diff options
| author | Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> | 2022-09-14 13:23:47 +0530 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2022-10-05 17:17:03 -0500 |
| commit | aa4b1753625ce97a703e71928f67bac07d9d2b55 (patch) | |
| tree | bb597bfb044c96b6dab7ef9fdc1861baf518db2e /drivers/pci | |
| parent | 299915d6bee257880139528cd3d293707717eca5 (diff) | |
| download | linux-aa4b1753625ce97a703e71928f67bac07d9d2b55.tar.bz2 | |
PCI: qcom-ep: Make PERST separation optional
PERST separation is an optional debug feature used to collect the crash
dump from the PCIe endpoint devices by the PCIe host when the endpoint
crashes. This feature keeps the PCIe link up by separating the PCIe IP
block from the SoC reset logic.
Make the property optional in the driver.
Link: https://lore.kernel.org/r/20220914075350.7992-10-manivannan.sadhasivam@linaro.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/controller/dwc/pcie-qcom-ep.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c index c2585cdaa501..b11d26e50aa2 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c @@ -220,8 +220,10 @@ static int qcom_pcie_ep_core_reset(struct qcom_pcie_ep *pcie_ep) */ static void qcom_pcie_ep_configure_tcsr(struct qcom_pcie_ep *pcie_ep) { - regmap_write(pcie_ep->perst_map, pcie_ep->perst_en, 0); - regmap_write(pcie_ep->perst_map, pcie_ep->perst_sep_en, 0); + if (pcie_ep->perst_map) { + regmap_write(pcie_ep->perst_map, pcie_ep->perst_en, 0); + regmap_write(pcie_ep->perst_map, pcie_ep->perst_sep_en, 0); + } } static int qcom_pcie_dw_link_up(struct dw_pcie *pci) @@ -478,8 +480,8 @@ static int qcom_pcie_ep_get_io_resources(struct platform_device *pdev, syscon = of_parse_phandle(dev->of_node, "qcom,perst-regs", 0); if (!syscon) { - dev_err(dev, "Failed to parse qcom,perst-regs\n"); - return -EINVAL; + dev_dbg(dev, "PERST separation not available\n"); + return 0; } pcie_ep->perst_map = syscon_node_to_regmap(syscon); |