diff options
| author | Ley Foon Tan <lftan@altera.com> | 2015-12-04 16:21:16 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2015-12-04 16:21:16 -0600 |
| commit | ea1d3795f65e14619642b5f67382800f58e43f3d (patch) | |
| tree | 49c6c45b9c7cb4c8360034d1cd4611a9305304a4 /drivers/pci/host/pcie-altera.c | |
| parent | 23ec56708af7155414a979675dc8132a5d6e16ef (diff) | |
| download | linux-ea1d3795f65e14619642b5f67382800f58e43f3d.tar.bz2 | |
PCI: altera: Check TLP completion status
Check TLP packet successful completion status. This fix the issue when
accessing multi-function devices in enumeration process, TLP will return
error when accessing non-exist function number. Returns PCI error code
instead of generic errno.
Tested on Ethernet adapter card with multi-functions.
[bhelgaas: simplify completion status checking code]
Signed-off-by: Ley Foon Tan <lftan@altera.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/host/pcie-altera.c')
| -rw-r--r-- | drivers/pci/host/pcie-altera.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/pci/host/pcie-altera.c b/drivers/pci/host/pcie-altera.c index ed736a94eade..072255d5b31c 100644 --- a/drivers/pci/host/pcie-altera.c +++ b/drivers/pci/host/pcie-altera.c @@ -55,6 +55,7 @@ #define TLP_CFG_DW2(bus, devfn, offset) \ (((bus) << 24) | ((devfn) << 16) | (offset)) #define TLP_REQ_ID(bus, devfn) (((bus) << 8) | (devfn)) +#define TLP_COMP_STATUS(s) (((s) >> 12) & 7) #define TLP_HDR_SIZE 3 #define TLP_LOOP 500 #define RP_DEVFN 0 @@ -171,6 +172,7 @@ static int tlp_read_packet(struct altera_pcie *pcie, u32 *value) bool sop = 0; u32 ctrl; u32 reg0, reg1; + u32 comp_status = 1; /* * Minimum 2 loops to read TLP headers and 1 loop to read data @@ -182,19 +184,25 @@ static int tlp_read_packet(struct altera_pcie *pcie, u32 *value) reg0 = cra_readl(pcie, RP_RXCPL_REG0); reg1 = cra_readl(pcie, RP_RXCPL_REG1); - if (ctrl & RP_RXCPL_SOP) + if (ctrl & RP_RXCPL_SOP) { sop = true; + comp_status = TLP_COMP_STATUS(reg1); + } if (ctrl & RP_RXCPL_EOP) { + if (comp_status) + return PCIBIOS_DEVICE_NOT_FOUND; + if (value) *value = reg0; + return PCIBIOS_SUCCESSFUL; } } udelay(5); } - return -ENOENT; + return PCIBIOS_DEVICE_NOT_FOUND; } static void tlp_write_packet(struct altera_pcie *pcie, u32 *headers, |