1 files changed, 14 insertions, 4 deletions

diff --git a/drivers/spi/spi-bitbang-txrx.h b/drivers/spi/spi-bitbang-txrx.h
index c616e41521be..06b34e5bcfa3 100644
--- a/drivers/spi/spi-bitbang-txrx.h
+++ b/drivers/spi/spi-bitbang-txrx.h
@@ -49,12 +49,17 @@ bitbang_txrx_be_cpha0(struct spi_device *spi,
 {
         /* if (cpol == 0) this is SPI_MODE_0; else this is SPI_MODE_2 */
 
+        bool oldbit = !(word & 1);
         /* clock starts at inactive polarity */
         for (word <<= (32 - bits); likely(bits); bits--) {
 
                 /* setup MSB (to slave) on trailing edge */
-                if ((flags & SPI_MASTER_NO_TX) == 0)
-                        setmosi(spi, word & (1 << 31));
+                if ((flags & SPI_MASTER_NO_TX) == 0) {
+                        if ((word & (1 << 31)) != oldbit) {
+                                setmosi(spi, word & (1 << 31));
+                                oldbit = word & (1 << 31);
+                        }
+                }
                 spidelay(nsecs);        /* T(setup) */
 
                 setsck(spi, !cpol);
@@ -76,13 +81,18 @@ bitbang_txrx_be_cpha1(struct spi_device *spi,
 {
         /* if (cpol == 0) this is SPI_MODE_1; else this is SPI_MODE_3 */
 
+        bool oldbit = !(word & (1 << 31));
         /* clock starts at inactive polarity */
         for (word <<= (32 - bits); likely(bits); bits--) {
 
                 /* setup MSB (to slave) on leading edge */
                 setsck(spi, !cpol);
-                if ((flags & SPI_MASTER_NO_TX) == 0)
-                        setmosi(spi, word & (1 << 31));
+                if ((flags & SPI_MASTER_NO_TX) == 0) {
+                        if ((word & (1 << 31)) != oldbit) {
+                                setmosi(spi, word & (1 << 31));
+                                oldbit = word & (1 << 31);
+                        }
+                }
                 spidelay(nsecs); /* T(setup) */
 
                 setsck(spi, cpol);