linux-kernel - [PATCH v2 2/2] PCI: designware: let dw_pcie_link

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Date:	Wed, 10 Aug 2016 18:07:03 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	<jingoohan1@...il.com>, <pratyush.anand@...il.com>,
	<bhelgaas@...gle.com>, <Joao.Pinto@...opsys.com>
CC:	<linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Jisheng Zhang <jszhang@...vell.com>
Subject: [PATCH v2 2/2] PCI: designware: let dw_pcie_link_up() beware of LTSSM training bit

The link may be UP but still in link training. In this case, we can't
think the link is up and operating correctly. So we need to teach
dw_pcie_link_up() beware of the PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING bit.

This patch also rewrite PCIE_PHY_DEBUG_R1_LINK_UP definition so that
it's consistent with other MACROS.

Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
Acked-by: Joao Pinto <jpinto@...opsys.com>
---
 drivers/pci/host/pcie-designware.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index 24a16dd..6cc21bb 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -73,7 +73,8 @@
 /* PCIe Port Logic registers */
 #define PLR_OFFSET			0x700
 #define PCIE_PHY_DEBUG_R1		(PLR_OFFSET + 0x2c)
-#define PCIE_PHY_DEBUG_R1_LINK_UP	0x00000010
+#define PCIE_PHY_DEBUG_R1_LINK_UP	(0x1 << 4)
+#define PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING	(0x1 << 29)
 
 /* Parameters for the waiting for link up routine */
 #define LINK_WAIT_MAX_RETRIES		10
@@ -417,7 +418,8 @@ int dw_pcie_link_up(struct pcie_port *pp)
 		return pp->ops->link_up(pp);
 
 	val = readl(pp->dbi_base + PCIE_PHY_DEBUG_R1);
-	return val & PCIE_PHY_DEBUG_R1_LINK_UP;
+	return ((val & PCIE_PHY_DEBUG_R1_LINK_UP) &&
+		(!(val & PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING)));
 }
 
 static int dw_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
-- 
2.8.1