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authorPeter Hess <peter.hess@ph-home.de>2021-07-06 15:16:09 +0300
committerMark Brown <broonie@kernel.org>2021-07-12 01:44:40 +0300
commit3a70dd2d050331ee4cf5ad9d5c0a32d83ead9a43 (patch)
treebba5ea41919e4d9e327213fabaa1eae696a17e21 /drivers/spi
parent69e1818ad27bae167eeaaf6829d4a08900ef5153 (diff)
downloadlinux-3a70dd2d050331ee4cf5ad9d5c0a32d83ead9a43.tar.xz
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>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-mt65xx.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
index 976f73b9e299..8d5fa7f1e506 100644
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -427,13 +427,23 @@ static int mtk_spi_fifo_transfer(struct spi_master *master,
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(&reg_val, xfer->tx_buf + (cnt * 4), remainder);
- writel(reg_val, mdata->base + SPI_TX_DATA_REG);
+ if (xfer->tx_buf) {
+ memcpy(&reg_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), &reg_val, remainder);
+ }
}
mtk_spi_enable_transfer(master);