On 28 August 2018 at 11:45, Jisheng Zhang <Jisheng.Zhang@xxxxxxxxxxxxx> wrote: > When using DMA, if the DMA addr spans 128MB boundary, we have to split > the DMA transfer into two so that each one doesn't exceed the boundary. > > patch1 adds adma_table_cnt to struct sdhci_host so that driver can > control the ADMA table count. > patch2 introduces adma_write_desc() hook to struct sdhci_ops so that > driver can override it. > patch3 finally solves the 128MB boundary limitation. > > since v5: > - use dma_get_required_mask() to calculate the extra adma_table_cnt > > since v4: > - add Adrian's ack to patch 1 and patch 2 > - address Adrian's comment -- if the boundary is fine, we have to > return after writing dma desc once; adma_table_cnt updating could > make use of the fact that it's already initialized by the common > sdhci code, we just need to tune. > > since v3: > - s/adma_table_num/adma_table_cnt > - add comment to adma_table_cnt > - make the exported function name without the _ > - let sdhci_adma_write_desc() accept &desc param and set the new desc > value > > since v2: > - make use of "likely" to check (!len || BOUNDARY_OK(addr, len)) > - explicitly include <linux/sizes.h> for SZ_128M > > since v1: > - fix BOUNDARY_OK macro if addr+len is aligned to 128MB > - use DIV_ROUND_UP to cal extra desc num > - fix !len for dwcmshc_adma_write_desc() > > > > Jisheng Zhang (3): > mmc: sdhci: add adma_table_cnt member to struct sdhci_host > mmc: sdhci: introduce adma_write_desc() hook to struct sdhci_ops > mmc: sdhci-of-dwcmshc: solve 128MB DMA boundary limitation > > drivers/mmc/host/sdhci-of-dwcmshc.c | 39 +++++++++++++++++++++ > drivers/mmc/host/sdhci.c | 54 +++++++++++++++++------------ > drivers/mmc/host/sdhci.h | 7 ++++ > 3 files changed, 78 insertions(+), 22 deletions(-) > > -- > 2.18.0 > Applied for next, thanks! Kind regards Uffe
