spi: more tx_buf/rx_buf removal

Merge series from David Lechner <dlechner@baylibre.com>:

I found a couple more controller drivers that were checking if the
tx_buf and rx_buf fields in the spi_transfer structure were set by a
peripheral driver that I missed in [1]. These checks can be removed
as well.

[1]: https://lore.kernel.org/linux-spi/20240325-spi-remove-is_dma_mapped-v2-1-d08d62b61f1c@baylibre.com/

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,
+					     t->len, DMA_TO_DEVICE);
-					(void *)t->tx_buf,
+		if (dma_mapping_error(hw->dev, dma_tx_addr))
-					t->len, DMA_TO_DEVICE);
+			dev_err(hw->dev, "tx dma map error\n");
-			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,
+					     t->len, DMA_FROM_DEVICE);
-					(void *)t->rx_buf,
+		if (dma_mapping_error(hw->dev, dma_rx_addr))
-					t->len, DMA_FROM_DEVICE);
+			dev_err(hw->dev, "rx dma map error\n");
-			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);
 

drivers/spi/spi-fsl-cpm.c

@@ -98,19 +98,13 @@ static void fsl_spi_cpm_bufs_start(struct mpc8xxx_spi *mspi)
 	mpc8xxx_spi_write_reg(&reg_base->command, SPCOM_STR);
 }
 
-int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi,
+int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t)
-		     struct spi_transfer *t, bool is_dma_mapped)
 {
 	struct device *dev = mspi->dev;
 	struct fsl_spi_reg __iomem *reg_base = mspi->reg_base;
 
-	if (is_dma_mapped) {
+	mspi->map_tx_dma = 1;
-		mspi->map_tx_dma = 0;
+	mspi->map_rx_dma = 1;
-		mspi->map_rx_dma = 0;
-	} else {
-		mspi->map_tx_dma = 1;
-		mspi->map_rx_dma = 1;
-	}
 
 	if (!t->tx_buf) {
 		mspi->tx_dma = mspi->dma_dummy_tx;
@@ -147,7 +141,7 @@ int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi,
 			return -ENOMEM;
 		}
 	} else if (t->tx_buf) {
-		mspi->tx_dma = t->tx_dma;
+		mspi->tx_dma = 0;
 	}
 
 	if (mspi->map_rx_dma) {

drivers/spi/spi-fsl-cpm.h

@@ -20,7 +20,7 @@
 #ifdef CONFIG_FSL_SOC
 extern void fsl_spi_cpm_reinit_txrx(struct mpc8xxx_spi *mspi);
 extern int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi,
-			    struct spi_transfer *t, bool is_dma_mapped);
+			    struct spi_transfer *t);
 extern void fsl_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi);
 extern void fsl_spi_cpm_irq(struct mpc8xxx_spi *mspi, u32 events);
 extern int fsl_spi_cpm_init(struct mpc8xxx_spi *mspi);
@@ -28,8 +28,7 @@ extern void fsl_spi_cpm_free(struct mpc8xxx_spi *mspi);
 #else
 static inline void fsl_spi_cpm_reinit_txrx(struct mpc8xxx_spi *mspi) { }
 static inline int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi,
-				   struct spi_transfer *t,
+				   struct spi_transfer *t) { return 0; }
-				   bool is_dma_mapped) { return 0; }
 static inline void fsl_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi) { }
 static inline void fsl_spi_cpm_irq(struct mpc8xxx_spi *mspi, u32 events) { }
 static inline int fsl_spi_cpm_init(struct mpc8xxx_spi *mspi) { return 0; }

drivers/spi/spi-fsl-spi.c

@@ -249,8 +249,7 @@ static int fsl_spi_cpu_bufs(struct mpc8xxx_spi *mspi,
 	return 0;
 }
 
-static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t,
+static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t)
-			    bool is_dma_mapped)
 {
 	struct mpc8xxx_spi *mpc8xxx_spi = spi_controller_get_devdata(spi->controller);
 	struct fsl_spi_reg __iomem *reg_base;
@@ -274,7 +273,7 @@ static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t,
 	reinit_completion(&mpc8xxx_spi->done);
 
 	if (mpc8xxx_spi->flags & SPI_CPM_MODE)
-		ret = fsl_spi_cpm_bufs(mpc8xxx_spi, t, is_dma_mapped);
+		ret = fsl_spi_cpm_bufs(mpc8xxx_spi, t);
 	else
 		ret = fsl_spi_cpu_bufs(mpc8xxx_spi, t, len);
 	if (ret)
@@ -353,7 +352,7 @@ static int fsl_spi_transfer_one(struct spi_controller *controller,
 	if (status < 0)
 		return status;
 	if (t->len)
-		status = fsl_spi_bufs(spi, t, !!t->tx_dma || !!t->rx_dma);
+		status = fsl_spi_bufs(spi, t);
 	if (status > 0)
 		return -EMSGSIZE;