spi: lpspi: fix dataloss when SS is inactivated between every words

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If we don't use CONT to keep SS activated or use DMA mode without
cs-gpio, SS will be inactivated between every words. The word here
means the data sent once which length can be set as 1/2/4 bytes.

In the isr function, we read the FSR_RXCOUNT just behind the
fsl_lpspi_read_rx_fifo. This causes the value of FSR_RXCOUNT cannot
reflect whether there is still data not sent timely. So do this
judgement by FSR_TXCOUNT.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

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Clark Wang 2019-03-21 09:57:12 +00:00 • committed by Mark Brown

parent f37d8e67f3

commit 69c8a9bcb0

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drivers/spi/spi-fsl-lpspi.c

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