[PATCH v2 0/2] introduce fallback to pio in spi core
broonie at kernel.org
Wed Jun 24 11:38:52 EDT 2020
On Wed, 17 Jun 2020 06:42:07 +0800, Robin Gong wrote:
> Introudce fallback pio way at spi core level so that the tx/rx buffer
> mapped by spi core for dma could be unmap and fallback pio again. Hence no
> need the below patch where 'dma_sync_sg_for_devic' to sync fresh data back
> into 'device' memory and sync to 'cpu' again in spi core.
> If you want to use this fallback feature, please set xfer->error with
> SPI_TRANS_FAIL_NO_START in case dma transfer failed(but no any data push
> into spi bus yet) in spi client driver and add 'master->fallback' checking
> in your can_dma() to ensure spi core can fallback to pio next time.
[1/2] spi: introduce fallback to pio
[2/2] spi: imx: add fallback feature
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