[PATCH 4.19 001/220] spi: mediatek: use correct mata->xfer_len when in fifo transfer

Greg Kroah-Hartman
2019-11-22T10:55:51Z

From: Leilk Liu <leilk.liu@mediatek.com>

commit a4d8f64f7267a88d4688f5c216926f5f6cafbae6 upstream.

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>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/spi/spi-mt65xx.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -522,11 +522,11 @@ static irqreturn_t mtk_spi_interrupt(int
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,