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| author | Robin Gong <yibin.gong@nxp.com> | 2020-06-17 06:42:08 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-06-23 13:38:14 +0100 |
| commit | 809b1b04df898b6d182069146231a3cbf5f2d9cc (patch) | |
| tree | 64458c4970bab1cdccef890aa54f6267fa28c346 /drivers/spi/spi-imx.c | |
| parent | c314360cea42e9481d9f68a73a3a776eba31ba4b (diff) | |
| download | linux-809b1b04df898b6d182069146231a3cbf5f2d9cc.tar.gz linux-809b1b04df898b6d182069146231a3cbf5f2d9cc.tar.bz2 linux-809b1b04df898b6d182069146231a3cbf5f2d9cc.zip | |
spi: introduce fallback to pio
Add fallback to pio mode in case dma transfer failed with error status
SPI_TRANS_FAIL_NO_START.
If spi client driver want to enable this feature please set xfer->error in
the proper place such as dmaengine_prep_slave_sg() failure detect(but no
any data put into spi bus yet). Besides, add master->fallback checking in
its can_dma() so that spi core could switch to pio next time. Please refer
to spi-imx.c.
Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Link: https://lore.kernel.org/r/1592347329-28363-2-git-send-email-yibin.gong@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-imx.c')
0 files changed, 0 insertions, 0 deletions