lkml.org 
[lkml]   [2016]   [Mar]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] PCI: altera: fix altera_pcie_link_is_up()
Date
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@altera.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
\
 
 \ /
  Last update: 2016-03-02 11:41    [W:0.056 / U:0.096 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site