fix(h7): improved data cache maintenance (#6310)

radio/src/targets/common/arm/stm32/diskio_sdio.cpp

@@ -345,8 +345,9 @@ static DSTATUS sdio_status(BYTE lun)
 static DRESULT _read_dma(BYTE* buff, DWORD sector, UINT count)
 {
   ReadStatus = 0;
+
 #if __CORTEX_M >= 0x07
-  SCB_CleanInvalidateDCache();
+  SCB_CleanInvalidateDCache_by_Addr(buff, count * 512);
 #endif
 
   if (HAL_SD_ReadBlocks_DMA(&sdio, buff, sector, count) != HAL_OK) {
@@ -358,10 +359,6 @@ static DRESULT _read_dma(BYTE* buff, DWORD sector, UINT count)
   uint32_t timeout = HAL_GetTick();
   while((ReadStatus == 0) && ((HAL_GetTick() - timeout) < SD_TIMEOUT));
 
-#if __CORTEX_M >= 0x07
-  SCB_CleanInvalidateDCache();
-#endif
-
   if (ReadStatus == 0) {
     TRACE("SD read timeout (s:%u c:%u)", sector, (uint32_t)count);
     return RES_ERROR;
@@ -375,8 +372,6 @@ static DRESULT sdio_read(BYTE lun, BYTE * buff, DWORD sector, UINT count)
 {
   DRESULT res = RES_OK;
 
-  // TRACE("disk_read %d %p %10d %d", drv, buff, sector, count);
-
   if (sdio_check_card_state_with_timeout(SD_TIMEOUT) < 0) {
     return RES_ERROR;
   }
@@ -405,7 +400,7 @@ static DRESULT sdio_read(BYTE lun, BYTE * buff, DWORD sector, UINT count)
 static DRESULT _write_dma(const BYTE *buff, DWORD sector, UINT count)
 {
 #if __CORTEX_M >= 0x07
-  SCB_CleanDCache();
+  SCB_CleanDCache_by_Addr((void *)buff, count * 512);
 #endif
 
   WriteStatus = 0;
@@ -431,8 +426,6 @@ static DRESULT sdio_write(BYTE lun, const BYTE *buff, DWORD sector, UINT count)
 {
   DRESULT res = RES_OK;
 
-  // TRACE("disk_write %d %p %10d %d", drv, buff, sector, count);
-
   if (sdio_check_card_state_with_timeout(SD_TIMEOUT) < 0) {
     return RES_ERROR;
   }

radio/src/targets/st16/lcd_driver.cpp

@@ -48,11 +48,16 @@ static void startLcdRefresh(lv_disp_drv_t *disp_drv, uint16_t *buffer,
   (void)disp_drv;
   (void)copy_area;
 
-//  LTDC_Layer1->CFBAR &= ~(LTDC_LxCFBAR_CFBADD);
+  // given the data cache size, this is probably
+  // faster than cleaning by address
+  SCB_CleanDCache();
+
   LTDC_Layer1->CFBAR = (uint32_t)buffer;
+
   // reload shadow registers on vertical blank
   _frame_addr_reloaded = 0;
   LTDC->SRCR = LTDC_SRCR_VBR;
+
   __HAL_LTDC_ENABLE_IT(&hltdc, LTDC_IT_LI);
 
   // wait for reload