4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
commit 9581329eff9db72ab4fbb46a594fd7fdda3c51b0 upstream.
The datasheet recommends initializing FIFOs before
SPI enable. If we do not do it like this, there may be
a strange behavior. We noticed that DMA does not work properly
with FIFOs if we do not clear them beforehand or enable them
before SPIEN.
Signed-off-by: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
Acked-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/spi/spi-atmel.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -1489,6 +1489,11 @@ static void atmel_spi_init(struct atmel_
{
spi_writel(as, CR, SPI_BIT(SWRST));
spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */
+
+ /* It is recommended to enable FIFOs first thing after reset */
+ if (as->fifo_size)
+ spi_writel(as, CR, SPI_BIT(FIFOEN));
+
if (as->caps.has_wdrbt) {
spi_writel(as, MR, SPI_BIT(WDRBT) | SPI_BIT(MODFDIS)
| SPI_BIT(MSTR));
@@ -1499,9 +1504,6 @@ static void atmel_spi_init(struct atmel_
if (as->use_pdc)
spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS));
spi_writel(as, CR, SPI_BIT(SPIEN));
-
- if (as->fifo_size)
- spi_writel(as, CR, SPI_BIT(FIFOEN));
}
static int atmel_spi_probe(struct platform_device *pdev)