On 02.05.2023 08:28, Jaewon Kim wrote:
> Support interrupt based pio mode to optimize cpu usage.
> When transmitting data size is larget than 32 bytes, operates with
> interrupt based pio mode.
>
> By using the FIFORDY INT, an interrupt can be triggered when
> the desired size of data has been received. Using this, we can support
> interrupt based pio mode.
>
> Signed-off-by: Jaewon Kim <jaewon02.kim@xxxxxxxxxxx>
This patch landed recently in linux-next as commit 1ee806718d5e ("spi:
s3c64xx: support interrupt based pio mode"). Unfortunately it breaks
ethernet chip operation on Exynos3250 based Artik5 Development board. I
see the flood of the following messages:
[ 36.097739] ax88796c spi0.0: I/O Error: rx-1 tx-0 rx-f tx-p len-496
dma-1 res-(-5)
[ 36.100877] ax88796c spi0.0: RX residue: 248
[ 36.101383] ax88796c spi0.0: SPI transfer failed: -5
[ 36.101939] spi_master spi0: failed to transfer one message from queue
[ 36.102439] ax88796c spi0.0: axspi_read_rxq() failed: ret = -5
[ 36.107830] s3c64xx-spi 13920000.spi: Failed to get RX DMA channel
[ 36.148875] ax88796c spi0.0: I/O Error: rx-0 tx-1 rx-p tx-f len-4
dma-0 res-(-5)
[ 36.149517] ax88796c spi0.0: SPI transfer failed: -5
[ 36.150053] spi_master spi0: failed to transfer one message from queue
[ 36.150562] ax88796c spi0.0: axspi_read_reg() failed: ret = -5
[ 36.152175] s3c64xx-spi 13920000.spi: Failed to get RX DMA channel
[ 36.191651] ax88796c spi0.0: I/O Error: rx-0 tx-1 rx-p tx-f len-4
dma-0 res-(-5)
[ 36.192268] ax88796c spi0.0: SPI transfer failed: -5
...
I didn't analyze the details, but imho it looks like some kind of
mishandling of the corner case or switching between PIO and DMA mode. I
will check the details later.
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
