From 9581329eff9db72ab4fbb46a594fd7fdda3c51b0 Mon Sep 17 00:00:00 2001
From: Eugen Hristev <eugen.hristev@microchip.com>
Date: Tue, 27 Feb 2018 12:25:07 +0200
Subject: [PATCH] spi: atmel: init FIFOs before spi enable
Git-commit: 9581329eff9db72ab4fbb46a594fd7fdda3c51b0
Patch-mainline: v4.17-rc1
References: bsc#1051510

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@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 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
@@ -1490,6 +1490,11 @@ 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));
@@ -1500,9 +1505,6 @@ 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)