spi: fsl-cpm: Use 16 bit mode for large transfers with even size

(cherry picked from upstream fc96ec826bced75cc6b9c07a4ac44bbf651337ab)

On CPM, the RISC core is a lot more efficiant when doing transfers
in 16-bits chunks than in 8-bits chunks, but unfortunately the
words need to be byte swapped as seen in a previous commit.

So, for large tranfers with an even size, allocate a temporary tx
buffer and byte-swap data before and after transfer.

This change allows setting higher speed for transfer. For instance
on an MPC 8xx (CPM1 comms RISC processor), the documentation tells
that transfer in byte mode at 1 kbit/s uses 0.200% of CPM load
at 25 MHz while a word transfer at the same speed uses 0.032%
of CPM load. This means the speed can be 6 times higher in
word mode for the same CPM load.

For the time being, only do it on CPM1 as there must be a
trade-off between the CPM load reduction and the CPU load required
to byte swap the data.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Link: https://lore.kernel.org/r/f2e981f20f92dd28983c3949702a09248c23845c.1680371809.git.christophe.leroy@csgroup.eu
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/spi/spi-fsl-cpm.c b/drivers/spi/spi-fsl-cpm.c
index ee905880769e6c86362c8bbdd5edcce3c0d324ad..7832ce330b29dc8c12cada4805e07037a5137df9 100644 (file)
--- a/drivers/spi/spi-fsl-cpm.c
+++ b/drivers/spi/spi-fsl-cpm.c
@@ -21,6 +21,7 @@
 #include <linux/spi/spi.h>
 #include <linux/types.h>
 #include <linux/platform_device.h>
+#include <linux/byteorder/generic.h>
 
 #include "spi-fsl-cpm.h"
 #include "spi-fsl-lib.h"
@@ -120,6 +121,21 @@ int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi,
                mspi->rx_dma = mspi->dma_dummy_rx;
                mspi->map_rx_dma = 0;
        }
+       if (t->bits_per_word == 16 && t->tx_buf) {
+               const u16 *src = t->tx_buf;
+               u16 *dst;
+               int i;
+
+               dst = kmalloc(t->len, GFP_KERNEL);
+               if (!dst)
+                       return -ENOMEM;
+
+               for (i = 0; i < t->len >> 1; i++)
+                       dst[i] = cpu_to_le16p(src + i);
+
+               mspi->tx = dst;
+               mspi->map_tx_dma = 1;
+       }
 
        if (mspi->map_tx_dma) {
                void *nonconst_tx = (void *)mspi->tx; /* shut up gcc */
@@ -173,6 +189,13 @@ void fsl_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi)
        if (mspi->map_rx_dma)
                dma_unmap_single(dev, mspi->rx_dma, t->len, DMA_FROM_DEVICE);
        mspi->xfer_in_progress = NULL;
+
+       if (t->bits_per_word == 16 && t->rx_buf) {
+               int i;
+
+               for (i = 0; i < t->len; i += 2)
+                       le16_to_cpus(t->rx_buf + i);
+       }
 }
 EXPORT_SYMBOL_GPL(fsl_spi_cpm_bufs_complete);
 

diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c
index f1d4aa31023373becf099cead765a28c84db700f..63302e21e574caf342485070e70a102ac960fb96 100644 (file)
--- a/drivers/spi/spi-fsl-spi.c
+++ b/drivers/spi/spi-fsl-spi.c
@@ -368,6 +368,9 @@ static int fsl_spi_do_one_msg(struct spi_master *master,
                                return -EINVAL;
                        if (t->bits_per_word == 16 || t->bits_per_word == 32)
                                t->bits_per_word = 8; /* pretend its 8 bits */
+                       if (t->bits_per_word == 8 && t->len >= 256 &&
+                           (mpc8xxx_spi->flags & SPI_CPM1))
+                               t->bits_per_word = 16;
                }
        }