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spi: imx: fix the burst length at DMA mode and CPU mode
For DMA mode, the bus width of the DMA is equal to the size of data word, so burst length should be configured as bits per word. For CPU mode, because of the spi transfer len is in byte, so calculate the total number of words according to spi transfer len and bits per word, burst length should be configured as total data bits. Signed-off-by: Carlos Song <carlos.song@nxp.com> Reviewed-by: Clark Wang <xiaoning.wang@nxp.com> Fixes:e9b220aeac
("spi: spi-imx: correctly configure burst length when using dma") Fixes:5f66db08cb
("spi: imx: Take in account bits per word instead of assuming 8-bits") Link: https://lore.kernel.org/r/20240204091912.36488-1-carlos.song@nxp.com Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -2,6 +2,7 @@
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// Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
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// Copyright (C) 2008 Juergen Beisert
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#include <linux/bits.h>
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#include <linux/clk.h>
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#include <linux/completion.h>
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#include <linux/delay.h>
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@ -660,15 +661,15 @@ static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx,
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<< MX51_ECSPI_CTRL_BL_OFFSET;
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else {
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if (spi_imx->usedma) {
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ctrl |= (spi_imx->bits_per_word *
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spi_imx_bytes_per_word(spi_imx->bits_per_word) - 1)
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ctrl |= (spi_imx->bits_per_word - 1)
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<< MX51_ECSPI_CTRL_BL_OFFSET;
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} else {
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if (spi_imx->count >= MX51_ECSPI_CTRL_MAX_BURST)
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ctrl |= (MX51_ECSPI_CTRL_MAX_BURST - 1)
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ctrl |= (MX51_ECSPI_CTRL_MAX_BURST * BITS_PER_BYTE - 1)
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<< MX51_ECSPI_CTRL_BL_OFFSET;
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else
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ctrl |= (spi_imx->count * spi_imx->bits_per_word - 1)
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ctrl |= spi_imx->count / DIV_ROUND_UP(spi_imx->bits_per_word,
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BITS_PER_BYTE) * spi_imx->bits_per_word
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<< MX51_ECSPI_CTRL_BL_OFFSET;
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}
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}
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