On Wed, May 20, 2015 at 6:20 PM, Russell King - ARM Linux
wrote:
> On Wed, May 20, 2015 at 02:57:36PM +0200, Lorenzo Nava wrote:
>> so probably currently is impossible to allocate a contiguous cachable
>> DMA memory. You can't use CMA, and the only functions which allow you
>> to use it are not co
On Wed, May 20, 2015 at 02:57:36PM +0200, Lorenzo Nava wrote:
> so probably currently is impossible to allocate a contiguous cachable
> DMA memory. You can't use CMA, and the only functions which allow you
> to use it are not compatible with sync functions.
> Do you think the problem is the CMA des
On Wed, May 20, 2015 at 12:34 AM, Russell King - ARM Linux
wrote:
> On Wed, May 20, 2015 at 12:14:48AM +0200, Arnd Bergmann wrote:
>> With that memory, you should be able to use the normal streaming
>> API (dma_sync_single_for_*).
>
> Wrong, as I've pointed out previously. The only memory which y
On Wed, May 20, 2015 at 12:14:48AM +0200, Arnd Bergmann wrote:
> With that memory, you should be able to use the normal streaming
> API (dma_sync_single_for_*).
Wrong, as I've pointed out previously. The only memory which you're
allowed to sync is with memory which has been mapped with a dma_map_
On Wed, May 20, 2015 at 12:14 AM, Arnd Bergmann wrote:
> On Wednesday 20 May 2015 00:05:54 Lorenzo Nava wrote:
>>
>> On Tue, May 19, 2015 at 6:34 PM, Catalin Marinas
>> wrote:
>> > On Mon, May 18, 2015 at 10:56:06PM +0200, Lorenzo Nava wrote:
>> >> it's been a while since I've started working wit
On Wednesday 20 May 2015 00:05:54 Lorenzo Nava wrote:
>
> On Tue, May 19, 2015 at 6:34 PM, Catalin Marinas
> wrote:
> > On Mon, May 18, 2015 at 10:56:06PM +0200, Lorenzo Nava wrote:
> >> it's been a while since I've started working with DMA on ARM processor
> >> for a smart camera project. Typica
On Wed, May 20, 2015 at 12:05:54AM +0200, Lorenzo Nava wrote:
> Maybe my interpretation of dma_alloc_coherent() is not correct, and
> the coherency can be managed using the dma_sync_single_for_* functions
> and it doesn't require hardware mechanism.
dma_sync_single_for_* are only for use with the
On Tue, May 19, 2015 at 6:34 PM, Catalin Marinas
wrote:
> On Mon, May 18, 2015 at 10:56:06PM +0200, Lorenzo Nava wrote:
>> it's been a while since I've started working with DMA on ARM processor
>> for a smart camera project. Typically the requirements is to have a
>> large memory area which can be
Thanks for the answer. I do agree with you on that: I'll take a look
at arm64 code and I'll be glad to contribute with patches as soon as
possible.
Anyway I'd like to focus on a different aspect: I think that this
solution can manage cache coherent DMA, so devices which guarantees
the coherency us
On Mon, May 18, 2015 at 10:56:06PM +0200, Lorenzo Nava wrote:
> it's been a while since I've started working with DMA on ARM processor
> for a smart camera project. Typically the requirements is to have a
> large memory area which can be accessed by both DMA and user. I've
> already noticed that ma
Hello,
it's been a while since I've started working with DMA on ARM processor
for a smart camera project. Typically the requirements is to have a
large memory area which can be accessed by both DMA and user. I've
already noticed that many people wonder about which would be the best
way to have dat
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