dmaengine: mediatek: Fix APDMA issue when external device resets
Fix how read and write indices are synced and add a new IRQ handler when UART is in DMA-mode.
Signed-off-by: Felix Freimann felix.freimann@mediatek.com Signed-off-by: Vitor Sato Eschholz vsatoes@baylibre.com
Closes MAN-136