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fix(midi2): fix discovery response racing

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Signed-off-by: HiFiPhile <admin@hifiphile.com>
This commit is contained in:
HiFiPhile
2026-08-15 05:11:55 +02:00
parent 0504faf298
commit dfd197ff0c
1 changed files with 79 additions and 18 deletions
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97
src/class/midi/midi2_device.c
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@ -112,7 +112,10 @@ typedef struct {
uint8_t nego_pending_fb_filter;
uint8_t nego_pending_fb_num; // block requested by the pending discovery, 0xFF = all
uint8_t nego_pending_fb_next; // next block index to reply for
bool nego_pending_fb_restart; // restart after the active FB name when requests merge
uint16_t nego_text_status; // text reply owning nego_text_offset, 0 = none
uint16_t nego_text_offset; // progress into the text reply being sent
uint8_t nego_text_index; // Function Block index for an active FB name
/*------------- From this point, data is not cleared by bus reset -------------*/
struct {
@ -444,29 +447,85 @@ static void _nego_send_fb_info(midi2d_interface_t* p_midi, uint8_t fb_idx) {
_nego_send_ump(p_midi, msg, 4);
}
static void _nego_clear_pending(midi2d_interface_t* p_midi) {
p_midi->nego_pending_ep_filter = 0;
p_midi->nego_pending_fb_filter = 0;
p_midi->nego_pending_fb_num = 0;
p_midi->nego_pending_fb_next = 0;
p_midi->nego_pending_fb_restart = false;
p_midi->nego_text_status = 0;
p_midi->nego_text_offset = 0;
p_midi->nego_text_index = 0;
}
static const char* _nego_text_cb(midi2d_interface_t* p_midi, uint16_t status, uint8_t index) {
const uint8_t itf = _itf_idx(p_midi);
switch (status) {
case STREAM_EP_NAME: return tud_midi2_ep_name_cb(itf);
case STREAM_PROD_INSTANCE_ID: return tud_midi2_product_id_cb(itf);
case STREAM_FB_NAME: return tud_midi2_fb_name_cb(itf, index);
default: return NULL;
}
}
// Send or resume one text reply. While it is incomplete, its status and index
// identify the sole owner of nego_text_offset so another discovery request
// cannot resume a different string from the same offset.
static bool _nego_send_text(midi2d_interface_t* p_midi, uint16_t status, uint8_t index) {
const char* text = _nego_text_cb(p_midi, status, index);
const uint16_t len = text ? (uint16_t) strlen(text) : 0;
p_midi->nego_text_status = status;
p_midi->nego_text_index = index;
p_midi->nego_text_offset = _nego_send_stream_text(p_midi, status, status == STREAM_FB_NAME,
index, text, p_midi->nego_text_offset);
if (p_midi->nego_text_offset < len) return false;
p_midi->nego_text_status = 0;
p_midi->nego_text_offset = 0;
p_midi->nego_text_index = 0;
return true;
}
// Send pending discovery replies, one whole reply at a time and only when the
// TX FIFO can take it. A full-filter Endpoint Discovery asks for more bytes
// than the default FIFO holds; replies that do not fit stay pending and are
// retried from the TX complete path, paced by the transfer flow.
static void _nego_send_pending(midi2d_interface_t* p_midi) {
tu_fifo_t* tx_ff = &p_midi->ep_stream.tx.ff;
const uint8_t itf = _itf_idx(p_midi);
// An incomplete text sequence must finish before any newly arrived request
// is serviced; otherwise its Continue/End packets could be attached to a
// different Endpoint or Function Block string.
if (p_midi->nego_text_status) {
const uint16_t status = p_midi->nego_text_status;
const uint8_t index = p_midi->nego_text_index;
if (!_nego_send_text(p_midi, status, index)) return;
if (status == STREAM_FB_NAME) {
if (p_midi->nego_pending_fb_restart) {
p_midi->nego_pending_fb_next = 0;
p_midi->nego_pending_fb_restart = false;
} else {
p_midi->nego_pending_fb_next++;
}
} else {
const uint8_t bit = (status == STREAM_EP_NAME) ? 0x04 : 0x08;
p_midi->nego_pending_ep_filter &= (uint8_t) ~bit;
}
}
while (p_midi->nego_pending_ep_filter) {
const uint8_t bit = (uint8_t)(p_midi->nego_pending_ep_filter & (uint8_t)(-p_midi->nego_pending_ep_filter));
const char* text = NULL;
uint16_t status = 0;
switch (bit) {
case 0x04: text = tud_midi2_ep_name_cb(itf); status = STREAM_EP_NAME; break;
case 0x08: text = tud_midi2_product_id_cb(itf); status = STREAM_PROD_INSTANCE_ID; break;
case 0x04: status = STREAM_EP_NAME; break;
case 0x08: status = STREAM_PROD_INSTANCE_ID; break;
default: break;
}
if (text != NULL) {
p_midi->nego_text_offset = _nego_send_stream_text(p_midi, status, false, 0, text,
p_midi->nego_text_offset);
if (p_midi->nego_text_offset < (uint16_t) strlen(text)) return; // resume on TX complete
p_midi->nego_text_offset = 0;
if (status != 0) {
if (!_nego_send_text(p_midi, status, 0)) return;
} else {
if (tu_fifo_remaining(tx_ff) < 16) return;
switch (bit) {
@ -491,11 +550,7 @@ static void _nego_send_pending(midi2d_interface_t* p_midi) {
_nego_send_fb_info(p_midi, f);
}
if (p_midi->nego_pending_fb_filter & 0x02) {
const char* name = tud_midi2_fb_name_cb(itf, f);
p_midi->nego_text_offset = _nego_send_stream_text(p_midi, STREAM_FB_NAME, true, f, name,
p_midi->nego_text_offset);
if (name != NULL && p_midi->nego_text_offset < (uint16_t) strlen(name)) return;
p_midi->nego_text_offset = 0;
if (!_nego_send_text(p_midi, STREAM_FB_NAME, f)) return;
}
p_midi->nego_pending_fb_next++;
}
@ -541,16 +596,21 @@ static void _nego_handle_stream_msg(midi2d_interface_t* p_midi, const uint32_t*
case STREAM_FB_DISCOVERY: {
const uint8_t req_num = (uint8_t)((words[0] >> 8) & 0xFF);
const uint8_t req_filter = (uint8_t)(words[0] & 0x03);
// Merge with a pending request: repeating a Function Block Info is allowed
// at any time, losing a requested one is not.
if (p_midi->nego_pending_fb_filter && p_midi->nego_pending_fb_num != req_num) {
p_midi->nego_pending_fb_num = 0xFF;
p_midi->nego_pending_fb_next = 0;
if (req_filter && p_midi->nego_pending_fb_filter) {
if (p_midi->nego_pending_fb_num != req_num) p_midi->nego_pending_fb_num = 0xFF;
if (p_midi->nego_text_status == STREAM_FB_NAME) {
p_midi->nego_pending_fb_restart = true;
} else {
p_midi->nego_pending_fb_next = 0;
}
} else if (!p_midi->nego_pending_fb_filter) {
p_midi->nego_pending_fb_num = req_num;
p_midi->nego_pending_fb_next = 0;
}
p_midi->nego_pending_fb_filter |= (uint8_t)(words[0] & 0x03); // bit 0: FB Info, bit 1: FB Name
p_midi->nego_pending_fb_filter |= req_filter; // bit 0: FB Info, bit 1: FB Name
_nego_send_pending(p_midi);
break;
}
@ -861,6 +921,7 @@ bool midi2d_control_xfer_cb(uint8_t rhport, uint8_t stage, const tusb_control_re
tu_edpt_stream_clear(&p_midi->ep_stream.rx);
tu_fifo_clear(&p_midi->ep_stream.tx.ff);
_nego_clear_pending(p_midi);
if (alt == 1) {
p_midi->negotiated = false;