[PATCH 4.19 10/16] Revert "spi: mediatek: fix fifo rx mode"
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2021-08-06 08:18:03
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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> This reverts commit bd0447f72de0963129612bf18202204d5b25e133 which is commit 3a70dd2d050331ee4cf5ad9d5c0a32d83ead9a43 upstream. It has been found to have problems. Reported-by: Guenter Roeck <linux@roeck-us.net> Cc: Peter Hess <redacted> Cc: Frank Wunderlich <redacted> Cc: Mark Brown <broonie@kernel.org> Cc: Sasha Levin <sashal@kernel.org> Link: https://lore.kernel.org/r/efee3a58-a4d2-af22-0931-e81b877ab539@roeck-us.net (local) Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/spi/spi-mt65xx.c | 16 +++------------- 1 file changed, 3 insertions(+), 13 deletions(-)
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c@@ -392,23 +392,13 @@ static int mtk_spi_fifo_transfer(struct mtk_spi_setup_packet(master); cnt = xfer->len / 4; - 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); + iowrite32_rep(mdata->base + SPI_TX_DATA_REG, xfer->tx_buf, cnt); remainder = xfer->len % 4; if (remainder > 0) { reg_val = 0; - 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); - } + memcpy(®_val, xfer->tx_buf + (cnt * 4), remainder); + writel(reg_val, mdata->base + SPI_TX_DATA_REG); } mtk_spi_enable_transfer(master);