Make fsdev errata delay helper static inline

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Co-authored-by: HiFiPhile <4375114+HiFiPhile@users.noreply.github.com>

Author: Copilot

src/portable/st/stm32_fsdev/fsdev_common.c

@@ -113,21 +113,4 @@ void btable_set_rx_bufsize(uint32_t ep_id, uint8_t buf_id, uint16_t wCount) {
 #endif
 }
 
-/* STM32 FSDEV PMA Buffer Description Table errata workaround:
- * - ES0561 (STM32H503), ES0587 (STM32U535/U545)
- * - CTR may trigger before final PMA SRAM accesses complete on OUT transfers.
- * - Insert delay before reading PMA count/data.
- */
-void fsdev_btable_workaround_delay(bool low_speed) {
-#if defined(TUP_USBIP_FSDEV_STM32) && defined(CFG_TUSB_FSDEV_32BIT)
-  uint32_t cycle_count = low_speed ? CFG_TUSB_FSDEV_BTABLE_LS_DELAY_COUNT : CFG_TUSB_FSDEV_BTABLE_FS_DELAY_COUNT;
-  volatile uint32_t delay_count = cycle_count;
-  while (delay_count > 0U) {
-    delay_count--;
-  }
-#else
-  (void) low_speed;
-#endif
-}
-
 #endif

src/portable/st/stm32_fsdev/fsdev_common.h

@@ -469,7 +469,17 @@ void btable_set_rx_bufsize(uint32_t ep_id, uint8_t buf_id, uint16_t wCount);
 
 // Delay helper for STM32 FSDEV PMA Buffer Description Table errata (ES0561/ES0587).
 // Low-speed path uses CFG_TUSB_FSDEV_BTABLE_LS_DELAY_COUNT, otherwise full-speed count.
-void fsdev_btable_workaround_delay(bool low_speed);
+TU_ATTR_ALWAYS_INLINE static inline void fsdev_btable_workaround_delay(bool low_speed) {
+#if defined(TUP_USBIP_FSDEV_STM32) && defined(CFG_TUSB_FSDEV_32BIT)
+  uint32_t cycle_count = low_speed ? CFG_TUSB_FSDEV_BTABLE_LS_DELAY_COUNT : CFG_TUSB_FSDEV_BTABLE_FS_DELAY_COUNT;
+  volatile uint32_t delay_count = cycle_count;
+  while (delay_count > 0U) {
+    delay_count--;
+  }
+#else
+  (void) low_speed;
+#endif
+}
 
 #ifdef __cplusplus
 }