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spi: spi-imx: fix off-by-one in mx51 CPU mode burst length
c712c05e46
("spi: imx: fix the burst length at DMA mode and CPU mode") corrects three cases of setting the ECSPI burst length but erroneously leaves the in-range CPU case one bit to big (in that field a value of 0 means 1 bit). The effect was that transmissions that should have been 8-bit bytes appeared as 9-bit causing failed communication with SPI devices. Link: https://lore.kernel.org/all/20240201105451.507005-1-carlos.song@nxp.com/ Link: https://lore.kernel.org/all/20240204091912.36488-1-carlos.song@nxp.com/ Fixes:c712c05e46
("spi: imx: fix the burst length at DMA mode and CPU mode") Signed-off-by: Adam Butcher <adam@jessamine.co.uk> Link: https://msgid.link/r/20240318175119.3334-1-adam@jessamine.co.uk Signed-off-by: Mark Brown <broonie@kernel.org>
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1 changed files with 2 additions and 2 deletions
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@ -668,8 +668,8 @@ static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx,
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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 / DIV_ROUND_UP(spi_imx->bits_per_word,
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BITS_PER_BYTE) * spi_imx->bits_per_word
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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 - 1)
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<< MX51_ECSPI_CTRL_BL_OFFSET;
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}
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}
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