diff options
| author | Peter Hess <peter.hess@ph-home.de> | 2021-07-06 14:16:09 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-28 11:12:17 +0200 |
| commit | 5391ab22bead617d00346d86109e19c7a7288b29 (patch) | |
| tree | ddb1fd066c608d5942683177503e53ef934e3e98 /drivers/spi | |
| parent | 85a571cb9d8d385a95c4f1bf35c41b5c0db23304 (diff) | |
| download | linux-rt-5391ab22bead617d00346d86109e19c7a7288b29.tar.gz | |
spi: mediatek: fix fifo rx mode
[ Upstream commit 3a70dd2d050331ee4cf5ad9d5c0a32d83ead9a43 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-mt65xx.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c index da28c52c9da1..e2b171057b3b 100644 --- a/drivers/spi/spi-mt65xx.c +++ b/drivers/spi/spi-mt65xx.c @@ -392,13 +392,23 @@ 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(®_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); |