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From:   Jon Lin <jon.lin@rock-chips.com>
To:     broonie@kernel.org
Cc:     jon.lin@rock-chips.com, heiko@sntech.de, robh+dt@kernel.org,
        linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org,
        devicetree@vger.kernel.org
Subject: [PATCH v6 3/6] spi: rockchip: Set rx_fifo interrupt waterline base on transfer item
Date:   Mon,  7 Jun 2021 19:18:34 +0800
Message-Id: <20210607111837.31074-4-jon.lin@rock-chips.com>
In-Reply-To: <20210607111837.31074-1-jon.lin@rock-chips.com>
References: <20210607111837.31074-1-jon.lin@rock-chips.com>
Precedence: bulk

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@rock-chips.com>
---

Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3: None

 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 bbeed3ae4ee1..0887b19ef3ad 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