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PCI: altera: Check TLP completion status

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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>
This commit is contained in:
Ley Foon Tan 2015-12-04 16:21:16 -06:00 committed by Bjorn Helgaas
parent 23ec56708a
commit ea1d3795f6
1 changed files with 10 additions and 2 deletions
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12
drivers/pci/host/pcie-altera.c
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@ -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,