Re: Non-coherent (streaming) contig-dma?

2016-04-19 Thread Krzysztof Hałasa
Sakari Ailus writes: > I sent the set here under the subject "[RFC RESEND 00/11] vb2: Handle user > cache hints, allow drivers to choose cache coherency" last September. Thanks, I will look at this. Unfortunately, I need CPU access to the buffers, it's just that coherent

Re: Non-coherent (streaming) contig-dma?

2016-04-06 Thread Sakari Ailus
On Mon, Apr 04, 2016 at 02:53:29PM +0200, Krzysztof Hałasa wrote: > Hi, > > I know certain approaches had been tried to allow use of streaming DMA > (dma_map_single() etc. - i.e., not coherent) in the media drivers, is > there something which can be used at this point (for MMAP method)? > >

Non-coherent (streaming) contig-dma?

2016-04-04 Thread Krzysztof Hałasa
Hi, I know certain approaches had been tried to allow use of streaming DMA (dma_map_single() etc. - i.e., not coherent) in the media drivers, is there something which can be used at this point (for MMAP method)? Coherent buffers on many systems are very slow (uncacheable), should i simply