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Merge branch 'pci/controller/cadence'

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- Clear the ARI Capability Next Function Number of the last function
  (Jasko-EXT Wojciech)

* pci/controller/cadence:
  PCI: cadence: Clear the ARI Capability Next Function Number of the last function
This commit is contained in:
Bjorn Helgaas 2024-03-12 12:14:25 -05:00
commit 538ca00225
2 changed files with 19 additions and 1 deletions
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14
drivers/pci/controller/cadence/pcie-cadence-ep.c
View File

@ -565,7 +565,8 @@ static int cdns_pcie_ep_start(struct pci_epc *epc)
struct cdns_pcie *pcie = &ep->pcie;
struct device *dev = pcie->dev;
int max_epfs = sizeof(epc->function_num_map) * 8;
int ret, value, epf;
int ret, epf, last_fn;
u32 reg, value;
/*
* BIT(0) is hardwired to 1, hence function 0 is always enabled
@ -573,6 +574,17 @@ static int cdns_pcie_ep_start(struct pci_epc *epc)
*/
cdns_pcie_writel(pcie, CDNS_PCIE_LM_EP_FUNC_CFG, epc->function_num_map);
/*
* Next function field in ARI_CAP_AND_CTR register for last function
* should be 0.
* Clearing Next Function Number field for the last function used.
*/
last_fn = find_last_bit(&epc->function_num_map, BITS_PER_LONG);
reg = CDNS_PCIE_CORE_PF_I_ARI_CAP_AND_CTRL(last_fn);
value = cdns_pcie_readl(pcie, reg);
value &= ~CDNS_PCIE_ARI_CAP_NFN_MASK;
cdns_pcie_writel(pcie, reg, value);
if (ep->quirk_disable_flr) {
for (epf = 0; epf < max_epfs; epf++) {
if (!(epc->function_num_map & BIT(epf)))

6
drivers/pci/controller/cadence/pcie-cadence.h
View File

@ -130,6 +130,12 @@
#define CDNS_PCIE_EP_FUNC_DEV_CAP_OFFSET 0xc0
#define CDNS_PCIE_EP_FUNC_SRIOV_CAP_OFFSET 0x200
/*
* Endpoint PF Registers
*/
#define CDNS_PCIE_CORE_PF_I_ARI_CAP_AND_CTRL(fn) (0x144 + (fn) * 0x1000)
#define CDNS_PCIE_ARI_CAP_NFN_MASK GENMASK(15, 8)
/*
* Root Port Registers (PCI configuration space for the root port function)
*/