[PATCH v4 01/13] spi: dw: Fix driving MOSI low while recieving

[Sean Anderson]

The resting state of MOSI is high when nothing is driving it. If we drive
it low while recieving, it looks like we are transmitting 0x00 instead of
transmitting nothing. This can confuse slaves (like SD cards) which allow
new commands to be sent over MOSI while they are returning data over MISO.
The return of MOSI from 0 to 1 at the end of recieving a byte can look like
a start bit and a transmission bit to an SD card. This will cause the card
to become out-of-sync with the SPI device, as it thinks the device has
already started transmitting two bytes of a new command. The mmc-spi driver
will not detect the R1 response from the SD card, since it is sent too
early, and offset by two bits. This patch fixes transfer errors when using
SD cards with dw spi.

Signed-off-by: Sean Anderson <seanga2 at gmail.com>
---

Changes in v4:
- New

 drivers/spi/designware_spi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/designware_spi.c b/drivers/spi/designware_spi.c
index 2559aac2e9..74372171aa 100644
--- a/drivers/spi/designware_spi.c
+++ b/drivers/spi/designware_spi.c
@@ -322,7 +322,7 @@ static inline u32 rx_max(struct dw_spi_priv *priv)
 static void dw_writer(struct dw_spi_priv *priv)
 {
 	u32 max = tx_max(priv);
-	u16 txw = 0;
+	u16 txw = 0xFFFF;
 
 	while (max--) {
 		/* Set the tx word if the transfer's original "tx" is not null */
-- 
2.28.0