[PATCH mmc-next v3 0/3] solve SDHCI DWC MSHC 128MB DMA boundary limitation

[Jisheng Zhang]

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_num to struct sdhci_host so that driver can
control the ADMA table number.
patch2 introduces adma_write_desc() hook to struct sdhci_ops so that
driver can override it.
patch3 finally solves the 128MB boundary limitation.

since v2:
  - make use of "likely" to check (!len || BOUNDARY_OK(addr, len))
  - explictly 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_num 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 | 43 ++++++++++++++++++++++++++
 drivers/mmc/host/sdhci.c            | 48 +++++++++++++++++++----------
 drivers/mmc/host/sdhci.h            |  8 +++++
 3 files changed, 83 insertions(+), 16 deletions(-)

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2.18.0