[PATCH 0/2] spi: more tx_buf/rx_buf removal

[PATCH 0/2] spi: more tx_buf/rx_buf removal

[David Lechner]

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/

---
David Lechner (2):
      spi: au1550: t->{tx,rx}_dma checks
      spi: fsl: remove is_dma_mapped checks

 drivers/spi/spi-au1550.c  | 29 ++++++++++-------------------
 drivers/spi/spi-fsl-cpm.c | 14 ++++----------
 drivers/spi/spi-fsl-cpm.h |  5 ++---
 drivers/spi/spi-fsl-spi.c |  7 +++----
 4 files changed, 19 insertions(+), 36 deletions(-)
---
base-commit: d5449432f794e75cd4f5e46bc33bfe6ce20b657d
change-id: 20240328-spi-more-tx-rx-buf-cleanup-8198f2898036

[PATCH 1/2] spi: au1550: t->{tx,rx}_dma checks

[David Lechner]

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>
---
 drivers/spi/spi-au1550.c | 29 ++++++++++-------------------
 1 file changed, 10 insertions(+), 19 deletions(-)

diff --git a/drivers/spi/spi-au1550.c b/drivers/spi/spi-au1550.c
index 825d2f1cdff8..16f200bb3d17 100644
--- a/drivers/spi/spi-au1550.c
+++ b/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,
-					t->len, DMA_TO_DEVICE);
-			if (dma_mapping_error(hw->dev, dma_tx_addr))
-				dev_err(hw->dev, "tx dma map error\n");
-		}
+		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,
-					t->len, DMA_FROM_DEVICE);
-			if (dma_mapping_error(hw->dev, dma_rx_addr))
-				dev_err(hw->dev, "rx dma map error\n");
-		}
+		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);
 

-- 
2.43.2

[PATCH 2/2] spi: fsl: remove is_dma_mapped checks

[David Lechner]

There are no more peripheral drivers that set t->tx_dma or t->rx_dma.
Therefore, is_dma_mapped is always false and can be removed.

Signed-off-by: David Lechner <dlechner@baylibre.com>
---
 drivers/spi/spi-fsl-cpm.c | 14 ++++----------
 drivers/spi/spi-fsl-cpm.h |  5 ++---
 drivers/spi/spi-fsl-spi.c |  7 +++----
 3 files changed, 9 insertions(+), 17 deletions(-)

diff --git a/drivers/spi/spi-fsl-cpm.c b/drivers/spi/spi-fsl-cpm.c
index 47c7a5c6257f..e335132080bf 100644
--- a/drivers/spi/spi-fsl-cpm.c
+++ b/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,
-		     struct spi_transfer *t, bool is_dma_mapped)
+int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t)
 {
 	struct device *dev = mspi->dev;
 	struct fsl_spi_reg __iomem *reg_base = mspi->reg_base;
 
-	if (is_dma_mapped) {
-		mspi->map_tx_dma = 0;
-		mspi->map_rx_dma = 0;
-	} else {
-		mspi->map_tx_dma = 1;
-		mspi->map_rx_dma = 1;
-	}
+	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) {
diff --git a/drivers/spi/spi-fsl-cpm.h b/drivers/spi/spi-fsl-cpm.h
index 160f999708b6..e012abba055f 100644
--- a/drivers/spi/spi-fsl-cpm.h
+++ b/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,
-				   bool is_dma_mapped) { return 0; }
+				   struct spi_transfer *t) { 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; }
diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c
index 97faf984801f..997e07c0a24a 100644
--- a/drivers/spi/spi-fsl-spi.c
+++ b/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,
-			    bool is_dma_mapped)
+static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t)
 {
 	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;
 

-- 
2.43.2

Re: [PATCH 0/2] spi: more tx_buf/rx_buf removal

[Mark Brown]

On Thu, 28 Mar 2024 15:51:44 -0500, David Lechner wrote:
> 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/
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next

Thanks!

[1/2] spi: au1550: t->{tx,rx}_dma checks
      commit: c2064672f13344586234183e276cc4e0f2cfb70a
[2/2] spi: fsl: remove is_dma_mapped checks
      commit: 64fe73d10323e399b2e8eb5407390bcb302a046c

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

Re: [PATCH 0/2] spi: more tx_buf/rx_buf removal

[Andy Shevchenko]

Thu, Mar 28, 2024 at 03:51:44PM -0500, David Lechner kirjoitti:
> 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.

He-he,
84a6be7db9050 ("mmc: mmc_spi: remove custom DMA mapped buffers").

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

-- 
With Best Regards,
Andy Shevchenko