 9 deletions
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56
src/portable/microchip/pic/dcd_pic.c
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@@ -741,8 +741,11 @@ void dcd_edpt_clear_stall(uint8_t rhport, uint8_t ep_addr)
//--------------------------------------------------------------------+
void dcd_int_handler(uint8_t rhport)
{
uint32_t is = U1IR;
uint32_t msk = U1IE;
uint32_t is, msk;
// Part 1 - "USB interrupts"
is = U1IR;
msk = U1IE;
U1IR = is & ~msk;
is &= msk;
@@ -761,29 +764,66 @@ void dcd_int_handler(uint8_t rhport)
if (is & _U1IR_IDLEIF_MASK) {
// Note Host usually has extra delay after bus reset (without SOF), which could falsely
// detected as Sleep event. Though usbd has debouncing logic so we are good
/*
* NOTE: Do not clear U1OTGIRbits.ACTVIF here!
* Reason:
* ACTVIF is only generated once an IDLEIF has been generated.
* This is a 1:1 ratio interrupt generation.
* For every IDLEIF, there will be only one ACTVIF regardless of
* the number of subsequent bus transitions.
*
* If the ACTIF is cleared here, a problem could occur when:
* [ IDLE ][bus activity ->
* <--- 3 ms -----> ^
* ^ ACTVIF=1
* IDLEIF=1
* # # # # (#=Program polling flags)
* ^
* This polling loop will see both
* IDLEIF=1 and ACTVIF=1.
* However, the program services IDLEIF first
* because ACTIVIE=0.
* If this routine clears the only ACTIVIF,
* then it can never get out of the suspend
* mode.
*/
U1OTGIESET = _U1OTGIE_ACTVIE_MASK;
U1IR = _U1IR_IDLEIF_MASK;
process_bus_sleep(rhport);
}
if (is & _U1IR_RESUMEIF_MASK) {
U1IR = _U1IR_RESUMEIF_MASK;
process_bus_resume(rhport);
}
if (is & _U1IR_SOFIF_MASK) {
U1IR = _U1IR_SOFIF_MASK;
dcd_event_bus_signal(rhport, DCD_EVENT_SOF, true);
}
if (is & _U1IR_STALLIF_MASK) {
U1IR = _U1IR_STALLIF_MASK;
process_stall(rhport);
U1IR = _U1IR_STALLIF_MASK;
}
if (is & _U1IR_TRNIF_MASK) {
process_tokdne(rhport);
}
// Part 2 - "USB OTG interrupts"
is = U1OTGIR;
msk = U1OTGIE;
U1OTGIR = is & ~msk;
is &= msk;
if (is & _U1OTGIR_ACTVIF_MASK) {
#if TU_PIC_INT_SIZE == 4
U1OTGIECLR = _U1OTGIE_ACTVIE_MASK;
#else
U1OTGIE &= ~_U1OTGIE_ACTVIE_MASK;
#endif
U1OTGIR = _U1OTGIR_ACTVIF_MASK;
process_bus_resume(rhport);
}
intr_clear(rhport);
}