linux-kernel - [PATCH] PCI: designware-ep: Fix the Header Type check

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Date:   Fri, 14 Aug 2020 16:08:13 +0800
From:   Zhiqiang Hou <Zhiqiang.Hou@....com>
To:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        lorenzo.pieralisi@....com, robh@...nel.org, bhelgaas@...gle.com,
        amurray@...goodpenguin.co.uk, jingoohan1@...il.com,
        gustavo.pimentel@...opsys.com
Cc:     Hou Zhiqiang <Zhiqiang.Hou@....com>
Subject: [PATCH] PCI: designware-ep: Fix the Header Type check

From: Hou Zhiqiang <Zhiqiang.Hou@....com>

The current check will result in the multiple function device
fails to initialize. So fix the check by masking out the
multiple function bit.

Fixes: 0b24134f7888 ("PCI: dwc: Add validation that PCIe core is set to correct mode")
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
---
 drivers/pci/controller/dwc/pcie-designware-ep.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 4680a51c49c0..4b7abfb1e669 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -654,7 +654,7 @@ int dw_pcie_ep_init_complete(struct dw_pcie_ep *ep)
 	int i;
 
 	hdr_type = dw_pcie_readb_dbi(pci, PCI_HEADER_TYPE);
-	if (hdr_type != PCI_HEADER_TYPE_NORMAL) {
+	if (hdr_type & 0x7f != PCI_HEADER_TYPE_NORMAL) {
 		dev_err(pci->dev,
 			"PCIe controller is not set to EP mode (hdr_type:0x%x)!\n",
 			hdr_type);
-- 
2.17.1