spi: lpspi: Improve the stability of lpspi data transmission

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Use SR_TDF to judge if need to send data, and SR_FCF is to judge if
transmission end and to replace the waiting after transmission end.
This waiting has no actual meaning, for module will set the FCF
flag at the real end.

The changes of interrupt flag and ISR function reduce the times of
calling ISR. The use of the FCF flag improves the stability of the
data transmission. These two points generally improve the data
transfer speed of lpspi, especially when it is set to slave mode
it can support higher transfer speed of the host.

After making these changes, there is no need to use
fsl_lpspi_txfifo_empty(), so remove it.

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

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Clark Wang 2019-01-07 07:47:38 +00:00 • committed by Mark Brown

parent 3c9bb6a639

commit c23fdef891

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1 changed files with 20 additions and 41 deletions

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drivers/spi/spi-fsl-lpspi.c

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