spi/au1550_spi: fix setupxfer not to override cfg with zeros

fix setupxfer() not to override generic configuration of speed_hz
and bits_per_word with zeros

Signed-off-by: Jan Nikitenko <jan.nikitenko@gmail.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/spi/au1550_spi.c b/drivers/spi/au1550_spi.c
index 76cbc1a66598..cfd5ff9508fa 100644
--- a/drivers/spi/au1550_spi.c
+++ b/drivers/spi/au1550_spi.c
@@ -237,8 +237,14 @@ static int au1550_spi_setupxfer(struct spi_device *spi, struct spi_transfer *t)
         unsigned bpw, hz;
         u32 cfg, stat;
 
-        bpw = t ? t->bits_per_word : spi->bits_per_word;
-        hz = t ? t->speed_hz : spi->max_speed_hz;
+        bpw = spi->bits_per_word;
+        hz = spi->max_speed_hz;
+        if (t) {
+                if (t->bits_per_word)
+                        bpw = t->bits_per_word;
+                if (t->speed_hz)
+                        hz = t->speed_hz;
+        }
 
         if (bpw < 4 || bpw > 24) {
                 dev_err(&spi->dev, "setupxfer: invalid bits_per_word=%d\n",