On Mon, Feb 09, 2026 at 09:53:08PM +0900, Koichiro Den wrote: > Tested on > ========= > > I tested the embedded (DMA) doorbell fallback path (via pci-epf-test) on > R-Car Spider boards: > > $ ./pci_endpoint_test -t DOORBELL_TEST > TAP version 13 > 1..1 > # Starting 1 tests from 1 test cases. > # RUN pcie_ep_doorbell.DOORBELL_TEST ... > # OK pcie_ep_doorbell.DOORBELL_TEST > ok 1 pcie_ep_doorbell.DOORBELL_TEST > # PASSED: 1 / 1 tests passed. > # Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0 > > with the following message observed on the EP side: > > [ 80.464653] pci_epf_test pci_epf_test.0: Using embedded (DMA) doorbell > fallback > > (Note: for the test to pass on R-Car Spider, one of the following was > required: > - echo 1048576 > functions/pci_epf_test/func1/pci_epf_test.0/bar2_size > - apply > https://lore.kernel.org/all/[email protected]/)
I applied this series on top of branch pci/controller/dwc on Rock 5B (pcie-dw-rockchip.c). On EP side: [ 39.218533] pci_epf_test pci_epf_test.0: Can't find MSI domain for EPC [ 39.219125] pci_epf_test pci_epf_test.0: Using embedded (DMA) doorbell fallback On RC side: # RUN pcie_ep_doorbell.DOORBELL_TEST ... [ 40.297892] pci-endpoint-test 0000:01:00.0: Failed to trigger doorbell in endpoint # pci_endpoint_test.c:279:DOORBELL_TEST:Expected 0 (0) == ret (-22) # pci_endpoint_test.c:279:DOORBELL_TEST:Test failed for Doorbell # DOORBELL_TEST: Test failed # FAIL pcie_ep_doorbell.DOORBELL_TEST not ok 23 pcie_ep_doorbell.DOORBELL_TEST Any suggestions? (All BARs in pcie-dw-rockchip.c is marked as BAR_RESIZABLE.) Kind regards, Niklas
