Re: [RFC] i.MX25/35/SDHCI: switch off DMA usage

2015-08-10 Thread Alexander Stein
Hello, On Wednesday 22 April 2015 15:33:00, Dong Aisheng wrote: > > On Friday 27 March 2015 12:44:03 Dong Aisheng wrote: > > > On Fri, Mar 27, 2015 at 11:52:04AM +0100, Juergen Borleis wrote: > > > > DMA and the required overhead on very small data blocks seems an > > > > expensive operation. Due

Re: [RFC] i.MX25/35/SDHCI: switch off DMA usage

2015-04-22 Thread Dong Aisheng
On Tue, Apr 14, 2015 at 11:42:00AM +0200, Juergen Borleis wrote: > Hi, > > On Friday 27 March 2015 12:44:03 Dong Aisheng wrote: > > On Fri, Mar 27, 2015 at 11:52:04AM +0100, Juergen Borleis wrote: > > > DMA and the required overhead on very small data blocks seems an > > > expensive operation. Due

Re: [RFC] i.MX25/35/SDHCI: switch off DMA usage

2015-04-14 Thread Juergen Borleis
Hi, On Friday 27 March 2015 12:44:03 Dong Aisheng wrote: > On Fri, Mar 27, 2015 at 11:52:04AM +0100, Juergen Borleis wrote: > > DMA and the required overhead on very small data blocks seems an > > expensive operation. Due to erratum ENGCM07207 for i.MX25 and i.MX35 SoCs > > the support for multibl

Re: [RFC] i.MX25/35/SDHCI: switch off DMA usage

2015-03-27 Thread Dong Aisheng
On Fri, Mar 27, 2015 at 11:52:04AM +0100, Juergen Borleis wrote: > DMA and the required overhead on very small data blocks seems an expensive > operation. Due to erratum ENGCM07207 for i.MX25 and i.MX35 SoCs the > support for multiblock transfers is disabled which results into a huge > amount of si

[RFC] i.MX25/35/SDHCI: switch off DMA usage

2015-03-27 Thread Juergen Borleis
DMA and the required overhead on very small data blocks seems an expensive operation. Due to erratum ENGCM07207 for i.MX25 and i.MX35 SoCs the support for multiblock transfers is disabled which results into a huge amount of single 512 byte sector transfers and interrupts. This slows down the transm