diff options
| -rw-r--r-- | target/linux/mediatek/patches-5.10/000-spi-fix-fifo.patch | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/target/linux/mediatek/patches-5.10/000-spi-fix-fifo.patch b/target/linux/mediatek/patches-5.10/000-spi-fix-fifo.patch new file mode 100644 index 0000000000..a7ac93a208 --- /dev/null +++ b/target/linux/mediatek/patches-5.10/000-spi-fix-fifo.patch @@ -0,0 +1,54 @@ +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(-) + +diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c +index 976f73b9e2998..8d5fa7f1e5069 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(®_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); +-- +cgit 1.2.3-1.el7 + |