Keystone PCI devices requires the dma_pfn_offset to be set correctly so that the PCI devices get the right DMA mask to function. This patch adds a helper function to get this configuration from the root bridge's parent device. The probe.c code now calls this helper to set the default dma configuration if the parent device is dma capable. Typically, dma-ranges are defined in the DT node of the SoC and gets updated in the root bridge's parent device structure. My original patch for this was at [1] which was NACK-ed and this is an attempt to implement a better solution. This may have side effects that I am unware of. So sending as a RFC patch to get feedback before sending the formal patch. Please review and provide me the comment so that I can incorporate the same. [1] http://www.gossamer-threads.com/lists/linux/kernel/2024591 Murali Karicheri (2): common: dma-mapping: introduce dma_get_parent_cfg() helper PCI: get device dma configuration from parent drivers/base/dma-mapping.c | 18 ++++++++++++++++++ drivers/pci/probe.c | 20 +++++++++++++++++--- include/linux/dma-mapping.h | 3 +++ 3 files changed, 38 insertions(+), 3 deletions(-) -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
