linux-kernel - [PATCH v2 1/8] spi: rockchip: Set rx_fifo interrupt waterline base on transfer item

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Date:   Tue, 27 Apr 2021 15:37:26 +0800
From:   Jon Lin <jon.lin@...k-chips.com>
To:     broonie@...nel.org
Cc:     heiko@...ech.de, linux-spi@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...il.dk, Jon Lin <jon.lin@...k-chips.com>
Subject: [PATCH v2 1/8] spi: rockchip: Set rx_fifo interrupt waterline base on transfer item

The error here is to calculate the width as 8 bits. In fact, 16 bits
should be considered.

Signed-off-by: Jon Lin <jon.lin@...k-chips.com>
---
 drivers/spi/spi-rockchip.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index 52d6259d96ed..406ea3c6abd9 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -540,8 +540,8 @@ static int rockchip_spi_config(struct rockchip_spi *rs,
 	 * interrupt exactly when the fifo is full doesn't seem to work,
 	 * so we need the strict inequality here
 	 */
-	if (xfer->len < rs->fifo_len)
-		writel_relaxed(xfer->len - 1, rs->regs + ROCKCHIP_SPI_RXFTLR);
+	if ((xfer->len / rs->n_bytes) < rs->fifo_len)
+		writel_relaxed(xfer->len / rs->n_bytes - 1, rs->regs + ROCKCHIP_SPI_RXFTLR);
 	else
 		writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_RXFTLR);
 
-- 
2.17.1