6.6-stable review patch. If anyone has any objections, please let me know.
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From: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org
[ Upstream commit 912315715d7b74f7abdb6f063ebace44ee288af9 ]
All EP specific resources are enabled during PERST# deassert. As a counter operation, all resources should be disabled during PERST# assert. There is no point in skipping that if the link was not enabled.
This will also result in enablement of the resources twice if PERST# got deasserted again. So remove the check from qcom_pcie_perst_assert() and disable all the resources unconditionally.
Fixes: f55fee56a631 ("PCI: qcom-ep: Add Qualcomm PCIe Endpoint controller driver") Link: https://lore.kernel.org/linux-pci/20240430-pci-epf-rework-v4-1-22832d0d456f@... Tested-by: Niklas Cassel cassel@kernel.org Signed-off-by: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org Signed-off-by: Krzysztof Wilczyński kwilczynski@kernel.org Signed-off-by: Bjorn Helgaas bhelgaas@google.com Reviewed-by: Niklas Cassel cassel@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/controller/dwc/pcie-qcom-ep.c | 6 ------ 1 file changed, 6 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c index 9b62ee6992f0e..66e080c99d5df 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c @@ -519,12 +519,6 @@ static int qcom_pcie_perst_deassert(struct dw_pcie *pci) static void qcom_pcie_perst_assert(struct dw_pcie *pci) { struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci); - struct device *dev = pci->dev; - - if (pcie_ep->link_status == QCOM_PCIE_EP_LINK_DISABLED) { - dev_dbg(dev, "Link is already disabled\n"); - return; - }
qcom_pcie_disable_resources(pcie_ep); pcie_ep->link_status = QCOM_PCIE_EP_LINK_DISABLED;