mbox series

[v2,0/3] arm64: qcom: sa8775p: add cache coherency support for SA8775P

Message ID 1699674876-4982-1-git-send-email-quic_msarkar@quicinc.com
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Series arm64: qcom: sa8775p: add cache coherency support for SA8775P | expand

Message

Mrinmay Sarkar Nov. 11, 2023, 3:54 a.m. UTC 
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@quicinc.com/

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(+)