In a multiprocessor system cache snooping maintains the consistency of caches. Snooping logic is disabled from HW on this platform. Cache coherency doesn’t work without enabling this logic. This series is to enable cache snooping logic in both RC and EP driver and add the "dma-coherent" property in dtsi to support cache coherency in 8775 platform. To verify this series we required [1] [1] https://lore.kernel.org/all/1699669982-7691-1-git-send-email-quic_msarkar@xxxxxxxxxxx/ v1 -> v2: - update cover letter with explanation. - define each of these bits and ORing at usage time rather than directly writing value in register. Mrinmay Sarkar (3): PCI: qcom: Enable cache coherency for SA8775P RC PCI: qcom-ep: Enable cache coherency for SA8775P EP arm64: dts: qcom: sa8775p: Mark PCIe controller as cache coherent arch/arm64/boot/dts/qcom/sa8775p.dtsi | 1 + drivers/pci/controller/dwc/pcie-qcom-ep.c | 10 ++++++++++ drivers/pci/controller/dwc/pcie-qcom.c | 13 +++++++++++++ 3 files changed, 24 insertions(+) -- 2.7.4
