[linux-yocto] [PATCH 15/29] spi/pxa2xx: Fix BYT ACPI mode SPI DMA transfer failure at low speeds

[rebecca.swee.fun.chang at intel.com]

From: "Chew, Chiau Ee" <chiau.ee.chew at intel.com>

BYT ACPI mode SPI not read/writing correctly at low speeds
using DMA mode. Fix the issue by changing DMA SRC_MSIZE and
DEST_MSIZE of SPI FIFO side from 16 to 32.

Signed-off-by: Chew, Chiau Ee <chiau.ee.chew at intel.com>
Signed-off-by: Maurice Petallo <mauricex.r.petallo at intel.com>
---
 drivers/spi/spi-pxa2xx-dma.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-pxa2xx-dma.c b/drivers/spi/spi-pxa2xx-dma.c
index 3c0b551..79515ed 100644
--- a/drivers/spi/spi-pxa2xx-dma.c
+++ b/drivers/spi/spi-pxa2xx-dma.c
@@ -385,7 +385,7 @@ int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip,
 	 * otherwise we use the default. Also we use the default FIFO
 	 * thresholds for now.
 	 */
-	*burst_code = chip_info ? chip_info->dma_burst_size : 16;
+	*burst_code = chip_info ? chip_info->dma_burst_size : 32;
 	*threshold = SSCR1_RxTresh(RX_THRESH_DFLT)
 		   | SSCR1_TxTresh(TX_THRESH_DFLT);
 
-- 
1.7.10.4