spi: au1550: t->{tx,rx}_dma checks

There are no more peripheral drivers that set t->tx_dma or t->rx_dma so
these will always == 0. Therefore, we can remove these checks since
they are always true.
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://msgid.link/r/20240328-spi-more-tx-rx-buf-cleanup-v1-1-9ec1ceedf08c@baylibre.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-au1550.c

@@ -314,11 +314,8 @@ static int au1550_spi_dma_txrxb(struct spi_device *spi, struct spi_transfer *t)
 
 	hw->tx = t->tx_buf;
 	hw->rx = t->rx_buf;
-	dma_tx_addr = t->tx_dma;
-	dma_rx_addr = t->rx_dma;
 
 	/*
-	 * check if buffers are already dma mapped, map them otherwise:
 	 * - first map the TX buffer, so cache data gets written to memory
 	 * - then map the RX buffer, so that cache entries (with
 	 *   soon-to-be-stale data) get removed
@@ -326,23 +323,17 @@ static int au1550_spi_dma_txrxb(struct spi_device *spi, struct spi_transfer *t)
 	 * use temp rx buffer (preallocated or realloc to fit) for rx dma
 	 */
 	if (t->tx_buf) {
-		if (t->tx_dma == 0) {	/* if DMA_ADDR_INVALID, map it */
-			dma_tx_addr = dma_map_single(hw->dev,
-					(void *)t->tx_buf,
+		dma_tx_addr = dma_map_single(hw->dev, (void *)t->tx_buf,
 					     t->len, DMA_TO_DEVICE);
 		if (dma_mapping_error(hw->dev, dma_tx_addr))
 			dev_err(hw->dev, "tx dma map error\n");
 	}
-	}
 
 	if (t->rx_buf) {
-		if (t->rx_dma == 0) {	/* if DMA_ADDR_INVALID, map it */
-			dma_rx_addr = dma_map_single(hw->dev,
-					(void *)t->rx_buf,
+		dma_rx_addr = dma_map_single(hw->dev, (void *)t->rx_buf,
 					     t->len, DMA_FROM_DEVICE);
 		if (dma_mapping_error(hw->dev, dma_rx_addr))
 			dev_err(hw->dev, "rx dma map error\n");
-		}
 	} else {
 		if (t->len > hw->dma_rx_tmpbuf_size) {
 			int ret;
@@ -398,10 +389,10 @@ static int au1550_spi_dma_txrxb(struct spi_device *spi, struct spi_transfer *t)
 			DMA_FROM_DEVICE);
 	}
 	/* unmap buffers if mapped above */
-	if (t->rx_buf && t->rx_dma == 0)
+	if (t->rx_buf)
 		dma_unmap_single(hw->dev, dma_rx_addr, t->len,
 			DMA_FROM_DEVICE);
-	if (t->tx_buf && t->tx_dma == 0)
+	if (t->tx_buf)
 		dma_unmap_single(hw->dev, dma_tx_addr, t->len,
 			DMA_TO_DEVICE);