Ishraq Ibne Ashraf
2017-10-12 20:43:19 UTC
Hi,
In our system A10s (sun5i) with kernel 4.13 from sunxi-next branch we use
SPI.
Everything works but with SPI communication there is significantly
increased CPU load.
This made me think one possible reason could be that DMA isn't enabled in
this case.
So what is the state of SPI DMA in this case?
According to the kernel source it seems like that sun4i-spi is used for
A10s.
Is DMA working ? If not then any clues how it can be enabled or what is the
current state?
Cheers,
Ishraq Ibne Ashraf
In our system A10s (sun5i) with kernel 4.13 from sunxi-next branch we use
SPI.
Everything works but with SPI communication there is significantly
increased CPU load.
This made me think one possible reason could be that DMA isn't enabled in
this case.
So what is the state of SPI DMA in this case?
According to the kernel source it seems like that sun4i-spi is used for
A10s.
Is DMA working ? If not then any clues how it can be enabled or what is the
current state?
Cheers,
Ishraq Ibne Ashraf
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