From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>
Date: Mon, 28 Aug 2017 16:48:29 +0000
Subject: [U-Boot] FSL PCIe LTSSM >= PCI_LTSSM_L0 equals link up
Message-ID: <1503938907.4350.28.camel@infinera.com>
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To: u-boot@lists.denx.de

FSL PCIe controller drivers before REV 3 has this test for link up: 
  enabled = ltssm >= PCI_LTSSM_L0;

We have a PCIe dev. that stays in LTSSM=0x51 (Polling Compliance) when non ready
for PCI transaktions. When FSL PCIe controller tries to access this device, it
hangs forever.

Is LTSSM=0x51 really a "legal" state for link up?
If not, what is a suitable range(maybe LO <= ltssm <= L0s(0x27)) ?

 Jocke

BTW, the same test is valid in Linux too.