spi: atmel-quadspi: Fix suspend

At suspend the mx flash tries to disable the octal DTR mode, thus it
issues a ReadID which does not contain any address bytes. mmiocpy is used
and the same bus error is hit.
Unhandled fault: external abort on non-linefetch (0x1008) at 0xe1000000

Use DMA also for ReadID opcode, and avoid mmiocpy.

Fixes: 1fdaf87 ("spi: atmel-quadspi: (workaround) Always use DMA on sama7g5")
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Tested-by: Claudiu Beznea <claudiu.beznea@microchip.com>

Author: ambarus

drivers/spi/atmel-quadspi.c

@@ -888,7 +888,7 @@ static int atmel_qspi_sama7g5_transfer(struct spi_mem *mem,
 
 	/* Send/Receive data. */
 	if (op->data.dir == SPI_MEM_DATA_IN) {
-		if (aq->rx_chan && op->addr.nbytes &&
+		if (aq->rx_chan &&
 		    op->data.nbytes > ATMEL_QSPI_DMA_MIN_BYTES) {
 			ret = atmel_qspi_dma_transfer(mem, op, offset);
 			if (ret)
@@ -906,7 +906,7 @@ static int atmel_qspi_sama7g5_transfer(struct spi_mem *mem,
 				return ret;
 		}
 	} else {
-		if (aq->tx_chan && op->addr.nbytes &&
+		if (aq->tx_chan &&
 		    op->data.nbytes > ATMEL_QSPI_DMA_MIN_BYTES) {
 			ret = atmel_qspi_dma_transfer(mem, op, offset);
 			if (ret)