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(-) -- 2.18.0 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
