+ Mark Brown
Chunyan,
On 11/21/2018 5:17 PM, Faiz Abbas wrote:
Hi Chunyan,
On 12/11/18 12:56 PM, Chunyan Zhang wrote:
Currently the generic SDHCI code in the Linux kernel supports the SD
standard DMA integrated into the host controller but does not have any
support for external DMA controllers implemented using dmaengine meaning
that custom code is needed for any systems that use a generic DMA
controller with SDHCI which in practice means any SDHCI controller that
doesn't have an integrated DMA controller so we should have this as a
generic feature.
There are already a number of controller specific drivers that have dmaengine
code, and some could use sdhci.c actually, but needed to implement mmc_ops->request()
in their specific driver for sending command with external dma using dmaengine
framework, with this patchset, them will take advantage of the generic support.
TI's omap controller is the case as an example.
Any comments are very appreciated.
This is great. It helps us move am335x and am43xx platforms to
sdhci-omap. What platforms have you tested this on?
Gentle ping on this. I tried testing these with an am335x-evm board. In
their current condition, the card fails to enumerate altogether. The
changes suggested by Adrian should fix this. Let me know when you post a v3.
Thanks,
Faiz
