[PATCH 3/5] mtd: spi: renesas: Configure DRDRENR register

[Marek Vasut]

Make sure DRDRENR register is configured before performing external
address space read. This register might have been configured by a
prior stage bootloader and leaving it unconfigured would interfere
with U-Boot operation. Since U-Boot RPC SPI driver does not support
DDR data transfer mode yet, set this register unconditionally to 0.

Signed-off-by: Marek Vasut <marek.vasut+renesas at mailbox.org>
---
Cc: "Cédric Le Goater" <clg at kaod.org>
Cc: Hai Pham <hai.pham.ud at renesas.com>
Cc: Jagan Teki <jagan at amarulasolutions.com>
Cc: Nobuhiro Iwamatsu <iwamatsu at nigauri.org>
Cc: Paul Barker <paul.barker.ct at bp.renesas.com>
Cc: Tom Rini <trini at konsulko.com>
Cc: William Zhang <william.zhang at broadcom.com>
Cc: u-boot at lists.denx.de
---
 drivers/spi/renesas_rpc_spi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/spi/renesas_rpc_spi.c b/drivers/spi/renesas_rpc_spi.c
index a2ac5525b90..50890981149 100644
--- a/drivers/spi/renesas_rpc_spi.c
+++ b/drivers/spi/renesas_rpc_spi.c
@@ -294,6 +294,7 @@ static int rpc_spi_mem_exec_op(struct spi_slave *spi,
 
 		writel(8 * op->dummy.nbytes - 1, priv->regs + RPC_DRDMCR);
 		writel(0, priv->regs + RPC_DROPR);
+		writel(0, priv->regs + RPC_DRDRENR);
 		writel(smenr, priv->regs + RPC_DRENR);
 
 		memcpy_fromio(din, (void *)(priv->extr + offset), op->data.nbytes);
-- 
2.45.2