spi/dw_spi: remove conditional from 'poll_transfer'.

The 'poll_transfer' function employs a conditional to test whether the
transmit buffer is valid; in doing so, on a receive operation no data is
clocked out, thus no data is clocked in and ultimately errors appear.

This removes the conditional as the transmit function will be set to a null
writer when the transmit buffer is invalid, allowing the driver to clock
0x00 out to the device to receive data from the device.

Signed-off-by: George Shore <george@georgeshore.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 2 insertions, 5 deletions

diff --git a/drivers/spi/dw_spi.c b/drivers/spi/dw_spi.c
index d0a080a5b598..3853df5db052 100644
--- a/drivers/spi/dw_spi.c
+++ b/drivers/spi/dw_spi.c
@@ -408,12 +408,9 @@ static irqreturn_t dw_spi_irq(int irq, void *dev_id)
 /* Must be called inside pump_transfers() */
 static void poll_transfer(struct dw_spi *dws)
 {
-        if (dws->tx) {
-                while (dws->write(dws))
-                        dws->read(dws);
-        }
+        while (dws->write(dws))
+                dws->read(dws);
 
-        dws->read(dws);
         transfer_complete(dws);
 }