diff options
| -rw-r--r-- | drivers/pci/controller/cadence/pci-j721e.c | 3 | ||||
| -rw-r--r-- | drivers/pci/controller/cadence/pcie-cadence-ep.c | 18 | ||||
| -rw-r--r-- | drivers/pci/controller/cadence/pcie-cadence.h | 3 |
3 files changed, 23 insertions, 1 deletions
diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c index 768d33f9ebc8..a82f845cc4b5 100644 --- a/drivers/pci/controller/cadence/pci-j721e.c +++ b/drivers/pci/controller/cadence/pci-j721e.c @@ -69,6 +69,7 @@ struct j721e_pcie_data { enum j721e_pcie_mode mode; unsigned int quirk_retrain_flag:1; unsigned int quirk_detect_quiet_flag:1; + unsigned int quirk_disable_flr:1; u32 linkdown_irq_regfield; unsigned int byte_access_allowed:1; }; @@ -307,6 +308,7 @@ static const struct j721e_pcie_data j7200_pcie_rc_data = { static const struct j721e_pcie_data j7200_pcie_ep_data = { .mode = PCI_MODE_EP, .quirk_detect_quiet_flag = true, + .quirk_disable_flr = true, }; static const struct j721e_pcie_data am64_pcie_rc_data = { @@ -405,6 +407,7 @@ static int j721e_pcie_probe(struct platform_device *pdev) return -ENOMEM; ep->quirk_detect_quiet_flag = data->quirk_detect_quiet_flag; + ep->quirk_disable_flr = data->quirk_disable_flr; cdns_pcie = &ep->pcie; cdns_pcie->dev = dev; diff --git a/drivers/pci/controller/cadence/pcie-cadence-ep.c b/drivers/pci/controller/cadence/pcie-cadence-ep.c index 18e32b8ffd5e..b8b655d4047e 100644 --- a/drivers/pci/controller/cadence/pcie-cadence-ep.c +++ b/drivers/pci/controller/cadence/pcie-cadence-ep.c @@ -564,7 +564,8 @@ static int cdns_pcie_ep_start(struct pci_epc *epc) struct cdns_pcie_ep *ep = epc_get_drvdata(epc); struct cdns_pcie *pcie = &ep->pcie; struct device *dev = pcie->dev; - int ret; + int max_epfs = sizeof(epc->function_num_map) * 8; + int ret, value, epf; /* * BIT(0) is hardwired to 1, hence function 0 is always enabled @@ -572,6 +573,21 @@ static int cdns_pcie_ep_start(struct pci_epc *epc) */ cdns_pcie_writel(pcie, CDNS_PCIE_LM_EP_FUNC_CFG, epc->function_num_map); + if (ep->quirk_disable_flr) { + for (epf = 0; epf < max_epfs; epf++) { + if (!(epc->function_num_map & BIT(epf))) + continue; + + value = cdns_pcie_ep_fn_readl(pcie, epf, + CDNS_PCIE_EP_FUNC_DEV_CAP_OFFSET + + PCI_EXP_DEVCAP); + value &= ~PCI_EXP_DEVCAP_FLR; + cdns_pcie_ep_fn_writel(pcie, epf, + CDNS_PCIE_EP_FUNC_DEV_CAP_OFFSET + + PCI_EXP_DEVCAP, value); + } + } + ret = cdns_pcie_start_link(pcie); if (ret) { dev_err(dev, "Failed to start link\n"); diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h index 1ffa8fa77a8a..190786e47df9 100644 --- a/drivers/pci/controller/cadence/pcie-cadence.h +++ b/drivers/pci/controller/cadence/pcie-cadence.h @@ -127,6 +127,7 @@ #define CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET 0x90 #define CDNS_PCIE_EP_FUNC_MSIX_CAP_OFFSET 0xb0 +#define CDNS_PCIE_EP_FUNC_DEV_CAP_OFFSET 0xc0 #define CDNS_PCIE_EP_FUNC_SRIOV_CAP_OFFSET 0x200 /* @@ -361,6 +362,7 @@ struct cdns_pcie_epf { * minimize time between read and write * @epf: Structure to hold info about endpoint function * @quirk_detect_quiet_flag: LTSSM Detect Quiet min delay set as quirk + * @quirk_disable_flr: Disable FLR (Function Level Reset) quirk flag */ struct cdns_pcie_ep { struct cdns_pcie pcie; @@ -376,6 +378,7 @@ struct cdns_pcie_ep { spinlock_t lock; struct cdns_pcie_epf *epf; unsigned int quirk_detect_quiet_flag:1; + unsigned int quirk_disable_flr:1; }; |