Re: [RFC PATCH v6 0/5] treewide: improve R-Car SDHI performance

2019-06-13 Thread Wolfram Sang
On Thu, Jun 13, 2019 at 07:20:10PM +0900, Yoshihiro Shimoda wrote: > This patch series is based on iommu.git / next branch. > > Since SDHI host internal DMAC of the R-Car Gen3 cannot handle two or > more segments, the performance rate (especially, eMMC HS400 reading) > is not good. However, if

[RFC PATCH v6 0/5] treewide: improve R-Car SDHI performance

2019-06-13 Thread Yoshihiro Shimoda
This patch series is based on iommu.git / next branch. Since SDHI host internal DMAC of the R-Car Gen3 cannot handle two or more segments, the performance rate (especially, eMMC HS400 reading) is not good. However, if IOMMU is enabled on the DMAC, since IOMMU will map multiple scatter gather