This register is applicable only when the controller is configured for Endpoint mode, which is not the case for the current version of this driver. Attempting to remove this code though caused some ath10k cards to stop working, so for some unknown reason it is needed here. This should be investigated and a comment explaining this should be put before the code, so we add a FIXME comment for now. Signed-off-by: Pali Rohár <pali@xxxxxxxxxx> --- drivers/pci/controller/pci-aardvark.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c index 2ecc79c03ade..8332c71d69fa 100644 --- a/drivers/pci/controller/pci-aardvark.c +++ b/drivers/pci/controller/pci-aardvark.c @@ -439,6 +439,13 @@ static void advk_pcie_setup_hw(struct advk_pcie *pcie) advk_pcie_train_link(pcie); + /* + * FIXME: The following register update is suspicious. This register is + * applicable only when the PCI controller is configured for Endpoint + * mode, not as a Root Complex. But apparently when this code is + * removed, some cards stop working. This should be investigated and + * a comment explaining this should be put here. + */ reg = advk_readl(pcie, PCIE_CORE_CMD_STATUS_REG); reg |= PCIE_CORE_CMD_MEM_ACCESS_EN | PCIE_CORE_CMD_IO_ACCESS_EN | -- 2.20.1
