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| author | Clark Wang <xiaoning.wang@nxp.com> | 2019-03-21 10:57:12 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2019-03-21 16:02:28 +0100 |
| commit | 69c8a9bcb03222ad3b949064ac05de463c7c9aa3 (patch) | |
| tree | 2d2fc0763f1d4882342cf4769c21e92b060683c9 /drivers/spi/spi-tegra20-slink.c | |
| parent | spi : spi-topcliff-pch: Fix to handle empty DMA buffers (diff) | |
| download | linux-69c8a9bcb03222ad3b949064ac05de463c7c9aa3.tar.xz linux-69c8a9bcb03222ad3b949064ac05de463c7c9aa3.zip | |
spi: lpspi: fix dataloss when SS is inactivated between every words
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>
Diffstat (limited to 'drivers/spi/spi-tegra20-slink.c')
0 files changed, 0 insertions, 0 deletions