linux-kernel - [PATCH] PCI: altera: fix altera_pcie_link_is

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Date:	Wed, 2 Mar 2016 17:43:07 +0800
From:	Ley Foon Tan <lftan@...era.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	<linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	Ley Foon Tan <lftan.linux@...il.com>,
	Ley Foon Tan <lftan@...era.com>
Subject: [PATCH] PCI: altera: fix altera_pcie_link_is_up()

The original code return true if RP_LTSSM register return non-zero
value. This fix to return true only RP_LTSSM register is in L0 state
(link up).

Signed-off-by: Ley Foon Tan <lftan@...era.com>
---
 drivers/pci/host/pcie-altera.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/host/pcie-altera.c b/drivers/pci/host/pcie-altera.c
index 99da549..dbac6fb 100644
--- a/drivers/pci/host/pcie-altera.c
+++ b/drivers/pci/host/pcie-altera.c
@@ -40,6 +40,7 @@
 #define P2A_INT_ENABLE			0x3070
 #define P2A_INT_ENA_ALL			0xf
 #define RP_LTSSM			0x3c64
+#define RP_LTSSM_MASK			0x1f
 #define LTSSM_L0			0xf
 
 /* TLP configuration type 0 and 1 */
@@ -140,7 +141,7 @@ static void tlp_write_tx(struct altera_pcie *pcie,
 
 static bool altera_pcie_link_is_up(struct altera_pcie *pcie)
 {
-	return !!(cra_readl(pcie, RP_LTSSM) & LTSSM_L0);
+	return !!((cra_readl(pcie, RP_LTSSM) & RP_LTSSM_MASK) == LTSSM_L0);
 }
 
 static bool altera_pcie_valid_config(struct altera_pcie *pcie,
-- 
2.2.0