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From 3a70dd2d050331ee4cf5ad9d5c0a32d83ead9a43 Mon Sep 17 00:00:00 2001
From: Peter Hess <peter.hess@ph-home.de>
Date: Tue, 6 Jul 2021 14:16:09 +0200
Subject: spi: mediatek: fix fifo rx mode
In FIFO mode were two problems:
- RX mode was never handled and
- in this case the tx_buf pointer was NULL and caused an exception
fix this by handling RX mode in mtk_spi_fifo_transfer
Fixes: a568231f4632 ("spi: mediatek: Add spi bus for Mediatek MT8173")
Signed-off-by: Peter Hess <peter.hess@ph-home.de>
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Link: https://lore.kernel.org/r/20210706121609.680534-1-linux@fw-web.de
Signed-off-by: Mark Brown <broonie@kernel.org>
---
drivers/spi/spi-mt65xx.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -434,13 +434,23 @@ static int mtk_spi_fifo_transfer(struct
mtk_spi_setup_packet(master);
cnt = xfer->len / 4;
- iowrite32_rep(mdata->base + SPI_TX_DATA_REG, xfer->tx_buf, cnt);
+ if (xfer->tx_buf)
+ iowrite32_rep(mdata->base + SPI_TX_DATA_REG, xfer->tx_buf, cnt);
+
+ if (xfer->rx_buf)
+ ioread32_rep(mdata->base + SPI_RX_DATA_REG, xfer->rx_buf, cnt);
remainder = xfer->len % 4;
if (remainder > 0) {
reg_val = 0;
- memcpy(®_val, xfer->tx_buf + (cnt * 4), remainder);
- writel(reg_val, mdata->base + SPI_TX_DATA_REG);
+ if (xfer->tx_buf) {
+ memcpy(®_val, xfer->tx_buf + (cnt * 4), remainder);
+ writel(reg_val, mdata->base + SPI_TX_DATA_REG);
+ }
+ if (xfer->rx_buf) {
+ reg_val = readl(mdata->base + SPI_RX_DATA_REG);
+ memcpy(xfer->rx_buf + (cnt * 4), ®_val, remainder);
+ }
}
mtk_spi_enable_transfer(master);
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