have p4 dma somewhat working but having issue with buffer that does not occupy the whole cache line

src/device/dcd.h

@@ -93,15 +93,15 @@ typedef struct TU_ATTR_ALIGNED(4) {
 
 // clean/flush data cache: write cache -> memory.
 // Required before an DMA TX transfer to make sure data is in memory
-void dcd_dcache_clean(void const* addr, uint32_t data_size) TU_ATTR_WEAK;
+void dcd_dcache_clean(const void* addr, uint32_t data_size);
 
 // invalidate data cache: mark cache as invalid, next read will read from memory
 // Required BOTH before and after an DMA RX transfer
-void dcd_dcache_invalidate(void const* addr, uint32_t data_size) TU_ATTR_WEAK;
+void dcd_dcache_invalidate(const void* addr, uint32_t data_size);
 
 // clean and invalidate data cache
 // Required before an DMA transfer where memory is both read/write by DMA
-void dcd_dcache_clean_invalidate(void const* addr, uint32_t data_size) TU_ATTR_WEAK;
+void dcd_dcache_clean_invalidate(const void* addr, uint32_t data_size);
 
 //--------------------------------------------------------------------+
 // Controller API

src/device/usbd.c

@@ -46,9 +46,7 @@
 // Weak stubs: invoked if no strong implementation is available
 //--------------------------------------------------------------------+
 TU_ATTR_WEAK void tud_event_hook_cb(uint8_t rhport, uint32_t eventid, bool in_isr) {
-  (void) rhport;
-  (void) eventid;
-  (void) in_isr;
+  (void) rhport; (void) eventid; (void) in_isr;
 }
 
 TU_ATTR_WEAK void tud_sof_cb(uint32_t frame_count) {
@@ -82,9 +80,7 @@ TU_ATTR_WEAK void tud_resume_cb(void) {
 }
 
 TU_ATTR_WEAK bool tud_vendor_control_xfer_cb(uint8_t rhport, uint8_t stage, tusb_control_request_t const* request) {
-  (void) rhport;
-  (void) stage;
-  (void) request;
+  (void) rhport; (void) stage; (void) request;
   return false;
 }
 
@@ -101,6 +97,18 @@ TU_ATTR_WEAK void dcd_disconnect(uint8_t rhport) {
   (void) rhport;
 }
 
+TU_ATTR_WEAK void dcd_dcache_clean(const void* addr, uint32_t data_size) {
+  (void) addr; (void) data_size;
+}
+
+TU_ATTR_WEAK void dcd_dcache_invalidate(const void* addr, uint32_t data_size) {
+  (void) addr; (void) data_size;
+}
+
+TU_ATTR_WEAK void dcd_dcache_clean_invalidate(const void* addr, uint32_t data_size) {
+  (void) addr; (void) data_size;
+}
+
 //--------------------------------------------------------------------+
 // Device Data
 //--------------------------------------------------------------------+