linux-kernel - [PATCH 4/4] spi: spi-zynqmp-gqspi: fix incorrect operating mode in zynqmp_qspi_read

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Message-Id: <20210408040223.23134-5-quanyang.wang@windriver.com>
Date:   Thu,  8 Apr 2021 12:02:23 +0800
From:   quanyang.wang@...driver.com
To:     Mark Brown <broonie@...nel.org>,
        Michal Simek <michal.simek@...inx.com>,
        Amit Kumar Mahapatra <amit.kumar-mahapatra@...inx.com>
Cc:     linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Quanyang Wang <quanyang.wang@...driver.com>
Subject: [PATCH 4/4] spi: spi-zynqmp-gqspi: fix incorrect operating mode in zynqmp_qspi_read_op

From: Quanyang Wang <quanyang.wang@...driver.com>

When starting a read operation, we should call zynqmp_qspi_setuprxdma
first to set xqspi->mode according to xqspi->bytes_to_receive and
to calculate correct xqspi->dma_rx_bytes. Then in the function
zynqmp_qspi_fillgenfifo, generate the appropriate command with
operating mode and bytes to transfer, and fill the GENFIFO with
the command to perform the read operation.

Calling zynqmp_qspi_fillgenfifo before zynqmp_qspi_setuprxdma will
result in incorrect transfer length and operating mode. So change
the calling order to fix this issue.

Fixes: 1c26372e5aa9 ("spi: spi-zynqmp-gqspi: Update driver to use spi-mem framework")
Signed-off-by: Quanyang Wang <quanyang.wang@...driver.com>
Reviewed-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@...inx.com>
---
 drivers/spi/spi-zynqmp-gqspi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
index cf73a069b759..036d8ae41c06 100644
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -827,8 +827,8 @@ static void zynqmp_qspi_write_op(struct zynqmp_qspi *xqspi, u8 tx_nbits,
 static void zynqmp_qspi_read_op(struct zynqmp_qspi *xqspi, u8 rx_nbits,
 				u32 genfifoentry)
 {
-	zynqmp_qspi_fillgenfifo(xqspi, rx_nbits, genfifoentry);
 	zynqmp_qspi_setuprxdma(xqspi);
+	zynqmp_qspi_fillgenfifo(xqspi, rx_nbits, genfifoentry);
 }
 
 /**
-- 
2.25.1