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PCI: rockchip: Assert PCI Configuration Enable bit after probe

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commit f397fd4ac1 upstream.

Assert PCI Configuration Enable bit after probe. When this bit is left to
0 in the endpoint mode, the RK3399 PCIe endpoint core will generate
configuration request retry status (CRS) messages back to the root complex.
Assert this bit after probe to allow the RK3399 PCIe endpoint core to reply
to configuration requests from the root complex.
This is documented in section 17.5.8.1.2 of the RK3399 TRM.

Link: https://lore.kernel.org/r/20230418074700.1083505-4-rick.wertenbroek@gmail.com
Fixes: cf590b0783 ("PCI: rockchip: Add EP driver for Rockchip PCIe controller")
Tested-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Rick Wertenbroek <rick.wertenbroek@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rick Wertenbroek
2023-04-18 09:46:50 +02:00
committed by Greg Kroah-Hartman
parent e8cc74b6b4
commit 20c62b3c1e
1 changed files with 3 additions and 0 deletions
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3
drivers/pci/controller/pcie-rockchip-ep.c
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@@ -631,6 +631,9 @@ static int rockchip_pcie_ep_probe(struct platform_device *pdev)
ep->irq_pci_addr = ROCKCHIP_PCIE_EP_DUMMY_IRQ_ADDR;
rockchip_pcie_write(rockchip, PCIE_CLIENT_CONF_ENABLE,
PCIE_CLIENT_CONFIG);
return 0;
err_epc_mem_exit:
pci_epc_mem_exit(epc);