UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

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>
This commit is contained in:
Manivannan Sadhasivam 2022-09-14 13:23:47 +05:30 committed by Bjorn Helgaas
parent 299915d6be
commit aa4b175362
1 changed files with 6 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/pci/controller/dwc/pcie-qcom-ep.c
View File

@ -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);