lkml.org 
[lkml]   [2018]   [Nov]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v2 0/3] Add support for using external dma in SDHCI
From
Date
+ 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

\
 
 \ /
  Last update: 2018-11-28 18:01    [W:0.166 / U:0.056 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site