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From:   Leilk Liu <leilk.liu@mediatek.com>
To:     Mark Brown <broonie@kernel.org>
CC:     Mark Rutland <mark.rutland@arm.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-spi@vger.kernel.org>, <linux-mediatek@lists.infradead.org>,
        <xinping.qian@mediatek.com>, Leilk Liu <leilk.liu@mediatek.com>
Subject: [PATCH] spi: mediatek: use correct mata->xfer_len when in fifo transfer
Date:   Wed, 31 Oct 2018 16:49:16 +0800
Message-ID: <1540975756-2021-1-git-send-email-leilk.liu@mediatek.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

when xfer_len is greater than 64 bytes and use fifo mode
to transfer, the actual length from the third time is mata->xfer_len
but not len in mtk_spi_interrupt().

Signed-off-by: Leilk Liu <leilk.liu@mediatek.com>
---
 drivers/spi/spi-mt65xx.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
index 3dc3162..0c2867d 100644
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -522,11 +522,11 @@ static irqreturn_t mtk_spi_interrupt(int irq, void *dev_id)
 		mdata->xfer_len = min(MTK_SPI_MAX_FIFO_SIZE, len);
 		mtk_spi_setup_packet(master);
 
-		cnt = len / 4;
+		cnt = mdata->xfer_len / 4;
 		iowrite32_rep(mdata->base + SPI_TX_DATA_REG,
 				trans->tx_buf + mdata->num_xfered, cnt);
 
-		remainder = len % 4;
+		remainder = mdata->xfer_len % 4;
 		if (remainder > 0) {
 			reg_val = 0;
 			memcpy(&reg_val,
-- 
1.7.9.5