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PCI: cadence: Clear the ARI Capability Next Function Number of the last function

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Next Function Number field in ARI Capability Register for last function
must be zero by default as per the PCIe specification, indicating there
is no next higher number function but that's not happening in our case,
so this patch clears the Next Function Number field for last function
used.

[kwilczynski: white spaces update for one define]
Link: https://lore.kernel.org/linux-pci/20231202085015.3048516-1-s-vadapalli@ti.com
Signed-off-by: Jasko-EXT Wojciech <wojciech.jasko-EXT@continental-corporation.com>
Signed-off-by: Achal Verma <a-verma1@ti.com>
Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com>
This commit is contained in:
Jasko-EXT Wojciech 2023-12-02 14:20:15 +05:30 committed by Krzysztof Wilczyński
parent 6613476e22
commit 667a006d73
No known key found for this signature in database
GPG Key ID: 7C64768D3DE334E7
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)
*/