From: Ley Foon Tan <ley.foon.tan@intel.com>
Date: Fri, 24 May 2019 02:29:59 +0000 (+0800)
Subject: pci: intel: Fix error when enumerating multi-function PCIe device
X-Git-Tag: v2019.10-rc2~4^2~49
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=bf9b9813ad6c4727f733828a100267601cef52d2;p=platform%2Fkernel%2Fu-boot.git

pci: intel: Fix error when enumerating multi-function PCIe device

Hardware return completion status non-zero when read from non exist
function in multi-function PCIe device. Return error will cause PCIe
enumeration fail.

Change it to return 0 and return value 0xffffffff when error.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
---

diff --git a/drivers/pci/pcie_intel_fpga.c b/drivers/pci/pcie_intel_fpga.c
index e74b35a..a096d1c 100644
--- a/drivers/pci/pcie_intel_fpga.c
+++ b/drivers/pci/pcie_intel_fpga.c
@@ -161,8 +161,10 @@ static int tlp_read_packet(struct intel_fpga_pcie *pcie, u32 *value)
 			dw[count++] = cra_readl(pcie, RP_RXCPL_REG);
 			if (ctrl & RP_RXCPL_EOP) {
 				comp_status = TLP_COMP_STATUS(dw[1]);
-				if (comp_status)
-					return -EFAULT;
+				if (comp_status) {
+					*value = pci_get_ff(PCI_SIZE_32);
+					return 0;
+				}
 
 				if (value &&
 				    TLP_BYTE_COUNT(dw[1]) == sizeof(u32) &&